[PATCH] .dir-locals.el: Automatically set the GEISER-GUILE-LOAD-PATH variable.

[Maxim Cournoyer]

* .dir-locals.el: Set the GUIX-DIRECTORY and GEISER-GUILE-LOAD-PATH Emacs
variables based on the location of the .dir-locals file.
---
 .dir-locals.el | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/.dir-locals.el b/.dir-locals.el
index 19f15b3e1a..df5267ab8b 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -8,7 +8,31 @@
      ;; For use with 'bug-reference-prog-mode'.
      (bug-reference-url-format . "http://bugs.gnu.org/%s";)
      (bug-reference-bug-regexp
-      . "<https?://\\(debbugs\\|bugs\\)\\.gnu\\.org/\\([0-9]+\\)>")))
+      . "<https?://\\(debbugs\\|bugs\\)\\.gnu\\.org/\\([0-9]+\\)>")
+
+     ;; Emacs-Guix
+     (eval . (setq guix-directory
+                   (locate-dominating-file default-directory 
".dir-locals.el")))
+
+     ;; Geiser
+     ;; This allows automatically setting the `geiser-guile-load-path'
+     ;; variable when using various Guix checkouts (e.g., via git worktrees).
+     ;; The checkout root directory name should be prefixed by "guix" for it
+     ;; to work correctly.
+     (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* (if (string-suffix-p "/" root-dir)
+                                   (substring root-dir 0 -1)
+                                 root-dir))
+                    (clean-geiser-guile-load-path
+                     (seq-remove (lambda (x)
+                                   (string-match "/guix" x))
+                                 geiser-guile-load-path)))
+               (setq geiser-guile-load-path
+                     (cons root-dir* clean-geiser-guile-load-path))))))
+
  (c-mode          . ((c-file-style . "gnu")))
  (scheme-mode
   .
-- 
2.28.0