git-annex/Annex/View/ViewedFile.hs

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{- filenames (not paths) used in views
-
- Copyright 2014-2024 Joey Hess <id@joeyh.name>
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-
- Licensed under the GNU AGPL version 3 or higher.
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-}
{-# LANGUAGE CPP #-}
module Annex.View.ViewedFile (
ViewedFile,
MkViewedFile,
viewedFileFromReference,
viewedFileFromReference',
viewedFileReuse,
dirFromViewedFile,
prop_viewedFile_roundtrips,
) where
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import Annex.Common
import Utility.QuickCheck
import Backend.Utilities (maxExtensions)
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import qualified Data.ByteString as S
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type FileName = String
type ViewedFile = FileName
type MkViewedFile = FilePath -> ViewedFile
{- Converts a filepath used in a reference branch to the
- filename that will be used in the view.
-
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- No two filepaths from the same branch should yield the same result,
- so all directory structure needs to be included in the output filename
- in some way.
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-
- So, from dir/subdir/file.foo, generate file_%dir%subdir%.foo
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-}
viewedFileFromReference :: GitConfig -> MkViewedFile
viewedFileFromReference g = viewedFileFromReference'
(annexMaxExtensionLength g)
(annexMaxExtensions g)
viewedFileFromReference' :: Maybe Int -> Maybe Int -> MkViewedFile
viewedFileFromReference' maxextlen maxextensions f = concat $
[ escape (fromRawFilePath base')
, if null dirs then "" else "_%" ++ intercalate "%" (map escape dirs) ++ "%"
, escape $ fromRawFilePath $ S.concat extensions'
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]
where
(path, basefile) = splitFileName f
dirs = filter (/= ".") $ map dropTrailingPathSeparator (splitPath path)
(base, extensions) = case maxextlen of
Nothing -> splitShortExtensions (toRawFilePath basefile')
Just n -> splitShortExtensions' (n+1) (toRawFilePath basefile')
{- Limit number of extensions. -}
maxextensions' = fromMaybe maxExtensions maxextensions
(base', extensions')
| length extensions <= maxextensions' = (base, extensions)
| otherwise =
let (es,more) = splitAt maxextensions' (reverse extensions)
in (base <> mconcat (reverse more), reverse es)
{- On Windows, if the filename looked like "dir/c:foo" then
- basefile would look like it contains a drive letter, which will
- not work. There cannot really be a filename like that, probably,
- but it prevents the test suite failing. -}
(_basedrive, basefile') = splitDrive basefile
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{- To avoid collisions with filenames or directories that contain
- '%', and to allow the original directories to be extracted
- from the ViewedFile, '%' is escaped. )
-}
escape :: String -> String
escape = replace "%" (escchar:'%':[]) . replace [escchar] [escchar, escchar]
escchar :: Char
#ifndef mingw32_HOST_OS
escchar = '\\'
#else
-- \ is path separator on Windows, so instead use !
escchar = '!'
#endif
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{- For use when operating already within a view, so whatever filepath
- is present in the work tree is already a ViewedFile. -}
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viewedFileReuse :: MkViewedFile
viewedFileReuse = takeFileName
{- Extracts from a ViewedFile the directory where the file is located on
- in the reference branch. -}
dirFromViewedFile :: ViewedFile -> FilePath
dirFromViewedFile = joinPath . drop 1 . sep [] ""
where
sep l _ [] = reverse l
sep l curr (c:cs)
| c == '%' = sep (reverse curr:l) "" cs
| c == escchar = case cs of
(c':cs') -> sep l (c':curr) cs'
[] -> sep l curr cs
| otherwise = sep l (c:curr) cs
prop_viewedFile_roundtrips :: TestableFilePath -> Bool
prop_viewedFile_roundtrips tf
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-- Relative filenames wanted, not directories.
| any (isPathSeparator) (end f ++ beginning f) = True
| isAbsolute f || isDrive f = True
| otherwise = dir == dirFromViewedFile
(viewedFileFromReference' Nothing Nothing f)
where
f = fromTestableFilePath tf
dir = joinPath $ beginning $ splitDirectories f