Auto install and auto start treesitter

nvim/dot-config/nvim/lua/autocmds.lua

@@ -33,14 +33,22 @@ vim.api.nvim_create_autocmd({ "InsertEnter", "WinLeave" }, {
 	pattern = "*",
 })
 
+-- Auto install treesitter parser and start them
 vim.api.nvim_create_autocmd("FileType", {
-	pattern = require("tools.highlight"),
-	callback = function()
-		-- syntax highlighting, provided by Neovim
-		vim.treesitter.start()
-		-- folds, provided by Neovim
-		vim.wo.foldexpr = "v:lua.vim.treesitter.foldexpr()"
-		-- indentation, provided by nvim-treesitter
-		vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
+	desc = "Enable Treesitter",
+	group = vim.api.nvim_create_augroup("enable_treesitter", {}),
+	callback = function(event)
+		local has_treesitter, treesitter = pcall(require, "nvim-treesitter")
+		if has_treesitter then
+			local language = vim.treesitter.language.get_lang(event.match)
+			treesitter.install(language):await(function(a)
+				if pcall(vim.treesitter.start) then
+					-- Use Treesitter indentation and folds.
+					vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
+					vim.wo.foldmethod = "expr"
+					vim.wo.foldexpr = "v:lua.vim.treesitter.foldexpr()"
+				end
+			end)
+		end
 	end,
 })

nvim/dot-config/nvim/lua/options.lua

@@ -61,3 +61,6 @@ vim.o.scrolloff = 10
 -- Highlight tabs and trailing whitespace
 vim.o.listchars = "trail:~,tab:¦⁃,nbsp:␣"
 vim.o.list = true
+
+-- Fold settings
+vim.o.foldlevelstart = 99

nvim/dot-config/nvim/lua/plugins/treesitter.lua

@@ -11,12 +11,8 @@ return {
 		branch = "main",
 		build = ":TSUpdate",
 		opts = {
-			-- Add languages to be installed here that you want installed for treesitter
 			ensure_installed = require("tools.highlight"),
 
-			-- Autoinstall languages that are not installed. Defaults to false (but you can change for yourself!)
-			auto_install = true,
-
 			highlight = { enable = true },
 			indent = { enable = true },
 			incremental_selection = {