On 2023-02-11 11:29, Christopher Baines wrote:

> guix-commits@gnu.org writes:
>
>> This is an automated email from the git hooks/post-receive script.
>>
>> abcdw pushed a commit to branch master
>> in repository guix.
>>
>> The following commit(s) were added to refs/heads/master by this push:
>>      new c77a3d4554 gnu: emacs: Add TREE_SITTER_GRAMMAR_PATH support.
>> c77a3d4554 is described below
>>
>> commit c77a3d4554175ee5320ccc713aa21b1ba3e6b8a3
>> Author: Andrew Tropin <andrew@trop.in>
>> AuthorDate: Fri Feb 10 12:32:12 2023 +0400
>>
>>     gnu: emacs: Add TREE_SITTER_GRAMMAR_PATH support.
>>     
>>     gnu/packages/emacs.scm (emacs)[native-search-paths]: Add a search-path for
>>     tree-sitter grammars.
>>     gnu/packages/aux-files/emacs/guix-emacs.el: Add directories from
>>     TREE_SITTER_GRAMMAR_PATH to treesit-extra-load-path.
>> ---
>>  gnu/packages/aux-files/emacs/guix-emacs.el |  7 +++++++
>>  gnu/packages/emacs.scm                     | 10 +++++++++-
>>  2 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/gnu/packages/aux-files/emacs/guix-emacs.el b/gnu/packages/aux-files/emacs/guix-emacs.el
>> index 56dbcb8d67..708093267d 100644
>> --- a/gnu/packages/aux-files/emacs/guix-emacs.el
>> +++ b/gnu/packages/aux-files/emacs/guix-emacs.el
>> @@ -76,6 +76,13 @@ The files in the list do not have extensions (.el, .elc)."
>>                     (when (file-directory-p pkg-dir)
>>                       (package-load-descriptor pkg-dir)))))))))))
>>  
>> +;; If emacs built with tree-sitter, read the value of the environment variable
>> +;; to make tree-sitter grammars available in emacs out-of-the-box.
>> +(with-eval-after-load 'treesit
>> +  (when-let ((grammar-path (getenv "TREE_SITTER_GRAMMAR_PATH")))
>> +    (mapcar (lambda (x) (add-to-list 'treesit-extra-load-path x))
>> +            (split-string grammar-path ":"))))
>> +
>>  (provide 'guix-emacs)
>>  
>>  ;;; guix-emacs.el ends here
>> diff --git a/gnu/packages/emacs.scm b/gnu/packages/emacs.scm
>> index 4ce41deb88..b6a66bafac 100644
>> --- a/gnu/packages/emacs.scm
>> +++ b/gnu/packages/emacs.scm
>> @@ -367,7 +367,15 @@
>>              (files '("lib/emacs/native-site-lisp")))
>>             (search-path-specification
>>              (variable "INFOPATH")
>> -            (files '("share/info")))))
>> +            (files '("share/info")))
>> +           ;; tree-sitter support is not yet available in emacs 28, but this
>> +           ;; search path won't harm and also will be beneficial for
>> +           ;; emacs-next and other emacs-* packages, which have tree-sitter
>> +           ;; support enabled.  Please, remove this comment, when emacs
>> +           ;; package is updated to 29.
>> +           (search-path-specification
>> +            (variable "TREE_SITTER_GRAMMAR_PATH")
>> +            (files '("lib/tree-sitter")))))
>>  
>>      (home-page "https://www.gnu.org/software/emacs/")
>>      (synopsis "The extensible, customizable, self-documenting text editor")
>
> The change to guix-emacs.el is pretty impactful here since that affects
> all the emacs packages including emacs-minimal I think.
>
> If I've understood your comment correctly, that does seem pretty
> wasteful since those rebuilds because of the changed emacs-minimal won't
> have any affect since it's version 28 and not 29, right? I think
> applying this change to just emacs-next would have been possible.

It could be applied to emacs-next only and we could move it to emacs
later when it updated to 29, but I checked guix refresh --list-dependent
emacs and it shown less than 100 packages so I decided to apply it
straight to emacs, but I forgot that emacs-minimal is inherited from
emacs and I guess you are right and it will affect all the emacs
packages.  Anything we would like to do about it right now?

-- 
Best regards,
Andrew Tropin