93 lines
2.8 KiB
Haskell
93 lines
2.8 KiB
Haskell
{- git check-attr interface
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-
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- Copyright 2010-2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Git.CheckAttr where
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import Common
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import Git
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import Git.Command
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import qualified Git.BuildVersion
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import qualified Utility.CoProcess as CoProcess
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import System.IO.Error
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type CheckAttrHandle = (CoProcess.CoProcessHandle, [Attr], String)
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type Attr = String
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{- Starts git check-attr running to look up the specified gitattributes
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- values and returns a handle. -}
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checkAttrStart :: [Attr] -> Repo -> IO CheckAttrHandle
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checkAttrStart attrs repo = do
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currdir <- getCurrentDirectory
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h <- CoProcess.rawMode =<< gitCoProcessStart True params repo
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return (h, attrs, currdir)
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where
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params =
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[ Param "check-attr"
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, Params "-z --stdin"
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] ++ map Param attrs ++
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[ Param "--" ]
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checkAttrStop :: CheckAttrHandle -> IO ()
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checkAttrStop (h, _, _) = CoProcess.stop h
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{- Gets an attribute of a file. -}
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checkAttr :: CheckAttrHandle -> Attr -> FilePath -> IO String
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checkAttr (h, attrs, currdir) want file = do
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pairs <- CoProcess.query h send (receive "")
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let vals = map snd $ filter (\(attr, _) -> attr == want) pairs
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case vals of
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[v] -> return v
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_ -> error $ "unable to determine " ++ want ++ " attribute of " ++ file
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where
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send to = hPutStr to $ file' ++ "\0"
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receive c from = do
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s <- hGetSomeString from 1024
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if null s
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then eofError
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else do
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let v = c ++ s
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maybe (receive v from) return (parse v)
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eofError = ioError $ mkIOError userErrorType "git check-attr EOF" Nothing Nothing
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parse s
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-- new null separated output
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| '\0' `elem` s = if "\0" `isSuffixOf` s
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then
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let bits = segment (== '\0') s
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in if length bits == (numattrs * 3) + 1
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then Just $ getattrvalues bits []
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else Nothing -- more attributes to come
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else Nothing -- output incomplete
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-- old one line per value output
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| otherwise = if "\n" `isSuffixOf` s
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then
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let ls = lines s
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in if length ls == numattrs
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then Just $ map (\(attr, val) -> (attr, oldattrvalue attr val))
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(zip attrs ls)
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else Nothing -- more attributes to come
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else Nothing -- line incomplete
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numattrs = length attrs
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{- Before git 1.7.7, git check-attr worked best with
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- absolute filenames; using them worked around some bugs
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- with relative filenames.
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-
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- With newer git, git check-attr chokes on some absolute
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- filenames, and the bugs that necessitated them were fixed,
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- so use relative filenames. -}
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oldgit = Git.BuildVersion.older "1.7.7"
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file'
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| oldgit = absPathFrom currdir file
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| otherwise = relPathDirToFile currdir $ absPathFrom currdir file
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oldattrvalue attr l = end bits !! 0
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where
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bits = split sep l
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sep = ": " ++ attr ++ ": "
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getattrvalues (_filename:attr:val:rest) c = getattrvalues rest ((attr,val):c)
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getattrvalues _ c = c
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