[OS X TeX] Emacs 22.92, %! and TeXShop
Peter_Dyballa at Web.DE
Sat Jan 27 11:06:11 CET 2007
Am 27.01.2007 um 04:13 schrieb Charilaos Skiadas:
>>> Isn't there a way to tell emacs to treat all files with extension
>>> "tex" as tex files too?
>> The issue here is that TeXshop's use of %! can make some of its
>> source files incompatible with at least
> Actually for me this is not the issue. The issue, for me, is the
> inability of emacs to understand as a tex file something that is
> plainly and without any doubt a tex file.
You did not pay attention! GNU Emacs does not rely on your
understanding of what "is plainly and without any doubt a tex file."
Because a file contents, with what file name extension ever, that
starts with %! is a PostScript contents. You should learn this fact
starting today, a thing your PostScript printer could tell you at once.
GNU Emacs first looks at the contents of a file – similiar to the
UNIX file command and many other routines, that for example check
whether the binary is executable on this hardware in this software
environment and whether the shared library fits into both. (Just
imagine that you wanted to save file.text and forgot, in a hurry, to
enter the last character or the key was blocked on the keyboard which
did not see or whatever.) And by this means it's also possible to put
at the bottom of the file settings for "local variables" into the
file that determine how this file contents will be treated, or you do
this on the first line, just as TeXShop tries to do it. (And a bit
more is possible, too.)
If this first step fails, then GNU Emacs tries to determine the kind
of file by its extension. Heuristics for both are incorporated into
GNU Emacs. As usual both heuristics can be adapted to local
circumstances or customs. Examples for doing this were given.
This approach is a bit human. At least a few humans are clever and do
not rely as computers do on the primitive idea that one test can
determine everything without error.
TeXShop's usurpation of %! is bad. %? would make more sense: is what
follows the question mark something with a meaning for me, TeXShop?
Some day we may discover how to make magnets that can point in any
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