return function(group, bg, fg, gui)
  if gui ~= nil and gui ~= '' then
    vim.api.nvim_command(('hi %s guibg=%s guifg=%s gui=%s'):format(group, bg, fg, gui))
  elseif bg == nil then
    vim.api.nvim_command(('hi %s guifg=%s'):format(group, fg))
  else
    vim.api.nvim_command(('hi %s guibg=%s guifg=%s'):format(group, bg, fg))
  end
end