GNU bug report logs - #26661
compile, shell etc. should use bash-completion !

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Package: emacs; Severity: wishlist; Reported by: 積丹尼 Dan Jacobson <jidanni@HIDDEN>; dated Tue, 25 Apr 2017 23:38:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

Removed tag(s) wontfix and notabug. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Did not alter fixed versions and reopened. Request was from Debbugs Internal Request <help-debbugs@HIDDEN> to internal_control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#26661: compile, shell etc. should use bash-completion !
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reopen 26661
tags 26661 - notabug wontfix
thanks

K=C3=A9vin Le Gouguec <kevin.legouguec@HIDDEN> writes:

> Lots of authors of CLI tools now maintain their own completion
> configuration for e.g. Bash and/or Zsh, so by supporting Bash's native
> completion facilities we would leverage their efforts instead of
> re-developing ad-hoc completion functions.
[...]
> I just think the benefit/cost ratio of enabling native Bash
> completions by default seems high.

OK, those are indeed compelling arguments, so I'm re-opening the bug
report.

Maybe we could convince the authors of the bash-completion package to
assign their copyright to the FSF.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

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From: =?utf-8?Q?K=C3=A9vin_Le_Gouguec?= <kevin.legouguec@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#26661: compile, shell etc. should use bash-completion !
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Stefan Kangas <stefan@HIDDEN> writes:

> 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.

IIUC Debian's bash-completion package merely provides configuration for
Bash's native completion facilities (`complete' is just a Bash builtin);
I expect that if it's not installed, the MELPA package will just end up
with an empty list of completion candidates.

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

It would probably have better program coverage though.  Lots of authors
of CLI tools now maintain their own completion configuration for
e.g. Bash and/or Zsh, so by supporting Bash's native completion
facilities we would leverage their efforts instead of re-developing
ad-hoc completion functions.

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

All I can say is that I enjoy python.el offering the interpreter's
native completions, and I wish shell-mode et al. could work the same
way.  Philosophically speaking, it would make sense IMO for one GNU
project (Emacs) to leverage the API offered by another GNU project
(Bash).


I'm not saying pcomplete doesn't deserve some love and we could not
implement smarter completions with it; I just think the benefit/cost
ratio of enabling native Bash completions by default seems high.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

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Subject: Re: bug#26661: compile, shell etc. should use bash-completion !
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K=C3=A9vin Le Gouguec <kevin.legouguec@HIDDEN> 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/mast=
er/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?

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

Message received at 26661 <at> debbugs.gnu.org:

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From: =?utf-8?Q?K=C3=A9vin_Le_Gouguec?= <kevin.legouguec@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
Subject: Re: bug#26661: compile, shell etc. should use bash-completion !
References: <878tmoxdno.fsf@HIDDEN>
 <CADwFkmnsAOt9R95PSjdegD-soAzfvVap13niwiiw4kRNnNK3SA@HIDDEN>
Date: Thu, 03 Sep 2020 00:10:29 +0200
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 (Stefan Kangas's message of "Tue, 1 Sep 2020 16:14:57 -0700")
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 =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
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Stefan Kangas <stefan@HIDDEN> writes:

> I'm also not exactly sure how integrating bash completion with Emacs
> would work.  Bash completion consists of a number of highly
> bash-specific scripts.  It would take significant effort to write an
> Emacs parser for them.
>
> It seems like a better idea for people to spend time on making pcomplete
> extensions for more commands.  But that would be outside the scope of
> this feature request, I think.

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".

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

bug closed, send any further explanations to 26661 <at> debbugs.gnu.org and 積丹尼 Dan Jacobson <jidanni@HIDDEN> Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Added tag(s) notabug and wontfix. Request was from Stefan Kangas <stefan@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 26661 <at> debbugs.gnu.org:

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Subject: Re: bug#26661: compile, shell etc. should use bash-completion !
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tags 26661 + notabug wontfix
close 26661
thanks

=E7=A9=8D=E4=B8=B9=E5=B0=BC Dan Jacobson <jidanni@HIDDEN> writes:

> M-x compile prompt,
> Compile command: cat --<TAB>
>
> M-x shell,
> $ cat --<TAB>
>
> etc. etc.
> should all use bash-completion !
>
> If the user has it turned on in his shell, emacs should recognize it.
> https://www.google.com/search?q=3Dbash-completion+emacs

Note that `shell' already supports pcomplete, which extends to
`compile' (and `shell-command', etc.) AFAICT.  Try typing:

    M-x compile RET make SPC TAB

and enjoy...

I'm also not exactly sure how integrating bash completion with Emacs
would work.  Bash completion consists of a number of highly
bash-specific scripts.  It would take significant effort to write an
Emacs parser for them.

It seems like a better idea for people to spend time on making pcomplete
extensions for more commands.  But that would be outside the scope of
this feature request, I think.

I'm therefore closing this bug report.

Information forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:

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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
To: bug-gnu-emacs <bug-gnu-emacs@HIDDEN>
Subject: compile, shell etc. should use bash-completion !
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M-x compile prompt,
Compile command: cat --<TAB>

M-x shell,
$ cat --<TAB>

etc. etc.
should all use bash-completion !

If the user has it turned on in his shell, emacs should recognize it.
https://www.google.com/search?q=bash-completion+emacs

Acknowledgement sent to 積丹尼 Dan Jacobson <jidanni@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.

Report forwarded to bug-gnu-emacs@HIDDEN:
bug#26661; Package emacs. Full text available.

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