1 files changed, 114 insertions, 0 deletions
diff --git a/src/Main.hs b/src/Main.hs
new file mode 100644
index 0000000..6884d14
--- /dev/null
+++ b/src/Main.hs
@@ -0,0 +1,114 @@
+import Control.Applicative( (<$>) )
+import Control.Monad( unless )
+import Data.Time.Clock( UTCTime(..) )
+import Data.Time.LocalTime( TimeZone(), ZonedTime(..), zonedTimeToUTC, utcToZonedTime )
+import Diddo( Diddo(..), LogEntry(..), parseDiddoLogline, formatDiddo, logToDiddo, parseToZonedTime )
+import System.Console.GetOpt
+import System.Environment( getArgs )
+import System.Exit( exitSuccess, exitFailure )
+import System.IO( stderr, hPutStr )
+import qualified Data.Map as Map
+import qualified Data.Text as T
+import qualified Data.Text.IO as TIO
+
+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 Diddos
+logentryMapToDiddoMap :: Map.Map UTCTime Diddo.LogEntry -> Map.Map UTCTime Diddo.Diddo
+logentryMapToDiddoMap logmap = Map.mapWithKey toDddEntry logmap
+    where
+        toDddEntry key value    = Diddo.logToDiddo (precedingTimestamp key) value
+        precedingTimestamp x    = case Map.lookupLT x logmap of
+            Just (y,_)          -> y
+            Nothing             -> fst $ Map.findMin logmap
+-- SECTION: Map of logentries to Map of DiddoEntries
+
+main :: IO ()
+main = do
+    -- SECTION: option processing
+    (givenOptions,args,errs) <- getArgs >>= return . getOpt Permute availableOptions
+
+    unless (null errs) $ do
+        mapM_ (hPutStr stderr) errs
+        exitFailure
+
+    effectiveOptions <- foldl (>>=) (return defaultOpts) givenOptions
+
+    let
+        inDateFmt               = optInputFormat effectiveOptions
+        outDateFmt              = optOutputFormat effectiveOptions
+
+        startDate               = parseToZonedTime inDateFmt $ optStartDate effectiveOptions
+        endDate                 = parseToZonedTime inDateFmt $ optEndDate effectiveOptions
+    -- SECTION: option processing
+
+    loglines <- case optInputFiles effectiveOptions of
+            files@(_:_)     -> T.lines . T.concat <$> mapM TIO.readFile files
+            []              -> T.lines <$> TIO.getContents
+
+    let
+        timestampLogentryMap                        = Map.fromList $ map Diddo.parseDiddoLogline loglines
+        (_, _, startedTimestampLogentryMap)         = Map.splitLookup (zonedTimeToUTC startDate) timestampLogentryMap
+        (endedTimestampLogentryMap, lastEntry, _)   = Map.splitLookup (zonedTimeToUTC endDate) startedTimestampLogentryMap
+        timestampDiddoMap                           = logentryMapToDiddoMap timestampLogentryMap
+
+    -- DEBUG
+    mapM_ putStrLn args
+    -- DEBUG
+
+    mapM_ (TIO.putStrLn . snd) $ Map.toAscList $ Map.map (Diddo.formatDiddo outDateFmt) timestampDiddoMap
+