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bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and comp
From: |
Phillip Lord |
Subject: |
bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs' |
Date: |
Thu, 07 Apr 2016 22:42:40 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Paul Eggert <eggert@cs.ucla.edu> writes:
> On 04/07/2016 09:07 AM, Phillip Lord wrote:
>> Well, I need to scope this. If the issue is tcsh and bash, then I will
>> look at both. I cannot, of course, look at any arbitrary program which
>> might be affected.
>
> I think we'd be OK if we work with the "common" shells. But that would include
> zsh, whose current FAQ says the following:
>
> Probably the most reliable way of dealing with this is to look for
> the environment variable `$EMACS', which is set to `t' in
> Emacs' shell mode. Putting
>
> [[ $EMACS = t ]] && unsetopt zle
>
> in your .zshrc should be sufficient.
>
> So here it's not merely a matter of fixing zsh, it's also fixing all the
> users' .zshrc files that are following this (obsolescent) advice.
>
> So far we've looked at three shells (bash, tcsh, zsh), and found compatibility
> issues with all three. This is not a good sign.
Incidentally, I have looked again at #20484. What ever it is that is
supporting the directory tracking, it is not the EMACS=t behaviour of
bash, since in ansi-term we have:
(format "EMACS=%s (term:%s)" emacs-version term-protocol-version)
This usage will happily not break cask, since it was never supported in
the first place.
On the other hand, directory tracking works just fine in M-x shell in
both Emacs-25.0.91, and Emacs-25 head. So, the EMACS=t setting is not
an issue there either. And, dir tracking is not an issue at all for M-x
compile.
This suggests a simple fix: restore beaab89, except for the bit dealing
with ansi-term, which remains for the sake of future compatability. Both
bug reports are fixed. Anyone launching cask (or the make files Eli
Barzilay talked about in #20202) inside ansi-term may still have
problems.
ansi-term is already exceptional, note, because it does not obey the
"don't fiddle with EMACS if EMACS is already set" semantics.
Phil
- bug#20484: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Paul Eggert, 2016/04/07
- bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/07
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Paul Eggert, 2016/04/07
- bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Glenn Morris, 2016/04/07
- bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/07
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Paul Eggert, 2016/04/07
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs',
Phillip Lord <=
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Eli Zaretskii, 2016/04/08
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Stefan Monnier, 2016/04/08
- bug#20202: bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/08
- bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/07
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Stefan Monnier, 2016/04/07
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Eli Zaretskii, 2016/04/08
- bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/08
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Paul Eggert, 2016/04/08
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Phillip Lord, 2016/04/08
- bug#20484: bug#20202: Considered Harmful 73d213: 'Comint, term, and compile new set Emacs', Eli Zaretskii, 2016/04/08