[tex4ht-commits] [SCM] tex4ht updated: r1158 - trunk/lit

[Michal Hoftich]

Author: michal_h21
Date: 2022-06-21 15:56:07 +0000 (Tue, 21 Jun 2022)
New Revision: 1158

Modified:
   trunk/lit/ChangeLog
   trunk/lit/tex4ht-4ht.tex
Log:
fixed support for the index command inside caption

Modified: trunk/lit/ChangeLog
===================================================================
--- trunk/lit/ChangeLog	2022-06-20 13:49:01 UTC (rev 1157)
+++ trunk/lit/ChangeLog	2022-06-21 15:56:07 UTC (rev 1158)
@@ -1,3 +1,9 @@
+2022-06-21  Michal Hoftich  <michal.h21 at gmail.com>
+
+	* tex4ht-4ht.tex (latex.4ht): fixed support for \index commands
+	inside \caption.
+	https://tex.stackexchange.com/a/647924/2891
+
 2022-06-20  Michal Hoftich  <michal.h21 at gmail.com>
 
 	* tex4ht-4ht.tex (pdfpages.4ht): added support for the Pdfpages

Modified: trunk/lit/tex4ht-4ht.tex
===================================================================
--- trunk/lit/tex4ht-4ht.tex	2022-06-20 13:49:01 UTC (rev 1157)
+++ trunk/lit/tex4ht-4ht.tex	2022-06-21 15:56:07 UTC (rev 1158)
@@ -11487,15 +11487,41 @@
 \`'.lot' (list of tables) and \`'lof'  (list of figures) files.
 
 \<latex ltfloat\><<<
+|<latex caption index|>
 \long\def\:tempc#1[#2]#3{\par \cur:lbl{}%
   |<write caption to toc|>\begingroup
+    |<latex caption index save|>
     \@parboxrestore \normalsize
     \@makecaption{\csname fnum@#1\endcsname}{\ignorespaces #3}\par
-  \endgroup |<cancel if-label anchors|>}
+  \endgroup 
+|<latex caption index print|>
+|<cancel if-label anchors|>}
 \def\numberline#1{\hbox to\@tempdima{#1\hfil} }
 \HLet\@caption|=\:tempc
 >>>
 
+The index commands used inside caption may result in fatal error. 
+We use the LaTeX 3 sequences to save their contents inside caption,
+and print them when it is safe.
+
+\<latex caption index\><<<
+\ExplSyntaxOn
+\seq_new:N\:savedindex
+\def\:initsaveindex{\seq_gclear:N\:savedindex}
+\def\:saveindex#1{\seq_gput_right:Nn\:savedindex{#1}}
+\def\:printsavedindex{\seq_map_inline:Nn\:savedindex{\index{##1}}}
+\ExplSyntaxOff
+>>>
+
+\<latex caption index save\><<<
+\:initsaveindex%
+\let\index\:saveindex%
+>>>
+
+\<latex caption index print\><<<
+\:printsavedindex%
+>>>
+
 The \''|<cancel if-label anchors|>' request no 
 the \''\label' commands to avoid duplicating the anchor already set by the 
 \''\caption' command.