Make tree-sitter-explorer support selecting local parser

Now treesit-explore-mode will prompt the user to select a parser
to explore, rather than a language.  It'll also include the
local parsers at point for selection.

* lisp/treesit.el (treesit--explorer-language): Change to
treesit--explorer-parser.
(treesit--explorer--nodes-to-highlight):
(treesit--explorer-refresh): Change to use parser.
(treesit--explorer-generate-parser-alist): New function.
(treesit-explorer-switch-parser): New command.
(treesit-explore-mode): Use switch-parser to setup.
* doc/lispref/parsing.texi (Language Grammar): Mention
treesit-explorer-switch-parser.

1 files changed, 3 insertions, 0 deletions

diff --git a/doc/lispref/parsing.texi b/doc/lispref/parsing.texi
index 5ef29f558ef..7fbb8e61ce1 100644
--- a/doc/lispref/parsing.texi
+++ b/doc/lispref/parsing.texi
@@ -240,12 +240,15 @@ which displays the syntax tree of the source in the current buffer in
 real time.  Emacs also comes with an ``inspect mode'', which displays
 information of the nodes at point in the mode-line.
 
+@findex treesit-explorer-switch-parser
 @deffn Command treesit-explore
 This command pops up a window displaying the syntax tree of the source in
 the current buffer.  Selecting text in the source buffer highlights
 the corresponding nodes in the syntax tree display.  Clicking
 on nodes in the syntax tree highlights the corresponding text in the
 source buffer.
+
+To switch to another parser, use @code{treesit-explorer-switch-parser}.
 @end deffn
 
 @deffn Command treesit-inspect-mode