90 lines
2.4 KiB
Haskell
90 lines
2.4 KiB
Haskell
{- git repository handling -}
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module GitRepo where
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import Directory
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import System.Directory
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import System.Path
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import Data.String.Utils
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import Utility
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import Types
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import BackendList
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{- GitRepo constructor -}
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gitRepo :: FilePath -> IO GitRepo
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gitRepo dir = do
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-- TOOD query repo for configuration settings; other repositories; etc
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return GitRepo {
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top = dir,
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remotes = [],
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backends = supportedBackends
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}
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{- Path to a repository's gitattributes file. -}
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gitAttributes :: GitRepo -> IO String
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gitAttributes repo = do
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bare <- isBareRepo (top repo)
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if (bare)
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then return $ (top repo) ++ "/info/.gitattributes"
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else return $ (top repo) ++ "/.gitattributes"
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{- Path to a repository's .git directory.
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- (For a bare repository, that is the root of the repository.)
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- TODO: support GIT_DIR -}
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gitDir :: GitRepo -> IO String
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gitDir repo = do
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bare <- isBareRepo (top repo)
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if (bare)
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then return $ (top repo)
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else return $ (top repo) ++ "/.git"
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{- Given a relative or absolute filename, calculates the name to use
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- to refer to the file relative to a git repository directory.
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- This is the same form displayed and used by git. -}
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gitRelative :: GitRepo -> String -> String
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gitRelative repo file = drop (length absrepo) absfile
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where
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-- normalize both repo and file, so that repo
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-- will be substring of file
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absrepo = case (absNormPath "/" (top repo)) of
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Just f -> f ++ "/"
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Nothing -> error $ "bad repo" ++ (top repo)
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absfile = case (secureAbsNormPath absrepo file) of
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Just f -> f
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Nothing -> error $ file ++ " is not located inside git repository " ++ absrepo
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{- Stages a changed file in git's index. -}
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gitAdd repo file = do
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-- TODO
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return ()
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{- Finds the current git repository, which may be in a parent directory. -}
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currentRepo :: IO GitRepo
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currentRepo = do
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cwd <- getCurrentDirectory
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top <- seekUp cwd isRepoTop
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case top of
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(Just dir) -> gitRepo dir
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Nothing -> error "Not in a git repository."
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seekUp :: String -> (String -> IO Bool) -> IO (Maybe String)
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seekUp dir want = do
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ok <- want dir
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if ok
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then return (Just dir)
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else case (parentDir dir) of
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"" -> return Nothing
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d -> seekUp d want
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isRepoTop dir = do
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r <- isGitRepo dir
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b <- isBareRepo dir
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return (r || b)
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isGitRepo dir = gitSignature dir ".git" ".git/config"
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isBareRepo dir = gitSignature dir "objects" "config"
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gitSignature dir subdir file = do
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s <- (doesDirectoryExist (dir ++ "/" ++ subdir))
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f <- (doesFileExist (dir ++ "/" ++ file))
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return (s && f)
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