From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
To: Christopher Lemmer Webber <cwebber@dustycloud.org>
Cc: guix-devel@gnu.org
Subject: Re: [PATCH] Automatically set `geiser-guile-load-path' from .dir-locals
Date: Sun, 15 Nov 2020 23:18:14 -0500 [thread overview]
Message-ID: <87y2j2c4u1.fsf@gmail.com> (raw)
In-Reply-To: <87lff3iueo.fsf@dustycloud.org> (Christopher Lemmer Webber's message of "Sat, 14 Nov 2020 14:57:03 -0500")
Hello Christopher,
CC'ing Ludovic since they had that problem as well, so might be
interested in testing your solution.
Christopher Lemmer Webber <cwebber@dustycloud.org> writes:
[...]
> I figured out what was happening! The bug is *technically* in vc-mode.
> However, nontheless it manifested here...
>
> Here's what happened. vc-mode has some various hacks, as you can see
> above with "hack-local-variables-apply"... which traverses the dirlocals
> stuff. (Not sure what the purpose is, didn't look too long.)
>
> However for whatever reason, vc-mode also seems to be reusing buffers
> such as `*vc-diff*'... and somehow still is left in the directory
> context it *first* was used in.
>
> Thus if I C-x v = in a guix-oriented buffer first, and then switch to
> another completely different project and do the same, it's loading the
> dirlocals from Guix(...!!!!)
>
> This is clearly a bug in vc-mode, I'll try to report it as such.
Thank you for the investigation. I'd be really happy if you could
report the problem upstream (M-x report-emacs-bug) and link to it here!
Be sure to include a very detailed description of how to reproduce; I
for one still am unable to reproduce with the above instructions. I've
tried many ways, using a pure environment, not loading my Emacs init
file, etc. based on what Miguel had written in IRC at the time of the
initial report, but to no avail.
> In the meanwhile, I used this hacky "fix". Maybe worth applying for the
> moment... what do you think of it?
I'd like to have the upstream bug linked in that fix rather than the
Guix one; that way it'll be possible to track upstream resolution and
know when the workaround can be removed.
> #+BEGIN_SRC diff
> diff --git a/.dir-locals.el b/.dir-locals.el
> index 8e5d3902e3..2aa446a4f6 100644
> --- a/.dir-locals.el
> +++ b/.dir-locals.el
> @@ -17,17 +17,19 @@
> ;; Geiser
> ;; This allows automatically setting the `geiser-guile-load-path'
> ;; variable when using various Guix checkouts (e.g., via git worktrees).
> - (eval . (let* ((root-dir (expand-file-name
> - (locate-dominating-file
> - default-directory ".dir-locals.el")))
> - ;; Workaround for bug https://issues.guix.gnu.org/43818.
> - (root-dir* (directory-file-name root-dir)))
> - (unless (boundp 'geiser-guile-load-path)
> - (defvar geiser-guile-load-path '()))
> - (make-local-variable 'geiser-guile-load-path)
> - (require 'cl-lib)
> - (cl-pushnew root-dir* geiser-guile-load-path
> - :test #'string-equal)))))
> + (eval . (let ((root-dir-unexpanded (locate-dominating-file
> + default-directory ".dir-locals.el")))
> + (when root-dir-unexpanded
> + (let* ((root-dir (expand-file-name root-dir-unexpanded))
> + ;; Workaround for bug https://issues.guix.gnu.org/43818.
> + (root-dir* (directory-file-name root-dir)))
> +
> + (unless (boundp 'geiser-guile-load-path)
> + (defvar geiser-guile-load-path '()))
> + (make-local-variable 'geiser-guile-load-path)
> + (require 'cl-lib)
> + (cl-pushnew root-dir* geiser-guile-load-path
> + :test #'string-equal)))))))
>
> (c-mode . ((c-file-style . "gnu")))
> (scheme-mode
> #+END_SRC
>
> Btw, I'm not very familiar with dirlocals. I see that setq is used in
> the previous definition. Woudl setq-local be better... or does it do
> that by default?
Good observation. The `guix-directory' is set globally. It could be
neater if we made it also a buffer-local variable like the
`geiser-guile-load-path' below.
Thank you for having persevered in understanding the root cause of the
issue you had, and sharing the details here.
Maxim
next prev parent reply other threads:[~2020-11-16 4:18 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-25 18:08 [PATCH] Automatically set `geiser-guile-load-path' from .dir-locals Maxim Cournoyer
2020-10-25 18:13 ` Pierre Neidhardt
2020-10-25 18:42 ` [PATCH] .dir-locals.el: Automatically set the GEISER-GUILE-LOAD-PATH variable Maxim Cournoyer
2020-10-25 18:52 ` Pierre Neidhardt
2020-10-25 21:37 ` Maxim Cournoyer
2020-10-25 21:01 ` Miguel Ángel Arruga Vivas
2020-10-26 5:47 ` Maxim Cournoyer
2020-10-26 5:53 ` [PATCH v2] " Maxim Cournoyer
2020-10-26 7:56 ` Pierre Neidhardt
2020-10-26 11:38 ` Miguel Ángel Arruga Vivas
2020-10-27 16:53 ` Maxim Cournoyer
2020-10-27 18:58 ` Miguel Ángel Arruga Vivas
2020-10-27 17:44 ` [PATCH v3] " Maxim Cournoyer
2020-10-31 4:19 ` Maxim Cournoyer
2020-11-01 1:02 ` Miguel Ángel Arruga Vivas
2020-10-26 13:43 ` [PATCH] Automatically set `geiser-guile-load-path' from .dir-locals zimoun
2020-10-26 15:03 ` Pierre Neidhardt
2020-11-05 2:20 ` Christopher Lemmer Webber
2020-11-05 4:00 ` Christopher Lemmer Webber
2020-11-05 9:25 ` Miguel Ángel Arruga Vivas
2020-11-05 17:26 ` Christopher Lemmer Webber
2020-11-14 19:57 ` Christopher Lemmer Webber
2020-11-16 4:18 ` Maxim Cournoyer [this message]
2020-11-16 14:54 ` Miguel Ángel Arruga Vivas
2020-11-16 17:41 ` Christopher Lemmer Webber
2020-11-16 18:07 ` Christopher Lemmer Webber
2020-11-16 20:57 ` Miguel Ángel Arruga Vivas
2020-11-16 23:09 ` Christopher Lemmer Webber
2020-11-17 15:36 ` Maxim Cournoyer
2020-11-18 10:12 ` Miguel Ángel Arruga Vivas
2020-11-05 14:21 ` Maxim Cournoyer
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