+import System.Exit( exitSuccess, exitFailure )
+import System.IO( stderr, hPutStr )
+
+data Opt = Opt
+ { optVerbose :: Bool
+ , optVersion :: Bool
+ , optHelp :: Bool
+ , optInputFiles :: [String]
+ , optOutputFile :: String
+ , optInputFormat :: String
+ , optOutputFormat :: String
+ , optStartDate :: String
+ , optEndDate :: String
+ }
+
+defaultOpts :: Opt
+defaultOpts = Opt
+ { optVerbose = False
+ , optVersion = False
+ , optHelp = False
+ , optInputFiles = []
+ , optOutputFile = ""
+ , optInputFormat = "%FT%T%z"
+ , optOutputFormat = "%FT%T%z"
+ , optStartDate = ""
+ , optEndDate = ""
+ }
+
+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"
+ ]
+
+-- SECTION: Map of logentries to Map of DiddoEntries
+mapToDiddoEntries :: Map.Map UTCTime Diddo.LogEntry -> Map.Map UTCTime Diddo.DiddoEntry
+mapToDiddoEntries logmap = Map.mapWithKey toDddEntry logmap
+ where
+ toDddEntry key value = Diddo.logToDiddoEntry (preceedingTimestamp key) value
+ preceedingTimestamp x = case Map.lookupLT x logmap of
+ Just y -> fst y
+ Nothing -> fst $ Map.findMin logmap
+-- SECTION: Map of logentries to Map of DiddoEntries