latexenc and `TeX-master'

[David Reitter]

When trying to load a .tex files with a (faulty) TeX Master directive,
the behavior of latexenc-find-file-coding-system is slightly flawed,
leading to an "Wrong type argument: arrayp, nil" error later-on.

The TeX master file in the .tex file I have is a directory:

%%% Local Variables:
%%% mode: latex
%%% TeX-master: "~/web"
%%% End:

What happens in `latexenc-find-file-coding-system' is that this
directory is loaded (in dired mode). In this buffer, both
`coding-system-for-write' and `buffer-file-coding-system' are nil so
that `latexenc-find-file-coding-system' returns nil instead of
`undecided.

While it seems like the "TeX-master" statement is clearly wrong, I
think Emacs should tolerate that or give a useful error message rather
than bailing out. The patch below takes care of that.



*** latexenc.el 02 Dec 2005 13:24:11 +0000      1.11
--- latexenc.el 22 Jan 2006 08:52:12 +0000      
***************
*** 156,162 ****
                                         "")
                                   ".tex" ".ltx" ".dtx" ".drv"))
                      (if (and (null latexenc-main-file) ;Stop at  
first.
!                              (file-exists-p (concat file ext)))
                          (setq latexenc-main-file (concat file  
ext)))))))
              ;; try tex-modes tex-guess-main-file
              (when (and (not latexenc-dont-use-tex-guess-main-file- 
flag)
--- 156,163 ----
                                         "")
                                   ".tex" ".ltx" ".dtx" ".drv"))
                      (if (and (null latexenc-main-file) ;Stop at  
first.
!                              (file-exists-p (concat file ext))
!                            (not (file-directory-p filename)))
                          (setq latexenc-main-file (concat file  
ext)))))))
              ;; try tex-modes tex-guess-main-file
              (when (and (not latexenc-dont-use-tex-guess-main-file- 
flag)
***************
*** 174,180 ****
                          (find-file-noselect latexenc-main-file t)))
                    (coding-system-base   ;Disregard the EOL part of  
the CS.
                     (with-current-buffer latexenc-main-buffer
!                      (or coding-system-for-write buffer-file-coding- 
system))))
                'undecided))))
      'undecided))

--- 175,183 ----
                          (find-file-noselect latexenc-main-file t)))
                    (coding-system-base   ;Disregard the EOL part of  
the CS.
                     (with-current-buffer latexenc-main-buffer
!                      (or coding-system-for-write
!                        buffer-file-coding-system
!                        'undecided))))
                'undecided))))
      'undecided))