+availableOptions :: [OptDescr (Opt -> IO Opt)]
+availableOptions =
+ [ Option ['h'] ["help"]
+ (NoArg (\ _ -> putStrLn (usageInfo "Usage: diddohs [OPTION...]" availableOptions) >> exitSuccess))
+ "Display program help"
+ , Option ['v'] ["verbose"]
+ (NoArg (\ opts -> return opts { optVerbose = True }))
+ "More detailed output"
+ , Option ['V'] ["version"]
+ (NoArg (\ opts -> return opts { optVersion = True }))
+ "Display program version"
+ , Option ['f'] ["file"]
+ (ReqArg (\ arg opts -> return opts { optInputFiles = optInputFiles opts ++ [arg]}) "FILE" )
+ "Read from FILE"
+ , Option ['w'] ["output"]
+ (ReqArg (\ arg opts -> return opts { optOutputFile = arg }) "FILE")
+ "Write to FILE"
+ , Option ['i'] ["informat"]
+ (ReqArg (\ arg opts -> return opts { optInputFormat = arg }) "FORMAT")
+ "Timeformat used in input"
+ , Option ['o'] ["outformat"]
+ (ReqArg (\ arg opts -> return opts { optOutputFormat = arg }) "FORMAT")
+ "Timeformat used in output"
+ , Option ['s'] ["start"]
+ (ReqArg (\ arg opts -> return opts { optStartDate = arg }) "DATE")
+ "Start of reporting period"
+ , Option ['e'] ["end"]
+ (ReqArg (\ arg opts -> return opts { optEndDate = arg }) "DATE")
+ "End of reporting period"
+ ]