Font lock bug in sh-script.el

Font lock bug in sh-script.el

[Richard Stallman]

This shell script

 svrmgrl <<        EOF
     CONNECT INTERNAL
     STARTUP
     EXIT
        EOF

 while
 # foo

seems to confuse sh-script.el's font lock support.
All the text following the first line is treated as a here-document.

Note that all the spaces in this test case are ordinary spaces.
(Someone else reported a bug involving non-breaking spaces.)

Would you please look at this?

Re: Font lock bug in sh-script.el

[Daniel Pfeiffer]

Hi Richard,

Richard Stallman <rms@gnu.org> skribis:
> This shell script

>  svrmgrl <<        EOF
>      CONNECT INTERNAL
>      STARTUP
>      EXIT
>         EOF
> 
>  while
>  # foo

> seems to confuse sh-script.el's font lock support.
> All the text following the first line is treated as a here-document.

That is correct!  Only in the first column does EOF have it's special meaning.

> Note that all the spaces in this test case are ordinary spaces.
> (Someone else reported a bug involving non-breaking spaces.)

Yes, he sent it to me first, and I asked him to send it to the bug list, since I no longer use shell (Perl instead :-).

Anyways, those non-breaking spaces are pretty whacky.  While they work in both bash and pdksh, neither documents what that EOF may look like.  The bash manual calls it a word, so accepting nbsp`s here is almost a bash bug.

As long as there is no specification, all you could do is trial and error, to find the common subset of characters accepted by all shells, or differentiate for each one.  In the latter case I guess you'd be fighting with differences between various commercial ksh`s...

coralament / best Grötens / liebe Grüße / best regards / elkorajn salutojn
Daniel Pfeiffer

-- GPL 3: take the wind out of Palladium's sails! --
 ------
  -- My other stuff here too, sawfish, make.pl...: --
   ------
    -- http://dapfy.bei.t-online.de/ --

Re: Font lock bug in sh-script.el

[Stefan Monnier]

>  svrmgrl <<        EOF
>      CONNECT INTERNAL
>      STARTUP
>      EXIT
>         EOF
> 
>  while
>  # foo
> 
> seems to confuse sh-script.el's font lock support.
> All the text following the first line is treated as a here-document.

I have written this font-lock support, so I'll take care of it,


	Stefan

Re: Font lock bug in sh-script.el

[Stefan Monnier]

> This shell script
> 
>  svrmgrl <<        EOF
>      CONNECT INTERNAL
>      STARTUP
>      EXIT
>         EOF
> 
>  while
>  # foo
> 
> seems to confuse sh-script.el's font lock support.
> All the text following the first line is treated as a here-document.

As mentioned earlier, this is indeed correct.

He should use either

svrmgrl << '	EOF'
     CONNECT INTERNAL
     STARTUP
     EXIT
	EOF

 while
 # foo

or

svrmgrl <<- EOF
     CONNECT INTERNAL
     STARTUP
     EXIT
	EOF

 while
 # foo


- Stefan

Re: Font lock bug in sh-script.el

[Richard Stallman]

    > All the text following the first line is treated as a here-document.

    As mentioned earlier, this is indeed correct.

Thanks for investigating.