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bug#19080: 24.4; wish: enable show-paren-mode to highlight matching same
From: |
Eli Zaretskii |
Subject: |
bug#19080: 24.4; wish: enable show-paren-mode to highlight matching same-level keywords |
Date: |
Fri, 13 May 2022 08:52:50 +0300 |
> From: Yuan Fu <casouri@gmail.com>
> Date: Thu, 12 May 2022 15:52:14 -0700
> Cc: Lars Ingebrigtsen <larsi@gnus.org>,
> josh@berdine.net,
> 19080@debbugs.gnu.org
>
> > We could perhaps add a new feature, based on tree-sitter, to highlight
> > a block of code, where the block is defined by PL rules, not by
> > parens, braces, and similar simple syntactic elements.
> >
> > Yuan, WDYT? Can this be added to the tree-sitter branch perhaps?
>
> That sounds interesting, and it should be easy. But what do we want the API
> be? First of all, should we make a separate mode or extend show-paren-mode?
> Extending show-paren-mode entails doing some non-trivial refactoring to
> paren.el.
IMO, it should be a separate minor mode; show-paren-mode is not
necessarily about program blocks, since parentheses appear not only
(and mostly not) as block delimiters.
The API should be probably: given a buffer POSITION, return the 2
positions of the innermost enclosing block, or nil if POSITION is not
in any block. A possible extension could be to return a list of
position pairs that provide also the blocks enclosed inside the
POSITION's block.
> I think, that adding tree-sitter “backend” needs refactoring existing code
> non-trivially.
If show-paren-mode would want to use tree-sitter, it will need
refactoring, yes. Which other packages you envision could benefit
from using tree-sitter?