vim.api.nvim_create_autocmd({ 'BufRead', 'BufNewFile' }, {
  group = vim.api.nvim_create_augroup('gotmpl_highlight', { clear = true }),
  pattern = '*.tmpl',
  callback = function()
    local filename = vim.fn.expand('%:t')
    local ext = filename:match('.*%.(.-)%.tmpl$')

    -- Add more extension to syntax mappings here if you need to.
    local ext_filetypes = {
      go = 'go',
      html = 'html',
      md = 'markdown',
      yaml = 'yaml',
      yml = 'yaml',
      -- cc = 'cpp',
      -- h = 'cpp',
    }

    if ext and ext_filetypes[ext] then
      -- Set the primary filetype
      vim.bo.filetype = ext_filetypes[ext]

      -- Define embedded Go template syntax
      vim.cmd([[
        syntax include @gotmpl syntax/gotmpl.vim
        syntax region gotmpl start="{{" end="}}" contains=@gotmpl containedin=ALL
        syntax region gotmpl start="{%" end="%}" contains=@gotmpl containedin=ALL
      ]])
    end
  end,
})