chore: expose start and stop highlighter

Decompose highlighter module in small functions to allow exporting a
start and stop functions without the syntax change.
Also fix linter issues in configs.lua

lua/nvim-treesitter/configs.lua

@@ -71,8 +71,8 @@ end
 -- @param bufnr buffer number, defaults to current buffer
 -- @param lang language, defaults to current language
 local function enable_module(mod, bufnr, lang)
-  local bufnr = bufnr or api.nvim_get_current_buf()
-  local lang = lang or parsers.get_buf_lang(bufnr)
+  bufnr = bufnr or api.nvim_get_current_buf()
+  lang = lang or parsers.get_buf_lang(bufnr)
   M.attach_module(mod, bufnr, lang)
 end
 
@@ -112,7 +112,7 @@ end
 -- @param mod path to module
 -- @param bufnr buffer number, defaults to current buffer
 local function disable_module(mod, bufnr)
-  local bufnr = bufnr or api.nvim_get_current_buf()
+  bufnr = bufnr or api.nvim_get_current_buf()
   M.detach_module(mod, bufnr)
 end
 
@@ -152,8 +152,8 @@ end
 -- @param bufnr buffer number, defaults to current buffer
 -- @param lang language, defaults to current language
 local function toggle_module(mod, bufnr, lang)
-  local bufnr = bufnr or api.nvim_get_current_buf()
-  local lang = lang or parsers.get_buf_lang(bufnr)
+  bufnr = bufnr or api.nvim_get_current_buf()
+  lang = lang or parsers.get_buf_lang(bufnr)
 
   if attached_buffers_by_module.has(mod, bufnr) then
     disable_module(mod, bufnr)
@@ -182,7 +182,7 @@ end
 -- @param root root configuration table to start at
 -- @param path prefix path
 local function recurse_modules(accumulator, root, path)
-  local root = root or config.modules
+  root = root or config.modules
 
   for name, module in pairs(root) do
     local new_path = path and (path .. "." .. name) or name
@@ -449,8 +449,8 @@ end
 -- @param bufnr the bufnr
 -- @param lang the language of the buffer
 function M.attach_module(mod_name, bufnr, lang)
-  local bufnr = bufnr or api.nvim_get_current_buf()
-  local lang = lang or parsers.get_buf_lang(bufnr)
+  bufnr = bufnr or api.nvim_get_current_buf()
+  lang = lang or parsers.get_buf_lang(bufnr)
   local resolved_mod = resolve_module(mod_name)
 
   if resolved_mod and not attached_buffers_by_module.has(mod_name, bufnr) and M.is_enabled(mod_name, lang, bufnr) then
@@ -464,7 +464,7 @@ end
 -- @param bufnr the bufnr
 function M.detach_module(mod_name, bufnr)
   local resolved_mod = resolve_module(mod_name)
-  local bufnr = bufnr or api.nvim_get_current_buf()
+  bufnr = bufnr or api.nvim_get_current_buf()
 
   if resolved_mod and attached_buffers_by_module.has(mod_name, bufnr) then
     attached_buffers_by_module.remove(mod_name, bufnr)

lua/nvim-treesitter/highlight.lua

@@ -103,30 +103,48 @@ hlmap["type.builtin"] = "TSTypeBuiltin"
 hlmap["variable"] = "TSVariable"
 hlmap["variable.builtin"] = "TSVariableBuiltin"
 
-function M.attach(bufnr, lang)
+local function should_enable_vim_regex(config, lang)
+  local additional_hl = config.additional_vim_regex_highlighting
+  local is_table = type(additional_hl) == "table"
+
+  return additional_hl and (not is_table or vim.tbl_contains(additional_hl, lang))
+end
+
+local function enable_syntax(bufnr)
+  api.nvim_buf_set_option(bufnr, "syntax", "ON")
+end
+
+function M.get_config()
+  return configs.get_module "highlight"
+end
+
+function M.stop(bufnr)
+  if ts.highlighter.active[bufnr] then
+    ts.highlighter.active[bufnr]:destroy()
+  end
+end
+
+function M.start(bufnr, lang)
   local parser = parsers.get_parser(bufnr, lang)
-  local config = configs.get_module "highlight"
+  local config = M.get_config()
 
   for k, v in pairs(config.custom_captures) do
     hlmap[k] = v
   end
 
   ts.highlighter.new(parser, {})
+end
 
-  local is_table = type(config.additional_vim_regex_highlighting) == "table"
-  if
-    config.additional_vim_regex_highlighting
-    and (not is_table or vim.tbl_contains(config.additional_vim_regex_highlighting, lang))
-  then
-    api.nvim_buf_set_option(bufnr, "syntax", "ON")
+function M.attach(bufnr, lang)
+  M.start(bufnr, lang)
+  if should_enable_vim_regex(M.get_config(), lang) then
+    enable_syntax(bufnr)
   end
 end
 
 function M.detach(bufnr)
-  if ts.highlighter.active[bufnr] then
-    ts.highlighter.active[bufnr]:destroy()
-  end
-  api.nvim_buf_set_option(bufnr, "syntax", "ON")
+  M.stop(bufnr)
+  enable_syntax(bufnr)
 end
 
 return M