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|
{- git check-attr interface
-
- Copyright 2010-2021 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU AGPL version 3 or higher.
-}
module Git.CheckAttr where
import Common
import Git
import Git.Command
import qualified Utility.CoProcess as CoProcess
import qualified Utility.RawFilePath as R
import System.IO.Error
import qualified Data.ByteString as B
type CheckAttrHandle = (CoProcess.CoProcessHandle, [Attr], RawFilePath)
type Attr = String
{- Starts git check-attr running to look up the specified attributes
- and returns a handle. -}
checkAttrStart :: [Attr] -> Repo -> IO CheckAttrHandle
checkAttrStart attrs repo = do
currdir <- R.getCurrentDirectory
h <- gitCoProcessStart True params repo
return (h, attrs, currdir)
where
params =
[ Param "check-attr"
, Param "-z"
, Param "--stdin"
] ++ map Param attrs ++
[ Param "--" ]
checkAttrStop :: CheckAttrHandle -> IO ()
checkAttrStop (h, _, _) = CoProcess.stop h
checkAttr :: CheckAttrHandle -> Attr -> RawFilePath -> IO String
checkAttr h want file = checkAttrs h [want] file >>= return . \case
(v:_) -> v
[] -> ""
{- Gets attributes of a file. When an attribute is not specified,
- returns "" for it. -}
checkAttrs :: CheckAttrHandle -> [Attr] -> RawFilePath -> IO [String]
checkAttrs (h, attrs, currdir) want file = do
l <- CoProcess.query h send (receive "")
return (getvals l want)
where
getvals _ [] = []
getvals l (x:xs) = case map snd $ filter (\(attr, _) -> attr == x) l of
["unspecified"] -> "" : getvals l xs
[v] -> v : getvals l xs
_ -> error $ "unable to determine " ++ x ++ " attribute of " ++ fromRawFilePath file
send to = B.hPutStr to $ file' `B.snoc` 0
receive c from = do
s <- hGetSomeString from 1024
if null s
then eofError
else do
let v = c ++ s
maybe (receive v from) return (parse v)
eofError = ioError $ mkIOError userErrorType "git check-attr EOF" Nothing Nothing
parse s
-- new null separated output
| '\0' `elem` s = if "\0" `isSuffixOf` s
then
let bits = segment (== '\0') s
in if length bits == (numattrs * 3) + 1
then Just $ getattrvalues bits []
else Nothing -- more attributes to come
else Nothing -- output incomplete
-- old one line per value output
| otherwise = if "\n" `isSuffixOf` s
then
let ls = lines s
in if length ls == numattrs
then Just $ map (\(attr, val) -> (attr, oldattrvalue attr val))
(zip attrs ls)
else Nothing -- more attributes to come
else Nothing -- line incomplete
numattrs = length attrs
{- git check-attr chokes on some absolute filenames,
- so make sure the filename is relative. -}
file' = relPathDirToFileAbs currdir $ absPathFrom currdir file
oldattrvalue attr l = end bits !! 0
where
bits = split sep l
sep = ": " ++ attr ++ ": "
getattrvalues (_filename:attr:val:rest) c = getattrvalues rest ((attr,val):c)
getattrvalues _ c = c
{- User may enter this to override a previous attr setting, when they wish
- to not specify an attr for some files. -}
unspecifiedAttr :: String
unspecifiedAttr = "!"
|
