64 lines
1.9 KiB
Haskell
64 lines
1.9 KiB
Haskell
{- git check-attr interface
|
|
-
|
|
- Copyright 2010-2012 Joey Hess <joey@kitenet.net>
|
|
-
|
|
- Licensed under the GNU GPL version 3 or higher.
|
|
-}
|
|
|
|
module Git.CheckAttr where
|
|
|
|
import Common
|
|
import Git
|
|
import Git.Command
|
|
import qualified Git.BuildVersion
|
|
import qualified Utility.CoProcess as CoProcess
|
|
|
|
type CheckAttrHandle = (CoProcess.CoProcessHandle, [Attr], String)
|
|
|
|
type Attr = String
|
|
|
|
{- Starts git check-attr running to look up the specified gitattributes
|
|
- values and returns a handle. -}
|
|
checkAttrStart :: [Attr] -> Repo -> IO CheckAttrHandle
|
|
checkAttrStart attrs repo = do
|
|
cwd <- getCurrentDirectory
|
|
h <- CoProcess.rawMode =<< gitCoProcessStart True params repo
|
|
return (h, attrs, cwd)
|
|
where
|
|
params =
|
|
[ Param "check-attr"
|
|
, Params "-z --stdin"
|
|
] ++ map Param attrs ++
|
|
[ Param "--" ]
|
|
|
|
checkAttrStop :: CheckAttrHandle -> IO ()
|
|
checkAttrStop (h, _, _) = CoProcess.stop h
|
|
|
|
{- Gets an attribute of a file. -}
|
|
checkAttr :: CheckAttrHandle -> Attr -> FilePath -> IO String
|
|
checkAttr (h, attrs, cwd) want file = do
|
|
pairs <- CoProcess.query h send receive
|
|
let vals = map snd $ filter (\(attr, _) -> attr == want) pairs
|
|
case vals of
|
|
[v] -> return v
|
|
_ -> error $ "unable to determine " ++ want ++ " attribute of " ++ file
|
|
where
|
|
send to = hPutStr to $ file' ++ "\0"
|
|
receive from = forM attrs $ \attr -> do
|
|
l <- hGetLine from
|
|
return (attr, attrvalue attr l)
|
|
{- Before git 1.7.7, git check-attr worked best with
|
|
- absolute filenames; using them worked around some bugs
|
|
- with relative filenames.
|
|
-
|
|
- With newer git, git check-attr chokes on some absolute
|
|
- filenames, and the bugs that necessitated them were fixed,
|
|
- so use relative filenames. -}
|
|
oldgit = Git.BuildVersion.older "1.7.7"
|
|
file'
|
|
| oldgit = absPathFrom cwd file
|
|
| otherwise = relPathDirToFile cwd $ absPathFrom cwd file
|
|
attrvalue attr l = end bits !! 0
|
|
where
|
|
bits = split sep l
|
|
sep = ": " ++ attr ++ ": "
|