86 lines
2.4 KiB
Haskell
86 lines
2.4 KiB
Haskell
{- filenames (not paths) used in views
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-
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- Copyright 2014 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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{-# LANGUAGE CPP #-}
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module Annex.View.ViewedFile (
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ViewedFile,
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MkViewedFile,
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viewedFileFromReference,
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viewedFileReuse,
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dirFromViewedFile,
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prop_viewedFile_roundtrips,
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) where
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import Common.Annex
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type FileName = String
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type ViewedFile = FileName
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type MkViewedFile = FilePath -> ViewedFile
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{- Converts a filepath used in a reference branch to the
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- filename that will be used in the view.
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-
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- No two filepaths from the same branch should yeild the same result,
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- so all directory structure needs to be included in the output filename
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- in some way.
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-
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- So, from dir/subdir/file.foo, generate file_%dir%subdir%.foo
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-}
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viewedFileFromReference :: MkViewedFile
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viewedFileFromReference f = concat
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[ escape base
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, if null dirs then "" else "_%" ++ intercalate "%" (map escape dirs) ++ "%"
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, escape $ concat extensions
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]
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where
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(path, basefile) = splitFileName f
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dirs = filter (/= ".") $ map dropTrailingPathSeparator (splitPath path)
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(base, extensions) = splitShortExtensions basefile
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{- To avoid collisions with filenames or directories that contain
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- '%', and to allow the original directories to be extracted
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- from the ViewedFile, '%' is escaped. )
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-}
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escape :: String -> String
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escape = replace "%" (escchar:'%':[]) . replace [escchar] [escchar, escchar]
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escchar :: Char
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#ifndef mingw32_HOST_OS
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escchar = '\\'
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#else
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-- \ is path separator on Windows, so instead use !
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escchar = '!'
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#endif
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{- For use when operating already within a view, so whatever filepath
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- is present in the work tree is already a ViewedFile. -}
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viewedFileReuse :: MkViewedFile
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viewedFileReuse = takeFileName
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{- Extracts from a ViewedFile the directory where the file is located on
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- in the reference branch. -}
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dirFromViewedFile :: ViewedFile -> FilePath
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dirFromViewedFile = joinPath . drop 1 . sep [] ""
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where
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sep l _ [] = reverse l
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sep l curr (c:cs)
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| c == '%' = sep (reverse curr:l) "" cs
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| c == escchar = case cs of
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(c':cs') -> sep l (c':curr) cs'
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[] -> sep l curr cs
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| otherwise = sep l (c:curr) cs
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prop_viewedFile_roundtrips :: FilePath -> Bool
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prop_viewedFile_roundtrips f
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-- Relative filenames wanted, not directories.
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| any (isPathSeparator) (end f ++ beginning f) = True
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| isAbsolute f = True
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| otherwise = dir == dirFromViewedFile (viewedFileFromReference f)
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where
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dir = joinPath $ beginning $ splitDirectories f
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