bug#66551: [PATCH] Add completion for Unix 'doas' command.

[Antero Mejr via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Visuwesh <visuweshm@gmail.com> writes:

> Could we not provide completion for -u and -C?  I have the following
> function in my init.el:
>
>     (defun pcomplete/doas ()
>       "Completion for the `doas' command."
>       (when (string-prefix-p "-" (pcomplete-arg 0))
>         (pcomplete-opt "Lnsu(pcmpl-unix-user-names)C(pcomplete-entries nil #'file-regular-p)"))
>       (funcall pcomplete-command-completion-function)
>       (funcall (or (pcomplete-find-completion-function (pcomplete-arg 1))
>                pcomplete-default-completion-function)))
>

Thanks, that is better. However the -C file completion doesn't work for
me unless I reorder the pcomplete-opt flags like this:

;;;###autoload
(defun pcomplete/doas ()
  "Completion for the `doas' command."
  (pcomplete-opt
   "C(pcomplete-entries nil #'file-regular-p)Lnsu(pcmpl-unix-user-names)")
  (funcall pcomplete-command-completion-function)
  (funcall (or (pcomplete-find-completion-function (pcomplete-arg 1))
               pcomplete-default-completion-function)))

The above also lets pcomplete-opt handle the '-' prefix. WDYT?