-import Control.Concurrent (forkIO, threadDelay)
-import Control.Monad (forever, when)
-import Data.Aeson (decode)
-import Data.List ((\\))
-import Data.Monoid ((<>))
-import Data.Time.LocalTime (TimeZone, getCurrentTimeZone)
-import System.Exit (ExitCode(..), exitWith)
-import System.IO (hPutStrLn, stderr)
-
-import CommandLine
-import Configuration (Cfg(..), default_config, merge_optional)
-import ExitCodes (exit_no_usernames)
-import qualified OptionalConfiguration as OC
+import Control.Concurrent ( forkIO, threadDelay )
+import Control.Monad ( forever, when )
+import Data.Aeson ( decode )
+import Data.Maybe ( fromMaybe, isNothing )
+import Data.Monoid ( (<>) )
+import Data.Time.LocalTime ( TimeZone, getCurrentTimeZone )
+import System.Console.CmdArgs.Default ( Default(..) )
+import System.Exit ( ExitCode(..), exitWith )
+import System.IO ( hPutStrLn, stderr )
+
+import CommandLine ( get_args, show_help )
+import Configuration ( Cfg(..), merge_optional )
+import ExitCodes ( exit_no_usernames )
+import qualified OptionalConfiguration as OC ( from_rc )