how to override bad coloring in shell-script-mode?

how to override bad coloring in shell-script-mode?

[Joe Corneli]

The following is a sample from a bash script I've been working on.

  grep "<<$SF>>" $HOME/.todo/$TODOLIST > $HOME/p                                                                                        
  ade=$?                                                                                                                                
  rm $HOME/p                                                                                                                            

Now that I have color in my rxvt, I'm noticing something bad: everything
after the line containing the "<<" is in sh-heredoc-face until the code
comes to another line containing "<<" and ">>".  Note, however, that it is
not the _next_ line containing those strings that stops the yellow tide,
but one rather far along in the code. Then things are normal for a while,
then back to sh-heredoc-face.

This bad behaviour is not present in XEmacs, interestingly enough. 

I'll submit a bug report on this shortly, but in the mean time I'd like to
know how to get Emacs to ignore everything having to do with "here docs".

Thanks,

Joe

Re: how to override bad coloring in shell-script-mode?

[Stefan Monnier]

>   grep "<<$SF>>" $HOME/.todo/$TODOLIST > $HOME/p

It seems indeed to trigger a bug in sh-script in that it doesn't
notice that << is inside quotes (it looks like the bug appears
only if there's nothing between the " and the <<).

> This bad behaviour is not present in XEmacs, interestingly enough. 

I believe XEmacs uses completely different code for that mode.
Does it do anything at all with here documents ?

> I'll submit a bug report on this shortly, but in the mean time I'd like to
> know how to get Emacs to ignore everything having to do with "here docs".

No need to file a bug report, this bug is fixed in the CVS version of Emacs.
In the mean time, you might be able to fix the bug instead, with:

      (defadvice sh-font-lock-heredoc (before bug-fix activate)
        (setq start (1+ start)))

If you prefer to turn it all off try something like:

    (add-hook 'sh-mode-hook
      (lambda ()
        ;; Disable buggy heredoc matching in Emacs-21.[123].
        (defun sh-font-lock-heredoc (&rest r) nil)))


-- Stefan