{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeFamilies #-}
module HaskellWorks.CabalCache.Location
( IsPath(..)
, Location(..)
, toLocation
)
where
import Antiope.Core (ToText (..), fromText)
import Antiope.S3 (ObjectKey (..), S3Uri (..))
import Data.Maybe (fromMaybe)
import Data.Text (Text)
import GHC.Generics (Generic)
import qualified Data.Text as T
import qualified System.FilePath as FP
class IsPath a s | a -> s where
(</>) :: a -> s -> a
(<.>) :: a -> s -> a
infixr 5 </>
infixr 7 <.>
data Location
= S3 S3Uri
| Local FilePath
| HttpUri Text
deriving (Show, Eq, Generic)
instance ToText Location where
toText (S3 uri) = toText uri
toText (Local p) = T.pack p
toText (HttpUri uri) = uri
instance IsPath Location Text where
(S3 b) </> p = S3 (b </> p)
(Local b) </> p = Local (b </> T.unpack p)
(HttpUri b) </> p = HttpUri (b </> p)
(S3 b) <.> e = S3 (b <.> e)
(Local b) <.> e = Local (b <.> T.unpack e)
(HttpUri b) <.> e = HttpUri (b <.> e)
instance IsPath Text Text where
b </> p = T.pack (T.unpack b FP.</> T.unpack p)
b <.> e = T.pack (T.unpack b FP.<.> T.unpack e)
instance (a ~ Char) => IsPath [a] [a] where
b </> p = b FP.</> p
b <.> e = b FP.<.> e
instance IsPath S3Uri Text where
S3Uri b (ObjectKey k) </> p =
S3Uri b (ObjectKey (stripEnd "/" k <> "/" <> stripStart "/" p))
S3Uri b (ObjectKey k) <.> e =
S3Uri b (ObjectKey (stripEnd "." k <> "." <> stripStart "." e))
toLocation :: Text -> Maybe Location
toLocation txt = if
| T.isPrefixOf "s3://" txt' -> either (const Nothing) (Just . S3) (fromText txt')
| T.isPrefixOf "file://" txt' -> Just (Local (T.unpack txt'))
| T.isPrefixOf "http://" txt' -> Just (HttpUri txt')
| T.isInfixOf "://" txt' -> Nothing
| otherwise -> Just (Local (T.unpack txt'))
where txt' = T.strip txt
stripStart :: Text -> Text -> Text
stripStart what txt = fromMaybe txt (T.stripPrefix what txt)
stripEnd :: Text -> Text -> Text
stripEnd what txt = fromMaybe txt (T.stripSuffix what txt)