Add treesitter indentation

Author: oriori1703

init.lua

@@ -882,6 +882,7 @@ require('lazy').setup({
     lazy = false,
     build = ':TSUpdate',
     branch = 'main',
+    -- [[ Configure Treesitter ]] See `:help nvim-treesitter-intro`
     config = function()
       local parsers = { 'bash', 'c', 'diff', 'html', 'lua', 'luadoc', 'markdown', 'markdown_inline', 'query', 'vim', 'vimdoc' }
       require('nvim-treesitter').install(parsers)
@@ -890,9 +891,20 @@ require('lazy').setup({
           local buf, filetype = args.buf, args.match
 
           local language = vim.treesitter.language.get_lang(filetype)
-          if not vim.tbl_contains(parsers, language) then return end
+          if not language then return end
 
-          vim.treesitter.start()
+          -- 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'
+
+          -- enables treesitter based indentation
+          vim.bo.indentexpr = "v:lua.require'nvim-treesitter'.indentexpr()"
         end,
       })
     end,