module Users
  # Helpers for Users
  module OsxHelper
    def dscl(*args)
      host = '.'
      stdout_result = ''
      stderr_result = ''
      cmd = "dscl #{host} -#{args.join(' ')}"
      status = shell_out(cmd)
      status.stdout.each_line { |line| stdout_result << line }
      status.stderr.each_line { |line| stderr_result << line }
      [cmd, status, stdout_result, stderr_result]
    end

    def safe_dscl(*args)
      result = dscl(*args)
      return '' if (args.first =~ /^delete/) && (result[1].exitstatus != 0)
      raise(Chef::Exceptions::Group, "dscl error: #{result.inspect}") unless result[1].exitstatus == 0
      raise(Chef::Exceptions::Group, "dscl error: #{result.inspect}") if result[2] =~ /No such key: /
      result[2]
    end

    def gid_used?(gid)
      return false unless gid
      groups_gids = safe_dscl('list /Groups gid')
      !!(groups_gids =~ Regexp.new("#{Regexp.escape(gid.to_s)}\n"))
    end
  end
end