667 lines
21 KiB
Haskell
667 lines
21 KiB
Haskell
{- git repository handling
|
|
-
|
|
- This is written to be completely independant of git-annex and should be
|
|
- suitable for other uses.
|
|
-
|
|
- Copyright 2010 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module GitRepo (
|
|
Repo,
|
|
repoFromCwd,
|
|
repoFromAbsPath,
|
|
repoFromUnknown,
|
|
repoFromUrl,
|
|
localToUrl,
|
|
repoIsUrl,
|
|
repoIsSsh,
|
|
repoIsLocalBare,
|
|
repoDescribe,
|
|
repoLocation,
|
|
workTree,
|
|
workTreeFile,
|
|
gitDir,
|
|
urlPath,
|
|
urlHost,
|
|
urlPort,
|
|
urlHostUser,
|
|
urlAuthority,
|
|
urlScheme,
|
|
configGet,
|
|
configMap,
|
|
configRead,
|
|
hConfigRead,
|
|
configStore,
|
|
configTrue,
|
|
gitCommandLine,
|
|
run,
|
|
pipeRead,
|
|
attributes,
|
|
remotes,
|
|
remotesAdd,
|
|
repoRemoteName,
|
|
repoRemoteNameSet,
|
|
inRepo,
|
|
notInRepo,
|
|
stagedFiles,
|
|
stagedFilesNotDeleted,
|
|
changedUnstagedFiles,
|
|
checkAttr,
|
|
decodeGitFile,
|
|
encodeGitFile,
|
|
typeChangedFiles,
|
|
typeChangedStagedFiles,
|
|
repoAbsPath,
|
|
reap,
|
|
|
|
prop_idempotent_deencode
|
|
) where
|
|
|
|
import Control.Monad (unless)
|
|
import System.Directory
|
|
import System.FilePath
|
|
import System.Posix.Directory
|
|
import System.Posix.User
|
|
import System.Posix.Process
|
|
import System.Path
|
|
import System.Cmd.Utils
|
|
import IO (bracket_)
|
|
import Data.String.Utils
|
|
import System.IO
|
|
import qualified Data.Map as Map hiding (map, split)
|
|
import Network.URI
|
|
import Data.Maybe
|
|
import Data.Char
|
|
import Data.Word (Word8)
|
|
import Codec.Binary.UTF8.String (encode)
|
|
import Text.Printf
|
|
import Data.List (isInfixOf, isPrefixOf, isSuffixOf)
|
|
import System.Exit
|
|
|
|
import Utility
|
|
|
|
{- There are two types of repositories; those on local disk and those
|
|
- accessed via an URL. -}
|
|
data RepoLocation = Dir FilePath | Url URI | Unknown
|
|
deriving (Show, Eq)
|
|
|
|
data Repo = Repo {
|
|
location :: RepoLocation,
|
|
config :: Map.Map String String,
|
|
remotes :: [Repo],
|
|
-- remoteName holds the name used for this repo in remotes
|
|
remoteName :: Maybe String
|
|
} deriving (Show, Eq)
|
|
|
|
newFrom :: RepoLocation -> Repo
|
|
newFrom l =
|
|
Repo {
|
|
location = l,
|
|
config = Map.empty,
|
|
remotes = [],
|
|
remoteName = Nothing
|
|
}
|
|
|
|
{- Local Repo constructor, requires an absolute path to the repo be
|
|
- specified. -}
|
|
repoFromAbsPath :: FilePath -> IO Repo
|
|
repoFromAbsPath dir
|
|
| "/" `isPrefixOf` dir = do
|
|
-- Git always looks for "dir.git" in preference to
|
|
-- to "dir", even if dir ends in a "/".
|
|
let canondir = dropTrailingPathSeparator dir
|
|
let dir' = canondir ++ ".git"
|
|
e <- doesDirectoryExist dir'
|
|
if e
|
|
then ret dir'
|
|
else if "/.git" `isSuffixOf` canondir
|
|
then do
|
|
-- When dir == "foo/.git", git looks
|
|
-- for "foo/.git/.git", and failing
|
|
-- that, uses "foo" as the repository.
|
|
e' <- doesDirectoryExist $ dir </> ".git"
|
|
if e'
|
|
then ret dir
|
|
else ret $ takeDirectory canondir
|
|
else ret dir
|
|
| otherwise = error $ "internal error, " ++ dir ++ " is not absolute"
|
|
where
|
|
ret = return . newFrom . Dir
|
|
|
|
{- Remote Repo constructor. Throws exception on invalid url. -}
|
|
repoFromUrl :: String -> IO Repo
|
|
repoFromUrl url
|
|
| startswith "file://" url = repoFromAbsPath $ uriPath u
|
|
| otherwise = return $ newFrom $ Url u
|
|
where
|
|
u = maybe bad id $ parseURI url
|
|
bad = error $ "bad url " ++ url
|
|
|
|
{- Creates a repo that has an unknown location. -}
|
|
repoFromUnknown :: Repo
|
|
repoFromUnknown = newFrom Unknown
|
|
|
|
{- Converts a Local Repo into a remote repo, using the reference repo
|
|
- which is assumed to be on the same host. -}
|
|
localToUrl :: Repo -> Repo -> Repo
|
|
localToUrl reference r
|
|
| not $ repoIsUrl reference = error "internal error; reference repo not url"
|
|
| repoIsUrl r = r
|
|
| otherwise = r { location = Url $ fromJust $ parseURI absurl }
|
|
where
|
|
absurl =
|
|
urlScheme reference ++ "//" ++
|
|
urlAuthority reference ++
|
|
workTree r
|
|
|
|
{- User-visible description of a git repo. -}
|
|
repoDescribe :: Repo -> String
|
|
repoDescribe Repo { remoteName = Just name } = name
|
|
repoDescribe Repo { location = Url url } = show url
|
|
repoDescribe Repo { location = Dir dir } = dir
|
|
repoDescribe Repo { location = Unknown } = "UNKNOWN"
|
|
|
|
{- Location of the repo, either as a path or url. -}
|
|
repoLocation :: Repo -> String
|
|
repoLocation Repo { location = Url url } = show url
|
|
repoLocation Repo { location = Dir dir } = dir
|
|
repoLocation Repo { location = Unknown } = undefined
|
|
|
|
{- Constructs and returns an updated version of a repo with
|
|
- different remotes list. -}
|
|
remotesAdd :: Repo -> [Repo] -> Repo
|
|
remotesAdd repo rs = repo { remotes = rs }
|
|
|
|
{- Returns the name of the remote that corresponds to the repo, if
|
|
- it is a remote. -}
|
|
repoRemoteName :: Repo -> Maybe String
|
|
repoRemoteName Repo { remoteName = Just name } = Just name
|
|
repoRemoteName _ = Nothing
|
|
|
|
{- Sets the name of a remote based on the git config key, such as
|
|
"remote.foo.url". -}
|
|
repoRemoteNameSet :: Repo -> String -> Repo
|
|
repoRemoteNameSet r k = r { remoteName = Just basename }
|
|
where
|
|
basename = join "." $ reverse $ drop 1 $
|
|
reverse $ drop 1 $ split "." k
|
|
|
|
{- Some code needs to vary between URL and normal repos,
|
|
- or bare and non-bare, these functions help with that. -}
|
|
repoIsUrl :: Repo -> Bool
|
|
repoIsUrl Repo { location = Url _ } = True
|
|
repoIsUrl _ = False
|
|
|
|
repoIsSsh :: Repo -> Bool
|
|
repoIsSsh Repo { location = Url url }
|
|
| uriScheme url == "ssh:" = True
|
|
-- git treats these the same as ssh
|
|
| uriScheme url == "git+ssh:" = True
|
|
| uriScheme url == "ssh+git:" = True
|
|
| otherwise = False
|
|
repoIsSsh _ = False
|
|
|
|
configAvail ::Repo -> Bool
|
|
configAvail Repo { config = c } = c /= Map.empty
|
|
|
|
repoIsLocalBare :: Repo -> Bool
|
|
repoIsLocalBare r@(Repo { location = Dir _ }) = configAvail r && configBare r
|
|
repoIsLocalBare _ = False
|
|
|
|
assertLocal :: Repo -> a -> a
|
|
assertLocal repo action =
|
|
if not $ repoIsUrl repo
|
|
then action
|
|
else error $ "acting on URL git repo " ++ repoDescribe repo ++
|
|
" not supported"
|
|
assertUrl :: Repo -> a -> a
|
|
assertUrl repo action =
|
|
if repoIsUrl repo
|
|
then action
|
|
else error $ "acting on local git repo " ++ repoDescribe repo ++
|
|
" not supported"
|
|
|
|
configBare :: Repo -> Bool
|
|
configBare repo = maybe unknown configTrue $ Map.lookup "core.bare" $ config repo
|
|
where
|
|
unknown = error $ "it is not known if git repo " ++
|
|
repoDescribe repo ++
|
|
" is a bare repository; config not read"
|
|
|
|
{- Path to a repository's gitattributes file. -}
|
|
attributes :: Repo -> String
|
|
attributes repo
|
|
| configBare repo = workTree repo ++ "/info/.gitattributes"
|
|
| otherwise = workTree repo ++ "/.gitattributes"
|
|
|
|
{- Path to a repository's .git directory, relative to its workTree. -}
|
|
gitDir :: Repo -> String
|
|
gitDir repo
|
|
| configBare repo = ""
|
|
| otherwise = ".git"
|
|
|
|
{- Path to a repository's --work-tree, that is, its top.
|
|
-
|
|
- Note that for URL repositories, this is the path on the remote host. -}
|
|
workTree :: Repo -> FilePath
|
|
workTree r@(Repo { location = Url _ }) = urlPath r
|
|
workTree (Repo { location = Dir d }) = d
|
|
workTree Repo { location = Unknown } = undefined
|
|
|
|
{- Given a relative or absolute filename inside a git repository's
|
|
- workTree, calculates the name to use to refer to that file to git.
|
|
-
|
|
- This is complicated because the best choice can vary depending on
|
|
- whether the cwd is in a subdirectory of the git repository, or not.
|
|
-
|
|
- For example, when adding a file "/tmp/repo/foo", it's best to refer
|
|
- to it as "foo" if the cwd is outside the repository entirely
|
|
- (this avoids a gotcha with using the full path name when /tmp/repo
|
|
- is itself a symlink). But, if the cwd is "/tmp/repo/subdir",
|
|
- it's best to refer to "../foo".
|
|
-}
|
|
workTreeFile :: Repo -> FilePath -> IO FilePath
|
|
workTreeFile repo@(Repo { location = Dir d }) file = do
|
|
cwd <- getCurrentDirectory
|
|
let file' = absfile cwd
|
|
unless (inrepo file') $
|
|
error $ file ++ " is not located inside git repository " ++ absrepo
|
|
if (inrepo $ addTrailingPathSeparator cwd)
|
|
then return $ relPathDirToFile cwd file'
|
|
else return $ drop (length absrepo) file'
|
|
where
|
|
-- normalize both repo and file, so that repo
|
|
-- will be substring of file
|
|
absrepo = maybe bad addTrailingPathSeparator $ absNormPath "/" d
|
|
absfile c = maybe file id $ secureAbsNormPath c file
|
|
inrepo f = absrepo `isPrefixOf` f
|
|
bad = error $ "bad repo" ++ repoDescribe repo
|
|
workTreeFile repo _ = assertLocal repo $ error "internal"
|
|
|
|
{- Path of an URL repo. -}
|
|
urlPath :: Repo -> String
|
|
urlPath Repo { location = Url u } = uriPath u
|
|
urlPath repo = assertUrl repo $ error "internal"
|
|
|
|
{- Scheme of an URL repo. -}
|
|
urlScheme :: Repo -> String
|
|
urlScheme Repo { location = Url u } = uriScheme u
|
|
urlScheme repo = assertUrl repo $ error "internal"
|
|
|
|
{- 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. -}
|
|
urlHost :: Repo -> String
|
|
urlHost = urlAuthPart uriRegName'
|
|
|
|
{- Port of an URL repo, if it has a nonstandard one. -}
|
|
urlPort :: Repo -> Maybe Integer
|
|
urlPort r =
|
|
case urlAuthPart uriPort r of
|
|
":" -> Nothing
|
|
(':':p) -> Just (read p)
|
|
_ -> Nothing
|
|
|
|
{- Hostname of an URL repo, including any username (ie, "user@host") -}
|
|
urlHostUser :: Repo -> String
|
|
urlHostUser r = urlAuthPart uriUserInfo r ++ urlAuthPart uriRegName' r
|
|
|
|
{- The full authority portion an URL repo. (ie, "user@host:port") -}
|
|
urlAuthority :: Repo -> String
|
|
urlAuthority Repo { location = Url u } = uriUserInfo a ++ uriRegName' a ++ uriPort a
|
|
where
|
|
a = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u)
|
|
urlAuthority repo = assertUrl repo $ error "internal"
|
|
|
|
{- Applies a function to extract part of the uriAuthority of an URL repo. -}
|
|
urlAuthPart :: (URIAuth -> a) -> Repo -> a
|
|
urlAuthPart a Repo { location = Url u } = a auth
|
|
where
|
|
auth = fromMaybe (error $ "bad url " ++ show u) (uriAuthority u)
|
|
urlAuthPart _ repo = assertUrl repo $ error "internal"
|
|
|
|
{- Constructs a git command line operating on the specified repo. -}
|
|
gitCommandLine :: Repo -> [CommandParam] -> [CommandParam]
|
|
gitCommandLine repo@(Repo { location = Dir d} ) params =
|
|
-- force use of specified repo via --git-dir and --work-tree
|
|
[ Param ("--git-dir=" ++ d ++ "/" ++ gitDir repo)
|
|
, Param ("--work-tree=" ++ d)
|
|
] ++ params
|
|
gitCommandLine repo _ = assertLocal repo $ error "internal"
|
|
|
|
{- Runs git in the specified repo, throwing an error if it fails. -}
|
|
run :: Repo -> String -> [CommandParam] -> IO ()
|
|
run repo subcommand params = assertLocal repo $
|
|
boolSystem "git" (gitCommandLine repo ((Param subcommand):params))
|
|
>>! error $ "git " ++ show params ++ " failed"
|
|
|
|
{- Runs a git subcommand and returns it output, lazily.
|
|
-
|
|
- Note that this leaves the git process running, and so zombies will
|
|
- result unless reap is called.
|
|
-}
|
|
pipeRead :: Repo -> [CommandParam] -> IO String
|
|
pipeRead repo params = assertLocal repo $ do
|
|
(_, s) <- pipeFrom "git" $ toCommand $ gitCommandLine repo params
|
|
return s
|
|
|
|
{- Reaps any zombie git processes. -}
|
|
reap :: IO ()
|
|
reap = do
|
|
-- throws an exception when there are no child processes
|
|
r <- catch (getAnyProcessStatus False True) (\_ -> return Nothing)
|
|
maybe (return ()) (const reap) r
|
|
|
|
{- Scans for files that are checked into git at the specified locations. -}
|
|
inRepo :: Repo -> [FilePath] -> IO [FilePath]
|
|
inRepo repo l = pipeNullSplit repo $
|
|
[Params "ls-files --cached --exclude-standard -z --"] ++ map File l
|
|
|
|
{- Scans for files at the specified locations that are not checked into git,
|
|
- and not gitignored. -}
|
|
notInRepo :: Repo -> [FilePath] -> IO [FilePath]
|
|
notInRepo repo l = pipeNullSplit repo $
|
|
[Params "ls-files --others --exclude-standard -z --"] ++ map File l
|
|
|
|
{- Returns a list of all files that are staged for commit. -}
|
|
stagedFiles :: Repo -> [FilePath] -> IO [FilePath]
|
|
stagedFiles repo l = stagedFiles' repo l []
|
|
|
|
{- Returns a list of the files, staged for commit, that are being added,
|
|
- moved, or changed (but not deleted), from the specified locations. -}
|
|
stagedFilesNotDeleted :: Repo -> [FilePath] -> IO [FilePath]
|
|
stagedFilesNotDeleted repo l = stagedFiles' repo l [Param "--diff-filter=ACMRT"]
|
|
|
|
stagedFiles' :: Repo -> [FilePath] -> [CommandParam] -> IO [FilePath]
|
|
stagedFiles' repo l middle = pipeNullSplit repo $ start ++ middle ++ end
|
|
where
|
|
start = [Params "diff --cached --name-only -z"]
|
|
end = [Param "--"] ++ map File l
|
|
|
|
{- Returns a list of files that have unstaged changes. -}
|
|
changedUnstagedFiles :: Repo -> [FilePath] -> IO [FilePath]
|
|
changedUnstagedFiles repo l = pipeNullSplit repo $
|
|
[Params "diff --name-only -z --"] ++ map File l
|
|
|
|
{- Returns a list of the files in the specified locations that are staged
|
|
- for commit, and whose type has changed. -}
|
|
typeChangedStagedFiles :: Repo -> [FilePath] -> IO [FilePath]
|
|
typeChangedStagedFiles repo l = typeChangedFiles' repo l [Param "--cached"]
|
|
|
|
{- Returns a list of the files in the specified locations whose type has
|
|
- changed. Files only staged for commit will not be included. -}
|
|
typeChangedFiles :: Repo -> [FilePath] -> IO [FilePath]
|
|
typeChangedFiles repo l = typeChangedFiles' repo l []
|
|
|
|
typeChangedFiles' :: Repo -> [FilePath] -> [CommandParam] -> IO [FilePath]
|
|
typeChangedFiles' repo l middle = pipeNullSplit repo $ start ++ middle ++ end
|
|
where
|
|
start = [Params "diff --name-only --diff-filter=T -z"]
|
|
end = [Param "--"] ++ map File l
|
|
|
|
{- Reads null terminated output of a git command (as enabled by the -z
|
|
- parameter), and splits it into a list of files. -}
|
|
pipeNullSplit :: Repo -> [CommandParam] -> IO [FilePath]
|
|
pipeNullSplit repo params = do
|
|
fs0 <- pipeRead repo params
|
|
return $ split0 fs0
|
|
where
|
|
split0 s = filter (not . null) $ split "\0" s
|
|
|
|
{- Runs git config and populates a repo with its config. -}
|
|
configRead :: Repo -> IO Repo
|
|
configRead repo@(Repo { location = Dir d }) = do
|
|
{- Cannot use pipeRead because it relies on the config having
|
|
been already read. Instead, chdir to the repo. -}
|
|
cwd <- getCurrentDirectory
|
|
bracket_ (changeWorkingDirectory d)
|
|
(\_ -> changeWorkingDirectory cwd) $
|
|
pOpen ReadFromPipe "git" ["config", "--list"] $
|
|
hConfigRead repo
|
|
configRead r = assertLocal r $ error "internal"
|
|
|
|
{- Reads git config from a handle and populates a repo with it. -}
|
|
hConfigRead :: Repo -> Handle -> IO Repo
|
|
hConfigRead repo h = do
|
|
val <- hGetContentsStrict h
|
|
configStore repo val
|
|
|
|
{- Parses a git config and returns a version of the repo using it. -}
|
|
configStore :: Repo -> String -> IO Repo
|
|
configStore repo s = do
|
|
rs <- configRemotes r
|
|
return $ r { remotes = rs }
|
|
where
|
|
r = repo { config = configParse s }
|
|
|
|
{- Calculates a list of a repo's configured remotes, by parsing its config. -}
|
|
configRemotes :: Repo -> IO [Repo]
|
|
configRemotes repo = mapM construct remotepairs
|
|
where
|
|
remotepairs = Map.toList $ filterremotes $ config repo
|
|
filterremotes = Map.filterWithKey (\k _ -> isremote k)
|
|
isremote k = startswith "remote." k && endswith ".url" k
|
|
construct (k,v) = do
|
|
r <- gen v
|
|
return $ repoRemoteNameSet r k
|
|
gen v | scpstyle v = repoFromUrl $ scptourl v
|
|
| isURI v = repoFromUrl v
|
|
| otherwise = repoFromRemotePath v repo
|
|
-- git remotes can be written scp style -- [user@]host:dir
|
|
scpstyle v = ":" `isInfixOf` v && (not $ "//" `isInfixOf` v)
|
|
scptourl v = "ssh://" ++ host ++ slash dir
|
|
where
|
|
bits = split ":" v
|
|
host = bits !! 0
|
|
dir = join ":" $ drop 1 bits
|
|
slash d | d == "" = "/~/" ++ dir
|
|
| d !! 0 == '/' = dir
|
|
| d !! 0 == '~' = '/':dir
|
|
| otherwise = "/~/" ++ dir
|
|
|
|
{- Checks if a string from git config is a true value. -}
|
|
configTrue :: String -> Bool
|
|
configTrue s = map toLower s == "true"
|
|
|
|
{- Parses git config --list output into a config map. -}
|
|
configParse :: String -> Map.Map String String
|
|
configParse s = Map.fromList $ map pair $ lines s
|
|
where
|
|
pair l = (key l, val l)
|
|
key l = head $ keyval l
|
|
val l = join sep $ drop 1 $ keyval l
|
|
keyval l = split sep l :: [String]
|
|
sep = "="
|
|
|
|
{- Returns a single git config setting, or a default value if not set. -}
|
|
configGet :: Repo -> String -> String -> String
|
|
configGet repo key defaultValue =
|
|
Map.findWithDefault defaultValue key (config repo)
|
|
|
|
{- Access to raw config Map -}
|
|
configMap :: Repo -> Map.Map String String
|
|
configMap repo = config repo
|
|
|
|
{- Efficiently looks up a gitattributes value for each file in a list. -}
|
|
checkAttr :: Repo -> String -> [FilePath] -> IO [(FilePath, String)]
|
|
checkAttr repo attr files = do
|
|
-- git check-attr wants files that are absolute (or relative to the
|
|
-- top of the repo). But we're passed files relative to the current
|
|
-- directory. Convert to absolute, and then convert the filenames
|
|
-- in its output back to relative.
|
|
cwd <- getCurrentDirectory
|
|
let absfiles = map (absPathFrom cwd) files
|
|
(_, fromh, toh) <- hPipeBoth "git" (toCommand params)
|
|
_ <- forkProcess $ do
|
|
hClose fromh
|
|
hPutStr toh $ join "\0" absfiles
|
|
hClose toh
|
|
exitSuccess
|
|
hClose toh
|
|
s <- hGetContents fromh
|
|
return $ map (topair $ cwd++"/") $ lines s
|
|
where
|
|
params = gitCommandLine repo [Param "check-attr", Param attr, Params "-z --stdin"]
|
|
topair cwd l = (relfile, value)
|
|
where
|
|
relfile
|
|
| startswith cwd file = drop (length cwd) file
|
|
| otherwise = file
|
|
file = decodeGitFile $ join sep $ take end bits
|
|
value = bits !! end
|
|
end = length bits - 1
|
|
bits = split sep l
|
|
sep = ": " ++ attr ++ ": "
|
|
|
|
{- Some git commands output encoded filenames. Decode that (annoyingly
|
|
- complex) encoding. -}
|
|
decodeGitFile :: String -> FilePath
|
|
decodeGitFile [] = []
|
|
decodeGitFile f@(c:s)
|
|
-- encoded strings will be inside double quotes
|
|
| c == '"' = unescape ("", middle)
|
|
| otherwise = f
|
|
where
|
|
e = '\\'
|
|
middle = take (length s - 1) s
|
|
unescape (b, []) = b
|
|
-- look for escapes starting with '\'
|
|
unescape (b, v) = b ++ beginning ++ unescape (decode rest)
|
|
where
|
|
pair = span (/= e) v
|
|
beginning = fst pair
|
|
rest = snd pair
|
|
isescape x = x == e
|
|
-- \NNN is an octal encoded character
|
|
decode (x:n1:n2:n3:rest)
|
|
| isescape x && alloctal = (fromoctal, rest)
|
|
where
|
|
alloctal = isOctDigit n1 &&
|
|
isOctDigit n2 &&
|
|
isOctDigit n3
|
|
fromoctal = [chr $ readoctal [n1, n2, n3]]
|
|
readoctal o = read $ "0o" ++ o :: Int
|
|
-- \C is used for a few special characters
|
|
decode (x:nc:rest)
|
|
| isescape x = ([echar nc], rest)
|
|
where
|
|
echar 'a' = '\a'
|
|
echar 'b' = '\b'
|
|
echar 'f' = '\f'
|
|
echar 'n' = '\n'
|
|
echar 'r' = '\r'
|
|
echar 't' = '\t'
|
|
echar 'v' = '\v'
|
|
echar a = a
|
|
decode n = ("", n)
|
|
|
|
{- Should not need to use this, except for testing decodeGitFile. -}
|
|
encodeGitFile :: FilePath -> String
|
|
encodeGitFile s = foldl (++) "\"" (map echar s) ++ "\""
|
|
where
|
|
e c = '\\' : [c]
|
|
echar '\a' = e 'a'
|
|
echar '\b' = e 'b'
|
|
echar '\f' = e 'f'
|
|
echar '\n' = e 'n'
|
|
echar '\r' = e 'r'
|
|
echar '\t' = e 't'
|
|
echar '\v' = e 'v'
|
|
echar '\\' = e '\\'
|
|
echar '"' = e '"'
|
|
echar x
|
|
| ord x < 0x20 = e_num x -- low ascii
|
|
| ord x >= 256 = e_utf x
|
|
| ord x > 0x7E = e_num x -- high ascii
|
|
| otherwise = [x] -- printable ascii
|
|
where
|
|
showoctal i = '\\' : printf "%03o" i
|
|
e_num c = showoctal $ ord c
|
|
-- unicode character is decomposed to
|
|
-- Word8s and each is shown in octal
|
|
e_utf c = showoctal =<< (encode [c] :: [Word8])
|
|
|
|
{- for quickcheck -}
|
|
prop_idempotent_deencode :: String -> Bool
|
|
prop_idempotent_deencode s = s == decodeGitFile (encodeGitFile s)
|
|
|
|
{- Constructs a Repo from the path specified in the git remotes of
|
|
- another Repo. -}
|
|
repoFromRemotePath :: FilePath -> Repo -> IO Repo
|
|
repoFromRemotePath dir repo = do
|
|
dir' <- expandTilde dir
|
|
repoFromAbsPath $ workTree repo </> dir'
|
|
|
|
{- Git remotes can have a directory that is specified relative
|
|
- to the user's home directory, or that contains tilde expansions.
|
|
- This converts such a directory to an absolute path.
|
|
- Note that it has to run on the system where the remote is.
|
|
-}
|
|
repoAbsPath :: FilePath -> IO FilePath
|
|
repoAbsPath d = do
|
|
d' <- expandTilde d
|
|
h <- myHomeDir
|
|
return $ h </> d'
|
|
|
|
expandTilde :: FilePath -> IO FilePath
|
|
expandTilde = expandt True
|
|
where
|
|
expandt _ [] = return ""
|
|
expandt _ ('/':cs) = do
|
|
v <- expandt True cs
|
|
return ('/':v)
|
|
expandt True ('~':'/':cs) = do
|
|
h <- myHomeDir
|
|
return $ h </> cs
|
|
expandt True ('~':cs) = do
|
|
let (name, rest) = findname "" cs
|
|
u <- getUserEntryForName name
|
|
return $ homeDirectory u </> rest
|
|
expandt _ (c:cs) = do
|
|
v <- expandt False cs
|
|
return (c:v)
|
|
findname n [] = (n, "")
|
|
findname n (c:cs)
|
|
| c == '/' = (n, cs)
|
|
| otherwise = findname (n++[c]) cs
|
|
|
|
{- Finds the current git repository, which may be in a parent directory. -}
|
|
repoFromCwd :: IO Repo
|
|
repoFromCwd = getCurrentDirectory >>= seekUp isRepoTop >>= maybe norepo makerepo
|
|
where
|
|
makerepo = return . newFrom . Dir
|
|
norepo = error "Not in a git repository."
|
|
|
|
seekUp :: (FilePath -> IO Bool) -> FilePath -> IO (Maybe FilePath)
|
|
seekUp want dir = do
|
|
ok <- want dir
|
|
if ok
|
|
then return (Just dir)
|
|
else case (parentDir dir) of
|
|
"" -> return Nothing
|
|
d -> seekUp want d
|
|
|
|
isRepoTop :: FilePath -> IO Bool
|
|
isRepoTop dir = do
|
|
r <- isRepo
|
|
b <- isBareRepo
|
|
return (r || b)
|
|
where
|
|
isRepo = gitSignature ".git" ".git/config"
|
|
isBareRepo = gitSignature "objects" "config"
|
|
gitSignature subdir file = do
|
|
s <- (doesDirectoryExist (dir ++ "/" ++ subdir))
|
|
f <- (doesFileExist (dir ++ "/" ++ file))
|
|
return (s && f)
|