Re: Make all tree-sitter modes optional

[Eli Zaretskii <eliz@gnu.org>]

> Date: Tue, 17 Jan 2023 17:22:05 +0200
> Cc: casouri@gmail.com, monnier@iro.umontreal.ca, larsi@gnus.org,
>  theo@thornhill.no, jostein@secure.kjonigsen.net, emacs-devel@gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> > I'm frankly surprised that this is not what you do in your testing.  I
> > was quite sure that everyone who does any serious development or
> > maintenance work in Emacs does something like that.  How else is it
> > possible to, e.g., load some obscure package someone says is necessary
> > for reproducing a problem?
> > 
> > So in your case, when I'm done with testing whatever I need to test in
> > ruby-ts-mode, I ether shut down that session, or start another one in
> > parallel if I need to compare it with, say, ruby-mode.
> 
> That's untenable.
> 
> Running a benchmark is evaluating a form like
> 
>    (benchmark-run 1000 (progn (font-lock-mode -1) (font-lock-mode 1) 
> (font-lock-ensure)))
> 
> I can start a new session for an investigation, but I'm not going to 
> restart Emacs every time I evaluate a form.

Why not?  It's easy and quick and solves all the problems you
mentioned (and then some).  Like I said: I'm using this myself all the
time.

> Doing the benchmarks in a different order (e.g. go through the files 
> with one mode and then restart and go with another) is also only an 
> option if I were to note the numbers on e.g. a piece of paper. I rarely 
> do that; that would also slow me down compared to the current practice.

No need for paper: just M-w the data and yank into your production
session (which stays up and running all the time).  Again, I'm doing
this all the time in my work on Emacs.

> And also speaking of using 'emacs -Q', that's well-suited to testing 
> some classes of bugs, and not so much for others.

You can start from "emacs -Q" and load whatever is needed.  You can
make an ad-hoc init file that loads everything you need automatically,
to save manual typing.  I'm doing this all the time when the setup is
complicated.

> >>     (require 'ruby-ts-mode)
> >>     (add-to-list 'auto-mode-alist <...huge regexp from ruby-mode.el...>)
> >>
> >> ...and then update it over the years if new entries are added there over
> >> the years -- by the way, having a separate regexp in ruby-ts-mode.el is
> >> an unfortunate duplication.
> > 
> > If this is about the difference between the regexps, we can fix that,
> > I don't object to have both modes handle the same files.
> 
> A common constant would help, with that particular aspect.

Consider it done.