lualine.nvim/lua/lualine/components/fileformat.lua

-- Copyright (c) 2020-2021 shadmansaleh
-- MIT license, see LICENSE for more details.
local function fileformat(options)
  local icon_linux = '' -- e712
  local icon_windos = '' -- e70f
  local icon_mac = '' -- e711
  return function()
    if options.icons_enabled and not options.icon then
      local format = vim.bo.fileformat
      if format == 'unix' then
        return icon_linux
      elseif format == 'dos' then
        return icon_windos
      elseif format == 'mac' then
        return icon_mac
      end
    end
    return vim.bo.fileformat
  end
end

return {init = function(options) return fileformat(options) end}