Re: branch master updated: gnu: emacs: Add TREE_SITTER_GRAMMAR_PATH support.

[Andrew Tropin <andrew@trop.in>]

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On 2023-02-11 16:35, Andrew Tropin wrote:

> 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?

Let's keep it as it is and I'll store it in mind for the next time.

There is an idea to update guix refresh --list-dependent to handle the
case with inherited packages as well.  WDYT?

-- 
Best regards,
Andrew Tropin

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