From: Jakub Jirutka <jakub@jirutka.cz>
Date: Thu, 23 May 2024 20:07:15 +0200
Subject: Fallback to classic syntax highlighting if tree-sitter parser
  is not available

See https://gitlab.alpinelinux.org/alpine/aports/-/issues/16132,
https://github.com/neovim/neovim/pull/26824

--- a/runtime/ftplugin/help.lua
+++ b/runtime/ftplugin/help.lua
@@ -1,5 +1,8 @@
 -- use treesitter over syntax (for highlighted code blocks)
-vim.treesitter.start()
+local ok, _ = pcall(vim.treesitter.start)
+if not ok then
+  print('Note: tree-sitter-vimdoc package is not installed, some features will not work')
+end
 
 -- add custom highlights for list in `:h highlight-groups`
 local bufname = vim.fs.normalize(vim.api.nvim_buf_get_name(0))
--- a/runtime/ftplugin/lua.lua
+++ b/runtime/ftplugin/lua.lua
@@ -1,2 +1,5 @@
 -- use treesitter over syntax
-vim.treesitter.start()
+local ok, _ = pcall(vim.treesitter.start)
+if not ok then
+  print('Note: tree-sitter-lua package is not installed, some features will not work')
+end
--- a/runtime/ftplugin/query.lua
+++ b/runtime/ftplugin/query.lua
@@ -9,7 +9,10 @@
 -- Do not set vim.b.did_ftplugin = 1 to allow loading of ftplugin/lisp.vim
 
 -- use treesitter over syntax
-vim.treesitter.start()
+local ok, _ = pcall(vim.treesitter.start)
+if not ok then
+  print('Note: tree-sitter-query package is not installed, some features will not work')
+end
 
 -- set omnifunc
 vim.bo.omnifunc = 'v:lua.vim.treesitter.query.omnifunc'