1 files changed, 80 insertions, 0 deletions
diff --git a/src/Diddo.hs b/src/Diddo.hs
new file mode 100644
index 0000000..2100b25
--- /dev/null
+++ b/src/Diddo.hs
@@ -0,0 +1,80 @@
+{-# LANGUAGE OverloadedStrings #-}
+
+module Diddo
+( LogEntry(LogEntry)
+, Diddo(Diddo)
+, formatDiddo
+, parseDiddoLogline
+, logToDiddo
+, parseToZonedTime
+) where
+
+import Data.Maybe( fromMaybe )
+import Data.Time.Clock( UTCTime(), NominalDiffTime(), diffUTCTime )
+import Data.Time.Format( FormatTime(), parseTime, formatTime )
+import Data.Time.LocalTime( TimeZone(), ZonedTime(..), zonedTimeToUTC, utcToZonedTime )
+import Text.Parsec
+import System.Locale
+import Text.Printf( printf )
+import qualified Data.Text as T
+
+data LogEntry = LogEntry
+    { timestamp     :: UTCTime
+    , timezone      :: TimeZone
+    , text          :: T.Text
+    }
+
+data Diddo = Diddo
+    { startTime     :: ZonedTime
+    , endTime       :: ZonedTime
+    , comment       :: T.Text
+    }
+
+getTimestamp :: Diddo -> UTCTime
+getTimestamp = zonedTimeToUTC . endTime
+
+formatDiddo :: String -> Diddo -> T.Text
+formatDiddo format (Diddo start end text) = T.intercalate ";" diddoline
+    where
+        diddoline           = [startZonedString, endZonedString, delta, text]
+        startZonedString    = timeToText format start
+        endZonedString      = timeToText format end
+        startUTC            = zonedTimeToUTC start
+        endUTC              = zonedTimeToUTC end
+        delta               = diffTimeToHMSString $ diffUTCTime endUTC startUTC
+
+timeToText :: FormatTime a => String -> a -> T.Text
+timeToText format = T.pack . formatTime defaultTimeLocale format
+
+logToDiddo :: UTCTime -> LogEntry -> Diddo
+logToDiddo startutc logentry = Diddo startZoned endZoned $ text logentry
+    where
+        startZoned = utcToZonedTime (timezone logentry) startutc
+        endZoned = utcToZonedTime (timezone logentry) $ timestamp logentry
+
+-- parseDiddoLogline' :: T.Text -> (UTCTime, LogEntry)
+-- parseDiddoLogline' line = (ts, LogEntry ts tz string)
+
+parseDiddoLogline :: T.Text -> (UTCTime, LogEntry)
+parseDiddoLogline line = (ts, LogEntry ts tz string)
+    where
+        (timestring:strings)    = T.splitOn ";" line
+        string                  = T.intercalate ";" strings
+        time                    = parseISOsecondsTime timestring
+        (ts,tz)                 = (zonedTimeToUTC time, zonedTimeZone time)
+
+parseToZonedTime :: String -> String -> ZonedTime
+parseToZonedTime format string = zt
+    where
+        zt = fromMaybe (error $ "Input data broken: " ++ string) parsedTime
+        parsedTime = parseTime defaultTimeLocale format string
+
+parseISOsecondsTime :: T.Text -> ZonedTime
+parseISOsecondsTime timestring = parseToZonedTime (iso8601DateFormat $ Just "%T%z") $ T.unpack timestring
+
+diffTimeToHMSString :: NominalDiffTime -> T.Text
+diffTimeToHMSString delta = T.pack $ printf "%d:%02d:%02d" h m s
+    where
+        (mLeft, s) = floor delta `divMod` 60 :: (Int, Int)
+        (h, m)     = mLeft `divMod` 60
+