bug#26661: compile, shell etc. should use bash-completion !

[Stefan Kangas]

Kévin Le Gouguec <kevin.legouguec@gmail.com> writes:

> Out of curiosity, couldn't shell-mode (and M-x compile et al.) do what
> python-mode does, i.e. ask the interpreter's "completion API" for
> candidates when the user hits TAB?
>
> I think that's what the "bash-completion" package from MELPA does[1];
> this approach would allow Emacs to leverage Bash's programmable
> completion with no special support for specific commands.
>
>
> (Apologies if I've misunderstood something, I've only very quickly
> glanced at python.el and bash-completion's internals.)
>
>
> [1] 
> https://raw.githubusercontent.com/szermatt/emacs-bash-completion/master/bash-completion.el
>
> See e.g. bash-completion--setup-bash-common which runs "complete -p".

Interesting, I didn't know about that package.  I tested it, and it
seems to do the job.

I think it's interesting as an alternative, but is it suitable as a
default?  For example what happens if you don't have bash-completion
installed on your machine.  IIRC it is a separate package in Debian.

Also, I doubt that it could ever be as powerful as pcomplete.

My preference is that for this use-case we point users to use the
third-party package, but I guess YMMV.  Any other opinions?