bug#64442: 29.0.92; treesit-beginning-of-defun fails in DEFUN functions in C

[Eli Zaretskii <eliz@gnu.org>]

> Cc: 64442@debbugs.gnu.org
> Date: Sun, 30 Jul 2023 10:10:35 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> 
> > From: Yuan Fu <casouri@gmail.com>
> > Date: Tue, 11 Jul 2023 19:10:01 -0700
> > Cc: 64442@debbugs.gnu.org
> > 
> > 
> > 
> > > On Jul 6, 2023, at 11:40 PM, Eli Zaretskii <eliz@gnu.org> wrote:
> > > 
> > >> From: Yuan Fu <casouri@gmail.com>
> > >> Date: Thu, 6 Jul 2023 23:15:00 -0700
> > >> Cc: 64442@debbugs.gnu.org
> > >> 
> > >>> On Jul 4, 2023, at 4:39 AM, Eli Zaretskii <eliz@gnu.org> wrote:
> > >>> 
> > >>> Why cannot we look for a top-level expression_statement node which is
> > >>> a call_expression whose function identifier is "DEFUN" and whose
> > >>> position is between the place where C-M-a was invoked and the place
> > >>> where it does find a defun?
> > >> 
> > >> It’s gonna be ugly, but I can take a jab at it this weekend. I’m thinking of a wrapper function that tries to detect DEFUN before falling back to the ordinary tree-sitter defun movement function.
> > > 
> > > Thanks.  let's see how ugly it is before deciding whether it's worth it.
> > > 
> > >>> DEFUN's cannot be nested, so we don't need to consider that.
> > >> 
> > >> Yeah, in general C sources don’t have nested defuns, only C++ ones do.
> > > 
> > > No, I meant the use of DEFUN macros in Emacs cannot be nested.
> > 
> > Just an update. I didn’t forget about this, but it’s more harder than I thought and I’m still working on it :-(
> 
> Any progress with this?  It would be good to have a solution in Emacs
> 29.2, if possible.

Ping!