split more stuff out of Git.hs

Git/Url.hs

@@ -0,0 +1,70 @@
+{- git repository urls
+ -
+ - Copyright 2010, 2011 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Git.Url (
+	scheme,
+	host,
+	port,
+	hostuser,
+	authority,
+) where
+
+import Network.URI hiding (scheme, authority)
+
+import Common
+import Git.Types
+import Git
+
+{- Scheme of an URL repo. -}
+scheme :: Repo -> String
+scheme Repo { location = Url u } = uriScheme u
+scheme repo = notUrl repo
+
+{- Work around a bug in the real uriRegName
+ - <http://trac.haskell.org/network/ticket/40> -}
+uriRegName' :: URIAuth -> String
+uriRegName' a = fixup $ uriRegName a
+	where
+		fixup x@('[':rest)
+			| rest !! len == ']' = take len rest
+			| otherwise = x
+			where
+				len  = length rest - 1
+		fixup x = x
+
+{- Hostname of an URL repo. -}
+host :: Repo -> String
+host = authpart uriRegName'
+
+{- Port of an URL repo, if it has a nonstandard one. -}
+port :: Repo -> Maybe Integer
+port r = 
+	case authpart uriPort r of
+		":" -> Nothing
+		(':':p) -> readMaybe p
+		_ -> Nothing
+
+{- Hostname of an URL repo, including any username (ie, "user@host") -}
+hostuser :: Repo -> String
+hostuser r = authpart uriUserInfo r ++ authpart uriRegName' r
+
+{- The full authority portion an URL repo. (ie, "user@host:port") -}
+authority :: Repo -> String
+authority = authpart assemble
+	where
+		assemble a = uriUserInfo a ++ uriRegName' a ++ uriPort a
+
+{- Applies a function to extract part of the uriAuthority of an URL repo. -}
+authpart :: (URIAuth -> a) -> Repo -> a
+authpart a Repo { location = Url u } = a auth
+	where
+		auth = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u)
+authpart _ repo = notUrl repo
+
+notUrl :: Repo -> a
+notUrl repo = error $
+	"acting on local git repo " ++ repoDescribe repo ++ " not supported"