bug#36317: [PATCH v2] Allow underscore in defun-prompt-regex names for sh-script

[Ola Nilsson <ola.nilsson@gmail.com>]

On Tue, Jun 25, 2019 at 4:01 PM Noam Postavsky <npostavs@gmail.com> wrote:
>
> Ola Nilsson <ola.nilsson@gmail.com> writes:
>
> > * lisp/progmodes/sh-script.el (defun-prompt-regexp):
> > Allow underscore in function names.
>
> Do you think we should allow dashes as too (as suggested in Bug#21477)?

Bug#21477 will not be fixed by changing defun-prompt-regexp.

sh-script.el does not have a centralized way of dealing with function names.

* imenu (the problem in Bug#21477) does not use defun-prompt-regexp,
but rather its
  own regexp found in sh-imenu-generic-expression.  Funnily enough
those function
  names _do_ follow the posix standard (letters, digits, underscore,
must not start with
  a digit).
* sh-current-defun-name also has its own regexps, matching those of
  sh-imenu-generic-expression.
* sh-font-lock-keyword-var uses "\\sw+" which is a lot less strict with what
  characters can be included.
* sh-completion-at-point-function uses "[[:alnum:]_]" to skip to
beginning and end
  of a function name.

I assume there are some other cases that I missed.

As far as I can tell from a quick search of shell manuals and net
questions most shells stick to the posix spec. Bash is the exception
and seems to be very forgiving at least as long as you use the
'function name() {...}' format.

So I guess it boils down to how allowing we want to be.

-- 
Ola Nilsson