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From: squash@math.ufl.edu (Jonathan King)
Newsgroups: gnu.emacs.help,comp.emacs
Subject: I'd like to always use PlainTeX, not Latex; How?
Message-ID: <SQUASH.90Nov29135216@shadrach.math.ufl.edu>
Date: 29 Nov 90 18:52:16 GMT
Sender: news@mathlab.math.ufl.EDU
Organization: University of Florida Department of Mathematics
Lines: 50

(This is a reposting -the first time apparently did not post (?))

Hello.  

When I visit a file with extension .tex I would like that its buffer
be automatically put in plain-tex-mode, and never in latex-mode.

	-- If you can tell me how to do this, read no further. --


My .emacs file contains
(setq 
 auto-mode-alist 
 '(     ; Determines automatic choice of major mode based on file extension.
   ("\\.tex$" . tex-mode) ("\\.sty$" . tex-mode)
  ...))

When I visit a .tex file, tex-mode apparently looks at the file and
guesses whether it is "plain", or "latex".   Sometimes it guesses
wrong -in my case, whenever it guesses "latex".  To try to make it
choose "plain", I put

(setq tex-default-mode 'plain-tex-mode) 

in .emacs   This solves the problem 90% of the time.

To get a 100% solution I tried

(setq 
 auto-mode-alist 
 '(     ; Determines automatic choice of major mode based on file extension.
   ("\\.tex$" . plain-tex-mode) ("\\.sty$" . plain-tex-mode)
  ...))


*This* failed in a spectacular way.  On our system, the command
tex-mode  is apparently bound to execute something called  cmutex.
Cmutex's keymap is called tex-mode-map (lowercase).  However, the
tex-mode which comes with the standard GNU release is some other
command and *it* uses TeX-mode-map (some uppercase) for its local map.

When I made the above change to auto-mode-alist, cmutex was apparently
*not* called -the other tex mode was, and all of my key binding
naturally broke.

Out of curiosity, I'd like to know why cmutex didn't run.  
Out of practicality, how can I always cause cmutex to be invoked in
its "plain" state-of-mind?

				Jonathan