Yuan Fu <casouri@gmail.com> writes:

> Hi all,

Hi,

> Since Emacs 29 is now released, I’d like to propose adding expreg to
> ELPA. Expreg can be considered a lite version of expand-region. The
> notable difference is its use of tree-sitter for language-specific
> expansions. I also took the liberty to do things differently than
> expand-region, eg, expreg uses a smaller number of expanders [1]; it
> is easier to debug when the expansion isn’t what you expected; and it
> only provides two functions for expansion and contraction, and one
> variable for adding/removing expanders—no transient maps and other
> “smart” features, nor different variables to set for each major mode.
>
> The obvious downsides is that, of course, it’s pretty useless on
> anything other than lisp if you don’t have tree-sitter grammars and
> major mode installed. You can use it in a non-tree-sitter major mode,
> as long the tree-sitter grammar exists. You only need to create a
> parser and expreg will automatically use the parser [2].
>
> I’ve been using it for months and ironed out all sorts of edge-cases, and can recommend it for daily usage.

this looks nice!  I have a few comments that might be interesting: