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simplify and speed up Utility.FileSystemEncoding

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This eliminates the distinction between decodeBS and decodeBS', encodeBS
and encodeBS', etc. The old implementation truncated at NUL, and the
primed versions had to do extra work to avoid that problem. The new
implementation does not truncate at NUL, and is also a lot faster.
(Benchmarked at 2x faster for decodeBS and 3x for encodeBS; more for the
primed versions.)

Note that filepath-bytestring 1.4.2.1.8 contains the same optimisation,
and upgrading to it will speed up to/fromRawFilePath.

AFAIK, nothing relied on the old behavior of truncating at NUL. Some
code used the faster versions in places where I was sure there would not
be a NUL. So this change is unlikely to break anything.

Also, moved s2w8 and w82s out of the module, as they do not involve
filesystem encoding really.

Sponsored-by: Shae Erisson on Patreon
This commit is contained in:
Joey Hess 2021-08-10 20:45:02 -04:00
parent a38b724bfa
commit fa62c98910
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GPG key ID: DB12DB0FF05F8F38
55 changed files with 138 additions and 217 deletions
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4
Git/LsFiles.hs
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@ -251,7 +251,7 @@ data Unmerged = Unmerged
unmerged :: [RawFilePath] -> Repo -> IO ([Unmerged], IO Bool)
unmerged l repo = guardSafeForLsFiles repo $ do
(fs, cleanup) <- pipeNullSplit params repo
return (reduceUnmerged [] $ catMaybes $ map (parseUnmerged . decodeBL') fs, cleanup)
return (reduceUnmerged [] $ catMaybes $ map (parseUnmerged . decodeBL) fs, cleanup)
where
params =
Param "ls-files" :
@ -277,7 +277,7 @@ parseUnmerged s
then Nothing
else do
treeitemtype <- readTreeItemType (encodeBS rawtreeitemtype)
sha <- extractSha (encodeBS' rawsha)
sha <- extractSha (encodeBS rawsha)
return $ InternalUnmerged (stage == 2) (toRawFilePath file)
(Just treeitemtype) (Just sha)
_ -> Nothing