texlive[46378] trunk: latexmk (18jan18)

commits+karl at tug.org commits+karl at tug.org
Fri Jan 19 00:25:58 CET 2018


Revision: 46378
          http://tug.org/svn/texlive?view=revision&revision=46378
Author:   karl
Date:     2018-01-19 00:25:58 +0100 (Fri, 19 Jan 2018)
Log Message:
-----------
latexmk (18jan18)

Modified Paths:
--------------
    trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl
    trunk/Master/texmf-dist/doc/man/man1/latexmk.1
    trunk/Master/texmf-dist/doc/man/man1/latexmk.man1.pdf
    trunk/Master/texmf-dist/doc/support/latexmk/CHANGES
    trunk/Master/texmf-dist/doc/support/latexmk/INSTALL
    trunk/Master/texmf-dist/doc/support/latexmk/README
    trunk/Master/texmf-dist/doc/support/latexmk/latexmk.pdf
    trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt
    trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl

Modified: trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl
===================================================================
--- trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Build/source/texk/texlive/linked_scripts/latexmk/latexmk.pl	2018-01-18 23:25:58 UTC (rev 46378)
@@ -121,8 +121,8 @@
 
 $my_name = 'latexmk';
 $My_name = 'Latexmk';
-$version_num = '4.54c';
-$version_details = "$My_name, John Collins, 12 Dec. 2017";
+$version_num = '4.55';
+$version_details = "$My_name, John Collins, 17 Jan. 2018";
 
 use Config;
 use File::Basename;
@@ -183,7 +183,7 @@
    warn "Something wrong with the perl configuration: No signals?\n";
 }
 
-## Copyright John Collins 1998-2017
+## Copyright John Collins 1998-2018
 ##           (username jcc8 at node psu.edu)
 ##      (and thanks to David Coppit (username david at node coppit.org) 
 ##           for suggestions) 
@@ -221,107 +221,21 @@
 ##
 ##   12 Jan 2012 STILL NEED TO DOCUMENT some items below
 ##
+##    17 Jan 2018   John Collins  Version number to 4.55.  Ready for release.
+##    15, 16 Jan 2018   John Collins  Correct bug in measuring filetime offset.
+##    14 Jan 2018   John Collins  Correct issue with possible filetime offset
+##                                  on remote file system.
+##                                Define defaults for configuration variables
+##                                  that didn't have defaults.
+##    12 Jan 2018   John Collins  Implement pvc timeout
+##    10 Jan 2018   John Collins  Ensure $search_path_separator is defined.
+##                                Set it to MS-Win value for msys.
 ##    12 Dec 2017   John Collins  Further correct bsd_glob fudge (to be in subroutine my_glob)
 ##     8 Dec 2017   John Collins  Correct bsd_glob fudge
 ##     2 Dec 2017   John Collins  Fudge on bsd_glob if it doesn't exist
 ##    20 Nov 2017   John Collins  Ver. 4.54
-##    18 Nov 2017   John Collins  Add item to @file_not_found for generic
-##                                  package warning about "No file", as produced
-##                                  by glossaries-extra.
-##                                In run_bibtex, make change in environment
-##                                  be local, not global.
-##     4 Sep 2017   John Collins  Restore default of $analyze_input_log_always 
-##                                  to 1.  This restores the default detection
-##                                  of certain constructs for dependencies for
-##                                  input files in the .log file. See the
-##                                  comments on this variable.  This corrects
-##                                  a problem caused by a change in the
-##                                  behavior of lualatex in TeXLive 2017.
-##     2 Sep 2017   John Collins  Remove insertion of name of deps file in
-##                                  list of targets in deps file.
-##                                Don't print deps info in deps mode (unless
-##                                  diagnostics on).
-##     1 Sep 2017   John Collins  Customized default previewers for MSys
-##    14 Jul 2017   John Collins  Correct collection of timing information so 
-##                                  that it works even in silent mode
-##    14 Jun 2017   John Collins  Extra value for $bibtex_use
-##    12 Jun 2017   John Collins  Change glob to bsd_glob, since
-##                                  File::Glob's glob is now deprecated.
-##                                Remove unused glob_list.
-##    16 May 2017   John Collins  Optimize away current directory string in
-##                                  $out_dir and $aux_dir.
-##    15 May 2017   John Collins  Fix incorrect deletion of non-generated
-##                                   aux files.
-##    13 May 2017   John Collins  Correct ordering of list of options given
-##                                  by -help
-##     6 Apr 2017   John Collins  In deps_list, correct bug in identifying
-##                                generated files.  Otherwise, generated files
-##                                may be identified as true source files.
-##    19 Jan 2017   John Collins  Make -jobname work with -pdfxe and -pdflua
-##    18 Jan 2017   John Collins  Update to v. 4.53.
-##    17 Jan 2017   John Collins  Update to v. 4.52b (official release).
-##                                Fix bbl file detection bug.
-##                                Bbl files were previously only identified
-##                                  from occurrence as input files in log
-##                                  file rather than from fls as well.
-##    16 Jan 2017   John Collins  Clean up
-##                                Add extra item to @file_not_found for
-##                                  xelatex's characteristic message.
-##    14 Jan 2017   John Collins  Fix some diagnostics.
-##                                Detect graphics candidates in log file from
-##                                  <...> constructs.
-##                                Don't look in log file for input files in the
-##                                  (...) and <...> constructs unless forced to
-##                                  by lack of up-to-date fls file.
-##    13 Jan 2017   John Collins  Kpsewhich diagnostics: also if not
-##                                  silent, or when $kpsewhich_show set.
-##                                Optimize calls to kpsewhich to find files
-##                                  given by lines put in log file by
-##                                  graphics package.
-##                                Work around LuaTeX line-wrapping bug.  (LuaTeX 0.95.0)
-##    12 Jan 2017   John Collins  Improve error reporting on failed run.
-##    11 Jan 2017   John Collins  With -diagnositcs, include invocation
-##                                  and results for kpsewhich.
-##     4, 10 Jan 2017  John Collins  Finish fix for read-after-write files
-##     29-31 Dec 2016  John Collins  V. 4.51
-##                                For biber and bibtex rules, included .blg
-##                                   file as extra generated file.
-##                                Similarly for makeindex rule
-##      3 Nov 2016  John Collins  Start to fix problem reported by jfbu
-##                                that with deleted aux file, latexmk
-##                                does too few runs.
-##                                Problems:
-##                                  1. latexmk doesn't create initial
-##                                     dummy aux or fdb when only one
-##                                     fails to exist, but only when
-##                                     both fail to exist.
-##                                  2. latexmk detects the aux file as
-##                                     only read after write, and
-##                                     hence not a true dependent.
-##                                     That is the initial attempt to
-##                                     read, giving a No file message,
-##                                     is not recorded in the fls
-##                                     file.
-##                                First fix: missing aux file => make
-##                                dummy.
-##                                Need better: if source file in fdb
-##                                doesn't exist initially, then it
-##                                should be counted as initially
-##                                read, so not read after write.
-##     18 Oct 2016  John Collins  xelatex support via xdv file for speed.
-##                                lualatex
-##      5 Sep 2016  John Collins  Add routines: rdb_list_source, rdb_set_source
-##     17 Aug 2016  John Collins  Add XDG Base Directory compatibility
-##                                   for per-user rc file
-##      1 May 2016  John Collins  Correct creation of output and aux directories
-##                                to correctly handle relative paths when -cd
-##                                is used.
-##     22 Apr 2016  John Collins  Fix problem of -C not always working correctly
-##                                when compilation was with -pdf and clear was default.
-##                                (Correctly default set of rules in rdb_make_rule_list.)
-##                                Ver. 4.45
 ##
-##   1998-2010, John Collins.  Many improvements and fixes.
+##   1998-2017, John Collins.  Many improvements and fixes.
 ##       See CHANGE-log.txt for full list, and CHANGES for summary
 ##
 ##   Modified by Evan McLean (no longer available for support)
@@ -664,9 +578,8 @@
 ## Current tex's treat extensions like UNIX teTeX:
 $extension_treatment = 'unix';
 
-## Substitute backslashes in file and directory names for
-##  MSWin command line
-$MSWin_back_slash = 1;
+# Viewers.  These are system dependent, so default to none:
+$pdf_previewer = $ps_previewer  = $ps_previewer_landscape  = $dvi_previewer  = $dvi_previewer_landscape = "NONE";
 
 $dvi_update_signal = undef;
 $ps_update_signal = undef;
@@ -682,6 +595,23 @@
                             # If 0, only open a new viewer if no previous
                             #     viewer for the same file is detected.
 
+# Commands for printing are highly system dependent, so default to NONE:
+$lpr = 'NONE $lpr variable is not configured to allow printing of ps files';
+$lpr_dvi = 'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
+$lpr_pdf = 'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
+
+
+# The $pscmd below holds a **system-dependent** command to list running
+# processes.  It is used to find the process ID of the viewer looking at
+# the current output file.  The output of the command must include the
+# process number and the command line of the processes, since the
+# relevant process is identified by the name of file to be viewed.
+# Its use is not essential.
+$pscmd =  'NONE $pscmd variable is not configured to detect running processes';
+$pid_position = -1;     # offset of PID in output of pscmd.  
+                        # Negative means I cannot use ps
+
+
 $quote_filenames = 1;       # Quote filenames in external commands
 
 $del_dir = '';        # Directory into which cleaned up files are to be put.
@@ -729,7 +659,56 @@
                         #   back to a command prompt, while latexmk
                         #   keeps running in the background!
 
+## Substitute backslashes in file and directory names for
+##  MSWin command line
+$MSWin_back_slash = 1;
 
+## Separator of elements in search_path.  Default is unix value
+$search_path_separator = ':'; 
+
+
+# Directory for temporary files.  Default to current directory.
+$tmpdir = ".";
+
+
+# When the aux_dir is on a network share (or the like), its system
+# time may differ from the system time on which latexmk is running.
+# This complicates the tests of whether particular files have been
+# made in a current run of a program or are left over from a previous
+# run.  One test, which is needed under some situations, is that a
+# file was made on a previous run when the files modification time is
+# less than the system time when the program is started.  (See
+# subroutine test_gen_file; this is only needed in a couple of
+# situations.)  The comparison between file and system times must be
+# corrected if there is an offset between system times on the computer
+# running latexmk and the computer hosting the file system containing
+# aux_dir.  The offset is measured in subroutine get_filetime_offset
+# by writing a temporary file; the test only needs to be done once.
+#
+# The following variables are used.  Since the system-independent
+# values of system and file time are only accurate to a second (or 2
+# seconds for FAT file systems), the offset is also accurate only to a
+# second or two.  So thresholds are needed below which differences
+# are insignificant.
+#
+# Note that the making or not making of a file is controlled by the
+# state of the document being compiled and by latexmk's configuration.
+# So a file that is left over from a previous run and not overwritten
+# on the current run will have a file time at least many seconds less
+# than the current time, corresponding to the time scale for a human
+# run-edit-run cycle.
+#
+$filetime_offset_measured = 0;       # Measurement not yet done.
+$filetime_offset = 0;                # Filetime relative to system time.
+$filetime_causality_threshold = 5;   # Threshold for detection of left-over file.
+                                     # Should be non-negative always, and should
+                                     # be bigger than 2 secs if a remote
+                                     # filesystem or network share is used.
+$filetime_offset_report_threshold = 30; # Threshold beyond which filetime offsets
+                                     # are reported; large offsets indicate
+                                     # incorrect system time on at least one system.
+
+
 ################################################################
 
 
@@ -778,23 +757,6 @@
     $dvi_update_method = 1;
     $ps_update_method = 1;
     $pdf_update_method = 3; # acroread locks the pdf file
-    # Use NONE as flag that I am not implementing some commands:
-    $lpr =
-        'NONE $lpr variable is not configured to allow printing of ps files';
-    $lpr_dvi =
-        'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
-    $lpr_pdf =
-        'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
-    # The $pscmd below holds a command to list running processes.  It
-    # is used to find the process ID of the viewer looking at the
-    # current output file.  The output of the command must include the
-    # process number and the command line of the processes, since the
-    # relevant process is identified by the name of file to be viewed.
-    # Its use is not essential.
-    $pscmd = 
-        'NONE $pscmd variable is not configured to detect running processes';
-    $pid_position = -1;     # offset of PID in output of pscmd.  
-                            # Negative means I cannot use ps
 }
 elsif ( $^O eq "cygwin" ) {
     # The problem is a mixed MSWin32 and UNIX environment. 
@@ -893,34 +855,11 @@
     $dvi_update_method = 1;
     $ps_update_method = 1;
     $pdf_update_method = 3; # acroread locks the pdf file
-    # Use NONE as flag that I am not implementing some commands:
-    $lpr =
-        'NONE $lpr variable is not configured to allow printing of ps files';
-    $lpr_dvi =
-        'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
-    $lpr_pdf =
-        'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
-    # The $pscmd below holds a command to list running processes.  It
-    # is used to find the process ID of the viewer looking at the
-    # current output file.  The output of the command must include the
-    # process number and the command line of the processes, since the
-    # relevant process is identified by the name of file to be viewed.
-    # Its use is not essential.
-    # When the OS is detected as cygwin, there are two possibilities:
-    #    a.  Latexmk was run from an NT prompt, but cygwin is in the
-    #        path. Then the cygwin ps command will not see commands
-    #        started from latexmk.  So we cannot use it.
-    #    b.  Latexmk was started within a cygwin environment.  Then
-    #        the ps command works as we need.
-    # Only the user, not latemk knows which, so we default to not
-    # using the ps command.  The user can override this in a
-    # configuration file. 
-    $pscmd = 
-        'NONE $pscmd variable is not configured to detect running processes';
-    $pid_position = -1;     # offset of PID in output of pscmd.  
-                            # Negative means I cannot use ps
 }
 elsif ( $^O eq "msys" ) {
+    $search_path_separator = ';';  # Separator of elements in search_path
+                                   # I think MS-Win value is OK, since
+                                   # msys is running under MS-Win
     $pdf_previewer = q[sh -c 'start %S'];
     $ps_previewer = q[sh -c 'start %S'];
     $dvi_previewer = q[sh -c 'start %S'];
@@ -929,10 +868,8 @@
 }
 else {
     # Assume anything else is UNIX or clone
+    # Do special cases (e.g., linux, darwin (i.e., OS-X)) inside this block.
 
-    ## Configuration parameters:
-
-
     ## Use first existing case for $tmpdir:
     $tmpdir = $ENV{TMPDIR} || '/tmp';
 
@@ -1227,6 +1164,10 @@
 $preview_continuous_mode  = 0;
 $printout_mode = 0;     # Don't print the file
 
+## Control pvc inactivity timeout:
+$pvc_timeout = 0;
+$pvc_timeout_mins = 30;
+
 $show_time = 0;
 @timings = ();
 $processing_time1 = processing_time();
@@ -1726,6 +1667,9 @@
                        $printout_mode = 0; 
                      }
   elsif (/^-pvc-$/)  { $preview_continuous_mode = 0; }
+  elsif (/^-pvctimeout$/) { $pvc_timeout = 1; }
+  elsif (/^-pvctimeout-$/) { $pvc_timeout = 0; }
+  elsif (/^-pvctimeoutmins=(.*)$/) { $pvc_timeout_mins = $1; }
   elsif (/^-recorder$/ ){ $recorder = 1; }
   elsif (/^-recorder-$/ ){ $recorder = 0; }
   elsif (/^-rules$/ ) { $rules_list = 1; }
@@ -2134,6 +2078,13 @@
     add_option( "$dvips_pdf_switch", \$dvips );
 }
 
+# Restrict variables to allowed values:
+
+if ($filetime_causality_threshold < 0) {
+    warn "$My_name: Correcting negative value of \$filetime_causality_threshold to zero.\n";
+    $filetime_causality_threshold = 0;
+}
+
 # Note sleep has granularity of 1 second.
 # Sleep periods 0 < $sleep_time < 1 give zero delay,
 #    which is probably not what the user intended.
@@ -3143,6 +3094,8 @@
 
     # Loop forever, rebuilding .dvi and .ps as necessary.
     # Set $first_time to flag first run (to save unnecessary diagnostics)
+    my $last_action_time = time();
+    my $timed_out = 0;
 CHANGE:
     for (my $first_time = 1; 1; $first_time = 0 ) {
         my %rules_to_watch = %requested_filerules;
@@ -3258,6 +3211,7 @@
 #          latexmk -pvc foo; cleanup;
         &catch_break;
         $have_break = 0;
+        $last_action_time = time();
   WAIT: while (1) {
            sleep( $sleep_time );
            if ($have_break) { last WAIT; }
@@ -3278,6 +3232,10 @@
                last WAIT; 
            }
            if ($have_break) { last WAIT; }
+           if ($pvc_timeout && ( time() > $last_action_time+60*$pvc_timeout_mins ) ) {
+	       $timed_out = 1;
+	       last WAIT;
+           }
      } # end WAIT:
      &default_break;
      if ($have_break) { 
@@ -3284,6 +3242,10 @@
           print "$My_name: User typed ctrl/C or ctrl/break.  I'll finish.\n";
           return;
      }
+     if ($timed_out) {
+         print "$My_name: More than $pvc_timeout_mins mins of inactivity.  I'll finish.\n";
+         return;
+     }
      $waiting = 0; if ($diagnostics) { warn "NOT       WAITING\n"; }
   } #end infinite_loop CHANGE:
 } #END sub make_preview_continuous
@@ -3585,6 +3547,9 @@
   "                on force mode, so errors do not cause $my_name to stop.)\n",
   "            (Side effect: turn off ordinary preview mode.)\n",
   "   -pvc-  - turn off -pvc\n",
+  "   -pvctimeout    - timeout in pvc mode after period of inactivity\n",
+  "   -pvctimeout-   - don't timeout in pvc mode after inactivity\n",
+  "   -pvctimeoutmins=<time> - set period of inactivity (minutes) for pvc timeout\n",
   "   -quiet    - silence progress messages from called programs\n",
   "   -r <file> - Read custom RC file\n",
   "               (N.B. This file could override options specified earlier\n",
@@ -5750,17 +5715,21 @@
 sub test_gen_file {
     # Usage: test_gen_file( filename )
     # Tests whether the file was generated during a run of (pdf)latex.
-    # Used by rdb_set_latex_deps.
-    # Assumes context for primary rule, and that %generated_log is set.
-    # The generated_log test works with TeXLive's tex, because it puts
-    #   \openout lines in log file.
-    # But it doesn't work with MikTeX, which does NOT put \openout lines
-    #   in log file.
-    # So we have a back up test: bcf file exists and is at least as new as
-    #   the run time (so it should have been generated on the current run).
+    # Assumes context for primary rule.
+    # Two kinds of test are used:
+    # a. From %generated_log, which works after the log file has been parsed,
+    #    but only for certain files and for those TeX engines (not MiKTeX)
+    #    that put \openout lines in log file.
+    # b. By the file existing and being at least as new as the system
+    #    time at the start of the run. But we allow for a measured
+    #    offset between filetime and system time, which could be
+    #    nonzero if the file is on a different, remote system than the
+    #    one running latexmk. We must also allow a threshold in the
+    #    comparisons of filetimes to allow for the inaccuracy of the
+    #    offset measurement.
     my $file = shift;
     return exists $generated_log{$file}
-           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time ));
+           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time + $filetime_offset - $filetime_causality_threshold));
 }
 
 #************************************************************
@@ -6785,7 +6754,7 @@
     # Source file data, by definition, correspond to the file state just
     # before the latest run, and the run_time to the time just before the run:
     &rdb_update_files;
-    $$Prun_time = time;
+    $$Prun_time = time();
     $$Pchanged = 0;       # No special changes in files
     $$Plast_result = 0;
     $$Plast_message = '';
@@ -6959,7 +6928,7 @@
     # Source file data, by definition, correspond to the file state just before 
     # the latest run, and the run_time to the time just before the run:
     &rdb_update_files;
-    $$Prun_time = time;
+    $$Prun_time = time();
     $$Pchanged = 0;       # No special changes in files
     $$Plast_result = 0;
     $$Plast_message = '';
@@ -7056,6 +7025,17 @@
     # and then parses log file etc.
     my $return = 0;
 
+    if ( ! $filetime_offset_measured ) {
+	$filetime_offset = get_filetime_offset( $aux_dir1."tmp" );
+	if ( (abs($filetime_offset) > $filetime_offset_report_threshold)
+             && ($diagnostics || ! $silent) )
+        {
+	    warn "$My_name: I am working around an offset relative to my system time by\n",
+                 "   $filetime_offset secs for file times in directory '$aux_dir1'.\n";
+	}
+	$filetime_offset_measured = 1;
+    }
+
     my $return_latex = &rdb_run1;
     if (-e $$Pdest) { $missing_dvi_pdf = '';}
 
@@ -7186,7 +7166,7 @@
     local $ignore_run_time = $_[0];
     if ( ! defined $ignore_run_time ) { $ignore_run_time = 0; }
 
-    $$Pcheck_time = time;
+    $$Pcheck_time = time();
 
     local $dest_mtime = 0;
     $dest_mtime = get_mtime($$Pdest) if ($$Pdest);
@@ -8566,10 +8546,39 @@
 
 #################################
 
+sub get_filetime_offset {
+    # Usage: get_filetime_offset( prefix, [suffix] )
+    # Measures offset between filetime in a directory and system time
+    # Makes a temporary file of a unique name, and deletes in.
+    # Filename is of form concatenation of prefix, an integer, suffix.
+    # Prefix is normally of form dir/ or dir/tmp.
+    # Default default suffix ".tmp".
+    my $prefix = $_[0];
+    my $suffix = $_[1] || '.tmp';
+    my $tmp_file_count = 0;
+    while (1==1) {
+        # Find a new temporary file, and make it.
+        $tmp_file_count++;
+        my $tmp_file = "${prefix}${tmp_file_count}${suffix}";
+        if ( ! -e $tmp_file ) {
+            open( TMP, ">$tmp_file" ) 
+		or die "$My_name.get_filetime_offset: In measuring filetime offset, couldn't write to\n",
+ 		       "    temporary file '$tmp_file'\n";
+	    my $time = time();
+            close(TMP);
+	    my $offset = get_mtime($tmp_file) - $time;
+	    unlink $tmp_file;
+            return $offset;
+         }
+     }
+     die "$My_name.get_filetime_offset: BUG TO ARRIVE HERE\n";
+}
 
+#################################
+
 sub tempfile1 {
     # Makes a temporary file of a unique name.  I could use file::temp,
-    # but it is not present in all versions of perl
+    # but it is not present in all versions of perl.
     # Filename is of form $tmpdir/$_[0]nnn$suffix, where nnn is an integer
     my $tmp_file_count = 0;
     my $prefix = $_[0];

Modified: trunk/Master/texmf-dist/doc/man/man1/latexmk.1
===================================================================
--- trunk/Master/texmf-dist/doc/man/man1/latexmk.1	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/doc/man/man1/latexmk.1	2018-01-18 23:25:58 UTC (rev 46378)
@@ -1,4 +1,4 @@
-.TH LATEXMK 1 "12 December 2017" ""
+.TH LATEXMK 1 "17 January 2018" ""
 .SH NAME
 latexmk \- generate LaTeX document
 .SH SYNOPSIS
@@ -847,6 +847,21 @@
 Turn off \fB-pvc\fR.
 
 .TP
+.B -pvctimeout
+Do timeout in pvc mode after period of inactivity, which is 30 min. by
+default.  Inactivity means a period when \fIlatexmk\fR has detected no
+file changes and hence has not taken any actions like compiling the
+document. 
+
+.TP
+.B -pvctimeout-
+Don't do timeout in pvc mode after inactivity.
+
+.TP
+.B -pvctimeoutmins=<time>
+Set period of inactivity in \fIminutes\fR for pvc timeout.
+
+.TP
 .B -quiet
 Same as -silent
 
@@ -1550,7 +1565,7 @@
 \fI$banner_message\fR, this is equivalent to specifying the \fB-d\fR
 option.
 
-Note that if \fB$banner\fR is nonzero, the \fB$postscript_mode\fR is
+Note that if \fI$banner\fR is nonzero, the \fI$postscript_mode\fR is
 assumed and the postscript file is always generated, even if it is newer
 than the dvi file.
 .TP
@@ -1918,6 +1933,59 @@
 database of information on source files.  You will not normally need
 to change this.
 .TP
+.B $filetime_causality_threshold [5]; $filetime_offset_report_threshold [30]. \fR(Units of seconds.)
+
+These variables control how \fIlatexmk\fR deals with the following
+issue, which can affect the use of files that are on a remote
+filesystem (network share) instead of being on a file system local to
+the computer running \fIlatexmk\fR.  Almost users will not have to
+worry about these settings, and can ignore the following explanation.
+
+In almost all situations, \fIlatexmk\fR does not need to use the time
+stamps of the files it works with.  However, there are a couple of
+situations when it needs to know whether a certain file was created in
+the current run of a program (e.g., \fI(pdf)latex\fR) or is a leftover
+file from a previous run. It does this by comparing the modification
+time of the file with the system time just before the program was
+started. If the modification time is earlier than when the program was
+started, the file is a leftover file, which \fIlatexmk\fR treats as if
+it were not created.  If the filetime is at least the program start
+time, then it can be assumed that the file was created in the current
+run.
+
+Unfortunately, this test can fail if the file is on a remote system,
+since its system time is not necessarily synchronized with that of the
+local system; the timestamps on the remote files are set by the remote
+system, not the local system.  Generally, modern operating systems
+regularly synchronize their time with a server, so the
+non-synchronization is mostly small (a second or so, or a few
+seconds).  But even a small difference can mess up \fIlatexmk\fR's
+test.
+
+\fILatexmk\fR measures the time difference between the time on the two
+systems and compensates for this.  But the measurement (in a
+system-independent way) is only accurate to a second or two.  So
+\fIlatexmk\fR allows for a threshold on the difference between file
+and system time before it concludes that a file is a leftover file
+from a previous run. The configuration variable
+\fI$filetime_causality_theshhold\fR, which in units of seconds,
+specifies this threshold.  Luckily high precision is not needed.  The
+previous run is normally the previous run in a human run-edit-run
+cycle, and is at least many seconds back.  A few seconds is therefore
+appropriate for the threshold, \fI$filetime_causality_theshhold\fR; it
+should be non-negative always, and should be bigger than 2 if a remote
+filesystem or network share is used.
+
+If the difference in system times on the two systems is large, it
+normally indicates that at least one of the systems is misconfigured.
+The variable \fI$filetime_offset_report_threshold\fR specifies the
+smallest size of the difference (or offset) in seconds between the
+times of the local and remote system beyond which the offset is
+reported.  This is reported at the point in the \fIlatexmk\fR's
+progress that it measures the offset. The report is made if silent
+mode is used and diagnostic mode is not on.
+
+.TP
 .B $force_mode [0]
 If nonzero, continue processing past minor \fIlatex\fR errors 
 including unrecognized cross references.  Equivalent to specifying the
@@ -2079,7 +2147,7 @@
 dependency for \fIlatexmk\fR, and should also have done the appropriate
 programming in the LaTeX source file to enable the file to be read.
 The standard extensions are handled by LaTeX and its graphics/graphicx
-packages. 
+packages.)
 .TP
 .B $latex_silent_switch ["-interaction=batchmode"]
 Switch(es) for the LaTeX processing program when silent mode is on.
@@ -2460,6 +2528,18 @@
 updated by sending a signal -- see \fI$ps_update_method\fR.  The
 default value is the one appropriate for gv on a UNIX system.
 .TP
+.B $pvc_timeout [0]
+If this variable is nonzero, there will be a  timeout in pvc mode
+after a period of inactivity.  Inactivity means a period when
+\fIlatexmk\fR has detected no file changes and hence has not taken any
+actions like compiling the document. The period of inactivity is in
+the variable $pvc_timeout_mins.
+
+.TP
+.B $pvc_timeout_mins [30]
+The period of inactivity, in minutes, after which pvc mode times out.
+This is used if \fI$pvc_timeout\fR is nonzero.
+.TP
 .B $pvc_view_file_via_temporary [1]
 The same as \fI$always_view_file_via_temporary\fR, except that it only
 applies in preview-continuous mode (-pvc option).
@@ -2644,7 +2724,7 @@
 
 .SS Defining a custom dependency:
 The old method of configuring \fIlatexmk\fR to use a custom dependency
-was to directly manipulate the \fB at cus_dep_list\fR array that contains
+was to directly manipulate the \fI at cus_dep_list\fR array that contains
 information defining the custom dependencies.  (See the section "Old Method of
 Defining Custom Dependencies" for details.) This method still
 works, but is no longer preferred.  
@@ -2874,7 +2954,7 @@
     }
     push @generated_exts, 'ndx', 'nnd', 'adx', 'and';
 
-This last example uses the command specification in \fB$makeindex\fR,
+This last example uses the command specification in \fI$makeindex\fR,
 and so any customization you have made for the standard index also
 applies to your extra indexes.
 
@@ -2897,7 +2977,7 @@
 .SS Old Method of Defining Custom Dependencies:
 In much older versions of \fIlatexmk\fR, the only method of defining
 custom dependencies was to directly manipulate the table of custom
-dependencies.  This is contained in the \fB at cus_dep_list\fR array.  It
+dependencies.  This is contained in the \fI at cus_dep_list\fR array.  It
 is an array of strings, and each string in the array has four items in
 it, each separated by a space, the from-extension, the to-extension,
 the "must" item, and the name of the subroutine for the custom
@@ -2968,7 +3048,7 @@
 among the dependencies that \fIlatexmk\fR should know, but its default
 methods don't find the dependency. Almost always the first argument is
 the name of the rule currently being processed, so it is then
-appropriate to specify it by \fB$rule\fR.
+appropriate to specify it by \fI$rule\fR.
 
 For examples of its use, see some of the files in the directory
 \fIexample_rcfiles\fR of \fIlatexmk\fR's distribution.  Currently the
@@ -3169,7 +3249,7 @@
 harvested too easily.)
 .SH AUTHOR
 Current version, by John Collins (username jcc8 at node psu.edu).
-(Version 4.54c).
+(Version 4.55).
 
 Released version can be obtained from CTAN:
 <http://www.ctan.org/pkg/latexmk/>, and from the

Modified: trunk/Master/texmf-dist/doc/man/man1/latexmk.man1.pdf
===================================================================
(Binary files differ)

Modified: trunk/Master/texmf-dist/doc/support/latexmk/CHANGES
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/CHANGES	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/doc/support/latexmk/CHANGES	2018-01-18 23:25:58 UTC (rev 46378)
@@ -576,3 +576,18 @@
  Work-around for when bsd_glob is not available on old installations of
    Perl.  (Note that with these old installations, clean-up operations
    may not work when file or directory names contain spaces.)
+
+From v. 4.54c to 4.55
+ Correct bug that $search_path_separator wasn't defined under msys.
+ Ensure that all configuration variables do have sensible default
+   definitions (which wasn't always the case previously).
+ Allow optional timeout in pvc mode after a period of inactivity.
+   (See documentation for -pvctimeout option.)
+ Compensate for problems caused by time offset between system time on
+   system running latexmk and file times on remote file system.
+   (It caused wrong behavior when a document uses biber, MiKTeX
+   is used, the aux_dir is on a remote file system, and the system
+   time on the host of the file system differs from the system time on
+   the system running latexmk.)
+
+ 

Modified: trunk/Master/texmf-dist/doc/support/latexmk/INSTALL
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/INSTALL	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/doc/support/latexmk/INSTALL	2018-01-18 23:25:58 UTC (rev 46378)
@@ -1,6 +1,6 @@
             INSTALLING latexmk
             ==================
-      (Version 4.54c, 12 December 2017)
+      (Version 4.55, 17 January 2018)
 
             John Collins
             Physics Department

Modified: trunk/Master/texmf-dist/doc/support/latexmk/README
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/README	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/doc/support/latexmk/README	2018-01-18 23:25:58 UTC (rev 46378)
@@ -1,5 +1,5 @@
-Latexmk, version 4.54c, 12 December 2017
-----------------------------------------
+Latexmk, version 4.55, 17 January 2018
+--------------------------------------
 
 Latexmk completely automates the process of generating a LaTeX
 document.  Essentially, it is a highly specialized cousin of the
@@ -91,7 +91,7 @@
 
 John Collins
 ---------------------------- "latexmk -h" ----------------------------
-Latexmk 4.54c: Automatic LaTeX document generation routine
+Latexmk 4.55: Automatic LaTeX document generation routine
 
 Usage: latexmk [latexmk_options] [filename ...]
 
@@ -183,6 +183,9 @@
                 on force mode, so errors do not cause latexmk to stop.)
             (Side effect: turn off ordinary preview mode.)
    -pvc-  - turn off -pvc
+   -pvctimeout    - timeout in pvc mode after period of inactivity
+   -pvctimeout-   - don't timeout in pvc mode after inactivity
+   -pvctimeoutmins=<time> - set period of inactivity (minutes) for pvc timeout
    -quiet    - silence progress messages from called programs
    -r <file> - Read custom RC file
                (N.B. This file could override options specified earlier

Modified: trunk/Master/texmf-dist/doc/support/latexmk/latexmk.pdf
===================================================================
(Binary files differ)

Modified: trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt
===================================================================
--- trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/doc/support/latexmk/latexmk.txt	2018-01-18 23:25:58 UTC (rev 46378)
@@ -61,7 +61,7 @@
 
 
 
-                               12 December 2017                              1
+                                17 January 2018                              1
 
 
 
@@ -127,7 +127,7 @@
 
 
 
-                               12 December 2017                              2
+                                17 January 2018                              2
 
 
 
@@ -193,7 +193,7 @@
 
 
 
-                               12 December 2017                              3
+                                17 January 2018                              3
 
 
 
@@ -259,7 +259,7 @@
 
 
 
-                               12 December 2017                              4
+                                17 January 2018                              4
 
 
 
@@ -325,7 +325,7 @@
 
 
 
-                               12 December 2017                              5
+                                17 January 2018                              5
 
 
 
@@ -391,7 +391,7 @@
 
 
 
-                               12 December 2017                              6
+                                17 January 2018                              6
 
 
 
@@ -457,7 +457,7 @@
 
 
 
-                               12 December 2017                              7
+                                17 January 2018                              7
 
 
 
@@ -523,7 +523,7 @@
 
 
 
-                               12 December 2017                              8
+                                17 January 2018                              8
 
 
 
@@ -589,7 +589,7 @@
 
 
 
-                               12 December 2017                              9
+                                17 January 2018                              9
 
 
 
@@ -655,7 +655,7 @@
 
 
 
-                               12 December 2017                             10
+                                17 January 2018                             10
 
 
 
@@ -721,7 +721,7 @@
 
 
 
-                               12 December 2017                             11
+                                17 January 2018                             11
 
 
 
@@ -787,7 +787,7 @@
 
 
 
-                               12 December 2017                             12
+                                17 January 2018                             12
 
 
 
@@ -853,7 +853,7 @@
 
 
 
-                               12 December 2017                             13
+                                17 January 2018                             13
 
 
 
@@ -919,7 +919,7 @@
 
 
 
-                               12 December 2017                             14
+                                17 January 2018                             14
 
 
 
@@ -972,20 +972,20 @@
        -pvc-  Turn off -pvc.
 
 
-       -quiet Same as -silent
+       -pvctimeout
+              Do  timeout  in pvc mode after period of inactivity, which is 30
+              min. by default.  Inactivity means a  period  when  latexmk  has
+              detected  no  file  changes  and hence has not taken any actions
+              like compiling the document.
 
 
-       -r <rcfile>
-              Read  the  specified initialization file ("RC file") before pro-
-              cessing.
+       -pvctimeout-
+              Don't do timeout in pvc mode after inactivity.
 
-              Be careful about the ordering: (1) Standard initialization files
-              --  see  the section below on "Configuration/initialization (RC)
-              files" -- are read first.  (2) Then the options on  the  command
 
 
 
-                               12 December 2017                             15
+                                17 January 2018                             15
 
 
 
@@ -994,30 +994,44 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              line  are acted on in the order they are given.  Therefore if an
-              initialization file is specified by the -r option,  it  is  read
-              during  this second step.  Thus an initialization file specified
+       -pvctimeoutmins=<time>
+              Set period of inactivity in minutes for pvc timeout.
+
+
+       -quiet Same as -silent
+
+
+       -r <rcfile>
+              Read the specified initialization file ("RC file")  before  pro-
+              cessing.
+
+              Be careful about the ordering: (1) Standard initialization files
+              -- see the section below on  "Configuration/initialization  (RC)
+              files"  --  are read first.  (2) Then the options on the command
+              line are acted on in the order they are given.  Therefore if  an
+              initialization  file  is  specified by the -r option, it is read
+              during this second step.  Thus an initialization file  specified
               with the -r option can override both the standard initialization
               files and previously specified options.  But all of these can be
               overridden by later options.
 
               The contents of the RC file just comprise a piece of code in the
-              Perl  programming  language  (typically a sequence of assignment
+              Perl programming language (typically a  sequence  of  assignment
               statements); they are executed when the -r option is encountered
               during latexmk's parsing of its command line.  See the -e option
-              for a way of giving initialization code  directly  on  latexmk's
-              command  line.   An error results in latexmk stopping.  Multiple
-              instances of the -r and -e options can be  used,  and  they  are
+              for  a  way  of giving initialization code directly on latexmk's
+              command line.  An error results in latexmk  stopping.   Multiple
+              instances  of  the  -r  and -e options can be used, and they are
               executed in the order they appear on the command line.
 
 
        -recorder
-              Give  the  -recorder  option with latex and pdflatex.  In (most)
-              modern versions of these programs, this results  in  a  file  of
-              extension  .fls  containing  a list of the files that these pro-
+              Give the -recorder option with latex and  pdflatex.   In  (most)
+              modern  versions  of  these  programs, this results in a file of
+              extension .fls containing a list of the files  that  these  pro-
               grams have read and written.  Latexmk will then use this file to
-              improve  its detection of source files and generated files after
-              a run of latex or pdflatex.  This  is  the  default  setting  of
+              improve its detection of source files and generated files  after
+              a  run  of  latex  or  pdflatex.  This is the default setting of
               latexmk, unless overridden in an initialization file.
 
               For further information, see the documentation for the $recorder
@@ -1032,48 +1046,46 @@
 
 
        -rules-
-              Do not show a list of latexmk's  rules  and  dependencies  after
+              Do  not  show  a  list of latexmk's rules and dependencies after
               processing.  (This is the default.)
 
 
-       -showextraoptions
-              Show  the  list of extra latex and pdflatex options that latexmk
-              recognizes, but that it simply passes through  to  the  programs
-              latex,  pdflatex,  etc   when  they  are run.  These options are
-              (currently) a combination of those allowed by  the  TeXLive  and
-              MiKTeX  implementations.   (If  a  particular option is given to
-              latexmk but is not handled by the particular  implementation  of
-              latex or pdflatex that is being used, that program will probably
-              give an error message.)  These options are  very  numerous,  but
-              are not listed in this documentation because they have no effect
-              on latexmk's actions.
 
+                                17 January 2018                             16
 
 
 
-                               12 December 2017                             16
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       -showextraoptions
+              Show the list of extra latex and pdflatex options  that  latexmk
+              recognizes,  but  that  it simply passes through to the programs
+              latex, pdflatex, etc  when they  are  run.   These  options  are
+              (currently)  a  combination  of those allowed by the TeXLive and
+              MiKTeX implementations.  (If a particular  option  is  given  to
+              latexmk  but  is not handled by the particular implementation of
+              latex or pdflatex that is being used, that program will probably
+              give  an  error  message.)  These options are very numerous, but
+              are not listed in this documentation because they have no effect
+              on latexmk's actions.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-              There are a  few  options  (-includedirectory=dir,  -initialize,
-              -ini)  that  are  not  recognized, either because they don't fit
+              There  are  a  few  options (-includedirectory=dir, -initialize,
+              -ini) that are not recognized, either  because  they  don't  fit
               with latexmk's intended operations, or because they need special
-              processing  by  latexmk  that  isn't  implemented (at least, not
+              processing by latexmk that  isn't  implemented  (at  least,  not
               yet).
 
-              There are also options that  are  accepted  by  latex  etc,  but
+              There  are  also  options  that  are  accepted by latex etc, but
               instead trigger actions by latexmk: -help, -version.
 
               Finally, there are certain options for latex and pdflatex (e.g.,
-              -recorder) that trigger special actions or behavior  by  latexmk
-              itself  as well as being passed in some form to the called latex
-              and pdflatex program, or that affect  other  programs  as  well.
-              These  options  do  have  entries  in this documentation.  These
+              -recorder)  that  trigger special actions or behavior by latexmk
+              itself as well as being passed in some form to the called  latex
+              and  pdflatex  program,  or  that affect other programs as well.
+              These options do have  entries  in  this  documentation.   These
               options are: -jobname=STRING, -aux-directory=dir, -output-direc-
               tory=DIR, -quiet, and -recorder.
 
@@ -1080,22 +1092,22 @@
 
        -silent
               Run commands silently, i.e., with options that reduce the amount
-              of diagnostics generated.  For example, with  the  default  set-
-              tings,  the  command  "latex -interaction=batchmode" is used for
+              of  diagnostics  generated.   For example, with the default set-
+              tings, the command "latex -interaction=batchmode"  is  used  for
               (pdf)latex and friends.
 
-              See  also  the  -logfilewarninglist   and   -logfilewarninglist-
+              See   also   the  -logfilewarninglist  and  -logfilewarninglist-
               options.
 
-              Also  reduce  the  number of informational messages that latexmk
+              Also reduce the number of informational  messages  that  latexmk
               itself generates.
 
-              To change the options used to make the  commands  run  silently,
+              To  change  the  options used to make the commands run silently,
               you need to configure latexmk with changed values of its config-
-              uration   variables,   the    relevant    ones    being    $bib-
-              tex_silent_switch,  $biber_silent_switch, $dvipdf_silent_switch,
-              $dvips_silent_switch,       $latex_silent_switch,        $luala-
-              tex_silent_switch        $makeindex_silent_switch,       $pdfla-
+              uration    variables,    the    relevant    ones   being   $bib-
+              tex_silent_switch, $biber_silent_switch,  $dvipdf_silent_switch,
+              $dvips_silent_switch,        $latex_silent_switch,       $luala-
+              tex_silent_switch       $makeindex_silent_switch,        $pdfla-
               tex_silent_switch, and $xelatex_silent_switch
 
 
@@ -1103,43 +1115,42 @@
               $show_time.
 
 
-       -time- Do  not show CPU time used.  See also the configuration variable
-              $show_time.
 
 
-       -use-make
-              When after a run of latex or pdflatex, there are warnings  about
-              missing files (e.g., as requested by the LaTeX \input, \include,
-              and \includgraphics commands), latexmk tries to make them  by  a
-              custom  dependency.  If  no  relevant  custom dependency with an
-              appropriate source file is found, and if the -use-make option is
-              set,  then  as  a  last  resort latexmk will try to use the make
+                                17 January 2018                             17
 
 
 
-                               12 December 2017                             17
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       -time- Do not show CPU time used.  See also the configuration  variable
+              $show_time.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+       -use-make
+              When  after a run of latex or pdflatex, there are warnings about
+              missing files (e.g., as requested by the LaTeX \input, \include,
+              and  \includgraphics  commands), latexmk tries to make them by a
+              custom dependency. If no  relevant  custom  dependency  with  an
+              appropriate source file is found, and if the -use-make option is
+              set, then as a last resort latexmk will try to use the make pro-
+              gram to try to make the missing files.
 
-              program to try to make the missing files.
-
-              Note that the filename may be specified  without  an  extension,
-              e.g.,  by  \includegraphics{drawing}  in  a LaTeX file.  In that
-              case, latexmk will try making drawing.ext with ext set  in  turn
-              to  the  possible  extensions that are relevant for latex (or as
+              Note  that  the  filename may be specified without an extension,
+              e.g., by \includegraphics{drawing} in a  LaTeX  file.   In  that
+              case,  latexmk  will try making drawing.ext with ext set in turn
+              to the possible extensions that are relevant for  latex  (or  as
               appropriate pdflatex).
 
-              See also the documentation for  the  $use_make_for_missing_files
+              See  also  the documentation for the $use_make_for_missing_files
               configuration variable.
 
 
        -use-make-
-              Do  not  use  the  make  program  to  try to make missing files.
+              Do not use the make  program  to  try  to  make  missing  files.
               (Default.)
 
 
@@ -1156,42 +1167,41 @@
               the -pv or -pvc switches).  The default is to view the "highest"
               kind of requested file (in the low-to-high order dvi, ps, pdf).
 
-              Note the possibility -view=none where no  viewer  is  opened  at
-              all.   One  example  of  is  use is in conjunction with the -pvc
-              option, when you want latexmk to do a compilation  automatically
-              whenever  source  file(s) change, but do not want a previewer to
+              Note  the  possibility  -view=none  where no viewer is opened at
+              all.  One example of is use is  in  conjunction  with  the  -pvc
+              option,  when you want latexmk to do a compilation automatically
+              whenever source file(s) change, but do not want a  previewer  to
               be opened.
 
 
        -xelatex
               Use xelatex.  That is, use xelatex to process the source file(s)
-              to  pdf.   The  generation of dvi and postscript files is turned
+              to pdf.  The generation of dvi and postscript  files  is  turned
               off.
 
               This option is equivalent to using the following set of options
 
-                   -pdfxe -dvi- -ps-
 
-              [Note: Note that the method of implementation  of  this  option,
-              but  not  its  intended primary effect, differ from some earlier
-              versions of latexmk. Latexmk first uses xelatex to make  an  xdv
-              file,  and  does  all  the extra runs needed (including those of
-              bibtex, etc).  Only after that does it make the  pdf  file  from
-              the  xdv  file,  using  xdvipdfmx.  This procedure can result in
-              considerable savings in run time, since the  xdv-to-pdf  conver-
-              sion  is quite time-consuming when large graphics files are used
 
+                                17 January 2018                             18
 
 
-                               12 December 2017                             18
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+                   -pdfxe -dvi- -ps-
 
-
+              [Note:  Note  that  the method of implementation of this option,
+              but not its intended primary effect, differ  from  some  earlier
+              versions  of  latexmk. Latexmk first uses xelatex to make an xdv
+              file, and does all the extra runs  needed  (including  those  of
+              bibtex,  etc).   Only  after that does it make the pdf file from
+              the xdv file, using xdvipdfmx.  This  procedure  can  result  in
+              considerable  savings  in run time, since the xdv-to-pdf conver-
+              sion is quite time-consuming when large graphics files are  used
               in the document.]
 
 
@@ -1198,11 +1208,11 @@
 
        Compatibility between options
 
-       The preview-continuous option -pvc can only work with one file.  So  in
-       this  case  you  will normally only specify one filename on the command
+       The  preview-continuous option -pvc can only work with one file.  So in
+       this case you will normally only specify one filename  on  the  command
        line.
 
-       Options -p, -pv and -pvc are mutually  exclusive.   So  each  of  these
+       Options  -p,  -pv  and  -pvc  are mutually exclusive.  So each of these
        options turns the others off.
 
 
@@ -1230,104 +1240,102 @@
 DEALING WITH ERRORS, PROBLEMS, ETC
        Some possibilities:
 
-       a.  If you get a strange error, do look carefully at the output that is
-       on the screen and in log files.  While there is much  that  is  notori-
+       a. If you get a strange error, do look carefully at the output that  is
+       on  the  screen  and in log files.  While there is much that is notori-
        ously verbose in the output of latex (and that is added to by latexmk),
-       the verbosity is there for a reason: to enable  the  user  to  diagnose
-       problems.   Latexmk  does repeat some messages at the end of a run that
-       it thinks would otherwise be easy to miss in the middle of  other  out-
-       put.
+       the  verbosity  is  there  for a reason: to enable the user to diagnose
+       problems.  Latexmk does repeat some messages at the end of a  run  that
+       it  thinks  would  otherwise  be  easy  to  miss in the middle of other
 
-       b. Generally, remember that latexmk does its work by running other pro-
-       grams.  Your first priority in dealing with errors should be to examine
-       what went wrong with the individual programs.  Then you need to correct
-       the causes of errors in the runs of these programs.  (Often these  come
-       from  errors in the source document, but they could also be about miss-
-       ing LaTeX packages, etc.)
 
-       c. If latexmk doesn't run the programs the way you would like, then you
 
+                                17 January 2018                             19
 
 
-                               12 December 2017                             19
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       output.
 
+       b. Generally, remember that latexmk does its work by running other pro-
+       grams.  Your first priority in dealing with errors should be to examine
+       what went wrong with the individual programs.  Then you need to correct
+       the  causes of errors in the runs of these programs.  (Often these come
+       from errors in the source document, but they could also be about  miss-
+       ing LaTeX packages, etc.)
 
-       need  to look in this documentation at the list of command line options
-       and then at the sections on configuration/initialization files.  A  lot
-       of  latexmk's  behavior  is configurable to deal with particular situa-
+       c. If latexmk doesn't run the programs the way you would like, then you
+       need to look in this documentation at the list of command line  options
+       and  then at the sections on configuration/initialization files.  A lot
+       of latexmk's behavior is configurable to deal  with  particular  situa-
        tions.  (But there is a lot of reading!)
 
-       The remainder of these notes consists of ideas for  dealing  with  more
+       The  remainder  of  these notes consists of ideas for dealing with more
        difficult situations.
 
-       d.  Further  tricks  can  involve  replacing the standard commands that
+       d. Further tricks can involve  replacing  the  standard  commands  that
        latexmk runs by other commands or scripts.
 
-       e. For possible examples of code for use in an RC file, see the  direc-
-       tory   example_rcfiles   in  the  distribution  of  latexmk  (e.g.,  at
+       e.  For possible examples of code for use in an RC file, see the direc-
+       tory  example_rcfiles  in  the  distribution  of  latexmk   (e.g.,   at
        http://mirror.ctan.org/support/latexmk/example_rcfiles).  Even if these
        examples don't do what you want, they may provide suitable inspiration.
 
-       f.  There's  a  useful  trick  that  can  be used when you use lualatex
-       instead of pdflatex (and in some related situations).  The  problem  is
-       that  latexmk won't notice a dependency on a file, bar.baz say, that is
-       input by the lua code in your document instead of by  the  LaTeX  part.
-       (Thus  if you change bar.baz and rerun latexmk, then latexmk will think
-       no files have changed and  not  rerun  lualatex,  whereas  if  you  had
-       '\input{bar.baz}'  in  the  LaTeX  part  of the document, latexmk would
-       notice the change.)  One solution is just to put  the  following  some-
+       f. There's a useful trick that  can  be  used  when  you  use  lualatex
+       instead  of  pdflatex (and in some related situations).  The problem is
+       that latexmk won't notice a dependency on a file, bar.baz say, that  is
+       input  by  the  lua code in your document instead of by the LaTeX part.
+       (Thus if you change bar.baz and rerun latexmk, then latexmk will  think
+       no  files  have  changed  and  not  rerun  lualatex, whereas if you had
+       '\input{bar.baz}' in the LaTeX part  of  the  document,  latexmk  would
+       notice  the  change.)   One solution is just to put the following some-
        where in the LaTeX part of the document:
 
                      \typeout{(bar.baz)}
 
-       This  puts  a  line in the log file that latexmk will treat as implying
-       that the file bar.baz was read.  (At present I  don't  know  a  way  of
-       doing  this  automatically.)   Of  course,  if the file has a different
+       This puts a line in the log file that latexmk will  treat  as  implying
+       that  the  file  bar.baz  was  read.  (At present I don't know a way of
+       doing this automatically.)  Of course, if  the  file  has  a  different
        name, change bar.baz to the name of your file.
 
        g. See also the section ADVANCED CONFIGURATION: Some extra resources.
 
-       h.   Look   on   tex.stackexchange,   i.e.,   at    http://tex.stackex-
-       change.com/questions/tagged/latexmk   Someone  may  have already solved
+       h.    Look   on   tex.stackexchange,   i.e.,   at   http://tex.stackex-
+       change.com/questions/tagged/latexmk  Someone may  have  already  solved
        your problem.
 
        i. Ask a question at tex.stackexchange.com.
 
-       j. Or ask me (the author of latexmk).  My e-mail is at the end of  this
+       j.  Or ask me (the author of latexmk).  My e-mail is at the end of this
        documentation.
 
 
 
-CONFIGURATION/INITIALIZATION (RC) FILES
-       Latexmk can be customized using initialization files, which are read at
-       startup in the following order:
 
-       1) The system RC file, if it exists.
-          On a UNIX system, latexmk searches for following places for its sys-
-       tem RC file, in the following order, and reads the first it finds:
-          "/opt/local/share/latexmk/LatexMk",
+                                17 January 2018                             20
 
 
 
-                               12 December 2017                             20
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+CONFIGURATION/INITIALIZATION (RC) FILES
+       Latexmk can be customized using initialization files, which are read at
+       startup in the following order:
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
+       1) The system RC file, if it exists.
+          On a UNIX system, latexmk searches for following places for its sys-
+       tem RC file, in the following order, and reads the first it finds:
+          "/opt/local/share/latexmk/LatexMk",
           "/usr/local/share/latexmk/LatexMk",
           "/usr/local/lib/latexmk/LatexMk".
           On a MS-Windows system it looks for "C:\latexmk\LatexMk".
-          On  a cygwin system (i.e., a MS-Windows system in which Perl is that
+          On a cygwin system (i.e., a MS-Windows system in which Perl is  that
        of cygwin), latexmk reads the first it finds of
           "/cygdrive/c/latexmk/LatexMk",
           "/opt/local/share/latexmk/LatexMk",
@@ -1338,66 +1346,67 @@
        name replaced "LatexMk" replaced by "latexmkrc".
 
        2) The user's RC file, if it exists.  This can be in one of two places.
-       The traditional one is ".latexmkrc" in the user's home directory.   The
-       other  possibility  is "latexmk/latexmkrc" in the user's XDG configura-
-       tion home directory.  The actual file read is the first  of  "$XDG_CON-
-       FIG_HOME/latexmk/latexmkrc"  or  "$HOME/.latexmkrc" which exists.  (See
+       The  traditional one is ".latexmkrc" in the user's home directory.  The
+       other possibility is "latexmk/latexmkrc" in the user's  XDG  configura-
+       tion  home  directory.  The actual file read is the first of "$XDG_CON-
+       FIG_HOME/latexmk/latexmkrc" or "$HOME/.latexmkrc" which  exists.   (See
        https://specifications.freedesktop.org/basedir-spec/basedir-spec-lat-
        est.html for details on the XDG Base Directory Specification.)
 
-       Here  $HOME  is  the  user's  home  directory.  [Latexmk determines the
-       user's home directory as follows:  It is the value of  the  environment
-       variable  HOME,  if this variable exists, which normally is the case on
-       UNIX-like systems (including Linux and OS-X).  Otherwise  the  environ-
-       ment  variable USERPROFILE is used, if it exists, which normally is the
+       Here $HOME is the  user's  home  directory.   [Latexmk  determines  the
+       user's  home  directory as follows:  It is the value of the environment
+       variable HOME, if this variable exists, which normally is the  case  on
+       UNIX-like  systems  (including Linux and OS-X).  Otherwise the environ-
+       ment variable USERPROFILE is used, if it exists, which normally is  the
        case on MS-Windows systems. Otherwise a blank string is used instead of
        $HOME, in which case latexmk does not look for an RC file in it.]
 
-       $XDG_CONFIG_HOME  is  the  value  of  the environment variable XDG_CON-
-       FIG_HOME if it exists.  If this environment variable  does  not  exist,
-       but  $HOME  is  non-blank,  then $XDG_CONFIG_HOME is set to the default
-       value of  $HOME/.config.   Otherwise  $XDG_CONFIG_HOME  is  blank,  and
+       $XDG_CONFIG_HOME is the value  of  the  environment  variable  XDG_CON-
+       FIG_HOME  if  it  exists.  If this environment variable does not exist,
+       but $HOME is non-blank, then $XDG_CONFIG_HOME is  set  to  the  default
+       value  of  $HOME/.config.   Otherwise  $XDG_CONFIG_HOME  is  blank, and
        latexmk does not look for an RC file under it.
 
 
-       3)  The  RC  file  in  the current working directory.  This file can be
-       named either "latexmkrc" or ".latexmkrc", and the first of these to  be
+       3) The RC file in the current working  directory.   This  file  can  be
+       named  either "latexmkrc" or ".latexmkrc", and the first of these to be
        found is used, if any.
 
        4) Any RC file(s) specified on the command line with the -r option.
 
        Each RC file is a sequence of Perl commands.  Naturally, a user can use
-       this in creative ways.  But  for  most  purposes,  one  simply  uses  a
-       sequence  of  assignment  statements that override some of the built-in
-       settings of Latexmk.  Straightforward  cases  can  be  handled  without
-       knowledge  of  the Perl language by using the examples in this document
-       as templates.  Comment lines are introduced by the "#" character.
+       this  in  creative  ways.   But  for  most  purposes, one simply uses a
+       sequence of assignment statements that override some  of  the  built-in
+       settings  of  Latexmk.   Straightforward  cases  can be handled without
 
-       Note that command line options are obeyed in the order  in  which  they
-       are written; thus any RC file specified on the command line with the -r
-       option can override previous options but can be  itself  overridden  by
-       later  options on the command line.  There is also the -e option, which
-       allows initialization code to be specified in latexmk's command line.
 
 
+                                17 January 2018                             21
 
-                               12 December 2017                             21
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-        For possible examples of code for in an RC  file,  see  the  directory
-       example_rcfiles  in  the  distribution of latexmk (e.g., at http://mir-
+       knowledge of the Perl language by using the examples in  this  document
+       as templates.  Comment lines are introduced by the "#" character.
+
+       Note  that  command  line options are obeyed in the order in which they
+       are written; thus any RC file specified on the command line with the -r
+       option  can  override  previous options but can be itself overridden by
+       later options on the command line.  There is also the -e option,  which
+       allows initialization code to be specified in latexmk's command line.
+
+         For  possible  examples  of code for in an RC file, see the directory
+       example_rcfiles in the distribution of latexmk  (e.g.,  at  http://mir-
        ror.ctan.org/support/latexmk/example_rcfiles).
 
 
 HOW TO SET VARIABLES IN INITIALIZATION FILES
-       The important variables that can be configured  are  described  in  the
-       section  "List  of  configuration  variables  usable  in initialization
+       The  important  variables  that  can be configured are described in the
+       section "List  of  configuration  variables  usable  in  initialization
        files".  Syntax for setting these variables is of the following forms:
 
                            $bibtex = 'bibtex %O %B';
@@ -1410,22 +1419,22 @@
 
                            @default_files = ('paper', 'paper1');
 
-       for the setting of an array of strings.  It is possible  to  append  an
+       for  the  setting  of an array of strings.  It is possible to append an
        item to an array variable as follows:
 
                            push @default_files, 'paper2';
 
-       Note  that  simple  "scalar"  variables  have names that begin with a $
+       Note that simple "scalar" variables have names  that  begin  with  a  $
        character and array variables have names that begin with a @ character.
        Each statement ends with a semicolon.
 
-       Strings  should  be  enclosed  in single quotes.  (You could use double
-       quotes, as in many programming languages.  But then the  Perl  program-
-       ming  language  brings  into  play some special rules for interpolating
-       variables into strings.  People not fluent in Perl will want  to  avoid
+       Strings should be enclosed in single quotes.   (You  could  use  double
+       quotes,  as  in many programming languages.  But then the Perl program-
+       ming language brings into play some  special  rules  for  interpolating
+       variables  into  strings.  People not fluent in Perl will want to avoid
        these complications.)
 
-       You  can do much more complicated things, but for this you will need to
+       You can do much more complicated things, but for this you will need  to
        consult a manual for the Perl programming language.
 
 
@@ -1432,47 +1441,47 @@
 
 
 FORMAT OF COMMAND SPECIFICATIONS
-       Some of the variables set the commands that latexmk uses  for  carrying
-       out  its work, for example to generate a dvi file from a tex file or to
+       Some  of  the variables set the commands that latexmk uses for carrying
+       out its work, for example to generate a dvi file from a tex file or  to
        view a postscript file.  This section describes some important features
-       of  how  the commands are specified.  (Note that some of the possibili-
-       ties listed here do not apply to the $kpsewhich variable; see its docu-
-       mentation.)
 
-       Placeholders:  Supposed you wanted latexmk to use the command elatex in
-       place of the regular latex  command,  and  suppose  moreover  that  you
-       wanted  to  give  it the option "--shell-escape".  You could do this by
-       the following setting:
 
 
+                                17 January 2018                             22
 
 
-                               12 December 2017                             22
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       of how the commands are specified.  (Note that some of  the  possibili-
+       ties listed here do not apply to the $kpsewhich variable; see its docu-
+       mentation.)
 
+       Placeholders:  Supposed you wanted latexmk to use the command elatex in
+       place  of  the  regular  latex  command,  and suppose moreover that you
+       wanted to give it the option "--shell-escape".  You could  do  this  by
+       the following setting:
 
             $latex = 'elatex --shell-escape %O %S';
 
-       The two items starting with the % character  are  placeholders.   These
-       are  substituted by appropriate values before the command is run.  Thus
-       %S will be replaced by the source file that elatex will be applied  to,
-       and  %O will be replaced by any options that latexmk has decided to use
+       The  two  items  starting with the % character are placeholders.  These
+       are substituted by appropriate values before the command is run.   Thus
+       %S  will be replaced by the source file that elatex will be applied to,
+       and %O will be replaced by any options that latexmk has decided to  use
        for this command.  (E.g., if you used the -silent option in the invoca-
-       tion  of  latexmk,   it  results in the replacement of %O by "-interac-
+       tion of latexmk,  it results in the replacement  of  %O  by  "-interac-
        tion=batchmode".)
 
        The available placeholders are:
 
-       %B     base of filename for current command.   E.g.,  if  a  postscript
-              file  document.ps  is being made from the dvi file document.dvi,
+       %B     base  of  filename  for  current command.  E.g., if a postscript
+              file document.ps is being made from the dvi  file  document.dvi,
               then the basename is document.
 
-       %D     destination file (e.g., the name of  the  postscript  file  when
+       %D     destination  file  (e.g.,  the  name of the postscript file when
               converting a dvi file to postscript).
 
        %O     options
@@ -1479,7 +1488,7 @@
 
        %R     root filename.  This is the base name for the main tex file.
 
-       %S     source  file  (e.g.,  the name of the dvi file when converting a
+       %S     source file (e.g., the name of the dvi file  when  converting  a
               dvi file to ps).
 
        %T     The name of the primary tex file.
@@ -1488,126 +1497,125 @@
               tion variable $aux_dir).  A directory separation character ('/')
               is appended if $aux_dir is non-empty and does not end in a suit-
               able character, with suitable characters being those appropriate
-              to UNIX and MS-Windows, i.e., ':', '/' and '\'.   Note  that  if
-              after  initialization,  $out_dir is set, but $aux_dir is not set
-              (i.e., it is blank), then latexmk  sets  $aux_dir  to  the  same
+              to  UNIX  and MS-Windows, i.e., ':', '/' and '\'.   Note that if
+              after initialization,  $out_dir is set, but $aux_dir is not  set
+              (i.e.,  it  is  blank),  then  latexmk sets $aux_dir to the same
               value $out_dir.
 
-       %Z     Name  of directory for output files (see the configuration vari-
-              able $out_dir).   A  directory  separation  character  ('/')  is
+       %Z     Name of directory for output files (see the configuration  vari-
+              able  $out_dir).   A  directory  separation  character  ('/') is
               appended if $out_dir is non-empty and does not end in a suitable
-              character, with suitable characters being those  appropriate  to
+              character,  with  suitable characters being those appropriate to
               UNIX and MS-Windows, i.e., ':', '/' and '\'.
 
-       If  for  some  reason you need a literal % character in your string not
+       If for some reason you need a literal % character in  your  string  not
        subject to the above rules, use "%%".
 
-       Appropriate quoting will be applied to the filename  substitutions,  so
-       you  mustn't  supply them yourself even if the names of your files have
-       spaces in them.  (But if your TeX filenames have spaces in them, beware
-       that many versions of the TeX program cannot correctly handle filenames
-       containing spaces.)  In case latexmk's quoting does not work  correctly
-       on  your  system,  you can turn it off -- see the documentation for the
-       variable $quote_filenames.
 
 
+                                17 January 2018                             23
 
 
-                               12 December 2017                             23
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       Appropriate  quoting  will be applied to the filename substitutions, so
+       you mustn't supply them yourself even if the names of your  files  have
+       spaces in them.  (But if your TeX filenames have spaces in them, beware
+       that many versions of the TeX program cannot correctly handle filenames
+       containing  spaces.)  In case latexmk's quoting does not work correctly
+       on your system, you can turn it off -- see the  documentation  for  the
+       variable $quote_filenames.
 
-
-       The distinction between %B and %R needs a bit of care, since  they  are
-       often  the same, but not always.  For example on a simple document, the
+       The  distinction  between %B and %R needs a bit of care, since they are
+       often the same, but not always.  For example on a simple document,  the
        basename of a bibtex run is the same as for the texfile.  But in a doc-
-       ument  with  several bibliographies, the bibliography files will have a
-       variety of names.  Since bibtex is invoked with  the  basename  of  the
-       bibliography  file, the setting for the bibtex command should therefore
+       ument with several bibliographies, the bibliography files will  have  a
+       variety  of  names.   Since  bibtex is invoked with the basename of the
+       bibliography file, the setting for the bibtex command should  therefore
        be
 
             $bibtex = 'bibtex %O %B';
 
-       Generally, you should use %B rather than %R.  Similarly for  most  pur-
+       Generally,  you  should use %B rather than %R.  Similarly for most pur-
        poses, the name %T of the primary texfile is not a useful placeholder.
 
-       See  the default values in the section "List of configuration variables
+       See the default values in the section "List of configuration  variables
        usable in initialization files" for what is normally the most appropri-
        ate usage.
 
        If you omit to supply any placeholders whatever in the specification of
-       a command, latexmk will supply what its author thinks  are  appropriate
+       a  command,  latexmk will supply what its author thinks are appropriate
        defaults.  This gives compatibility with configuration files for previ-
        ous versions of latexmk, which didn't use placeholders.
 
-       "Detaching" a command: Normally when latexmk runs a command,  it  waits
+       "Detaching"  a  command: Normally when latexmk runs a command, it waits
        for the command to run to completion.  This is appropriate for commands
        like latex, of course.  But for previewers, the command should normally
-       run  detached,  so  that  latexmk  gets  the previewer running and then
+       run detached, so that latexmk  gets  the  previewer  running  and  then
        returns to its next task (or exits if there is nothing else to do).  To
-       achieve  this  effect  of  detaching a command, you need to precede the
+       achieve this effect of detaching a command, you  need  to  precede  the
        command name with "start ", as in
 
             $dvi_previewer = 'start xdvi %O %S';
 
-       This will be translated to whatever is appropriate for  your  operating
+       This  will  be translated to whatever is appropriate for your operating
        system.
 
-       Notes:  (1)  In  some  circumstances, latexmk will always run a command
+       Notes: (1) In some circumstances, latexmk will  always  run  a  command
        detached.  This is the case for a previewer in preview continuous mode,
-       since  otherwise previewing continuously makes no sense.  (2) This pre-
-       cludes the possibility of running a command named start.   (3)  If  the
-       word  start  occurs  more  than  once  at  the beginning of the command
-       string, that is equivalent to having just one.  (4) Under cygwin,  some
-       complications  happen, since cygwin amounts to a complicated merging of
-       UNIX and MS-Windows.  See the source code  for  how  I've  handled  the
+       since otherwise previewing continuously makes no sense.  (2) This  pre-
+       cludes  the  possibility  of running a command named start.  (3) If the
+       word start occurs more than  once  at  the  beginning  of  the  command
+       string,  that is equivalent to having just one.  (4) Under cygwin, some
+       complications happen, since cygwin amounts to a complicated merging  of
+       UNIX  and  MS-Windows.   See  the  source code for how I've handled the
        problem.
 
        Command names containing spaces: Under MS-Windows it is common that the
-       name of a command includes spaces, since software is often installed in
-       a  subdirectory  of  "C:\Program  Files".  Such command names should be
-       enclosed in double quotes, as in
 
-            $lpr_pdf  =  '"c:/Program  Files/Ghostgum/gsview/gsview32.exe"  /p
-       %S';
-            $pdf_previewer   =   'start   "c:/Program   Files/SumatraPDF/Suma-
-       traPDF.exe" %O %S';
 
 
+                                17 January 2018                             24
 
-                               12 December 2017                             24
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-            $pdf_previewer = 'start "c:/Program  Files/SumatraPDF  (x86)/Suma-
+       name of a command includes spaces, since software is often installed in
+       a subdirectory of "C:\Program Files".  Such  command  names  should  be
+       enclosed in double quotes, as in
+
+            $lpr_pdf  =  '"c:/Program  Files/Ghostgum/gsview/gsview32.exe"  /p
+       %S';
+            $pdf_previewer   =   'start   "c:/Program   Files/SumatraPDF/Suma-
        traPDF.exe" %O %S';
+            $pdf_previewer  =  'start "c:/Program Files/SumatraPDF (x86)/Suma-
+       traPDF.exe" %O %S';
 
 
-       (Note  about  the  above  example: Under MS-Windows forward slashes are
+       (Note about the above example: Under  MS-Windows  forward  slashes  are
        equivalent to backslashes in a filename under almost all circumstances,
-       provided  that  the  filename is inside double quotes.  It is easier to
+       provided that the filename is inside double quotes.  It  is  easier  to
        use forward slashes in examples like the one above, since then one does
-       not  have  to worry about the rules for dealing with forward slashes in
+       not have to worry about the rules for dealing with forward  slashes  in
        strings in the Perl language.)
 
-       Command names under Cygwin: If latexmk is executed  by  Cygwin's  Perl,
+       Command  names  under  Cygwin: If latexmk is executed by Cygwin's Perl,
        be particularly certain that pathnames in commands have forward slashes
-       not the usual backslashes for the  separator  of  pathname  components.
-       See  the  above  examples.  Backslashes often get misinterpreted by the
+       not  the  usual  backslashes  for the separator of pathname components.
+       See the above examples.  Backslashes often get  misinterpreted  by  the
        Unix shell used by Cygwin's Perl to execute external commands.  Forward
        slashes don't suffer from this problem, and (when quoted, as above) are
        equally acceptable to MS-Windows.
 
-       Using MS-Windows file associations: A useful trick  under  modern  ver-
+       Using  MS-Windows  file  associations: A useful trick under modern ver-
        sions of MS-Windows (e.g., WinXP) is to use just the command 'start' by
        itself:
 
@@ -1614,9 +1622,9 @@
             $dvi_previewer = 'start %S';
 
        Under MS-Windows, this will cause to be run whatever program the system
-       has  associated  with  dvi  files.   (The same applies for a postscript
+       has associated with dvi files.  (The  same  applies  for  a  postscript
        viewer and a pdf viewer.)  But note that this trick is not always suit-
-       able  for the pdf previwer, if your system has acroread for the default
+       able for the pdf previwer, if your system has acroread for the  default
        pdf viewer.  As explained elsewhere, acroread under MS-Windows does not
        work well with latex and latexmk, because acroread locks the pdf file.
 
@@ -1625,63 +1633,63 @@
 
             $lpr  = 'NONE lpr';
 
-       This typically is used when an appropriate command does  not  exist  on
+       This  typically  is  used when an appropriate command does not exist on
        your system.  The string after the "NONE" is effectively a comment.
 
        Options to commands: Setting the name of a command can be used not only
        for changing the name of the command called, but also to add options to
-       command.   Suppose  you  want latexmk to use latex with source specials
-       enabled.  Then you might use the following line  in  an  initialization
+       command.  Suppose you want latexmk to use latex  with  source  specials
+       enabled.   Then  you  might use the following line in an initialization
        file:
 
-            $latex = 'latex --src-specials %O %S';
 
-       Running  a  subroutine instead of an external command: Use a specifica-
-       tion starting with "internal", as in
 
-            $latex = 'internal mylatex %O %S';
-            sub mylatex {
-                my @args = @_;
 
+                                17 January 2018                             25
 
 
-                               12 December 2017                             25
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+            $latex = 'latex --src-specials %O %S';
 
+       Running a subroutine instead of an external command: Use  a  specifica-
+       tion starting with "internal", as in
 
+            $latex = 'internal mylatex %O %S';
+            sub mylatex {
+                my @args = @_;
                 # Possible preprocessing here
                 return system 'latex', @args;
             }
 
-       For some of the more exotic possibilities that then  become  available,
-       see  the  section  "ADVANCED  CONFIGURATION:  Some  extra resources and
-       advanced tricks". Also see some of the examples in the directory  exam-
+       For  some  of the more exotic possibilities that then become available,
+       see the section  "ADVANCED  CONFIGURATION:  Some  extra  resources  and
+       advanced  tricks". Also see some of the examples in the directory exam-
        ple_rcfiles in the latexmk distribution.
 
-       Advanced  tricks:  Normally one specifies a single command for the com-
-       mands invoked by latexmk.  Naturally,  if  there  is  some  complicated
+       Advanced tricks: Normally one specifies a single command for  the  com-
+       mands  invoked  by  latexmk.   Naturally,  if there is some complicated
        additional processing you need to do in your special situation, you can
        write a script (or batch file) to do the processing, and then configure
        latexmk to use your script in place of the standard program.
 
-       You  can  also  use a Perl subroutine instead of a script -- see above.
+       You can also use a Perl subroutine instead of a script  --  see  above.
        This is generally the most flexible and portable solution.
 
        It is also possible to configure latexmk to run multiple commands.  For
-       example,  if  when  running  pdflatex to generate a pdf file from a tex
-       file you need to run another program after  pdflatex  to  perform  some
+       example, if when running pdflatex to generate a pdf  file  from  a  tex
+       file  you  need  to  run another program after pdflatex to perform some
        extra processing, you could do something like:
 
-            $pdflatex  =  'pdflatex  --shell-escape %O %S; pst2pdf_for_latexmk
+            $pdflatex = 'pdflatex --shell-escape  %O  %S;  pst2pdf_for_latexmk
        %B';
 
-       This definition  assumes  you  are  using  a  UNIX-like  system  (which
-       includes  Linux and OS-X), so that the two commands to be run are sepa-
+       This  definition  assumes  you  are  using  a  UNIX-like  system (which
+       includes Linux and OS-X), so that the two commands to be run are  sepa-
        rated by the semicolon in the middle of the string.
 
        If you are using MS-Windows, you would replace the above line by
@@ -1689,9 +1697,9 @@
           $pdflatex = 'cmd /c pdflatex --shell-escape %O %S'
                       . '&& pst2pdf_for_latexmk %B';
 
-       Here, the UNIX command separator ; is replaced  by  &&.   In  addition,
+       Here,  the  UNIX  command  separator ; is replaced by &&.  In addition,
        there is a problem that some versions of Perl on MS-Windows do not obey
-       the command separator; this problem is overcome by explicitly  invoking
+       the  command separator; this problem is overcome by explicitly invoking
        the MS-Windows command-line processor cmd.exe.
 
 
@@ -1700,32 +1708,32 @@
 
        $always_view_file_via_temporary [0]
               Whether ps and pdf files are initially to be made in a temporary
-              directory and then moved to the final location.   (This  applies
-              to dvips, dvipdf, and ps2pdf operations, and the filtering oper-
-              ators on dvi and ps files.   It  does  not  apply  to  pdflatex,
-              unfortunately,  since  pdflatex  provides no way of specifying a
-              chosen name for the output file.)
 
-              This use of a temporary file solves a problem that the making of
-              these files can occupy a substantial time.  If a viewer (notably
 
 
+                                17 January 2018                             26
 
-                               12 December 2017                             26
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              gv) sees that the file has changed, it may  read  the  new  file
-              before  the  program  writing  the file has not yet finished its
+              directory  and  then moved to the final location.  (This applies
+              to dvips, dvipdf, and ps2pdf operations, and the filtering oper-
+              ators  on  dvi  and  ps  files.   It does not apply to pdflatex,
+              unfortunately, since pdflatex provides no way  of  specifying  a
+              chosen name for the output file.)
+
+              This use of a temporary file solves a problem that the making of
+              these files can occupy a substantial time.  If a viewer (notably
+              gv)  sees  that  the  file has changed, it may read the new file
+              before the program writing the file has  not  yet  finished  its
               work, which  can cause havoc.
 
               See the $pvc_view_file_via_temporary variable for a setting that
-              applies  only  if preview-continuous mode (-pvc option) is used.
+              applies only if preview-continuous mode (-pvc option)  is  used.
               See $tmpdir for the setting of the directory where the temporary
               file is created.
 
@@ -1732,71 +1740,72 @@
 
        $analyze_input_log_always [1]
 
-              After  a run of latex (etc), always analyze .log for input files
-              in the <...> and (...) constructions.  Otherwise,  only  do  the
+              After a run of latex (etc), always analyze .log for input  files
+              in  the  <...>  and (...) constructions.  Otherwise, only do the
               analysis when fls file doesn't exist or is out of date.
 
-              Under  normal  circumstances,  the data in the fls file is reli-
+              Under normal circumstances, the data in the fls  file  is  reli-
               able, and the test of the log file gets lots of false positives;
-              usually  $analyze_input_log_always is best set to zero.  But the
-              test of the log file is needed at least in the following  situa-
-              tion:  When a user needs to persuade latexmk that a certain file
-              is a source file, and latexmk doesn't otherwise find  it.   Then
-              the  user  can  write  code  that causes a line with (...) to be
-              written to log file.  One important case is for lualatex,  which
-              doesn't  always  generate  lines  in the .fls file for input lua
-              files.  (The situation with lualatex is  HIGHLY  version  depen-
-              dent,  e.g.,  there  was  a  big change between TeXLive 2016 and
+              usually $analyze_input_log_always is best set to zero.  But  the
+              test  of the log file is needed at least in the following situa-
+              tion: When a user needs to persuade latexmk that a certain  file
+              is  a  source file, and latexmk doesn't otherwise find it.  Then
+              the user can write code that causes a  line  with  (...)  to  be
+              written  to log file.  One important case is for lualatex, which
+              doesn't always generate lines in the .fls  file  for  input  lua
+              files.   (The  situation  with lualatex is HIGHLY version depen-
+              dent, e.g., there was a big  change  between  TeXLive  2016  and
               TeXLive 2017.)
 
-              To keep backward compatibility with older versions  of  latexmk,
+              To  keep  backward compatibility with older versions of latexmk,
               the default is to set $analyze_input_log_always to 1.
 
 
        $auto_rc_use [1]
-              Whether  to  automatically read the standard initialization (rc)
+              Whether to automatically read the standard  initialization  (rc)
               files, which are the system RC file, the user's RC file, and the
               RC file in the current directory.  The command line option -norc
-              can be used to turn this setting off.  Each RC file  could  also
-              turn  this  setting off, i.e., it could set $auto_rc_use to zero
+              can  be  used to turn this setting off.  Each RC file could also
+              turn this setting off, i.e., it could set $auto_rc_use  to  zero
               to prevent automatic reading of the later RC files.
 
-              This variable does not affect the reading of RC files  specified
+              This  variable does not affect the reading of RC files specified
               on the command line by the -r option.
 
        $aux_dir [""]
               The directory in which auxiliary files (aux, log, etc) are to be
-              written by a run of (pdf)latex.  If this variable  is  not  set,
-              but  $out_dir is set, then $aux_dir is set to $out_dir, which is
-              the directory to which general output files are to be written.
 
-              Important note:  The  effect  of  $aux_dir,  if  different  from
-              $out_dir,  is  achieved by giving (pdf)latex the -aux-directory.
-              Currently (Dec. 2011 and later) this only works  on  the  MiKTeX
-              version of (pdf)latex.
 
 
+                                17 January 2018                             27
 
-                               12 December 2017                             27
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              written  by  a  run of (pdf)latex.  If this variable is not set,
+              but $out_dir is set, then $aux_dir is set to $out_dir, which  is
+              the directory to which general output files are to be written.
+
+              Important  note:   The  effect  of  $aux_dir,  if different from
+              $out_dir, is achieved by giving (pdf)latex  the  -aux-directory.
+              Currently  (Dec.  2011  and later) this only works on the MiKTeX
+              version of (pdf)latex.
+
               See also the documentation of $out_dir for some complications on
               what directory names are suitable.
 
-              If you also use the -cd option, and $out_dir (or $aux_dir)  con-
-              tains  a relative path, then the path is interpreted relative to
+              If  you also use the -cd option, and $out_dir (or $aux_dir) con-
+              tains a relative path, then the path is interpreted relative  to
               the document directory.
 
        $banner [0]
-              If nonzero, the banner message is printed across each page  when
-              converting  the  dvi  file to postscript.  Without modifying the
-              variable $banner_message, this is equivalent to  specifying  the
+              If  nonzero, the banner message is printed across each page when
+              converting the dvi file to postscript.   Without  modifying  the
+              variable  $banner_message,  this is equivalent to specifying the
               -d option.
 
               Note that if $banner is nonzero, the $postscript_mode is assumed
@@ -1805,7 +1814,7 @@
 
        $banner_intensity [0.95]
               Equivalent to the -bi option, this is a decimal number between 0
-              and 1 that specifies how dark to print the banner message. 0  is
+              and  1 that specifies how dark to print the banner message. 0 is
               black, 1 is white.  The default is just right if your toner car-
               tridge isn't running too low.
 
@@ -1814,50 +1823,50 @@
               dvi file to postscript.  This is equivalent to the -bm option.
 
        $banner_scale [220.0]
-              A  decimal  number  that  specifies how large the banner message
-              will be printed.  Experimentation is necessary to get the  right
-              scale  for  your message, as a rule of thumb the scale should be
-              about equal to 1100 divided by the number of characters  in  the
-              message.   The  Default  is just right for 5 character messages.
+              A decimal number that specifies how  large  the  banner  message
+              will  be printed.  Experimentation is necessary to get the right
+              scale for your message, as a rule of thumb the scale  should  be
+              about  equal  to 1100 divided by the number of characters in the
+              message.  The Default is just right for  5  character  messages.
               This is equivalent to the -bs option.
 
        @BIBINPUTS
-              This is an array variable, now mostly obsolete,  that  specifies
-              directories  where  latexmk  should  look  for  .bib  files.  By
+              This  is  an array variable, now mostly obsolete, that specifies
+              directories where  latexmk  should  look  for  .bib  files.   By
               default it is set from the BIBINPUTS environment variable of the
-              operating  system.   If  that environment variable is not set, a
-              single element list consisting of the current directory is  set.
+              operating system.  If that environment variable is  not  set,  a
+              single  element list consisting of the current directory is set.
               The format of the directory names depends on your operating sys-
               tem, of course.  Examples for setting this variable are:
 
                       @BIBINPUTS = ( ".", "C:\\bibfiles" );
-                      @BIBINPUTS = ( ".", "\\server\bibfiles" );
-                      @BIBINPUTS = ( ".", "C:/bibfiles" );
-                      @BIBINPUTS = ( ".", "//server/bibfiles" );
-                      @BIBINPUTS = ( ".", "/usr/local/texmf/bibtex/bib" );
 
-              Note that under MS Windows, either a  forward  slash  "/"  or  a
-              backward  slash "\" can be used to separate pathname components,
-              so the first two and the second  two  examples  are  equivalent.
-              Each  backward slash should be doubled to avoid running afoul of
 
 
+                                17 January 2018                             28
 
-                               12 December 2017                             28
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+                      @BIBINPUTS = ( ".", "\\server\bibfiles" );
+                      @BIBINPUTS = ( ".", "C:/bibfiles" );
+                      @BIBINPUTS = ( ".", "//server/bibfiles" );
+                      @BIBINPUTS = ( ".", "/usr/local/texmf/bibtex/bib" );
+
+              Note  that  under  MS  Windows,  either a forward slash "/" or a
+              backward slash "\" can be used to separate pathname  components,
+              so  the  first  two  and the second two examples are equivalent.
+              Each backward slash should be doubled to avoid running afoul  of
               Perl's rules for writing strings.
 
               Important note: This variable is now mostly obsolete in the cur-
               rent version of latexmk, since it has a better method of search-
-              ing for files using the kpsewhich  command.   However,  if  your
-              system  is an unusual one without the kpsewhich command, you may
+              ing  for  files  using  the kpsewhich command.  However, if your
+              system is an unusual one without the kpsewhich command, you  may
               need to set the variable @BIBINPUTS.
 
        $biber ["biber %O %S"]
@@ -1864,7 +1873,7 @@
               The biber processing program.
 
        $biber_silent_switch ["--onlylog"]
-              Switch(es) for the biber processing program when silent mode  is
+              Switch(es)  for the biber processing program when silent mode is
               on.
 
        $bibtex ["bibtex %O %S"]
@@ -1876,68 +1885,68 @@
 
        $bibtex_use [1]
               Under what conditions to run bibtex or biber.  When latexmk dis-
-              covers  from the log file that one (or more) bibtex/biber-gener-
-              ated bibliographies are used, it can run bibtex or  biber  when-
-              ever  it  appears  necessary  to regenerate the bbl file(s) from
-              their source bib  database  file(s).   But  sometimes,  the  bib
+              covers from the log file that one (or more)  bibtex/biber-gener-
+              ated  bibliographies  are used, it can run bibtex or biber when-
+              ever it appears necessary to regenerate  the  bbl  file(s)  from
+              their  source  bib  database  file(s).   But  sometimes, the bib
               file(s) are not available (e.g., for a document obtained from an
               external archive), but the bbl files are provided.  In that case
-              use  of  bibtex or biber will result in incorrect overwriting of
-              the precious  bbl  files.   The  variable  $bibtex_use  controls
-              whether  this  happens,  and  also  controls whether or not .bbl
+              use of bibtex or biber will result in incorrect  overwriting  of
+              the  precious  bbl  files.   The  variable  $bibtex_use controls
+              whether this happens, and also  controls  whether  or  not  .bbl
               files are deleted in a cleanup operation.
 
               The possible values of $bibtex_use are:
-                0: never use BibTeX or biber; never delete  .bbl  files  in  a
+                0:  never  use  BibTeX  or biber; never delete .bbl files in a
               cleanup.
-                1:  only  use  bibtex  or  biber if the bib files exist; never
+                1: only use bibtex or biber if  the  bib  files  exist;  never
               delete .bbl files in a cleanup.
-                1.5: only use bibtex or biber if the bib files  exist;  condi-
-              tionally  delete .bbl files in a cleanup (i.e., delete them only
+                1.5:  only  use bibtex or biber if the bib files exist; condi-
+              tionally delete .bbl files in a cleanup (i.e., delete them  only
               when the bib files all exist).
                 2: run bibtex or biber whenever it appears necessary to update
-              the  bbl  files,  without  testing  for the existence of the bib
-              files; always delete .bbl files in a cleanup.
+              the bbl files, without testing for  the  existence  of  the  bib
 
 
-       $cleanup_includes_cusdep_generated [0]
-              If nonzero, specifies that cleanup also deletes files  that  are
-              generated by custom dependencies.  (When doing a clean up, e.g.,
-              by use of the -C option, custom dependencies are those listed in
-              the .fdb_latexmk file from a previous run.)
 
+                                17 January 2018                             29
 
 
 
-                               12 December 2017                             29
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              files; always delete .bbl files in a cleanup.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
+       $cleanup_includes_cusdep_generated [0]
+              If  nonzero,  specifies that cleanup also deletes files that are
+              generated by custom dependencies.  (When doing a clean up, e.g.,
+              by use of the -C option, custom dependencies are those listed in
+              the .fdb_latexmk file from a previous run.)
 
        $cleanup_includes_generated [0]
-              If  nonzero,  specifies that cleanup also deletes files that are
-              detected in log file as being generated (see the \openout  lines
-              in  the  log  file).  It will also include files made from these
+              If nonzero, specifies that cleanup also deletes files  that  are
+              detected  in log file as being generated (see the \openout lines
+              in the log file).  It will also include files  made  from  these
               first generation generated files.
 
        $cleanup_mode [0]
-              If nonzero, specifies cleanup mode: 1 for full  cleanup,  2  for
-              cleanup  except  for dvi, ps and pdf files, 3 for cleanup except
-              for dep and aux files.  (There is also extra cleaning as  speci-
-              fied  by  the  $clean_ext,  $clean_full_ext  and @generated_exts
+              If  nonzero,  specifies  cleanup mode: 1 for full cleanup, 2 for
+              cleanup except for dvi, ps and pdf files, 3 for  cleanup  except
+              for  dep and aux files.  (There is also extra cleaning as speci-
+              fied by  the  $clean_ext,  $clean_full_ext  and  @generated_exts
               variables.)
 
-              This variable is equivalent to specifying one of the  -c  or  -C
-              options.   But there should be no need to set this variable from
+              This  variable  is  equivalent to specifying one of the -c or -C
+              options.  But there should be no need to set this variable  from
               an RC file.
 
        $clean_ext [""]
-              Extra extensions of files for latexmk to remove when any of  the
-              clean-up  options  (-c  or  -C)  is selected.  The value of this
+              Extra  extensions of files for latexmk to remove when any of the
+              clean-up options (-c or -C) is  selected.   The  value  of  this
               variable is a string containing the extensions separated by spa-
               ces.
 
@@ -1948,69 +1957,69 @@
                  $clean_ext = "out %R-blx.bib %R-figures*.log";
 
               in an initialization file will imply that when a clean-up opera-
-              tion is specified,  not  only  is  the  standard  set  of  files
-              deleted,  but  also  files of the form FOO.out, FOO-blx.bib, and
-              %R-figures*.log, where FOO stands for the basename of  the  file
+              tion  is  specified,  not  only  is  the  standard  set of files
+              deleted, but also files of the form  FOO.out,  FOO-blx.bib,  and
+              %R-figures*.log,  where  FOO stands for the basename of the file
               being processed (as in FOO.tex).
 
        $clean_full_ext [""]
-              Extra  extensions  of  files  for  latexmk to remove when the -C
+              Extra extensions of files for latexmk  to  remove  when  the  -C
               option is selected, i.e., extensions of files to remove when the
               .dvi, etc files are to be cleaned-up.
 
               More general patterns are allowed, as for $clean_ext.
 
-       $compiling_cmd   [undefined],  $failure_cmd  [undefined],  $success_cmd
+       $compiling_cmd  [undefined],  $failure_cmd  [undefined],   $success_cmd
        [undefined]
 
-              These variables specify commands that are  executed  at  certain
-              points  of  compilations  during  preview-continuous  mode.  One
-              motivation for their existance is  to  allow  convenient  visual
-              indications of compilation status even when the window receiving
-              the screen output of the compilation is hidden.
 
-              The commands are executed  at  the  following  points:  $compil-
-              ing_cmd  at the start of compilation, $success_cmd at the end of
-              a successful compilation, and $failure_cmd  at  the  end  of  an
 
 
+                                17 January 2018                             30
 
-                               12 December 2017                             30
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              unsuccessful  compilation.   If  any of above variables is unde-
-              fined (the default situation) or blank, then  the  corresponding
+              These  variables  specify  commands that are executed at certain
+              points of  compilations  during  preview-continuous  mode.   One
+              motivation  for  their  existance  is to allow convenient visual
+              indications of compilation status even when the window receiving
+              the screen output of the compilation is hidden.
+
+              The  commands  are  executed  at  the following points: $compil-
+              ing_cmd at the start of compilation, $success_cmd at the end  of
+              a  successful  compilation,  and  $failure_cmd  at the end of an
+              unsuccessful compilation.  If any of above  variables  is  unde-
+              fined  (the  default situation) or blank, then the corresponding
               command is not executed.
 
               An example of a typical setting of these variables is as follows
 
-                  $compiling_cmd  =  "xdotool  search --name \"%D\" set_window
+                  $compiling_cmd = "xdotool search  --name  \"%D\"  set_window
               --name \"%D compiling\"";
-                  $success_cmd   = "xdotool search  --name  \"%D\"  set_window
+                  $success_cmd    =  "xdotool  search --name \"%D\" set_window
               --name \"%D OK\"";
-                  $failure_cmd    =  "xdotool  search --name \"%D\" set_window
+                  $failure_cmd   = "xdotool search  --name  \"%D\"  set_window
               --name \"%D FAILURE\"";
 
-              These assume that the program xdotool  is  installed,  that  the
-              previewer  is using an X-Window system for display, and that the
-              title of the window contains the name of the displayed file,  as
-              it  normally  does.   When the commands are executed, the place-
-              holder string %D is replaced by  the  name  of  the  destination
+              These  assume  that  the  program xdotool is installed, that the
+              previewer is using an X-Window system for display, and that  the
+              title  of the window contains the name of the displayed file, as
+              it normally does.  When the commands are  executed,  the  place-
+              holder  string  %D  is  replaced  by the name of the destination
               file, which is the previewed file.  The above commands result in
               an appropriate string being appended to the filename in the win-
               dow title: " compiling", " OK", or " FAILURE".
 
-              Other  placeholders that can be used are %S, %T, and %R, with %S
-              and %T normally being identical. These can be useful for a  com-
-              mand  changing  the title of the edit window. The visual indica-
-              tion in a window title can useful, since the user does not  have
-              to  keep shifting attention to the (possibly hidden) compilation
+              Other placeholders that can be used are %S, %T, and %R, with  %S
+              and  %T normally being identical. These can be useful for a com-
+              mand changing the title of the edit window. The  visual  indica-
+              tion  in a window title can useful, since the user does not have
+              to keep shifting attention to the (possibly hidden)  compilation
               window to know the status of the compilation.
 
        @cus_dep_list [()]
@@ -2017,40 +2026,40 @@
               Custom dependency list -- see section on "Custom Dependencies".
 
        @default_excluded_files [()]
-              When latexmk is invoked with no files specified on  the  command
+              When  latexmk  is invoked with no files specified on the command
               line, then, by default, it will process all files in the current
               directory with the extension .tex.  (In general, it will process
               the files specified in the @default_files variable.)
 
-              But  sometimes  you  want  to exclude particular files from this
-              default list.  In that case you can specify the  excluded  files
+              But sometimes you want to exclude  particular  files  from  this
+              default  list.   In that case you can specify the excluded files
               in the array @default_excluded_files.  For example if you wanted
-              to process all .tex files  with  the  exception  of  common.tex,
-              which  is  a not a standard alone LaTeX file but a file input by
+              to  process  all  .tex  files  with the exception of common.tex,
+              which is a not a standard alone LaTeX file but a file  input  by
               some or all of the others, you could do
 
-                   @default_files = ("*.tex");
 
-                   @default_excluded_files = ("common.tex");
 
-              If you have a variable or large number of files to be processed,
-              this  method  saves  you  from  having to list them in detail in
-              @default_files and having to update  the  list  every  time  you
-              change the set of files to be processed.
 
+                                17 January 2018                             31
 
 
 
-                               12 December 2017                             31
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+                   @default_files = ("*.tex");
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+                   @default_excluded_files = ("common.tex");
 
+              If you have a variable or large number of files to be processed,
+              this method saves you from having to  list  them  in  detail  in
+              @default_files  and  having  to  update  the list every time you
+              change the set of files to be processed.
 
-              Notes:  1.  This variable has no effect except when no files are
+              Notes: 1. This variable has no effect except when no  files  are
               specified on the latexmk command line.  2. Wildcards are allowed
               in @default_excluded_files.
 
@@ -2057,16 +2066,16 @@
        @default_files [("*.tex")]
               Default list of files to be processed.
 
-              If  no filenames are specified on the command line, latexmk pro-
-              cesses all tex files specified in the  @default_files  variable,
-              which  by  default is set to all tex files ("*.tex") in the cur-
-              rent directory.  This is a convenience: just run latexmk and  it
-              will  process  an  appropriate  set of files.  But sometimes you
+              If no filenames are specified on the command line, latexmk  pro-
+              cesses  all  tex files specified in the @default_files variable,
+              which by default is set to all tex files ("*.tex") in  the  cur-
+              rent  directory.  This is a convenience: just run latexmk and it
+              will process an appropriate set of  files.   But  sometimes  you
               want only some of these files to be processed.  In this case you
-              can  list the files to be processed by setting @default_files in
-              an initialization file (e.g., the file "latexmkrc" in  the  cur-
-              rent  directory).  Then if no files are specified on the command
-              line then the files you specify by  setting  @default_files  are
+              can list the files to be processed by setting @default_files  in
+              an  initialization  file (e.g., the file "latexmkrc" in the cur-
+              rent directory).  Then if no files are specified on the  command
+              line  then  the  files you specify by setting @default_files are
               processed.
 
               Three examples:
@@ -2077,132 +2086,130 @@
 
                    @default_files = ("*.tex", "*.dtx");
 
-              Note  that  more  than  file  may be given, and that the default
-              extension is ".tex".  Wild cards are allowed.   The  parentheses
+              Note that more than file may be  given,  and  that  the  default
+              extension  is  ".tex".  Wild cards are allowed.  The parentheses
               are  because  @default_files  is  an  array  variable,  i.e.,  a
               sequence of filename specifications is possible.
 
-              If you want latexmk to process all .tex files with a few  excep-
+              If  you want latexmk to process all .tex files with a few excep-
               tions, see the @default_excluded_files array variable.
 
        $dependents_phony [0]
-              If  a  list  of dependencies is output, this variable determines
-              whether to include a phony target for each source file.  If  you
-              use  the  dependents  list  in  a Makefile, the dummy rules work
-              around errors make gives if  you  remove  header  files  without
+              If a list of dependencies is output,  this  variable  determines
+              whether  to include a phony target for each source file.  If you
+              use the dependents list in a  Makefile,  the  dummy  rules  work
+              around  errors  make  gives  if  you remove header files without
               updating the Makefile to match.
 
        $dependents_list [0]
-              Whether  to  display  a  list(s) of dependencies at the end of a
+              Whether to display a list(s) of dependencies at  the  end  of  a
               run.
 
-       $deps_file ["-"]
-              Name of file to receive list(s) of dependencies at the end of  a
-              run,  to be used if $dependesnt_list is set.  If the filename is
-              "-", then the dependency list is set to stdout  (i.e.,  normally
-              the screen).
 
-       $do_cd [0]
-              Whether  to  change working directory to the directory specified
 
+                                17 January 2018                             32
 
 
-                               12 December 2017                             32
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $deps_file ["-"]
+              Name  of file to receive list(s) of dependencies at the end of a
+              run, to be used if $dependesnt_list is set.  If the filename  is
+              "-",  then  the dependency list is set to stdout (i.e., normally
+              the screen).
 
-
-              for the main source file  before  processing  it.   The  default
+       $do_cd [0]
+              Whether to change working directory to the  directory  specified
+              for  the  main  source  file  before processing it.  The default
               behavior is not to do this, which is the same as the behavior of
-              latex and pdflatex programs.  This variable is set  by  the  -cd
+              latex  and  pdflatex  programs.  This variable is set by the -cd
               and -cd- options on latexmk's command line.
 
        $dvi_filter [empty]
-              The  dvi  file  filter  to be run on the newly produced dvi file
-              before other  processing.   Equivalent  to  specifying  the  -dF
+              The dvi file filter to be run on the  newly  produced  dvi  file
+              before  other  processing.   Equivalent  to  specifying  the -dF
               option.
 
        $dvi_mode [See below for default]
-              If  nonzero, generate a dvi version of the document.  Equivalent
+              If nonzero, generate a dvi version of the document.   Equivalent
               to the -dvi option.
 
-              The variable  $dvi_mode  defaults  to  0,  but  if  no  explicit
-              requests  are  made  for  other types of file (postscript, pdf),
-              then $dvi_mode will be set to 1.  In addition, if a request  for
-              a  file  for which a .dvi file is a prerequisite, then $dvi_mode
+              The  variable  $dvi_mode  defaults  to  0,  but  if  no explicit
+              requests are made for other types  of  file  (postscript,  pdf),
+              then  $dvi_mode will be set to 1.  In addition, if a request for
+              a file for which a .dvi file is a prerequisite,  then  $dvi_mode
               will be set to 1.
 
        $dvi_previewer ["start xdvi %O %S" under UNIX]
-              The command to invoke a dvi-previewer.   [Under  MS-Windows  the
-              default  is "start"; then latexmk arranges to use the MS-Windows
-              start program, which will cause to be run whatever  command  the
+              The  command  to  invoke a dvi-previewer.  [Under MS-Windows the
+              default is "start"; then latexmk arranges to use the  MS-Windows
+              start  program,  which will cause to be run whatever command the
               system has associated with .dvi files.]
 
-              Important  note:  Normally you will want to have a previewer run
+              Important note: Normally you will want to have a  previewer  run
               detached, so that latexmk doesn't wait for the previewer to ter-
-              minate  before continuing its work.  So normally you should pre-
-              fix the command by "start ", which  flags  to  latexmk  that  it
-              should  do  the  detaching  of the previewer itself (by whatever
-              method is appropriate to the operating system).   But  sometimes
+              minate before continuing its work.  So normally you should  pre-
+              fix  the  command  by  "start  ", which flags to latexmk that it
+              should do the detaching of the  previewer  itself  (by  whatever
+              method  is  appropriate to the operating system).  But sometimes
               letting latexmk do the detaching is not appropriate (for a vari-
-              ety of non-trivial reasons), so you should put the "start "  bit
+              ety  of non-trivial reasons), so you should put the "start " bit
               in yourself, whenever it is needed.
 
        $dvi_previewer_landscape ["start xdvi %O %S"]
               The command to invoke a dvi-previewer in landscape mode.  [Under
-              MS-Windows the default is "start"; then latexmk arranges to  use
-              the  MS-Windows  start program, which will cause to be run what-
+              MS-Windows  the default is "start"; then latexmk arranges to use
+              the MS-Windows start program, which will cause to be  run  what-
               ever command the system has associated with .dvi files.]
 
        $dvipdf ["dvipdf %O %S %D"]
               Command to convert dvi to pdf file.  A common reconfiguration is
-              to  use the dvipdfm command, which needs its arguments in a dif-
+              to use the dvipdfm command, which needs its arguments in a  dif-
               ferent order:
 
-                   $dvipdf = "dvipdfm %O -o %D %S";
 
-              WARNING: The default dvipdf  script  generates  pdf  files  with
-              bitmapped fonts, which do not look good when viewed by acroread.
-              That script should be modified to give  dvips  the  options  "-P
-              pdf" to ensure that type 1 fonts are used in the pdf file.
 
+                                17 January 2018                             33
 
 
 
-                               12 December 2017                             33
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+                   $dvipdf = "dvipdfm %O -o %D %S";
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              WARNING:  The  default  dvipdf  script  generates pdf files with
+              bitmapped fonts, which do not look good when viewed by acroread.
+              That  script  should  be  modified to give dvips the options "-P
+              pdf" to ensure that type 1 fonts are used in the pdf file.
 
-
        $dvipdf_silent_switch ["-q"]
               Switch(es) for dvipdf program when silent mode is on.
 
-              N.B.  The  standard  dvipdf program runs silently, so adding the
-              silent switch has no effect, but is actually innocuous.  But  if
-              an  alternative program is used, e.g., dvipdfmx, then the silent
-              switch has an  effect.   The  default  setting  is  correct  for
+              N.B. The standard dvipdf program runs silently,  so  adding  the
+              silent  switch has no effect, but is actually innocuous.  But if
+              an alternative program is used, e.g., dvipdfmx, then the  silent
+              switch  has  an  effect.   The  default  setting  is correct for
               dvipdfm and dvipdfmx.
 
        $dvips ["dvips %O -o %D %S"]
-              The  program to used as a filter to convert a .dvi file to a .ps
-              file.  If pdf is going to be generated from pdf, then the  value
-              of  the  $dvips_pdf_switch  variable  --  see  below  -- will be
+              The program to used as a filter to convert a .dvi file to a  .ps
+              file.   If pdf is going to be generated from pdf, then the value
+              of the $dvips_pdf_switch  variable  --  see  below  --  will  be
               included in the options substituted for "%O".
 
        $dvips_landscape ["dvips -tlandscape %O -o %D %S"]
-              The program to used as a filter to convert a .dvi file to a  .ps
+              The  program to used as a filter to convert a .dvi file to a .ps
               file in landscape mode.
 
        $dvips_pdf_switch ["-P pdf"]
-              Switch(es)  for  dvips  program when pdf file is to be generated
+              Switch(es) for dvips program when pdf file is  to  be  generated
               from ps file.
 
        $dvips_silent_switch ["-q"]
@@ -2209,47 +2216,46 @@
               Switch(es) for dvips program when silent mode is on.
 
        $dvi_update_command [""]
-              When the dvi previewer is set to be updated by  running  a  com-
-              mand,  this is the command that is run.  See the information for
+              When  the  dvi  previewer is set to be updated by running a com-
+              mand, this is the command that is run.  See the information  for
               the variable $dvi_update_method for further information, and see
-              information  on  the  variable $pdf_update_method for an example
+              information on the variable $pdf_update_method  for  an  example
               for the analogous case of a pdf previewer.
 
        $dvi_update_method [2 under UNIX, 1 under MS-Windows]
-              How the dvi viewer updates its display when  the  dvi  file  has
-              changed.     The    values    here    apply   equally   to   the
+              How  the  dvi  viewer  updates its display when the dvi file has
+              changed.    The   values   here    apply    equally    to    the
               $pdf_update_method and to the $ps_update_method variables.
                   0 => update is automatic,
                   1=> manual update by user, which may only mean a mouse click
               on the viewer's window or may mean a more serious action.
-                  2  =>  Send  the  signal,  whose  number  is in the variable
-              $dvi_update_signal.  The default value under  UNIX  is  suitable
+                  2 => Send the  signal,  whose  number  is  in  the  variable
+              $dvi_update_signal.   The  default  value under UNIX is suitable
               for xdvi.
-                  3  => Viewer cannot do an update, because it locks the file.
+                  3 => Viewer cannot do an update, because it locks the  file.
               (As with acroread under MS-Windows.)
-                  4 => run a command to do the update.  The command is  speci-
+                  4  => run a command to do the update.  The command is speci-
               fied by the variable $dvi_update_command.
 
-              See  information on the variable $pdf_update_method for an exam-
-              ple of updating by command.
 
-       $dvi_update_signal [Under UNIX: SIGUSR1, which  is  a  system-dependent
-       value]
-              The  number of the signal that is sent to the dvi viewer when it
 
+                                17 January 2018                             34
 
 
-                               12 December 2017                             34
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              See information on the variable $pdf_update_method for an  exam-
+              ple of updating by command.
 
-
-              is updated by sending a signal -- see  the  information  on  the
-              variable  $dvi_update_method.   The  default  value  is  the one
+       $dvi_update_signal  [Under  UNIX:  SIGUSR1, which is a system-dependent
+       value]
+              The number of the signal that is sent to the dvi viewer when  it
+              is  updated  by  sending  a signal -- see the information on the
+              variable $dvi_update_method.   The  default  value  is  the  one
               appropriate for xdvi on a UNIX system.
 
        $failure_cmd [undefined]
@@ -2256,73 +2262,140 @@
               See the documentation for $compiling_cmd.
 
        $fdb_ext ["fdb_latexmk"]
-              The extension of the file which latexmk generates to  contain  a
-              database  of information on source files.  You will not normally
+              The  extension  of the file which latexmk generates to contain a
+              database of information on source files.  You will not  normally
               need to change this.
 
+       $filetime_causality_threshold   [5];  $filetime_offset_report_threshold
+       [30]. (Units of seconds.)
+
+              These variables control how latexmk  deals  with  the  following
+              issue,  which  can  affect the use of files that are on a remote
+              filesystem (network share) instead of being  on  a  file  system
+              local  to  the  computer running latexmk.  Almost users will not
+              have to worry about these settings, and can ignore the following
+              explanation.
+
+              In  almost all situations, latexmk does not need to use the time
+              stamps of the files it works with.  However, there are a  couple
+              of  situations  when it needs to know whether a certain file was
+              created in the current run of a program (e.g., (pdf)latex) or is
+              a  leftover  file from a previous run. It does this by comparing
+              the modification time of the file  with  the  system  time  just
+              before the program was started. If the modification time is ear-
+              lier than when the program was started, the file is  a  leftover
+              file,  which  latexmk  treats as if it were not created.  If the
+              filetime is at least the program start  time,  then  it  can  be
+              assumed that the file was created in the current run.
+
+              Unfortunately,  this  test  can  fail if the file is on a remote
+              system, since its system time is  not  necessarily  synchronized
+              with  that  of  the  local  system; the timestamps on the remote
+              files are set by the remote system, not the local system.   Gen-
+              erally,  modern  operating  systems  regularly synchronize their
+              time with a server, so the non-synchronization is  mostly  small
+              (a second or so, or a few seconds).  But even a small difference
+              can mess up latexmk's test.
+
+              Latexmk measures the time difference between the time on the two
+              systems  and  compensates  for  this.  But the measurement (in a
+              system-independent way) is only accurate to a second or two.  So
+              latexmk  allows  for  a threshold on the difference between file
+              and system time before it concludes that a file  is  a  leftover
+
+
+
+                                17 January 2018                             35
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+              file  from  a  previous  run.  The configuration variable $file-
+              time_causality_theshhold, which in units of  seconds,  specifies
+              this threshold.  Luckily high precision is not needed.  The pre-
+              vious run is normally the previous run in a  human  run-edit-run
+              cycle,  and  is  at  least  many seconds back.  A few seconds is
+              therefore  appropriate  for  the  threshold,   $filetime_causal-
+              ity_theshhold;  it  should be non-negative always, and should be
+              bigger than 2 if a remote filesystem or network share is used.
+
+              If the difference in system times on the two systems  is  large,
+              it  normally  indicates that at least one of the systems is mis-
+              configured.   The   variable   $filetime_offset_report_threshold
+              specifies  the  smallest  size  of the difference (or offset) in
+              seconds between the times of the local and remote system  beyond
+              which  the offset is reported.  This is reported at the point in
+              the latexmk's progress that it measures the offset.  The  report
+              is made if silent mode is used and diagnostic mode is not on.
+
+
        $force_mode [0]
-              If nonzero, continue processing past minor latex errors  includ-
+              If  nonzero, continue processing past minor latex errors includ-
               ing unrecognized cross references.  Equivalent to specifying the
               -f option.
 
-       @generated_exts [( aux , bbl , idx , ind , lof , lot  ,  out  ,  toc  ,
+       @generated_exts  [(  aux  ,  bbl  , idx , ind , lof , lot , out , toc ,
        $fdb_ext )]
-              This  contains a list of extensions for files that are generated
-              during a LaTeX run and that are read in by LaTeX in later  runs,
+              This contains a list of extensions for files that are  generated
+              during  a LaTeX run and that are read in by LaTeX in later runs,
               either directly or indirectly.
 
-              This  list  has  two  uses:  (a)  to set the kinds of file to be
+              This list has two uses: (a) to set  the  kinds  of  file  to  be
               deleted in a cleanup operation (with the -c, -C, -CA, -g and -gg
-              options),  and  (b)  in  the determination of whether a rerun of
+              options), and (b) in the determination of  whether  a  rerun  of
               (pdf)LaTeX is needed after a run that gives an error.
 
               (Normally, a change of a source file during a run should provoke
-              a  rerun.  This includes a file generated by LaTeX, e.g., an aux
-              file, that is read in on subsequent runs.  But after a run  that
-              results  in  an error, a new run should occur until the user has
-              made a change in the files.  But the user may have corrected  an
+              a rerun.  This includes a file generated by LaTeX, e.g., an  aux
+              file,  that is read in on subsequent runs.  But after a run that
+              results in an error, a new run should occur until the  user  has
+              made  a change in the files.  But the user may have corrected an
               error in a source .tex file during the run.  So latexmk needs to
               distinguish user-generated and automatically generated files; it
-              determines  the  automatically  generated  files  as  those with
+              determines the  automatically  generated  files  as  those  with
               extensions in the list in @generated_exts.)
 
-              A convenient way to add an extra extension to the list,  without
-              losing  the already defined ones is to use a push command in the
+              A  convenient way to add an extra extension to the list, without
+              losing the already defined ones is to use a push command in  the
               line in an RC file.  E.g.,
 
                               push @generated_exts, "end";
 
-              adds the extension "end" to the  list  of  predefined  generated
-              extensions.   (This extension is used by the RevTeX package, for
+              adds  the  extension  "end"  to the list of predefined generated
+              extensions.  (This extension is used by the RevTeX package,  for
               example.)
 
-       $go_mode [0]
-              If nonzero, process files regardless of timestamps, and is  then
-              equivalent to the -g option.
 
-       %hash_calc_ignore_pattern
-              !!!This variable is for experts only!!!
 
+                                17 January 2018                             36
 
 
-                               12 December 2017                             35
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $go_mode [0]
+              If  nonzero, process files regardless of timestamps, and is then
+              equivalent to the -g option.
 
+       %hash_calc_ignore_pattern
+              !!!This variable is for experts only!!!
 
-              The  general rule latexmk uses for determining when an extra run
-              of some program is needed is that one of the  source  files  has
-              changed.   But  consider for example a latex package that causes
-              an encapsulated postscript file (an "eps" file) to be made  that
-              is  to  be read in on the next run.  The file contains a comment
-              line giving its creation date and time.  On  the  next  run  the
-              time  changes,  latex  sees  that  the eps file has changed, and
-              therefore reruns latex.  This causes an infinite loop,  that  is
-              only  terminated  because  latexmk  has a limit on the number of
+              The general rule latexmk uses for determining when an extra  run
+              of  some  program  is needed is that one of the source files has
+              changed.  But consider for example a latex package  that  causes
+              an  encapsulated postscript file (an "eps" file) to be made that
+              is to be read in on the next run.  The file contains  a  comment
+              line  giving  its  creation  date and time.  On the next run the
+              time changes, latex sees that the  eps  file  has  changed,  and
+              therefore  reruns  latex.  This causes an infinite loop, that is
+              only terminated because latexmk has a limit  on  the  number  of
               runs to guard against pathological situations.
 
               But the changing line has no real effect, since it is a comment.
@@ -2331,47 +2404,40 @@
                  $hash_calc_ignore_pattern{'eps'} = '^%%CreationDate: ';
 
               This creates a rule for files with extension .eps about lines to
-              ignore.  The left-hand side is a Perl idiom for setting an  item
-              in  a hash.  Note that the file extension is specified without a
+              ignore.   The left-hand side is a Perl idiom for setting an item
+              in a hash.  Note that the file extension is specified without  a
               period.  The value, on the right-hand side, is a string contain-
-              ing  a  regular expresssion.  (See documentation on Perl for how
-              they are to be specified in general.)  This  particular  regular
-              expression  specifies that lines beginning with "%%CreationDate:
-              " are to be ignored in deciding whether  a  file  of  the  given
+              ing a regular expresssion.  (See documentation on Perl  for  how
+              they  are  to be specified in general.)  This particular regular
+              expression specifies that lines beginning with  "%%CreationDate:
+              "  are  to  be  ignored  in deciding whether a file of the given
               extension .eps has changed.
 
-              There  is  only one regular expression available for each exten-
-              sion.  If you need more one pattern to specify lines to  ignore,
-              then  you  need  to  combine  the patterns into a single regular
-              expression.  The simplest method is separate the different  sim-
-              ple  patterns  by a vertical bar character (indicating "alterna-
+              There is only one regular expression available for  each  exten-
+              sion.   If you need more one pattern to specify lines to ignore,
+              then you need to combine the  patterns  into  a  single  regular
+              expression.   The simplest method is separate the different sim-
+              ple patterns by a vertical bar character  (indicating  "alterna-
               tion" in the jargon of regular expressions).  For example,
 
-                 $hash_calc_ignore_pattern{'eps'}     =      '^%%CreationDate:
+                 $hash_calc_ignore_pattern{'eps'}      =     '^%%CreationDate:
               |^%%Title: ';
 
-              causes   lines  starting  with  either  "^%%CreationDate:  "  or
+              causes  lines  starting  with  either  "^%%CreationDate:  "   or
               "^%%Title: " to be ignored.
 
-              It may happen that a pattern to be ignored is specified in,  for
-              example,  in  a system or user initialization file, and you wish
-              to remove this in a file that is read later.  To  do  this,  you
+              It  may happen that a pattern to be ignored is specified in, for
+              example, in a system or user initialization file, and  you  wish
+              to  remove  this  in a file that is read later.  To do this, you
               use Perl's delete function, e.g.,
 
                   delete $hash_calc_ignore_pattern{'eps'};
 
 
-       $kpsewhich ["kpsewhich %S"]
-              The  program  called to locate a source file when the name alone
-              is not sufficient.  Most filenames used by latexmk  have  suffi-
-              cient  path  information  to  be found directly.  But sometimes,
-              notably when a .bib or a .bst file is found from the log file of
-              a  bibtex or biber run, only the base name of the file is known,
-              but not its path. The program specified by $kpsewhich is used to
 
 
 
-                               12 December 2017                             36
+                                17 January 2018                             37
 
 
 
@@ -2380,74 +2446,81 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       $kpsewhich ["kpsewhich %S"]
+              The program called to locate a source file when the  name  alone
+              is  not  sufficient.  Most filenames used by latexmk have suffi-
+              cient path information to be  found  directly.   But  sometimes,
+              notably when a .bib or a .bst file is found from the log file of
+              a bibtex or biber run, only the base name of the file is  known,
+              but not its path. The program specified by $kpsewhich is used to
               find it.
 
-              (For  advanced  users:  Because  of  the  different way in which
-              latexmk uses the command specified in $kpsewhich,  some  of  the
-              possibilities  listed in the FORMAT OF COMMAND SPECIFICATIONS do
+              (For advanced users: Because  of  the  different  way  in  which
+              latexmk  uses  the  command specified in $kpsewhich, some of the
+              possibilities listed in the FORMAT OF COMMAND SPECIFICATIONS  do
               not apply.  The internal and start keywords are not available. A
               simple command specification with possible options and then "%S"
-              is all that is guaranteed to work.  Note  that  for  other  com-
+              is  all  that  is  guaranteed to work.  Note that for other com-
               mands, "%S" is substituted by a single source file. In contrast,
               for $kpsewhich, "%S" may be substituted by a long list of space-
-              separated  filenames,  each  of  which is quoted.  The result on
+              separated filenames, each of which is  quoted.   The  result  on
               STDOUT of running the command is then piped to latexmk.)
 
-              See also the @BIBINPUTS variable for another  way  that  latexmk
+              See  also  the  @BIBINPUTS variable for another way that latexmk
               also uses to try to locate files; it applies only in the case of
               .bib files.
 
        $kpsewhich_show [0]
-              Whether to show diagnostics about invocations of kpsewhich:  the
-              command  line  use to invoke it and the results.  These diagnos-
-              tics are shown if $kpsewhich_show is non-zero or if  diagnostics
-              mode  is on.  (But in the second case, lots of other diagnostics
-              are also shown.)  Without these  diagnostics  there  is  nothing
-              visible  in  latexmk's  screen output about invocations of kpse-
+              Whether  to show diagnostics about invocations of kpsewhich: the
+              command line use to invoke it and the results.   These  diagnos-
+              tics  are shown if $kpsewhich_show is non-zero or if diagnostics
+              mode is on.  (But in the second case, lots of other  diagnostics
+              are  also  shown.)   Without  these diagnostics there is nothing
+              visible in latexmk's screen output about  invocations  of  kpse-
               which.
 
        $landscape_mode [0]
               If nonzero, run in landscape mode, using the landscape mode pre-
-              viewers  and dvi to postscript converters.  Equivalent to the -l
+              viewers and dvi to postscript converters.  Equivalent to the  -l
               option.  Normally not needed with current previewers.
 
        $latex ["latex %O %S"]
               The LaTeX processing program.  Note that as with other programs,
-              you  can  use  this  variable not just to change the name of the
+              you can use this variable not just to change  the  name  of  the
               program used, but also specify options to the program.  E.g.,
 
                                   $latex = "latex --src-specials";
 
        %latex_input_extensions
-              This variable specifies the extensions tried by latexmk when  it
-              finds  that a LaTeX run resulted in an error that a file has not
-              been found, and the file is given without  an  extension.   This
-              typically  happens  when LaTeX commands of the form \input{file}
-              or \includegraphics{figure}, when the relevant source file  does
+              This  variable specifies the extensions tried by latexmk when it
+              finds that a LaTeX run resulted in an error that a file has  not
+              been  found,  and  the file is given without an extension.  This
+              typically happens when LaTeX commands of the  form  \input{file}
+              or  \includegraphics{figure}, when the relevant source file does
               not exist.
 
-              In  this  situation, latexmk searches for custom dependencies to
-              make the missing file(s), but restricts  it  to  the  extensions
-              specified  by the variable %latex_input_extensions.  The default
-              extensions are 'tex' and 'eps'.
+              In this situation, latexmk searches for custom  dependencies  to
 
-              (For Perl experts: %latex_input_extensions is a hash whose  keys
-              are  the  extensions.   The values are irrelevant.)  Two subrou-
-              tines  are  provided  for  manipulating  this  and  the  related
 
 
+                                17 January 2018                             38
 
-                               12 December 2017                             37
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              variable     %pdflatex_input_extensions,    add_input_ext    and
-              remove_input_ext.  They are used as in  the  following  examples
+              make  the  missing  file(s),  but restricts it to the extensions
+              specified by the variable %latex_input_extensions.  The  default
+              extensions are 'tex' and 'eps'.
+
+              (For  Perl experts: %latex_input_extensions is a hash whose keys
+              are the extensions.  The values are  irrelevant.)   Two  subrou-
+              tines  are  provided for manipulating this and the related vari-
+              able     %pdflatex_input_extensions,      add_input_ext      and
+              remove_input_ext.   They  are  used as in the following examples
               are possible lines in an initialization file:
 
                   remove_input_ext( 'latex', 'tex' );
@@ -2456,19 +2529,19 @@
 
                   add_input_ext( 'latex', 'asdf' );
 
-              add  the  extension 'asdf to latex_input_extensions.  (Naturally
+              add the extension 'asdf to  latex_input_extensions.   (Naturally
               with such an extension, you should have made an appropriate cus-
               tom dependency for latexmk, and should also have done the appro-
-              priate programming in the LaTeX source file to enable  the  file
-              to  be  read.   The standard extensions are handled by LaTeX and
-              its graphics/graphicx packages.
+              priate  programming  in the LaTeX source file to enable the file
+              to be read.  The standard extensions are handled  by  LaTeX  and
+              its graphics/graphicx packages.)
 
        $latex_silent_switch ["-interaction=batchmode"]
-              Switch(es) for the LaTeX processing program when silent mode  is
+              Switch(es)  for the LaTeX processing program when silent mode is
               on.
 
-              If  you  use MikTeX, you may prefer the results if you configure
-              the options to include -c-style-errors, e.g., by  the  following
+              If you use MikTeX, you may prefer the results if  you  configure
+              the  options  to include -c-style-errors, e.g., by the following
               line in an initialization file
 
                 $latex_silent_switch   =   "-interaction=batchmode   -c-style-
@@ -2478,7 +2551,7 @@
        $lpr ["lpr %O %S" under UNIX/Linux, "NONE lpr" under MS-Windows]
               The command to print postscript files.
 
-              Under MS-Windows (unlike UNIX/Linux), there is no standard  pro-
+              Under  MS-Windows (unlike UNIX/Linux), there is no standard pro-
               gram for printing files.  But there are ways you can do it.  For
               example, if you have gsview installed, you could use it with the
               option "/p":
@@ -2485,59 +2558,58 @@
 
                   $lpr = '"c:/Program Files/Ghostgum/gsview/gsview32.exe" /p';
 
-              If  gsview  is installed in a different directory, you will need
-              to make the appropriate change.  Note the combination of  single
-              and  double  quotes  around the name.  The single quotes specify
-              that this is a string to be assigned to the configuration  vari-
-              able  $lpr.   The double quotes are part of the string passed to
-              the operating system to get the command obeyed; this  is  neces-
+              If gsview is installed in a different directory, you  will  need
+              to  make the appropriate change.  Note the combination of single
+              and double quotes around the name.  The  single  quotes  specify
+              that  this is a string to be assigned to the configuration vari-
+              able $lpr.  The double quotes are part of the string  passed  to
+              the  operating  system to get the command obeyed; this is neces-
               sary because one part of the command name ("Program Files") con-
               tains a space which would otherwise be misinterpreted.
 
-       $lpr_dvi ["NONE lpr_dvi"]
-              The printing program to print dvi files.
 
-       $lpr_pdf ["NONE lpr_pdf"]
-              The printing program to print pdf files.
 
+                                17 January 2018                             39
 
 
 
-                               12 December 2017                             38
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       $lpr_dvi ["NONE lpr_dvi"]
+              The printing program to print dvi files.
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $lpr_pdf ["NONE lpr_pdf"]
+              The printing program to print pdf files.
 
-
-              Under MS-Windows you could set this to  use  gsview,  if  it  is
+              Under  MS-Windows  you  could  set  this to use gsview, if it is
               installed, e.g.,
 
                   $lpr = '"c:/Program Files/Ghostgum/gsview/gsview32.exe" /p';
 
-              If  gsview  is installed in a different directory, you will need
-              to make the appropriate change.  Note the double  quotes  around
+              If gsview is installed in a different directory, you  will  need
+              to  make  the appropriate change.  Note the double quotes around
               the name: this is necessary because one part of the command name
               ("Program Files") contains a space which would otherwise be mis-
               interpreted.
 
        $lualatex ["lualatex %O %S"]
-              The  LaTeX processing program that is to be used when the luala-
+              The LaTeX processing program that is to be used when the  luala-
               tex program is called for (e.g., by the option -lualatex.
 
        %lualatex_input_extensions
-              This variable specifies the extensions tried by latexmk when  it
-              finds  that  a lualatex run resulted in an error that a file has
-              not been found, and the file  is  given  without  an  extension.
-              This   typically   happens  when  LaTeX  commands  of  the  form
+              This  variable specifies the extensions tried by latexmk when it
+              finds that a lualatex run resulted in an error that a  file  has
+              not  been  found,  and  the  file is given without an extension.
+              This  typically  happens  when  LaTeX  commands  of   the   form
               \input{file}  or  \includegraphics{figure},  when  the  relevant
               source file does not exist.
 
-              In  this  situation, latexmk searches for custom dependencies to
-              make the missing file(s), but restricts  it  to  the  extensions
-              specified   by  the  variable  %pdflatex_input_extensions.   The
+              In this situation, latexmk searches for custom  dependencies  to
+              make  the  missing  file(s),  but restricts it to the extensions
+              specified  by  the  variable  %pdflatex_input_extensions.    The
               default extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
               See details of the %latex_input_extensions for other information
@@ -2544,10 +2616,10 @@
               that equally applies to %lualatex_input_extensions.
 
        $lualatex_silent_switch ["-interaction=batchmode"]
-              Switch(es)  for  the lualatex program (specified in the variable
+              Switch(es) for the lualatex program (specified in  the  variable
               $lualatex) when silent mode is on.
 
-              See details of the $latex_silent_switch  for  other  information
+              See  details  of  the $latex_silent_switch for other information
               that equally applies to $lualatex_silent_switch.
 
        $make ["make"]
@@ -2557,19 +2629,13 @@
               The index processing program.
 
        $makeindex_silent_switch ["-q"]
-              Switch(es)  for the index processing program when silent mode is
+              Switch(es) for the index processing program when silent mode  is
               on.
 
-       $max_repeat [5]
-              The maximum number of  times  latexmk  will  run  latex/pdflatex
-              before  deciding  that there may be an infinite loop and that it
-              needs to bail out, rather than rerunning latex/pdflatex again to
-              resolve  cross-references,  etc.   The  default value covers all
-              normal cases.
 
 
 
-                               12 December 2017                             39
+                                17 January 2018                             40
 
 
 
@@ -2578,64 +2644,64 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              (Note that the "etc" covers a lot of  cases  where  one  run  of
+       $max_repeat [5]
+              The  maximum  number  of  times  latexmk will run latex/pdflatex
+              before deciding that there may be an infinite loop and  that  it
+              needs to bail out, rather than rerunning latex/pdflatex again to
+              resolve cross-references, etc.  The  default  value  covers  all
+              normal cases.
+
+              (Note  that  the  "etc"  covers  a lot of cases where one run of
               latex/pdflatex generates files to be read in on a later run.)
 
        $MSWin_back_slash [1]
-              This  configuration  variable only has an effect when latexmk is
+              This configuration variable only has an effect when  latexmk  is
               running under MS-Windows.  It determines whether, when a command
-              is  executed  under  MS-Windows, there should be substituted "\"
-              for the separator character between components  of  a  directory
-              name.   Internally, latexmk uses "/" for the directory separator
+              is executed under MS-Windows, there should  be  substituted  "\"
+              for  the  separator  character between components of a directory
+              name.  Internally, latexmk uses "/" for the directory  separator
               character, which is the character used by Unix-like systems.
 
               For many programs under MS-Windows, both "\" and "/" are accept-
-              able  as  the  directory separator character.  But some programs
-              only accept "\" on the command  line.   So  for  safety  latexmk
-              makes  a  translation, by default.  It is conceivable that under
+              able as the directory separator character.   But  some  programs
+              only  accept  "\"  on  the  command line.  So for safety latexmk
+              makes a translation, by default.  It is conceivable  that  under
               certain situations this is undesirable, so the configuration can
               be changed.  (A possible example might be when some of the soft-
-              ware is implemented using Cygwin,  which  provides  a  Unix-like
+              ware  is  implemented  using  Cygwin, which provides a Unix-like
               environment inside MS-Windows.)
 
        $new_viewer_always [0]
-              This  variable  applies  to  latexmk  only in continuous-preview
+              This variable applies  to  latexmk  only  in  continuous-preview
               mode.  If $new_viewer_always is 0, latexmk will check for a pre-
-              viously  running  previewer on the same file, and if one is run-
-              ning will not start a new one.  If  $new_viewer_always  is  non-
-              zero,  this check will be skipped, and latexmk will behave as if
+              viously running previewer on the same file, and if one  is  run-
+              ning  will  not  start a new one.  If $new_viewer_always is non-
+              zero, this check will be skipped, and latexmk will behave as  if
               no viewer is running.
 
        $out_dir [""]
-              If non-blank, this variable specifies  the  directory  in  which
+              If  non-blank,  this  variable  specifies the directory in which
               output files are to be written by a run of (pdf)latex.  See also
               the variable $aux_dir.
 
-              The effect of this variable  (when  non-blank)  is  achieved  by
-              using  the  -output-directory option of (pdf)latex.  This exists
-              in the usual current (Dec. 2011 and  later)  implementations  of
-              TeX,  i.e.,  MiKTeX  and  TeXLive.  But it may not be present in
+              The  effect  of  this  variable  (when non-blank) is achieved by
+              using the -output-directory option of (pdf)latex.   This  exists
+              in  the  usual  current (Dec. 2011 and later) implementations of
+              TeX, i.e., MiKTeX and TeXLive. But it  may  not  be  present  in
               other versions.
 
-              If you also use the -cd option, and $out_dir (or $aux_dir)  con-
-              tains  a relative path, then the path is interpreted relative to
+              If  you also use the -cd option, and $out_dir (or $aux_dir) con-
+              tains a relative path, then the path is interpreted relative  to
               the document directory.
 
-              Commonly, the directory specified for output files is  a  subdi-
+              Commonly,  the  directory specified for output files is a subdi-
               rectory of the current working directory.  However, if you spec-
-              ify some other directory, e.g., "/tmp/foo"  or  "../output",  be
-              aware  that  this  could cause problems, e.g., with makeindex or
-              bibtex.  This is because modern versions of these  programs,  by
-              default,  will refuse to work when they find that they are asked
-              to write to a file in a directory that appears  not  to  be  the
-              current working directory or one of its subdirectories.  This is
-              part of security measures by the whole TeX system  that  try  to
-              prevent malicious or errant TeX documents from incorrectly mess-
-              ing with a user's files.  If for $out_dir or $aux_dir you really
+              ify  some  other  directory, e.g., "/tmp/foo" or "../output", be
+              aware that this could cause problems, e.g.,  with  makeindex  or
 
 
 
-                               12 December 2017                             40
+                                17 January 2018                             41
 
 
 
@@ -2644,34 +2710,41 @@
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-              do  need to specify an absolute pathname (e.g., "/tmp/foo") or a
+              bibtex.   This  is because modern versions of these programs, by
+              default, will refuse to work when they find that they are  asked
+              to  write  to  a  file in a directory that appears not to be the
+              current working directory or one of its subdirectories.  This is
+              part  of  security  measures by the whole TeX system that try to
+              prevent malicious or errant TeX documents from incorrectly mess-
+              ing with a user's files.  If for $out_dir or $aux_dir you really
+              do need to specify an absolute pathname (e.g., "/tmp/foo") or  a
               path (e.g., "../output") that includes a higher-level directory,
-              and  you  need to use makeindex or bibtex, then you need to dis-
-              able the security measures (and assume any risks).  One  way  of
+              and you need to use makeindex or bibtex, then you need  to  dis-
+              able  the  security measures (and assume any risks).  One way of
               doing this is to temporarily set an operating system environment
-              variable openout_any to "a"  (as  in  "all"),  to  override  the
+              variable  openout_any  to  "a"  (as  in  "all"), to override the
               default "paranoid" setting.
 
        $pdf_mode [0]
-              If  zero,  do  NOT  generate  a pdf version of the document.  If
-              equal to 1, generate a pdf version of the document using  pdfla-
-              tex,  using the command specified by the $pdflatex variable.  If
-              equal to 2, generate a pdf version of the document from  the  ps
-              file,  by  using  the command specified by the $ps2pdf variable.
-              If equal to 3, generate a pdf version of the document  from  the
-              dvi  file,  by  using the command specified by the $dvipdf vari-
-              able.  If equal to 4, generate a pdf  version  of  the  document
-              using  lualatex,  using  the  command specified by the $lualatex
-              variable.  If equal to 5, generate a pdf  version  (and  an  xdv
+              If zero, do NOT generate a pdf  version  of  the  document.   If
+              equal  to 1, generate a pdf version of the document using pdfla-
+              tex, using the command specified by the $pdflatex variable.   If
+              equal  to  2, generate a pdf version of the document from the ps
+              file, by using the command specified by  the  $ps2pdf  variable.
+              If  equal  to 3, generate a pdf version of the document from the
+              dvi file, by using the command specified by  the  $dvipdf  vari-
+              able.   If  equal  to  4, generate a pdf version of the document
+              using lualatex, using the command  specified  by  the  $lualatex
+              variable.   If  equal  to  5, generate a pdf version (and an xdv
               version) of the document using xelatex, using the commands spec-
               ified by the $xelatex and xdvipdfmx variables.
 
-              In $pdf_mode=2, it is ensured that dvi and  ps  files  are  also
-              made.   In  $pdf_mode=3,  it  is ensured that a dvi file is also
+              In  $pdf_mode=2,  it  is  ensured that dvi and ps files are also
+              made.  In $pdf_mode=3, it is ensured that a  dvi  file  is  also
               made.
 
        $pdflatex ["pdflatex %O %S"]
-              The LaTeX processing program in a version that makes a pdf  file
+              The  LaTeX processing program in a version that makes a pdf file
               instead of a dvi file.
 
               An example use of this variable is to add certain options to the
@@ -2679,103 +2752,105 @@
 
                    $pdflatex = "pdflatex --shell-escape %O %S";
 
-              (In some earlier versions of  latexmk,  you  needed  to  use  an
-              assignment  to $pdflatex to allow the use of lualatex or xelatex
+              (In  some  earlier  versions  of  latexmk,  you needed to use an
+              assignment to $pdflatex to allow the use of lualatex or  xelatex
               instead of pdflatex.  There are now separate configuration vari-
-              ables  for  the  use  of lualatex or xelatex.  See $lualatex and
+              ables for the use of lualatex or  xelatex.   See  $lualatex  and
               $xelatex.)
 
        %pdflatex_input_extensions
-              This variable specifies the extensions tried by latexmk when  it
-              finds  that  a pdflatex run resulted in an error that a file has
-              not been found, and the file  is  given  without  an  extension.
-              This   typically   happens  when  LaTeX  commands  of  the  form
+              This  variable specifies the extensions tried by latexmk when it
+              finds that a pdflatex run resulted in an error that a  file  has
+              not  been  found,  and  the  file is given without an extension.
+              This  typically  happens  when  LaTeX  commands  of   the   form
               \input{file}  or  \includegraphics{figure},  when  the  relevant
-              source file does not exist.
 
-              In  this  situation, latexmk searches for custom dependencies to
-              make the missing file(s), but restricts  it  to  the  extensions
-              specified   by  the  variable  %pdflatex_input_extensions.   The
-              default extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
 
+                                17 January 2018                             42
 
 
-                               12 December 2017                             41
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+              source file does not exist.
 
+              In this situation, latexmk searches for custom  dependencies  to
+              make  the  missing  file(s),  but restricts it to the extensions
+              specified  by  the  variable  %pdflatex_input_extensions.    The
+              default extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
               See details of the %latex_input_extensions for other information
               that equally applies to %pdflatex_input_extensions.
 
        $pdflatex_silent_switch ["-interaction=batchmode"]
-              Switch(es)  for  the pdflatex program (specified in the variable
+              Switch(es) for the pdflatex program (specified in  the  variable
               $pdflatex) when silent mode is on.
 
-              See details of the $latex_silent_switch  for  other  information
+              See  details  of  the $latex_silent_switch for other information
               that equally applies to $pdflatex_silent_switch.
 
        $pdf_previewer ["start acroread %O %S"]
               The command to invoke a pdf-previewer.
 
-              On  MS-Windows,  the  default  is  changed to "cmd /c start """;
+              On MS-Windows, the default is changed  to  "cmd  /c  start  """;
               under more recent versions of Windows, this will cause to be run
               whatever command the system has associated with .pdf files.  But
-              this may be undesirable if this association is  to  acroread  --
+              this  may  be  undesirable if this association is to acroread --
               see the notes in the explanation of the -pvc option.]
 
-              On  OS-X  the  default is changed to "open %S", which results in
-              OS-X starting up (and detaching) the viewer associated with  the
-              file.   By  default, for pdf files this association is to OS-X's
+              On OS-X the default is changed to "open %S",  which  results  in
+              OS-X  starting up (and detaching) the viewer associated with the
+              file.  By default, for pdf files this association is  to  OS-X's
               preview, which is quite satisfactory.
 
-              WARNING:  Problem under MS-Windows: if acroread is used  as  the
-              pdf  previewer,  and  it is actually viewing a pdf file, the pdf
-              file cannot be updated.  Thus makes acroread  a  bad  choice  of
-              previewer  if you use latexmk's previous-continuous mode (option
-              -pvc) under MS-windows.  This problem does  not  occur  if,  for
+              WARNING:   Problem  under MS-Windows: if acroread is used as the
+              pdf previewer, and it is actually viewing a pdf  file,  the  pdf
+              file  cannot  be  updated.   Thus makes acroread a bad choice of
+              previewer if you use latexmk's previous-continuous mode  (option
+              -pvc)  under  MS-windows.   This  problem does not occur if, for
               example, SumatraPDF or gsview is used to view pdf files.
 
-              Important  note:  Normally you will want to have a previewer run
+              Important note: Normally you will want to have a  previewer  run
               detached, so that latexmk doesn't wait for the previewer to ter-
-              minate  before continuing its work.  So normally you should pre-
-              fix the command by "start ", which  flags  to  latexmk  that  it
-              should  do  the  detaching  of the previewer itself (by whatever
-              method is appropriate to the operating system).   But  sometimes
+              minate before continuing its work.  So normally you should  pre-
+              fix  the  command  by  "start  ", which flags to latexmk that it
+              should do the detaching of the  previewer  itself  (by  whatever
+              method  is  appropriate to the operating system).  But sometimes
               letting latexmk do the detaching is not appropriate (for a vari-
-              ety of non-trivial reasons), so you should put the "start "  bit
+              ety  of non-trivial reasons), so you should put the "start " bit
               in yourself, whenever it is needed.
 
        $pdf_update_command [""]
-              When  the  pdf  previewer is set to be updated by running a com-
-              mand, this is the command that is run.  See the information  for
+              When the pdf previewer is set to be updated by  running  a  com-
+              mand,  this is the command that is run.  See the information for
               the variable $pdf_update_method.
 
-       $pdf_update_method [1 under UNIX, 3 under MS-Windows]
-              How  the  pdf  viewer  updates its display when the pdf file has
-              changed. See the information on the variable  $dvi_update_method
-              for the codes.  (Note that information needs be changed slightly
-              so that for the value 4, to run a command to do the update,  the
-              command  is  specified  by the variable $pdf_update_command, and
-              for the value 2, to specify update  by  signal,  the  signal  is
-              specified by $pdf_update_signal.)
 
 
 
-                               12 December 2017                             42
 
+                                17 January 2018                             43
 
 
 
 
+
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+       $pdf_update_method [1 under UNIX, 3 under MS-Windows]
+              How the pdf viewer updates its display when  the  pdf  file  has
+              changed.  See the information on the variable $dvi_update_method
+              for the codes.  (Note that information needs be changed slightly
+              so  that for the value 4, to run a command to do the update, the
+              command is specified by the  variable  $pdf_update_command,  and
+              for  the  value  2,  to  specify update by signal, the signal is
+              specified by $pdf_update_signal.)
+
               Note that acroread under MS-Windows (but not UNIX) locks the pdf
               file, so the default value is then 3.
 
@@ -2786,84 +2861,83 @@
                   $pdf_update_method = 4;
                   $pdf_update_command = "xpdf -remote %R -reload";
 
-              The  first  setting  arranges for the xpdf program to be used in
-              its "remote server mode", with the server name specified as  the
-              rootname  of  the  TeX  file.   The  second setting arranges for
+              The first setting arranges for the xpdf program to  be  used  in
+              its  "remote server mode", with the server name specified as the
+              rootname of the TeX  file.   The  second  setting  arranges  for
               updating to be done in response to a command, and the third set-
               ting sets the update command.
 
-       $pdf_update_signal  [Under  UNIX:  SIGHUP,  which is a system-dependent
+       $pdf_update_signal [Under UNIX: SIGHUP,  which  is  a  system-dependent
        value]
-              The number of the signal that is sent to the pdf viewer when  it
-              is  updated  by  sending  a signal -- see the information on the
-              variable $pdf_update_method.   The  default  value  is  the  one
+              The  number of the signal that is sent to the pdf viewer when it
+              is updated by sending a signal -- see  the  information  on  the
+              variable  $pdf_update_method.   The  default  value  is  the one
               appropriate for gv on a UNIX system.
 
        $pid_position[1 under UNIX, -1 under MS-Windows]
-              The  variable  $pid_position  is  used  to specify which word in
-              lines of the output from $pscmd corresponds to the  process  ID.
-              The  first word in the line is numbered 0.  The default value of
+              The variable $pid_position is used  to  specify  which  word  in
+              lines  of  the output from $pscmd corresponds to the process ID.
+              The first word in the line is numbered 0.  The default value  of
               1 (2nd word in line) is correct for Solaris 2.6, Linux, and OS-X
               with their default settings of $pscmd.
 
-              Setting  the  variable  to -1 is used to indicate that $pscmd is
+              Setting the variable to -1 is used to indicate  that  $pscmd  is
               not to be used.
 
        $postscript_mode [0]
-              If nonzero, generate  a  postscript  version  of  the  document.
+              If  nonzero,  generate  a  postscript  version  of the document.
               Equivalent to the -ps option.
 
-              If  some  other  request  is made for which a postscript file is
+              If some other request is made for which  a  postscript  file  is
               needed, then $postscript_mode will be set to 1.
 
        $preview_continuous_mode [0]
-              If nonzero, run a previewer to view the document,  and  continue
+              If  nonzero,  run a previewer to view the document, and continue
               running latexmk to keep .dvi up-to-date.  Equivalent to the -pvc
-              option.  Which previewer is run depends on the  other  settings,
+              option.   Which  previewer is run depends on the other settings,
               see the command line options -view=, and the variable $view.
 
-       $preview_mode [0]
-              If nonzero, run a previewer to preview the document.  Equivalent
-              to the -pv option.  Which previewer is run depends on the  other
-              settings,  see the command line options -view=, and the variable
-              $view.
 
-       $printout_mode [0]
-              If nonzero, print the document using the  command  specified  in
 
+                                17 January 2018                             44
 
 
-                               12 December 2017                             43
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+       $preview_mode [0]
+              If nonzero, run a previewer to preview the document.  Equivalent
+              to  the -pv option.  Which previewer is run depends on the other
+              settings, see the command line options -view=, and the  variable
+              $view.
 
-
+       $printout_mode [0]
+              If  nonzero,  print  the document using the command specified in
               the $lpr variable.  Equivalent to the -p option.  This is recom-
-              mended not to be set from an RC file, otherwise you could  waste
+              mended  not to be set from an RC file, otherwise you could waste
               lots of paper.
 
        $print_type = ["auto"]
-              Type  of  file  to  printout:  possibilities  are "auto", "dvi",
+              Type of file  to  printout:  possibilities  are  "auto",  "dvi",
               "none", "pdf", or "ps".   See the option -print= for the meaning
               of the "auto" value.
 
        $pscmd Command used to get all the processes currently run by the user.
-              The -pvc option uses  the  command  specified  by  the  variable
-              $pscmd  to  determine  if there is an already running previewer,
-              and to find the process ID (needed if latexmk  needs  to  signal
+              The  -pvc  option  uses  the  command  specified by the variable
+              $pscmd to determine if there is an  already  running  previewer,
+              and  to  find  the process ID (needed if latexmk needs to signal
               the previewer about file changes).
 
               Each line of the output of this command is assumed to correspond
-              to one process.  See the  $pid_position  variable  for  how  the
+              to  one  process.   See  the  $pid_position variable for how the
               process number is determined.
 
-              The  default  for  pscmd  is  "NONE" under MS-Windows and cygwin
-              (i.e., the command is not used), "ps -ww  -u  $ENV{USER}"  under
-              OS-X,  and  "ps  -f -u $ENV{USER}" under other operating systems
+              The default for pscmd is  "NONE"  under  MS-Windows  and  cygwin
+              (i.e.,  the  command  is not used), "ps -ww -u $ENV{USER}" under
+              OS-X, and "ps -f -u $ENV{USER}" under  other  operating  systems
               (including Linux).  In these specifications "$ENV{USER}" is sub-
               stituted by the username.
 
@@ -2872,75 +2946,100 @@
 
        $ps_filter [empty]
               The postscript file filter to be run on the newly produced post-
-              script file before other processing.  Equivalent  to  specifying
+              script  file  before other processing.  Equivalent to specifying
               the -pF option.
 
        $ps_previewer ["start gv %O %S", but start %O %S under MS-Windows]
-              The  command  to  invoke a ps-previewer.  (The default under MS-
-              Windows will cause to be run whatever  command  the  system  has
+              The command to invoke a ps-previewer.  (The  default  under  MS-
+              Windows  will  cause  to  be run whatever command the system has
               associated with .ps files.)
 
-              Note  that  gv  could be used with the -watch option updates its
-              display whenever the postscript file changes, whereas  ghostview
-              does  not.  However, different versions of gv have slightly dif-
-              ferent ways of writing this  option.   You  can  configure  this
+              Note that gv could be used with the -watch  option  updates  its
+              display  whenever the postscript file changes, whereas ghostview
+              does not.  However, different versions of gv have slightly  dif-
+              ferent  ways  of  writing  this  option.  You can configure this
               variable appropriately.
 
               WARNING: Linux systems may have installed one (or more) versions
-              of gv under different names, e.g.,  ggv,  kghostview,  etc,  but
-              perhaps not one actually called gv.
+              of  gv  under  different  names, e.g., ggv, kghostview, etc, but
 
-              Important  note:  Normally you will want to have a previewer run
-              detached, so that latexmk doesn't wait for the previewer to ter-
-              minate  before continuing its work.  So normally you should pre-
-              fix the command by "start ", which  flags  to  latexmk  that  it
-              should  do  the  detaching  of the previewer itself (by whatever
-              method is appropriate to the operating system).   But  sometimes
 
 
+                                17 January 2018                             45
 
-                               12 December 2017                             44
 
 
 
 
-
 LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
+              perhaps not one actually called gv.
+
+              Important note: Normally you will want to have a  previewer  run
+              detached, so that latexmk doesn't wait for the previewer to ter-
+              minate before continuing its work.  So normally you should  pre-
+              fix  the  command  by  "start  ", which flags to latexmk that it
+              should do the detaching of the  previewer  itself  (by  whatever
+              method  is  appropriate to the operating system).  But sometimes
               letting latexmk do the detaching is not appropriate (for a vari-
-              ety of non-trivial reasons), so you should put the "start "  bit
+              ety  of non-trivial reasons), so you should put the "start " bit
               in yourself, whenever it is needed.
 
 
-       $ps_previewer_landscape  ["start gv -swap %O %S", but start %O %S under
+       $ps_previewer_landscape ["start gv -swap %O %S", but start %O %S  under
        MS-Windows]
               The command to invoke a ps-previewer in landscape mode.
 
        $ps_update_command [""]
-              When the postscript previewer is set to be updated by running  a
-              command,  this  is the command that is run.  See the information
+              When  the postscript previewer is set to be updated by running a
+              command, this is the command that is run.  See  the  information
               for the variable $ps_update_method.
 
        $ps_update_method [0 under UNIX, 1 under MS-Windows]
-              How the postscript viewer updates its display when the  ps  file
-              has    changed.    See   the   information   on   the   variable
-              $dvi_update_method for the codes.  (Note that information  needs
+              How  the  postscript viewer updates its display when the ps file
+              has   changed.   See   the   information   on    the    variable
+              $dvi_update_method  for the codes.  (Note that information needs
               be changed slightly so that for the value 4, to run a command to
               do  the  update,  the  command  is  specified  by  the  variable
-              $ps_update_command,  and  for  the value 2, to specify update by
+              $ps_update_command, and for the value 2, to  specify  update  by
               signal, the signal is specified by $ps_update_signal.)
 
-       $ps_update_signal [Under UNIX:  SIGHUP,  which  is  a  system-dependent
+       $ps_update_signal  [Under  UNIX:  SIGHUP,  which  is a system-dependent
        value]
-              The  number of the signal that is sent to the pdf viewer when it
-              is updated by sending a signal --  see  $ps_update_method.   The
+              The number of the signal that is sent to the pdf viewer when  it
+              is  updated  by  sending a signal -- see $ps_update_method.  The
               default value is the one appropriate for gv on a UNIX system.
 
+       $pvc_timeout [0]
+              If this variable is nonzero, there will be  a   timeout  in  pvc
+              mode  after  a  period of inactivity.  Inactivity means a period
+              when latexmk has detected no file  changes  and  hence  has  not
+              taken  any  actions  like  compiling the document. The period of
+              inactivity is in the variable $pvc_timeout_mins.
+
+
+       $pvc_timeout_mins [30]
+              The period of inactivity, in minutes, after which pvc mode times
+              out.  This is used if $pvc_timeout is nonzero.
+
        $pvc_view_file_via_temporary [1]
               The same as $always_view_file_via_temporary, except that it only
               applies in preview-continuous mode (-pvc option).
 
+
+
+
+
+                                17 January 2018                             46
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        $quote_filenames [1]
               This specifies whether substitutions for placeholders in command
               specifications  (as  in  $pdflatex)  are  surrounded  by  double
@@ -2961,21 +3060,9 @@
               of  this option results in a file of extension .fls containing a
               list of the files that these programs  have  read  and  written.
               Latexmk  will  then  use  this  file to improve its detection of
-              source files and  generated  files  after  a  run  of  latex  or
+              source files and generated files after a run of latex or  pdfla-
+              tex.
 
-
-
-                               12 December 2017                             45
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
-              pdflatex.
-
               It  is generally recommended to use this option (or to configure
               the $recorder  variable  to  be  on.)   But  it  only  works  if
               (pdf)latex supports the -recorder option, which is true for most
@@ -3007,6 +3094,18 @@
               operating systems (including Linux and OS-X) is  ':'.   Normally
               the  defaults give correct behavior.  But there can be difficul-
               ties if your operating system is of one kind, but some  of  your
+
+
+
+                                17 January 2018                             47
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
               software  is  running  under  an  emulator for the other kind of
               operating system; in that case you'll need to find out  what  is
               needed,  and  set  $search_path_separator explicitly.  (The same
@@ -3028,18 +3127,6 @@
               -silence_logfile_warning_list and -silence_logfile_warning_list-
               also set this variable.
 
-
-
-
-                               12 December 2017                             46
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
               Note that multiple occurrences for the same undefined object  on
               the same page and same line will be compressed to a single warn-
               ing.
@@ -3073,6 +3160,18 @@
               Directory  to  store  temporary  files that latexmk may generate
               while running.
 
+
+
+
+                                17 January 2018                             48
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
               The default  under  MSWindows  (including  cygwin),  is  to  set
               $tmpdir  to  the  value  of the first of whichever of the system
               environment variables TMPDIR or TEMP exists,  otherwise  to  the
@@ -3095,17 +3194,6 @@
               do this.  The intent of calling make from latexmk is  merely  to
               detect dependencies.
 
-
-
-                               12 December 2017                             47
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        $view ["default"]
               Which  kind  of  file is to be previewed if a previewer is used.
               The possible values are  "default",  "dvi",  "ps",  "pdf".   The
@@ -3139,6 +3227,17 @@
               specified   by   the  variable  %xelatex_input_extensions.   The
               default extensions are 'tex', 'pdf', 'jpg, and 'png'.
 
+
+
+                                17 January 2018                             49
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
               See details of the %latex_input_extensions for other information
               that equally applies to %xelatex_input_extensions.
 
@@ -3159,19 +3258,6 @@
        in the .tex file.
 
 
-
-
-
-
-                               12 December 2017                             48
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
    Defining a custom dependency:
        The old method of configuring latexmk to use a custom dependency was to
        directly  manipulate  the @cus_dep_list array that contains information
@@ -3205,11 +3291,23 @@
               The name of the subroutine that latexmk should call  to  perform
               the  file  conversion.   The first argument to the subroutine is
               the base name of the file to be converted without any extension.
-              The  subroutines  are declared in the syntax of Perl.  The func-
-              tion should return 0 if it was successful and a  nonzero  number
-              if it failed.
+              The  subroutines  are  declared  in  the  syntax  of  Perl.  The
 
 
+
+                                17 January 2018                             50
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+              function should return 0 if it was successful and a nonzero num-
+              ber if it failed.
+
+
        Naturally  add_cus_dep adds a custom dependency with the specified from
        and to extensions.  If a custom dependency has been previously  defined
        (e.g.,  in an rcfile that was read earlier), then it is replaced by the
@@ -3226,18 +3324,6 @@
        extension is the to-extension of a  custom  dependency.   Then  latexmk
        examines  whether a file exists with the same name, but with the corre-
        sponding from-extension, as specified in  the  custom-dependency  rule.
-
-
-
-                               12 December 2017                             49
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        If it does, then the rule is invoked whenever the destination file (the
        one with the to-extension) is out-of-date with respect  to  the  corre-
        sponding source file.
@@ -3272,6 +3358,18 @@
        extension  "fig",  as  created  by the xfig program, to an encapsulated
        postscript file, with extension "eps".  The remaining  lines  define  a
        subroutine  that  carries out the conversion.  If a rule for converting
+
+
+
+                                17 January 2018                             51
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        "fig" to "eps" files already exists (e.g., from  a  previously  read-in
        initialization  file),  the latexmk will delete this rule before making
        the new one.
@@ -3292,18 +3390,6 @@
        return  value  is  the value returned by the last (and only) statement,
        i.e., the invocation of system, which returns the value 0 on success.
 
-
-
-
-                               12 December 2017                             50
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        If you use pdflatex instead of latex, then you will probably prefer  to
        convert  your  graphics  files  to  pdf format, in which case you would
        replace the above code in an initialization file by
@@ -3340,6 +3426,16 @@
        need it.
 
 
+
+                                17 January 2018                             52
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
    Removing custom dependencies, and when you might need to do this:
        If you have some general custom dependencies defined in the  system  or
        user  initialization  file,  you may find that for a particular project
@@ -3358,18 +3454,6 @@
 
            show_cus_dep();
 
-
-
-
-                               12 December 2017                             51
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        in an initialization file.
 
 
@@ -3407,6 +3491,17 @@
            }
            push @generated_exts, 'ndx', 'nnd';
 
+
+
+                                17 January 2018                             53
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        Notice the added line compared with earlier examples.  The  extra  line
        gets the extensions "ndx" and "nnd" added to the list of extensions for
        generated files; then the extra index files will be deleted by clean-up
@@ -3424,18 +3519,6 @@
            }
            push @generated_exts, 'ndx', 'nnd', 'adx', 'and';
 
-
-
-
-                               12 December 2017                             52
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        You could also instead use
 
            add_cus_dep( 'ndx', 'nnd', 0, 'dx2nd' );
@@ -3474,6 +3557,17 @@
        item, and the name of the subroutine for the custom dependency.   These
        were all defined above.
 
+
+
+                                17 January 2018                             54
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        An example of the old method of defining custom dependencies is as fol-
        lows. It is the code in an RC file to ensure  automatic  conversion  of
        .fig files to .eps files:
@@ -3490,18 +3584,6 @@
 
 
 
-
-
-
-                               12 December 2017                             53
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
 ADVANCED CONFIGURATION: Some extra resources and advanced tricks
        For most purposes, simple configuration for latexmk along the lines  of
        the  examples  given  is  sufficient.  But sometimes you need something
@@ -3539,6 +3621,19 @@
               This gives the name of the primary source file.  Note the double
               dollar signs.
 
+
+
+
+
+                                17 January 2018                             55
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        $$Pdest
               This  gives  the  name of the main output file if any.  Note the
               double dollar signs.
@@ -3556,18 +3651,6 @@
               example_rcfiles  of latexmk's distribution.  Currently the cases
               that  use  this   subroutine   are   bib2gls-latexmkrc,   excel-
               tex_latexmkrc  and  texinfo-latexmkrc.  These illustrate typical
-
-
-
-                               12 December 2017                             54
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
               cases where latexmk's normal processing fails to detect  certain
               extra source files.
 
@@ -3605,6 +3688,18 @@
        gram for complex projects, as for software development, with the depen-
        dencies specified by a Makefile.
 
+
+
+
+                                17 January 2018                             56
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        Now  the  basic  task  of latexmk is to run the appropriate programs to
        make a viewable version of a LaTeX document.  However, the  usual  make
        program  is not suited to this purpose for at least two reasons.  First
@@ -3623,17 +3718,6 @@
        as created by the xfig program).   Custom  dependencies  are  latexmk's
        equivalent of pattern rules in Makefiles.
 
-
-
-                               12 December 2017                             55
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        Nevertheless  there  are  projects for which a Makefile is appropriate,
        and it is useful to know how to use latexmk from a Makefile.  A typical
        example  would  be  to  generate  documentation for a software project.
@@ -3669,9 +3753,21 @@
        try.pdf.  So when make is invoked, by default it  makes  try.pdf.   The
        only  complication  is  that  there  may  be  many  source files beyond
        try.tex, but these aren't specified in the Makefile, so changes in them
-       will  not by themselves cause latexmk to be invoked.  Instead, the pat-
-       tern rule is equipped with a "phony" prerequisite FORCE_MAKE; this  has
-       the  effect  of  causing  the  rule  to  be always out-of-date, so that
+       will  not  by  themselves  cause  latexmk  to be invoked.  Instead, the
+
+
+
+                                17 January 2018                             57
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
+       pattern rule is equipped with a "phony" prerequisite  FORCE_MAKE;  this
+       has  the  effect  of causing the rule to be always out-of-date, so that
        latexmk is always run.  It is latexmk that decides whether  any  action
        is  needed,  e.g., a rerun of pdflatex.  Effectively the Makefile dele-
        gates all decisions to latexmk, while make has no knowledge of the list
@@ -3688,18 +3784,6 @@
             DEPS_DIR = .deps
             LATEXMK = latexmk -recorder -use-make -deps \
                   -e 'warn qq(In Makefile, turn off custom dependencies\n);' \
-
-
-
-                               12 December 2017                             56
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
                   -e '@cus_dep_list = ();' \
                   -e 'show_cus_dep();'
             all : $(TARGETS)
@@ -3736,6 +3820,18 @@
 
        Suppose in the LaTeX file there is a  command  \includegraphics{graph},
        and  an xfig file "graph.fig" exists.  On a first run, pdflatex reports
+
+
+
+                                17 January 2018                             58
+
+
+
+
+
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
+
+
        a missing file, named "graph". Latexmk succeeds in  making  "graph.pdf"
        by calling "make graph.pdf", and after completion of its work, it lists
        "fig.pdf" among the dependents of the file latexmk is making.  Then let
@@ -3755,17 +3851,6 @@
        manually refresh (or reopen) display.  Or use one of the other preview-
        ers and update methods.
 
-
-
-                               12 December 2017                             57
-
-
-
-
-
-LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
-
-
        (The following isn't really a bug, but concerns  features  of  preview-
        ers.)   Preview  continuous mode only works perfectly with certain pre-
        viewers: Xdvi on UNIX/Linux works for  dvi  files.   Gv  on  UNIX/Linux
@@ -3787,7 +3872,7 @@
 
 AUTHOR
        Current version, by John  Collins  (username  jcc8  at  node  psu.edu).
-       (Version 4.54c).
+       (Version 4.55).
 
        Released      version      can      be      obtained     from     CTAN:
        <http://www.ctan.org/pkg/latexmk/>,  and  from  the  author's   website
@@ -3804,11 +3889,13 @@
 
 
 
+                                17 January 2018                             59
 
 
 
 
 
+LATEXMK(1)                  General Commands Manual                 LATEXMK(1)
 
 
 
@@ -3823,6 +3910,51 @@
 
 
 
-                               12 December 2017                             58
 
 
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+                                17 January 2018                             60
+
+

Modified: trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl
===================================================================
--- trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl	2018-01-18 23:25:24 UTC (rev 46377)
+++ trunk/Master/texmf-dist/scripts/latexmk/latexmk.pl	2018-01-18 23:25:58 UTC (rev 46378)
@@ -121,8 +121,8 @@
 
 $my_name = 'latexmk';
 $My_name = 'Latexmk';
-$version_num = '4.54c';
-$version_details = "$My_name, John Collins, 12 Dec. 2017";
+$version_num = '4.55';
+$version_details = "$My_name, John Collins, 17 Jan. 2018";
 
 use Config;
 use File::Basename;
@@ -183,7 +183,7 @@
    warn "Something wrong with the perl configuration: No signals?\n";
 }
 
-## Copyright John Collins 1998-2017
+## Copyright John Collins 1998-2018
 ##           (username jcc8 at node psu.edu)
 ##      (and thanks to David Coppit (username david at node coppit.org) 
 ##           for suggestions) 
@@ -221,107 +221,21 @@
 ##
 ##   12 Jan 2012 STILL NEED TO DOCUMENT some items below
 ##
+##    17 Jan 2018   John Collins  Version number to 4.55.  Ready for release.
+##    15, 16 Jan 2018   John Collins  Correct bug in measuring filetime offset.
+##    14 Jan 2018   John Collins  Correct issue with possible filetime offset
+##                                  on remote file system.
+##                                Define defaults for configuration variables
+##                                  that didn't have defaults.
+##    12 Jan 2018   John Collins  Implement pvc timeout
+##    10 Jan 2018   John Collins  Ensure $search_path_separator is defined.
+##                                Set it to MS-Win value for msys.
 ##    12 Dec 2017   John Collins  Further correct bsd_glob fudge (to be in subroutine my_glob)
 ##     8 Dec 2017   John Collins  Correct bsd_glob fudge
 ##     2 Dec 2017   John Collins  Fudge on bsd_glob if it doesn't exist
 ##    20 Nov 2017   John Collins  Ver. 4.54
-##    18 Nov 2017   John Collins  Add item to @file_not_found for generic
-##                                  package warning about "No file", as produced
-##                                  by glossaries-extra.
-##                                In run_bibtex, make change in environment
-##                                  be local, not global.
-##     4 Sep 2017   John Collins  Restore default of $analyze_input_log_always 
-##                                  to 1.  This restores the default detection
-##                                  of certain constructs for dependencies for
-##                                  input files in the .log file. See the
-##                                  comments on this variable.  This corrects
-##                                  a problem caused by a change in the
-##                                  behavior of lualatex in TeXLive 2017.
-##     2 Sep 2017   John Collins  Remove insertion of name of deps file in
-##                                  list of targets in deps file.
-##                                Don't print deps info in deps mode (unless
-##                                  diagnostics on).
-##     1 Sep 2017   John Collins  Customized default previewers for MSys
-##    14 Jul 2017   John Collins  Correct collection of timing information so 
-##                                  that it works even in silent mode
-##    14 Jun 2017   John Collins  Extra value for $bibtex_use
-##    12 Jun 2017   John Collins  Change glob to bsd_glob, since
-##                                  File::Glob's glob is now deprecated.
-##                                Remove unused glob_list.
-##    16 May 2017   John Collins  Optimize away current directory string in
-##                                  $out_dir and $aux_dir.
-##    15 May 2017   John Collins  Fix incorrect deletion of non-generated
-##                                   aux files.
-##    13 May 2017   John Collins  Correct ordering of list of options given
-##                                  by -help
-##     6 Apr 2017   John Collins  In deps_list, correct bug in identifying
-##                                generated files.  Otherwise, generated files
-##                                may be identified as true source files.
-##    19 Jan 2017   John Collins  Make -jobname work with -pdfxe and -pdflua
-##    18 Jan 2017   John Collins  Update to v. 4.53.
-##    17 Jan 2017   John Collins  Update to v. 4.52b (official release).
-##                                Fix bbl file detection bug.
-##                                Bbl files were previously only identified
-##                                  from occurrence as input files in log
-##                                  file rather than from fls as well.
-##    16 Jan 2017   John Collins  Clean up
-##                                Add extra item to @file_not_found for
-##                                  xelatex's characteristic message.
-##    14 Jan 2017   John Collins  Fix some diagnostics.
-##                                Detect graphics candidates in log file from
-##                                  <...> constructs.
-##                                Don't look in log file for input files in the
-##                                  (...) and <...> constructs unless forced to
-##                                  by lack of up-to-date fls file.
-##    13 Jan 2017   John Collins  Kpsewhich diagnostics: also if not
-##                                  silent, or when $kpsewhich_show set.
-##                                Optimize calls to kpsewhich to find files
-##                                  given by lines put in log file by
-##                                  graphics package.
-##                                Work around LuaTeX line-wrapping bug.  (LuaTeX 0.95.0)
-##    12 Jan 2017   John Collins  Improve error reporting on failed run.
-##    11 Jan 2017   John Collins  With -diagnositcs, include invocation
-##                                  and results for kpsewhich.
-##     4, 10 Jan 2017  John Collins  Finish fix for read-after-write files
-##     29-31 Dec 2016  John Collins  V. 4.51
-##                                For biber and bibtex rules, included .blg
-##                                   file as extra generated file.
-##                                Similarly for makeindex rule
-##      3 Nov 2016  John Collins  Start to fix problem reported by jfbu
-##                                that with deleted aux file, latexmk
-##                                does too few runs.
-##                                Problems:
-##                                  1. latexmk doesn't create initial
-##                                     dummy aux or fdb when only one
-##                                     fails to exist, but only when
-##                                     both fail to exist.
-##                                  2. latexmk detects the aux file as
-##                                     only read after write, and
-##                                     hence not a true dependent.
-##                                     That is the initial attempt to
-##                                     read, giving a No file message,
-##                                     is not recorded in the fls
-##                                     file.
-##                                First fix: missing aux file => make
-##                                dummy.
-##                                Need better: if source file in fdb
-##                                doesn't exist initially, then it
-##                                should be counted as initially
-##                                read, so not read after write.
-##     18 Oct 2016  John Collins  xelatex support via xdv file for speed.
-##                                lualatex
-##      5 Sep 2016  John Collins  Add routines: rdb_list_source, rdb_set_source
-##     17 Aug 2016  John Collins  Add XDG Base Directory compatibility
-##                                   for per-user rc file
-##      1 May 2016  John Collins  Correct creation of output and aux directories
-##                                to correctly handle relative paths when -cd
-##                                is used.
-##     22 Apr 2016  John Collins  Fix problem of -C not always working correctly
-##                                when compilation was with -pdf and clear was default.
-##                                (Correctly default set of rules in rdb_make_rule_list.)
-##                                Ver. 4.45
 ##
-##   1998-2010, John Collins.  Many improvements and fixes.
+##   1998-2017, John Collins.  Many improvements and fixes.
 ##       See CHANGE-log.txt for full list, and CHANGES for summary
 ##
 ##   Modified by Evan McLean (no longer available for support)
@@ -664,9 +578,8 @@
 ## Current tex's treat extensions like UNIX teTeX:
 $extension_treatment = 'unix';
 
-## Substitute backslashes in file and directory names for
-##  MSWin command line
-$MSWin_back_slash = 1;
+# Viewers.  These are system dependent, so default to none:
+$pdf_previewer = $ps_previewer  = $ps_previewer_landscape  = $dvi_previewer  = $dvi_previewer_landscape = "NONE";
 
 $dvi_update_signal = undef;
 $ps_update_signal = undef;
@@ -682,6 +595,23 @@
                             # If 0, only open a new viewer if no previous
                             #     viewer for the same file is detected.
 
+# Commands for printing are highly system dependent, so default to NONE:
+$lpr = 'NONE $lpr variable is not configured to allow printing of ps files';
+$lpr_dvi = 'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
+$lpr_pdf = 'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
+
+
+# The $pscmd below holds a **system-dependent** command to list running
+# processes.  It is used to find the process ID of the viewer looking at
+# the current output file.  The output of the command must include the
+# process number and the command line of the processes, since the
+# relevant process is identified by the name of file to be viewed.
+# Its use is not essential.
+$pscmd =  'NONE $pscmd variable is not configured to detect running processes';
+$pid_position = -1;     # offset of PID in output of pscmd.  
+                        # Negative means I cannot use ps
+
+
 $quote_filenames = 1;       # Quote filenames in external commands
 
 $del_dir = '';        # Directory into which cleaned up files are to be put.
@@ -729,7 +659,56 @@
                         #   back to a command prompt, while latexmk
                         #   keeps running in the background!
 
+## Substitute backslashes in file and directory names for
+##  MSWin command line
+$MSWin_back_slash = 1;
 
+## Separator of elements in search_path.  Default is unix value
+$search_path_separator = ':'; 
+
+
+# Directory for temporary files.  Default to current directory.
+$tmpdir = ".";
+
+
+# When the aux_dir is on a network share (or the like), its system
+# time may differ from the system time on which latexmk is running.
+# This complicates the tests of whether particular files have been
+# made in a current run of a program or are left over from a previous
+# run.  One test, which is needed under some situations, is that a
+# file was made on a previous run when the files modification time is
+# less than the system time when the program is started.  (See
+# subroutine test_gen_file; this is only needed in a couple of
+# situations.)  The comparison between file and system times must be
+# corrected if there is an offset between system times on the computer
+# running latexmk and the computer hosting the file system containing
+# aux_dir.  The offset is measured in subroutine get_filetime_offset
+# by writing a temporary file; the test only needs to be done once.
+#
+# The following variables are used.  Since the system-independent
+# values of system and file time are only accurate to a second (or 2
+# seconds for FAT file systems), the offset is also accurate only to a
+# second or two.  So thresholds are needed below which differences
+# are insignificant.
+#
+# Note that the making or not making of a file is controlled by the
+# state of the document being compiled and by latexmk's configuration.
+# So a file that is left over from a previous run and not overwritten
+# on the current run will have a file time at least many seconds less
+# than the current time, corresponding to the time scale for a human
+# run-edit-run cycle.
+#
+$filetime_offset_measured = 0;       # Measurement not yet done.
+$filetime_offset = 0;                # Filetime relative to system time.
+$filetime_causality_threshold = 5;   # Threshold for detection of left-over file.
+                                     # Should be non-negative always, and should
+                                     # be bigger than 2 secs if a remote
+                                     # filesystem or network share is used.
+$filetime_offset_report_threshold = 30; # Threshold beyond which filetime offsets
+                                     # are reported; large offsets indicate
+                                     # incorrect system time on at least one system.
+
+
 ################################################################
 
 
@@ -778,23 +757,6 @@
     $dvi_update_method = 1;
     $ps_update_method = 1;
     $pdf_update_method = 3; # acroread locks the pdf file
-    # Use NONE as flag that I am not implementing some commands:
-    $lpr =
-        'NONE $lpr variable is not configured to allow printing of ps files';
-    $lpr_dvi =
-        'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
-    $lpr_pdf =
-        'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
-    # The $pscmd below holds a command to list running processes.  It
-    # is used to find the process ID of the viewer looking at the
-    # current output file.  The output of the command must include the
-    # process number and the command line of the processes, since the
-    # relevant process is identified by the name of file to be viewed.
-    # Its use is not essential.
-    $pscmd = 
-        'NONE $pscmd variable is not configured to detect running processes';
-    $pid_position = -1;     # offset of PID in output of pscmd.  
-                            # Negative means I cannot use ps
 }
 elsif ( $^O eq "cygwin" ) {
     # The problem is a mixed MSWin32 and UNIX environment. 
@@ -893,34 +855,11 @@
     $dvi_update_method = 1;
     $ps_update_method = 1;
     $pdf_update_method = 3; # acroread locks the pdf file
-    # Use NONE as flag that I am not implementing some commands:
-    $lpr =
-        'NONE $lpr variable is not configured to allow printing of ps files';
-    $lpr_dvi =
-        'NONE $lpr_dvi variable is not configured to allow printing of dvi files';
-    $lpr_pdf =
-        'NONE $lpr_pdf variable is not configured to allow printing of pdf files';
-    # The $pscmd below holds a command to list running processes.  It
-    # is used to find the process ID of the viewer looking at the
-    # current output file.  The output of the command must include the
-    # process number and the command line of the processes, since the
-    # relevant process is identified by the name of file to be viewed.
-    # Its use is not essential.
-    # When the OS is detected as cygwin, there are two possibilities:
-    #    a.  Latexmk was run from an NT prompt, but cygwin is in the
-    #        path. Then the cygwin ps command will not see commands
-    #        started from latexmk.  So we cannot use it.
-    #    b.  Latexmk was started within a cygwin environment.  Then
-    #        the ps command works as we need.
-    # Only the user, not latemk knows which, so we default to not
-    # using the ps command.  The user can override this in a
-    # configuration file. 
-    $pscmd = 
-        'NONE $pscmd variable is not configured to detect running processes';
-    $pid_position = -1;     # offset of PID in output of pscmd.  
-                            # Negative means I cannot use ps
 }
 elsif ( $^O eq "msys" ) {
+    $search_path_separator = ';';  # Separator of elements in search_path
+                                   # I think MS-Win value is OK, since
+                                   # msys is running under MS-Win
     $pdf_previewer = q[sh -c 'start %S'];
     $ps_previewer = q[sh -c 'start %S'];
     $dvi_previewer = q[sh -c 'start %S'];
@@ -929,10 +868,8 @@
 }
 else {
     # Assume anything else is UNIX or clone
+    # Do special cases (e.g., linux, darwin (i.e., OS-X)) inside this block.
 
-    ## Configuration parameters:
-
-
     ## Use first existing case for $tmpdir:
     $tmpdir = $ENV{TMPDIR} || '/tmp';
 
@@ -1227,6 +1164,10 @@
 $preview_continuous_mode  = 0;
 $printout_mode = 0;     # Don't print the file
 
+## Control pvc inactivity timeout:
+$pvc_timeout = 0;
+$pvc_timeout_mins = 30;
+
 $show_time = 0;
 @timings = ();
 $processing_time1 = processing_time();
@@ -1726,6 +1667,9 @@
                        $printout_mode = 0; 
                      }
   elsif (/^-pvc-$/)  { $preview_continuous_mode = 0; }
+  elsif (/^-pvctimeout$/) { $pvc_timeout = 1; }
+  elsif (/^-pvctimeout-$/) { $pvc_timeout = 0; }
+  elsif (/^-pvctimeoutmins=(.*)$/) { $pvc_timeout_mins = $1; }
   elsif (/^-recorder$/ ){ $recorder = 1; }
   elsif (/^-recorder-$/ ){ $recorder = 0; }
   elsif (/^-rules$/ ) { $rules_list = 1; }
@@ -2134,6 +2078,13 @@
     add_option( "$dvips_pdf_switch", \$dvips );
 }
 
+# Restrict variables to allowed values:
+
+if ($filetime_causality_threshold < 0) {
+    warn "$My_name: Correcting negative value of \$filetime_causality_threshold to zero.\n";
+    $filetime_causality_threshold = 0;
+}
+
 # Note sleep has granularity of 1 second.
 # Sleep periods 0 < $sleep_time < 1 give zero delay,
 #    which is probably not what the user intended.
@@ -3143,6 +3094,8 @@
 
     # Loop forever, rebuilding .dvi and .ps as necessary.
     # Set $first_time to flag first run (to save unnecessary diagnostics)
+    my $last_action_time = time();
+    my $timed_out = 0;
 CHANGE:
     for (my $first_time = 1; 1; $first_time = 0 ) {
         my %rules_to_watch = %requested_filerules;
@@ -3258,6 +3211,7 @@
 #          latexmk -pvc foo; cleanup;
         &catch_break;
         $have_break = 0;
+        $last_action_time = time();
   WAIT: while (1) {
            sleep( $sleep_time );
            if ($have_break) { last WAIT; }
@@ -3278,6 +3232,10 @@
                last WAIT; 
            }
            if ($have_break) { last WAIT; }
+           if ($pvc_timeout && ( time() > $last_action_time+60*$pvc_timeout_mins ) ) {
+	       $timed_out = 1;
+	       last WAIT;
+           }
      } # end WAIT:
      &default_break;
      if ($have_break) { 
@@ -3284,6 +3242,10 @@
           print "$My_name: User typed ctrl/C or ctrl/break.  I'll finish.\n";
           return;
      }
+     if ($timed_out) {
+         print "$My_name: More than $pvc_timeout_mins mins of inactivity.  I'll finish.\n";
+         return;
+     }
      $waiting = 0; if ($diagnostics) { warn "NOT       WAITING\n"; }
   } #end infinite_loop CHANGE:
 } #END sub make_preview_continuous
@@ -3585,6 +3547,9 @@
   "                on force mode, so errors do not cause $my_name to stop.)\n",
   "            (Side effect: turn off ordinary preview mode.)\n",
   "   -pvc-  - turn off -pvc\n",
+  "   -pvctimeout    - timeout in pvc mode after period of inactivity\n",
+  "   -pvctimeout-   - don't timeout in pvc mode after inactivity\n",
+  "   -pvctimeoutmins=<time> - set period of inactivity (minutes) for pvc timeout\n",
   "   -quiet    - silence progress messages from called programs\n",
   "   -r <file> - Read custom RC file\n",
   "               (N.B. This file could override options specified earlier\n",
@@ -5750,17 +5715,21 @@
 sub test_gen_file {
     # Usage: test_gen_file( filename )
     # Tests whether the file was generated during a run of (pdf)latex.
-    # Used by rdb_set_latex_deps.
-    # Assumes context for primary rule, and that %generated_log is set.
-    # The generated_log test works with TeXLive's tex, because it puts
-    #   \openout lines in log file.
-    # But it doesn't work with MikTeX, which does NOT put \openout lines
-    #   in log file.
-    # So we have a back up test: bcf file exists and is at least as new as
-    #   the run time (so it should have been generated on the current run).
+    # Assumes context for primary rule.
+    # Two kinds of test are used:
+    # a. From %generated_log, which works after the log file has been parsed,
+    #    but only for certain files and for those TeX engines (not MiKTeX)
+    #    that put \openout lines in log file.
+    # b. By the file existing and being at least as new as the system
+    #    time at the start of the run. But we allow for a measured
+    #    offset between filetime and system time, which could be
+    #    nonzero if the file is on a different, remote system than the
+    #    one running latexmk. We must also allow a threshold in the
+    #    comparisons of filetimes to allow for the inaccuracy of the
+    #    offset measurement.
     my $file = shift;
     return exists $generated_log{$file}
-           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time ));
+           || ( -e $file && ( get_mtime( $file ) >= $$Prun_time + $filetime_offset - $filetime_causality_threshold));
 }
 
 #************************************************************
@@ -6785,7 +6754,7 @@
     # Source file data, by definition, correspond to the file state just
     # before the latest run, and the run_time to the time just before the run:
     &rdb_update_files;
-    $$Prun_time = time;
+    $$Prun_time = time();
     $$Pchanged = 0;       # No special changes in files
     $$Plast_result = 0;
     $$Plast_message = '';
@@ -6959,7 +6928,7 @@
     # Source file data, by definition, correspond to the file state just before 
     # the latest run, and the run_time to the time just before the run:
     &rdb_update_files;
-    $$Prun_time = time;
+    $$Prun_time = time();
     $$Pchanged = 0;       # No special changes in files
     $$Plast_result = 0;
     $$Plast_message = '';
@@ -7056,6 +7025,17 @@
     # and then parses log file etc.
     my $return = 0;
 
+    if ( ! $filetime_offset_measured ) {
+	$filetime_offset = get_filetime_offset( $aux_dir1."tmp" );
+	if ( (abs($filetime_offset) > $filetime_offset_report_threshold)
+             && ($diagnostics || ! $silent) )
+        {
+	    warn "$My_name: I am working around an offset relative to my system time by\n",
+                 "   $filetime_offset secs for file times in directory '$aux_dir1'.\n";
+	}
+	$filetime_offset_measured = 1;
+    }
+
     my $return_latex = &rdb_run1;
     if (-e $$Pdest) { $missing_dvi_pdf = '';}
 
@@ -7186,7 +7166,7 @@
     local $ignore_run_time = $_[0];
     if ( ! defined $ignore_run_time ) { $ignore_run_time = 0; }
 
-    $$Pcheck_time = time;
+    $$Pcheck_time = time();
 
     local $dest_mtime = 0;
     $dest_mtime = get_mtime($$Pdest) if ($$Pdest);
@@ -8566,10 +8546,39 @@
 
 #################################
 
+sub get_filetime_offset {
+    # Usage: get_filetime_offset( prefix, [suffix] )
+    # Measures offset between filetime in a directory and system time
+    # Makes a temporary file of a unique name, and deletes in.
+    # Filename is of form concatenation of prefix, an integer, suffix.
+    # Prefix is normally of form dir/ or dir/tmp.
+    # Default default suffix ".tmp".
+    my $prefix = $_[0];
+    my $suffix = $_[1] || '.tmp';
+    my $tmp_file_count = 0;
+    while (1==1) {
+        # Find a new temporary file, and make it.
+        $tmp_file_count++;
+        my $tmp_file = "${prefix}${tmp_file_count}${suffix}";
+        if ( ! -e $tmp_file ) {
+            open( TMP, ">$tmp_file" ) 
+		or die "$My_name.get_filetime_offset: In measuring filetime offset, couldn't write to\n",
+ 		       "    temporary file '$tmp_file'\n";
+	    my $time = time();
+            close(TMP);
+	    my $offset = get_mtime($tmp_file) - $time;
+	    unlink $tmp_file;
+            return $offset;
+         }
+     }
+     die "$My_name.get_filetime_offset: BUG TO ARRIVE HERE\n";
+}
 
+#################################
+
 sub tempfile1 {
     # Makes a temporary file of a unique name.  I could use file::temp,
-    # but it is not present in all versions of perl
+    # but it is not present in all versions of perl.
     # Filename is of form $tmpdir/$_[0]nnn$suffix, where nnn is an integer
     my $tmp_file_count = 0;
     my $prefix = $_[0];



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