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Re: emacs-tree-sitter and Emacs

From: Stefan Monnier
Subject: Re: emacs-tree-sitter and Emacs
Date: Mon, 30 Mar 2020 10:11:36 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

> First off, in the issue tracker we have a ticket open for making this
> project available on GNU ELPA, Ubolonton seems willing to make that
> a reality

That would be neat.

> but this package has some special requirements that would make
> impossible to submit it to GNU ELPA or MELPA, for instance, we need to
> ship with grammars for some languages that require compiling and AFAIK
> there is no way to build external dependencies in *ELPA.[1]

Indeed, the GNU ELPA infrastructure is too weak to support such a thing
right now, but that's a problem we need to fix anyway, so it just means
we should work on it.

> Finally, I'm planning to tackle indentation for my next pull request.
> It come as a surprise that Emacs has no "central" indentation engine
> but that instead each major mode ships with its own indentation
> engine.

It's not so surprising if you think about it: indentation requires
parsing, so "a central indentation engine" requires something like
tree-sitter ;-)

SMIE is the closest there is so far (contrary to tree-sitter it uses
a very simple parsing strategy, which is just barely sufficient for
"typical" indentation cases).

CC-mode has another engine, which is used for several languages.

And finally, there's `wisi` on GNU ELPA, it aims to be very generic and
pretty flexible, but AFAIK it's only used by `ada-mode` so far.


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