GNU bug report logs - #63648
29.0.90; project.el: with switch-use-entire-map, switch-project errors on non-project commands

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From: Dmitry Gutov <dmitry <at> gutov.dev>
To: Juri Linkov <juri <at> linkov.net>
Cc: Spencer Baugh <sbaugh <at> janestreet.com>, 63648 <at> debbugs.gnu.org, sbaugh <at> catern.com
Subject: bug#63648: 29.0.90; project.el: with switch-use-entire-map, switch-project errors on non-project commands
Date: Mon, 23 Oct 2023 20:24:08 +0300

[Message part 1 (text/plain, inline)]

On 23/10/2023 09:58, Juri Linkov wrote:
>>> Wow, it works nicely for 'C-x p p C-x d'.
>>> But strange it fails for 'C-x p p C-x v d'
>>> with the same error:
>>>     (wrong-type-argument commandp 1)
>>
>> That's because (lookup-key ... "vd") also returns 1.
>>
>> I haven't been able to find a solution that works like we would expect. The
>> most trivial would be to loop cutting off invalid prefixes, but then we end
>> up with 'd', not 'v'. That's probably not what you want.
>>
>> Ideally, 'read-key-sequence' would stop at the user pressing 'v' and return
>> "^Xv", then the rest would work out okay. But I haven't managed to have it
>> do that, even when using overriding-terminal-local-map and temporarily
>> altering the global map. My experimental patch is below, you can try
>> tweaking it.
> 
> Now can't type 'C-x p p C-x v d' completely because
> 'C-x p p C-x v' opens vc-dir after typing 'v'.

Huh. That actually works for me now, after I ran 'make' and restarted.

But I thought you wanted this? 'C-x v d' ends with vc-dir, so if 'C-x p 
p C-x v' opens vc-dir, then isn't this what you expected?

Anyway, the resulting UI is fairly counter-intuitive.

>> And overall I'm not sure it's a constructive approach because you might
>> have been going for 'C-x v d' (where the 'v' translation is correct), but
>> you might have been going for 'C-x v D' or 'C-x v v' instead, very
>> different commands. It might be better to report unknown key sequence and
>> let the user make an explicit choice, like it works now. Depends on whether
>> you notice the key sequence echoing while doing that input.
> 
> Maybe adding a new option 'project-switch-use-global-map' would help?

Try the attached, it's another iteration on the latest patch 
(prefix-command-echo-keystrokes-functions doesn't seem to work reliably 
in this context). Try it together with

  (setq project-switch-commands 'project-any-command)

Also see the "Variation" in the comment (it allows for short bindings).

[project-other-command-v3.diff (text/x-patch, attachment)]

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