+{-# LANGUAGE
+ Arrows
+ , UnicodeSyntax
+ #-}
module Rakka.Utils
( yesOrNo
+ , trueOrFalse
, parseYesOrNo
, maybeA
, deleteIfEmpty
, chomp
+ , guessMIMEType
+ , isSafeChar
+ , mkQueryString
)
where
+import qualified Codec.Binary.Url as Url
+import Control.Arrow
+import Control.Arrow.ArrowList
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Lazy as LS
+import qualified Data.ByteString.Lazy.Char8 as L8
+import Data.List
+import qualified Data.Text as T
+import Data.Text.Encoding
+import Network.HTTP.Lucu
+import Network.URI
+import Prelude.Unicode
+import System.IO.Unsafe
-import Control.Arrow
-import Control.Arrow.ArrowList
-
-yesOrNo :: Bool -> String
+yesOrNo ∷ Bool → String
yesOrNo True = "yes"
yesOrNo False = "no"
-parseYesOrNo :: ArrowChoice a => a String Bool
+trueOrFalse ∷ Bool → String
+trueOrFalse True = "true"
+trueOrFalse False = "false"
+
+
+parseYesOrNo ∷ ArrowChoice a => a String Bool
parseYesOrNo
- = proc str -> do case str of
- "yes" -> returnA -< True
- "no" -> returnA -< False
- _ -> returnA -< error ("Expected yes or no: " ++ str)
+ = proc str → do case str of
+ "yes" → returnA -< True
+ "no" → returnA -< False
+ _ → returnA -< error ("Expected yes or no: " ⧺ str)
-maybeA :: (ArrowList a, ArrowChoice a) => a b c -> a b (Maybe c)
+maybeA ∷ (ArrowList a, ArrowChoice a) => a b c → a b (Maybe c)
maybeA a = listA a
>>>
- proc xs -> case xs of
- [] -> returnA -< Nothing
- (x:_) -> returnA -< Just x
+ proc xs → case xs of
+ [] → returnA -< Nothing
+ (x:_) → returnA -< Just x
-deleteIfEmpty :: (ArrowList a, ArrowChoice a) => a String String
+deleteIfEmpty ∷ (ArrowList a, ArrowChoice a) => a String String
deleteIfEmpty
- = proc str -> do case str of
- "" -> none -< ()
- _ -> returnA -< str
+ = proc str → do case str of
+ "" → none -< ()
+ _ → returnA -< str
-chomp :: String -> String
+chomp ∷ String → String
chomp = reverse . snd . break (/= '\n') . reverse
+
+
+guessMIMEType ∷ LS.ByteString → MIMEType
+guessMIMEType = read . unsafePerformIO . magicString magic . L8.unpack
+ where
+ magic ∷ Magic
+ magic = unsafePerformIO
+ $ do m <- magicOpen [MagicMime]
+ magicLoadDefault m
+ return m
+
+
+isSafeChar ∷ Char → Bool
+isSafeChar c
+ | c ≡ '/' = True
+ | isReserved c = False
+ | isUnreserved c = True
+ | otherwise = False
+
+
+mkQueryString ∷ [(T.Text, T.Text)] → String
+{-# INLINEABLE mkQueryString #-}
+mkQueryString = intercalate ";" ∘ map pairToStr
+ where
+ pairToStr ∷ (T.Text, T.Text) → String
+ {-# INLINE pairToStr #-}
+ pairToStr (k, v)
+ = encode k ⧺ ('=':encode v)
+
+ encode ∷ T.Text → String
+ {-# INLINE encode #-}
+ encode = Url.encode ∘ BS.unpack ∘ encodeUtf8