Re: [Savannah-hackers-public] Delays in mail delivery by gnu.org mailing lists

[Eli Zaretskii]

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  From: Po Lu <luangruo@yahoo.com>
  To: Theodor Thornhill <theo@thornhill.no>
  Cc: Eli Zaretskii <eliz@gnu.org>,  Yuan Fu <casouri@gmail.com>,  acm@muc.de,
   emacs-devel@gnu.org,  jostein@kjonigsen.net
  Subject: Re: Call for volunteers: add tree-sitter support to major modes
  References: <83czb1jrm3.fsf@gnu.org> <878rlo7on0.fsf@thornhill.no>
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   <87bkqier8o.fsf@thornhill.no> <87ilkqixkh.fsf@yahoo.com>
   <87mta2hhwp.fsf@thornhill.no>
  Date: Tue, 11 Oct 2022 18:46:43 +0800
  In-Reply-To: <87mta2hhwp.fsf@thornhill.no> (Theodor Thornhill's message of
   "Tue, 11 Oct 2022 10:40:54 +0200")
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  Theodor Thornhill <theo@thornhill.no> writes:

  > Sure!
  >
  > (The following example is from the other tree-sitter implementation, but
  > it would be as simple, if not simpler in the new one)
  >
  > Consider this code:
  >
  > ```
  > (defun csharp-delete-method-at-point ()
  >   "Deletes the method at point."
  >   (interactive)
  >   (when-let ((method (tree-sitter-node-at-point 'method_declaration)))
  >     (delete-region (tsc-node-start-position method)
  >                    (tsc-node-end-position method))))
  > ```
  >
  > If point is _anywhere_ inside a method, this function will delete the
  > whole thing.  It knows the beginning and end, and doesn't have to do
  > anything else than returning the relevant points.  The same could be
  > done with i.e. string, where if:
  >
  > ```
  > "some string here where this | denotes where point is"
  > ```
  >
  > You could create paredit-like functionality to delete _until_ the last
  > quote, etc.  Compare them to Vims 'cip', 'dap' etc.  These are only
  > trivial examples, but you could also imagine creating refactoring
  > functions where you extract variables and insert them in the scope of
  > other functions and so forth.  The huge thing here is that you have the
  > _actual_ parse tree.  Indentation is also now simpler, more correct.
  > There are all sorts of things we could evolve from here.  Font-lock is
  > just because that is the clearest, easiest and fastest benefit.

  Thank you for the detailed explanation.