Re: sh-script.el : don't colorize $(( 4 << 2 )) as here-document

[Lennart Borgman <lennart.borgman@gmail.com>]

On Sat, Nov 21, 2009 at 6:27 PM, Andreas Röhler
<andreas.roehler@easy-emacs.de> wrote:
> Thomas Gambier wrote:
>> Hello,
>>
>> when I'm writing something like this in bash script value=$(( 4 << 2 )),
>> Emacs keep thinking it's the beginning of here-document and will
>> colorize in yellow all the code below this expression.
>>
>> I've seen that a bug in sh-script.el was corrected so that << between ""
>> won't be interpreted as a beginning of here-document
>> (http://lists.gnu.org/archive/html/help-gnu-emacs/2003-06/msg00158.html).
>> Is there any solution to don't consider also << between $(( )) ? I
>> looked into sh-script.el to try to correct it myself but I'm not very at
>> ease with lisp and regular expression and I didn't find what to change.
>> That's why I ask help here. If it's not possible, I will disable the
>> feature as explained in the previous link.
>>
>> Best regards.
>>
>
>
> Hi,
>
> AFAIS it's inside
>
> (defconst sh-here-doc-open-re
>  (concat "<<-?\\s-*\\\\?\\(\\(?:['\"][^'\"]+['\"]\\|\\sw\\)+\\)"
>          sh-escaped-line-re "\\(\n\\)"))
>
> If you say, `sh-here-doc-open-re' must start at bol or
> only permit whitespace before, inserting a ^[ \t]* into
> the regexp
>
> (setq sh-here-doc-open-re
>  (concat "^[ \t]*<<-?\\s-*\\\\?\\(\\(?:['\"][^'\"]+['\"]\\|\\sw\\)+\\)"
>          sh-escaped-line-re "\\(\n\\)"))
>
> it works here.


I have some trouble understanding those regexp. What are the proper
syntax for sh heredoc?

I have some support for it in MuMaMo and just noticed that the example
Andreas mentioned did not work as I expected.