init

homes/modules/programs/neovim/lua/plugins/treesitter.lua

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+-- to help me write this after nvim-treesitter updated, i used:
+-- https://github.com/BirdeeHub/nixCats-nvim/blob/3c9bc4d7123e1b48d92f25ba505b889af541e897/templates/example/lua/myLuaConf/plugins/treesitter.lua
+
+return {
+  {
+    "nvim-treesitter",
+    lazy = false,
+    after = function (plugin)
+      --@param buf integer
+      --@param language string
+      local function treesitter_try_attach(buf, language)
+	--check if parser exists and load it
+	if not vim.treesitter.language.add(language) then
+	  return
+	end
+
+	-- enables syntax highlight and other treesitter features
+	vim.treesitter.start(buf, language)
+
+	-- enables treesitter based folds
+	vim.wo.foldexpr = "v:lua.vim.treesitter.foldexpr()"
+
+	-- enables treesiter based indentation
+	vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
+      end
+
+      local available_parsers = require("nvim-treesitter").get_available()
+      vim.api.nvim_create_autocmd("FileType", {
+        callback = function(args)
+	  local buf, filetype = args.buf, args.match
+	  local language = vim.treesitter.language.get_lang(filetype)
+	  if not language then
+	    return
+	  end
+
+	  local installed_parsers = require("nvim-treesitter").get_installed("parsers")
+
+	  if vim.tbl_contains(installed_parsers, language) then
+	    -- enable the parser if it is installed
+	    treesitter_try_attach(buf, language)
+	  elseif vim.tbl_contains(available_parsers, language) then
+	    -- if a parser is available in `nvim-treesitter` enable it after ensuring it is installed
+	    require("nvim-treesitter").install(language):await(function()
+	      treesitter_try_attach(buf, language)
+	    end)
+	  else
+	    -- try to enable treesitter features in case the parser exists but is not available from `nvim-treesitter`
+	    treesitter_try_attach(buf, language)
+	  end
+	end,
+      })
+    end,
+  },
+  {
+    "nvim-treesitter-textobjects",
+    lazy = false,
+    before = function(plugin)
+      vim.g.no_plugin_maps = true
+    end,
+    after = function(plugin)
+      require("nvim-treesitter-textobjects").setup {
+        select = {
+	  lookahead = true,
+	  selection_modes = {
+	    ['@parameter.outer'] = 'v', -- charwise
+	    ['@function.outer'] = 'V', -- linewise
+	  },
+	  include_surrounding_whitespace = false,
+	},
+      }
+
+      -- keymaps
+      vim.keymap.set({ "x", "o" }, "am", function()
+        require "nvim-treesitter-textobjects.select".select_textobject("@function.outer", "textobjects")
+      end)
+      vim.keymap.set({ "x", "o" }, "im", function()
+        require "nvim-treesitter-textobjects.select".select_textobject("@function.inner", "textobjects")
+      end)
+      vim.keymap.set({ "x", "o" }, "ac", function()
+        require "nvim-treesitter-textobjects.select".select_textobject("@class.outer", "textobjects")
+      end)
+      vim.keymap.set({ "x", "o" }, "ic", function()
+        require "nvim-treesitter-textobjects.select".select_textobject("@class.inner", "textobjects")
+      end)
+      -- You can also use captures from other query groups like `locals.scm`
+      vim.keymap.set({ "x", "o" }, "as", function()
+        require "nvim-treesitter-textobjects.select".select_textobject("@local.scope", "locals")
+      end)
+
+      -- NOTE: for more textobjects options, see the following link.
+      -- This template is using the new `main` branch of the repo.
+      -- https://github.com/nvim-treesitter/nvim-treesitter-textobjects/tree/main
+    end,
+  },
+}