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|
{- git ls-tree interface
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Git.LsTree (
TreeItem(..),
lsTree
) where
import Numeric
import Control.Applicative
import Data.Char
import System.Posix.Types
import Git
import Utility.SafeCommand
type Treeish = String
data TreeItem = TreeItem
{ mode :: FileMode
, objtype :: String
, sha :: String
, file :: FilePath
} deriving Show
{- Lists the contents of a Treeish -}
lsTree :: Repo -> Treeish -> IO [TreeItem]
lsTree repo t = map parseLsTree <$>
pipeNullSplit repo [Params "ls-tree --full-tree -z -r --", File t]
{- Parses a line of ls-tree output.
- (The --long format is not currently supported.) -}
parseLsTree :: String -> TreeItem
parseLsTree l = TreeItem m o s f
where
-- l = <mode> SP <type> SP <sha> TAB <file>
-- Since everything until the file is fixed-width,
-- do not need to split on words.
(m, past_m) = head $ readOct l
(o, past_o) = splitAt 4 $ space past_m
(s, past_s) = splitAt shaSize $ space past_o
f = decodeGitFile $ space past_s
space (sp:rest)
| isSpace sp = rest
| otherwise = parseerr
space [] = parseerr
parseerr = "ls-tree parse error: " ++ l
|
