module Rakka.Utils
- ( parseYesOrNo
+ ( yesOrNo
+ , parseYesOrNo
, maybeA
- , defaultTo
, deleteIfEmpty
+ , formatW3CDateTime
+ , chomp
)
where
import Control.Arrow
import Control.Arrow.ArrowList
+import System.Time
+import Text.Printf
+
+
+yesOrNo :: Bool -> String
+yesOrNo True = "yes"
+yesOrNo False = "no"
parseYesOrNo :: ArrowChoice a => a String Bool
(x:_) -> returnA -< Just x
-defaultTo :: ArrowChoice a => b -> a (Maybe b) b
-defaultTo def
- = proc m -> case m of
- Nothing -> returnA -< def
- Just x -> returnA -< x
-
-
deleteIfEmpty :: (ArrowList a, ArrowChoice a) => a String String
deleteIfEmpty
= proc str -> do case str of
"" -> none -< ()
- _ -> returnA -< str
\ No newline at end of file
+ _ -> returnA -< str
+
+
+formatW3CDateTime :: CalendarTime -> String
+formatW3CDateTime time
+ = formatDateTime time ++ formatTimeZone time
+ where
+ formatDateTime :: CalendarTime -> String
+ formatDateTime time
+ = printf "%04d-%02d-%02dT%02d:%02d:%02d"
+ (ctYear time)
+ (fromEnum (ctMonth time) + 1)
+ (ctDay time)
+ (ctHour time)
+ (ctMin time)
+ (ctSec time)
+
+ formatTimeZone :: CalendarTime -> String
+ formatTimeZone time
+ = case ctTZ time
+ of offset | offset < 0 -> '-':(showTZ $ negate offset)
+ | offset == 0 -> "Z"
+ | otherwise -> '+':(showTZ offset)
+
+ showTZ :: Int -> String
+ showTZ offset
+ = let hour = offset `div` 3600
+ min = (offset - hour * 3600) `div` 60
+ in
+ show2 hour ++ ":" ++ show2 min
+
+ show2 :: Int -> String
+ show2 n | n < 10 = '0':(show n)
+ | otherwise = show n
+
+
+chomp :: String -> String
+chomp = reverse . snd . break (/= '\n') . reverse