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|
{- git diff-tree interface
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Git.DiffTree (
DiffTreeItem(..),
diffTree,
parseDiffTree
) where
import Numeric
import System.Posix.Types
import Common
import Git
import Git.Sha
import Git.Command
import qualified Git.Filename
data DiffTreeItem = DiffTreeItem
{ srcmode :: FileMode
, dstmode :: FileMode
, srcsha :: Sha -- nullSha if file was added
, dstsha :: Sha -- nullSha if file was deleted
, status :: String
, file :: FilePath
} deriving Show
{- Diffs two tree Refs. -}
diffTree :: Ref -> Ref -> Repo -> IO ([DiffTreeItem], IO Bool)
diffTree src dst repo = do
(diff, cleanup) <- pipeNullSplit [Params "diff-tree -z --raw --no-renames -l0", Param (show src), Param (show dst)] repo
return (parseDiffTree diff, cleanup)
{- Parses diff-tree output. -}
parseDiffTree :: [String] -> [DiffTreeItem]
parseDiffTree l = go l []
where
go [] c = c
go (info:f:rest) c = go rest (mk info f : c)
go (s:[]) _ = error $ "diff-tree parse error " ++ s
mk info f = DiffTreeItem
{ srcmode = readmode srcm
, dstmode = readmode dstm
, srcsha = fromMaybe (error "bad srcsha") $ extractSha ssha
, dstsha = fromMaybe (error "bad dstsha") $ extractSha dsha
, status = s
, file = Git.Filename.decode f
}
where
readmode = fst . Prelude.head . readOct
-- info = :<srcmode> SP <dstmode> SP <srcsha> SP <dstsha> SP <status>
-- All fields are fixed, so we can pull them out of
-- specific positions in the line.
(srcm, past_srcm) = splitAt 7 $ drop 1 info
(dstm, past_dstm) = splitAt 7 past_srcm
(ssha, past_ssha) = splitAt shaSize past_dstm
(dsha, past_dsha) = splitAt shaSize $ drop 1 past_ssha
s = drop 1 past_dsha
|
