Refactor entire conf

.config/nvim/lua/halfdan/plugins/treesitter.lua

@@ -0,0 +1,84 @@
+local function register(ensure_installed)
+    for filetype, parser in pairs(ensure_installed) do
+        local filetypes = vim.treesitter.language.get_filetypes(parser)
+        if not vim.tbl_contains(filetypes, filetype) then
+            table.insert(filetypes, filetype)
+        end
+
+        -- register and start parsers for filetypes
+        vim.treesitter.language.register(parser, filetypes)
+    end
+end
+
+--- Install and start parsers for nvim-treesitter.
+local function install_and_start()
+    -- Auto-install and start treesitter parser for any buffer with a registered filetype
+    vim.api.nvim_create_autocmd({ "BufWinEnter" }, {
+        callback = function(event)
+            local bufnr = event.buf
+            local filetype = vim.api.nvim_get_option_value("filetype", { buf = bufnr })
+
+            -- Skip if no filetype
+            if filetype == "" then
+                return
+            end
+
+            -- Get parser name based on filetype
+            local parser_name = vim.treesitter.language.get_lang(filetype) -- WARNING: might return filetype (not helpful)
+            if not parser_name then
+                return
+            end
+
+            vim.notify(
+                vim.inspect("Successfully got parser " .. parser_name .. " for filetype " .. filetype),
+                vim.log.levels.DEBUG,
+                { title = "core/treesitter" }
+            )
+
+            -- Check if parser_name is available in parser configs
+            local parser_configs = require("nvim-treesitter.parsers")
+            local parser_can_be_used = parser_configs[parser_name]
+            if not parser_can_be_used then
+                return -- Parser not ailable, skip silently
+            end
+
+            local parser_installed = pcall(vim.treesitter.get_parser, bufnr, parser_name)
+
+            -- If not installed, install parser synchronously
+            if not parser_installed then
+                require("nvim-treesitter").install({ parser_name }):wait(30000) -- main branch syntax
+                vim.notify("Installed parser: " .. parser_name, vim.log.levels.INFO, { title = "core/treesitter" })
+            end
+
+            -- Check so tree-sitter can see the newly installed parser
+            parser_installed = pcall(vim.treesitter.get_parser, bufnr, parser_name)
+            if not parser_installed then
+                return
+            end
+
+            -- Start treesitter for this buffer
+            vim.treesitter.start(bufnr, parser_name)
+        end,
+    })
+end
+
+return {
+    -- Treesitter
+    {
+        'nvim-treesitter/nvim-treesitter',
+        lazy = false,
+        branch = 'main',
+        build = ':TSUpdate',
+        opts = {
+            ensure_installed = { "python", "go", "elixir", "heex", "rust", "gomod", "json", "lua", "yaml", "norg",
+                "query", "markdown", "markdown_inline", "gleam", "zig", "odin", "terraform", "hcl" }
+        },
+        config = function(_, opts)
+            -- Register parsers from opts.ensure_installed
+            register(opts.ensure_installed)
+
+            -- Create autocmd which installs and starts parsers.
+            install_and_start()
+        end
+    },
+}