fix(treesitter): make highlighting work out of the box

Two independent bugs were preventing treesitter highlighting from
attaching to .lf buffers on a fresh install:

1. Parser fallback path was not on the runtime path.
   get_parser_install_dir() fell back to stdpath("data") .. "/parser"
   (~/.local/share/nvim/parser), but Neovim only auto-loads parsers
   from {rtp}/parser/*.so, and the user data dir itself is not in rtp —
   only its "site" subdir is. The file was written to disk but Neovim
   never saw it, so vim.treesitter.language.inspect("lf") kept failing.
   Fall back to stdpath("data") .. "/site/parser" instead, matching
   where other parsers (e.g. python, tmux) are installed. Also update
   uninstall() to clean up the legacy wrong location.

2. Several query patterns referenced node fields/tokens that don't
   exist in the grammar, which caused vim.treesitter.start() to throw
   and disabled all highlighting:
   - highlights.scm: "widthof" -> "widthof(" (token includes paren),
     imported_reactor class:/alias: -> reactor_class:/name:,
     key_value_pair key: -> name:
   - locals.scm: imported_reactor alias: -> name:
   - textobjects.scm: method body: -> code:, deadline handler: -> code:

Author: remifan

lua/lf/treesitter.lua

@@ -93,8 +93,9 @@ local function get_parser_install_dir()
     end
   end
 
-  -- Fall back to user data directory (always writable)
-  local data_parser = vim.fn.stdpath("data") .. "/parser"
+  -- Fall back to user data directory (always writable; must be under site/
+  -- so that it's picked up via runtimepath)
+  local data_parser = vim.fn.stdpath("data") .. "/site/parser"
   vim.fn.mkdir(data_parser, "p")
   return data_parser
 end
@@ -514,10 +515,11 @@ function M.uninstall()
     removed = true
   end
 
-  -- Also clean up any stale queries in site directory (legacy location)
-  local site_queries = vim.fn.stdpath("data") .. "/site/queries/lf"
-  if vim.fn.isdirectory(site_queries) == 1 then
-    vim.fn.delete(site_queries, "rf")
+  -- Also clean up a stale parser in the legacy location (stdpath("data")/parser
+  -- is not in runtimepath, so parsers installed there were never loaded).
+  local legacy_parser = vim.fn.stdpath("data") .. "/parser/" .. parser_lib_name()
+  if vim.fn.filereadable(legacy_parser) == 1 then
+    vim.fn.delete(legacy_parser)
     removed = true
   end
 

tree-sitter-lf/queries/highlights.scm

@@ -50,7 +50,7 @@
 "after" @keyword
 "deadline" @keyword
 "at" @keyword
-"widthof" @keyword.function
+"widthof(" @keyword.function
 "interleaved" @keyword
 "STP" @keyword
 "STAA" @keyword
@@ -147,9 +147,9 @@
 ; ============================================================================
 
 (imported_reactor
-  class: (identifier) @type)
+  reactor_class: (identifier) @type)
 (imported_reactor
-  alias: (identifier) @type)
+  name: (identifier) @type)
 
 ; ============================================================================
 ; Attributes
@@ -165,9 +165,9 @@
 ; ============================================================================
 
 (key_value_pair
-  key: (kebab) @property)
+  name: (kebab) @property)
 (key_value_pair
-  key: (string) @property)
+  name: (string) @property)
 
 ; ============================================================================
 ; Time units

tree-sitter-lf/queries/locals.scm

@@ -113,7 +113,7 @@
 
 ; Import alias
 (imported_reactor
-  alias: (identifier) @local.definition.type)
+  name: (identifier) @local.definition.type)
 
 ; ============================================================================
 ; References - References to defined variables

tree-sitter-lf/queries/textobjects.scm

@@ -18,11 +18,11 @@
 
 ; Method as function
 (method
-  body: (code_block) @function.inner) @function.outer
+  code: (code_block) @function.inner) @function.outer
 
 ; Deadline handler
 (deadline
-  handler: (code_block) @function.inner) @function.outer
+  code: (code_block) @function.inner) @function.outer
 
 ; Watchdog handler
 (watchdog