Unfoldable Dispatcher

[Lucu.git] / Network / HTTP / Lucu / Utils.hs

diff --git a/Network/HTTP/Lucu/Utils.hs b/Network/HTTP/Lucu/Utils.hs
index 18370fab68cc3aa673b1ef6a85bf11bd3a87eb25..1070d66f28042193a0337b02f1e9d858d63c9403 100644 (file)
--- a/Network/HTTP/Lucu/Utils.hs
+++ b/Network/HTTP/Lucu/Utils.hs
@@ -1,7 +1,6 @@
 {-# LANGUAGE
-    OverloadedStrings
-  , RecordWildCards
-  , TemplateHaskell
+    FlexibleContexts
+  , OverloadedStrings
   , UnicodeSyntax
   #-}
 -- |Utility functions used internally in this package.
@@ -9,37 +8,35 @@ module Network.HTTP.Lucu.Utils
     ( splitBy
     , quoteStr
     , parseWWWFormURLEncoded
-    , splitPathInfo
+    , uriPathSegments
     , trim
-    , liftByteString
-    , liftLazyByteString
-    , liftAscii
-    , liftCIAscii
-    , liftText
-    , liftMap
-    , liftUTCTime
+
+    , (⊲)
+    , (⊳)
+    , (⋈)
+    , mapM
+
+    , getLastModified
     )
     where
-import Control.Monad
-import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
+import Control.Applicative hiding (empty)
+import Control.Monad hiding (mapM)
+import Data.Ascii (Ascii, AsciiBuilder)
 import qualified Data.Ascii as A
 import Data.ByteString (ByteString)
 import qualified Data.ByteString.Char8 as Strict
-import qualified Data.ByteString.Lazy.Internal as Lazy
 import Data.Char
-import Data.List hiding (last)
-import Data.Map (Map)
-import qualified Data.Map as M
+import Data.Collections
+import Data.Collections.BaseInstances ()
 import Data.Monoid.Unicode
 import Data.Ratio
-import Data.Text (Text)
-import qualified Data.Text as T
 import Data.Time
-import Language.Haskell.TH.Lib
-import Language.Haskell.TH.Syntax
+import Data.Time.Clock.POSIX
 import Network.URI
-import Prelude hiding (last)
+import Prelude hiding (last, mapM, null, reverse)
 import Prelude.Unicode
+import System.Directory
+import System.Time (ClockTime(..))
 
 -- |>>> splitBy (== ':') "ab:c:def"
 -- ["ab", "c", "def"]
@@ -89,20 +86,20 @@ parseWWWFormURLEncoded src
                             )
     where
       unescape ∷ String → ByteString
-      unescape = Strict.pack ∘ unEscapeString ∘ map plusToSpace
+      unescape = Strict.pack ∘ unEscapeString ∘ (plusToSpace <$>)
 
       plusToSpace ∷ Char → Char
       plusToSpace '+' = ' '
       plusToSpace c   = c
 
--- |>>> splitPathInfo "http://example.com/foo/bar"
+-- |>>> uriPathSegments "http://example.com/foo/bar"
 -- ["foo", "bar"]
-splitPathInfo ∷ URI → [ByteString]
-splitPathInfo uri
+uriPathSegments ∷ URI → [ByteString]
+uriPathSegments uri
     = let reqPathStr = uriPath uri
           reqPath    = [unEscapeString x | x ← splitBy (≡ '/') reqPathStr, (¬) (null x)]
       in
-        map Strict.pack reqPath
+        Strict.pack <$> reqPath
 
 -- |>>> trim "  ab c d "
 -- "ab c d"
@@ -111,53 +108,39 @@ trim = reverse ∘ f ∘ reverse ∘ f
     where
       f = dropWhile isSpace
 
--- |Convert a 'ByteString' to an 'Exp' representing it as a literal.
-liftByteString ∷ ByteString → Q Exp
-liftByteString bs
-    = [| Strict.pack $(litE $ stringL $ Strict.unpack bs) |]
-
--- |Convert a 'Lazy.ByteString' to an 'Exp' representing it as a
--- literal.
-liftLazyByteString ∷ Lazy.ByteString → Q Exp
-liftLazyByteString = Lazy.foldrChunks f [| Lazy.Empty |]
-    where
-      f ∷ ByteString → Q Exp → Q Exp
-      f bs e = [| Lazy.Chunk $(liftByteString bs) $e |]
-
--- |Convert an 'Ascii' to an 'Exp' representing it as a literal.
-liftAscii ∷ Ascii → Q Exp
-liftAscii a = [| A.unsafeFromByteString $(liftByteString $ A.toByteString a) |]
-
--- |Convert a 'CIAscii' to an 'Exp' representing it as a literal.
-liftCIAscii ∷ CIAscii → Q Exp
-liftCIAscii a = [| A.toCIAscii $(liftAscii $ A.fromCIAscii a) |]
-
--- |Convert a 'Text' to an 'Exp' representing it as a literal.
-liftText ∷ Text → Q Exp
-liftText t = [| T.pack $(litE $ stringL $ T.unpack t) |]
-
--- |Convert an arbitrary 'Map' to an 'Exp' representing it as a
--- literal, using a given key lifter and a value lifter.
-liftMap ∷ Eq k ⇒ (k → Q Exp) → (v → Q Exp) → Map k v → Q Exp
-liftMap liftK liftV m
-    | M.null m  = [| M.empty |]
-    | otherwise = [| M.fromDistinctAscList $(liftPairs (M.toAscList m)) |]
-    where
-      liftPairs       = listE ∘ map liftPair
-      liftPair (k, v) = tupE [liftK k, liftV v]
-
--- |Convert an 'UTCTime' to an 'Exp' representing it as a literal.
-liftUTCTime ∷ UTCTime → Q Exp
-liftUTCTime (UTCTime {..})
-    = [| UTCTime $(liftDay utctDay) $(liftDiffTime utctDayTime) |]
+infixr 5 ⊲
+-- | (&#22B2;) = ('<|')
+--
+-- U+22B2, NORMAL SUBGROUP OF
+(⊲) ∷ Sequence α a ⇒ a → α → α
+(⊲) = (<|)
 
-liftDay ∷ Day → Q Exp
-liftDay (ModifiedJulianDay {..})
-    = [| ModifiedJulianDay $(lift toModifiedJulianDay) |]
+infixl 5 ⊳
+-- | (&#22B3;) = ('|>')
+--
+-- U+22B3, CONTAINS AS NORMAL SUBGROUP
+(⊳) ∷ Sequence α a ⇒ α → a → α
+(⊳) = (|>)
 
-liftDiffTime ∷ DiffTime → Q Exp
-liftDiffTime dt = [| fromRational ($n % $d) ∷ DiffTime |]
+infixr 5 ⋈
+-- | (&#22C8;) = ('><')
+--
+-- U+22C8, BOWTIE
+(⋈) ∷ Sequence α a ⇒ α → α → α
+(⋈) = (><)
+
+-- |Generalised @mapM@ from any 'Foldable' to 'Unfoldable'. Why isn't
+-- this in the @collections-api@?
+mapM ∷ (Foldable α a, Unfoldable β b, Functor m, Monad m)
+     ⇒ (a → m b) → α → m β
+{-# INLINE mapM #-}
+mapM = flip foldrM empty ∘ (flip ((<$>) ∘ flip insert) ∘)
+
+-- |Get the modification time of a given file.
+getLastModified ∷ FilePath → IO UTCTime
+getLastModified = (clockTimeToUTC <$>) ∘ getModificationTime
     where
-      n, d ∷ Q Exp
-      n = lift $ numerator   $ toRational dt
-      d = lift $ denominator $ toRational dt
+      clockTimeToUTC ∷ ClockTime → UTCTime
+      clockTimeToUTC (TOD sec picoSec)
+          = posixSecondsToUTCTime ∘ fromRational
+            $ sec % 1 + picoSec % (1000 ⋅ 1000 ⋅ 1000 ⋅ 1000)