GNU bug report logs - #74334
29.4; Eglot ignores locally set configuration

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: João Távora <joaotavora <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#74334: closed (29.4; Eglot ignores locally set configuration)
Date: Wed, 13 Nov 2024 10:12:03 +0000

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Your message dated Wed, 13 Nov 2024 10:10:02 +0000
with message-id <CALDnm51uGqEpB2uRtgTDJ+C-t3ULBm4mmG3y0aLyKURpvy=pdw <at> mail.gmail.com>
and subject line Re: 29.4; Eglot ignores locally set configuration
has caused the debbugs.gnu.org bug report #74334,
regarding 29.4; Eglot ignores locally set configuration
to be marked as done.

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From: Acid Bong <acidbong <at> tilde.club>
To: bug-gnu-emacs <at> gnu.org
Cc: joaotavora <at> gmail.com
Subject: 29.4; Eglot ignores locally set configuration
Date: Tue, 12 Nov 2024 22:49:18 +0200

Can be observed on both builtin (1.12.29) and the newest Eglot (1.17). I'm starting Eglot manually, i have no hooks for Rust.

My repo structure:
/
...
|_pkgs/rsblocks/
  |_.dir-locals.el
  |_Cargo.toml
  ...

Since my Rust project isn't in the root of the repo, I need to specify its location for rust-analyzer. Using .dir-locals.el with this content:
```lisp
((nil
  . ((eglot-workspace-configuration
      . (:rust-analyzer (:linkedProjects ["pkgs/rsblocks/Cargo.toml"]))))))
;; thank god it supports relative paths
```
does nothing: I see the variable value is set properly with `C-h v`, but Eglot doesn't seem to recognize it (`eglot-show-workspace-configuration` shows "null").

However, only when I set it globally, Eglot can apply the config to the language server.

Expected behaviour: like described in the manual, Eglot should recognize local values. 

Possibly related report: https://github.com/joaotavora/eglot/issues/355 (unresolved)

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From: João Távora <joaotavora <at> gmail.com>
To: Acid Bong <acidbong <at> tilde.club>
Cc: 74334 <at> debbugs.gnu.org, 74334-done <at> debbugs.gnu.org
Subject: Re: 29.4; Eglot ignores locally set configuration
Date: Wed, 13 Nov 2024 10:10:02 +0000

On Wed, Nov 13, 2024 at 9:45 AM Acid Bong <acidbong <at> tilde.club> wrote:

> Woah, it actually works. Kinda weird that it requires .dir-locals.el to be in the
> Git root, not in the Cargo root.

It's weird, but only because having this particular project very deep inside
the only dir that Emacs knows how to automatically recognize as a
project is weird.  Look into teaching project.el about "Cargo.toml" files,
it shouldn't be very hard.

You may or may not need "nested" projects, that's an orthogonal
issue.  If you're sure you do need nested or complicated project
setups,  look at [1])

João

[1]: https://github.com/joaotavora/eglot/discussions/1337#discussioncomment-8853117

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