48 lines
1.3 KiB
Haskell
48 lines
1.3 KiB
Haskell
{- git ref stuff
|
|
-
|
|
- Copyright 2011 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Git.Ref where
|
|
|
|
import qualified Data.ByteString.Lazy.Char8 as L
|
|
|
|
import Common
|
|
import Git
|
|
import Git.Command
|
|
|
|
{- Converts a fully qualified git ref into a user-visible version. -}
|
|
describe :: Ref -> String
|
|
describe = remove "refs/heads/" . remove "refs/remotes/" . show
|
|
where
|
|
remove prefix s
|
|
| prefix `isPrefixOf` s = drop (length prefix) s
|
|
| otherwise = s
|
|
|
|
{- Checks if a ref exists. -}
|
|
exists :: Ref -> Repo -> IO Bool
|
|
exists ref = runBool "show-ref"
|
|
[Param "--verify", Param "-q", Param $ show ref]
|
|
|
|
{- Get the sha of a fully qualified git ref, if it exists. -}
|
|
sha :: Branch -> Repo -> IO (Maybe Sha)
|
|
sha branch repo = process . L.unpack <$> showref repo
|
|
where
|
|
showref = pipeRead [Param "show-ref",
|
|
Param "--hash", -- get the hash
|
|
Param $ show branch]
|
|
process [] = Nothing
|
|
process s = Just $ Ref $ firstLine s
|
|
|
|
{- List of (refs, branches) matching a given ref spec.
|
|
- Duplicate refs are filtered out. -}
|
|
matching :: Ref -> Repo -> IO [(Ref, Branch)]
|
|
matching ref repo = do
|
|
r <- pipeRead [Param "show-ref", Param $ show ref] repo
|
|
return $ nubBy uniqref $ map (gen . L.unpack) (L.lines r)
|
|
where
|
|
uniqref (a, _) (b, _) = a == b
|
|
gen l = let (r, b) = separate (== ' ') l in
|
|
(Ref r, Ref b)
|