fix: change config for treesitter

Both `install()` and `get_available()` are nil which causes the error
while spawning nvim and make the treesitter not working.

Replacing the custom `FileType` autocmd and manual parser attachment
logic with the standard `nvim-treesitter.configs` setup function
seems to work fine.

Author: Jazzcort

init.lua

@@ -888,53 +888,49 @@ require('lazy').setup({
     branch = 'main',
     -- [[ Configure Treesitter ]] See `:help nvim-treesitter-intro`
     config = function()
-      -- ensure basic parser are installed
-      local parsers = { 'bash', 'c', 'diff', 'html', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'vim', 'vimdoc' }
-      require('nvim-treesitter').install(parsers)
-
-      ---@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 highlighting and other treesitter features
-        vim.treesitter.start(buf, language)
-
-        -- enables treesitter based folds
-        -- for more info on folds see `:help folds`
-        -- vim.wo.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
-        -- vim.wo.foldmethod = 'expr'
-
-        -- check if treesitter indentation is available for this language, and if so enable it
-        -- in case there is no indent query, the indentexpr will fallback to the vim's built in one
-        local has_indent_query = vim.treesitter.query.get(language, 'indents') ~= nil
-
-        -- enables treesitter based indentation
-        if has_indent_query then vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()" end
-      end
+      require('nvim-treesitter.configs').setup {
+        -- Added to appease the Lua Language Server strict typing
+        modules = {},
+        ignore_install = {},
+
+        -- Ensure these basic parsers are installed
+        ensure_installed = {
+          'bash',
+          'c',
+          'diff',
+          'html',
+          'lua',
+          'luadoc',
+          'markdown',
+          'markdown_inline',
+          'query',
+          'vim',
+          'vimdoc'
+        },
 
-      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` auto install it, and enable it after the installation is done
-            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,
-      })
+        -- Automatically install missing parsers when entering a buffer
+        auto_install = true,
+
+        -- Install parsers synchronously (only applied to `ensure_installed`)
+        sync_install = false,
+
+        -- Enable syntax highlighting
+        highlight = {
+          enable = true,
+          -- Some languages depend on vim's regex highlighting system (such as Ruby) for indent rules.
+          -- If you are experiencing weird indenting issues, add the language to the list of additional_vim_regex_highlighting and disabled languages for indent.
+          additional_vim_regex_highlighting = false,
+        },
+
+        -- Enable treesitter-based indentation
+        indent = {
+          enable = true,
+        },
+      }
+
+      -- If you want to enable your treesitter-based folds, you can keep this here:
+      -- vim.wo.foldexpr = 'v:lua.vim.treesitter.foldexpr()'
+      -- vim.wo.foldmethod = 'expr'
     end,
   },