e006acc8e3
prop_encode_decode_roundtrip failed on "\175" in C locale. This may be a new problem after the switch to RawFilePath, but it already had filtering for high chars, so changed to only test ascii chars.
55 lines
1.5 KiB
Haskell
55 lines
1.5 KiB
Haskell
{- Some git commands output encoded filenames, in a rather annoyingly complex
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- C-style encoding.
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-
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- Copyright 2010, 2011 Joey Hess <id@joeyh.name>
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-
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- Licensed under the GNU AGPL version 3 or higher.
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-}
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module Git.Filename where
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import Common
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import Utility.Format (decode_c, encode_c)
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import Data.Char
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import Data.Word
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import qualified Data.ByteString as S
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-- encoded filenames will be inside double quotes
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decode :: S.ByteString -> RawFilePath
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decode b = case S.uncons b of
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Nothing -> b
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Just (h, t)
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| h /= q -> b
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| otherwise -> case S.unsnoc t of
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Nothing -> b
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Just (i, l)
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| l /= q -> b
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| otherwise ->
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encodeBS $ decode_c $ decodeBS i
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where
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q :: Word8
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q = fromIntegral (ord '"')
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{- Should not need to use this, except for testing decode. -}
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encode :: RawFilePath -> S.ByteString
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encode s = encodeBS $ "\"" ++ encode_c (decodeBS s) ++ "\""
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prop_encode_decode_roundtrip :: FilePath -> Bool
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prop_encode_decode_roundtrip s = s' ==
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fromRawFilePath (decode (encode (toRawFilePath s')))
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where
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s' = nonul (nohigh s)
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-- Encoding and then decoding roundtrips only when
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-- the string does not contain high unicode, because eg,
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-- both "\12345" and "\227\128\185" are encoded to
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-- "\343\200\271".
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--
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-- This property papers over the problem, by only
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-- testing ascii
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nohigh = filter isAscii
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-- A String can contain a NUL, but toRawFilePath
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-- truncates on the NUL, which is generally fine
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-- because unix filenames cannot contain NUL.
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-- So the encoding only roundtrips when there is no nul.
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nonul = filter (/= '\NUL')
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