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{- git repository handling -}
module GitRepo where
import Directory
import System.Directory
import Data.String.Utils
{- Returns the path to the current repository's .git directory.
- (For a bare repository, that is the root of the repository.) -}
gitDir :: IO String
gitDir = do
repo <- repoTop
bare <- isBareRepo repo
if (bare)
then return repo
else return $ repo ++ "/.git"
{- Finds the top of the current git repository, which may be in a parent
- directory. -}
repoTop :: IO String
repoTop = do
dir <- getCurrentDirectory
top <- seekUp dir isRepoTop
case top of
(Just dir) -> return dir
Nothing -> error "Not in a git repository."
seekUp :: String -> (String -> IO Bool) -> IO (Maybe String)
seekUp dir want = do
ok <- want dir
if ok
then return (Just dir)
else case (parentDir dir) of
(Just d) -> seekUp d want
Nothing -> return Nothing
parentDir :: String -> Maybe String
parentDir dir =
if length dirs > 0
then Just ("/" ++ (join "/" $ take ((length dirs) - 1) dirs))
else Nothing
where
dirs = filter (\x -> length x > 0) $ split "/" dir
isRepoTop dir = do
r <- isGitRepo dir
b <- isBareRepo dir
return (r || b)
isGitRepo dir = gitSignature dir ".git" ".git/config"
isBareRepo dir = gitSignature dir "objects" "config"
gitSignature dir subdir file = do
s <- (doesDirectoryExist (dir ++ "/" ++ subdir))
f <- (doesFileExist (dir ++ "/" ++ file))
return (s && f)
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