2d224e0d28
At this point the test suite builds, and mostly the assistant is left. Sponsored-by: unqueued
84 lines
2.4 KiB
Haskell
84 lines
2.4 KiB
Haskell
{- absolute and relative path manipulation
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-
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- Copyright 2010-2021 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.Path.AbsRel (
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absPathFrom,
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absPath,
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relPathCwdToFile,
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relPathDirToFile,
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relPathDirToFileAbs,
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relHome,
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) where
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import qualified Data.ByteString as B
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import Control.Applicative
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import Prelude
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import Utility.Path
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import Utility.UserInfo
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import Utility.OsPath
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import Utility.SystemDirectory
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{- Makes a path absolute.
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-
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- Also simplifies it using simplifyPath.
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-
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- The first parameter is a base directory (ie, the cwd) to use if the path
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- is not already absolute, and should itself be absolute.
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-
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- Does not attempt to deal with edge cases or ensure security with
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- untrusted inputs.
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-}
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absPathFrom :: OsPath -> OsPath -> OsPath
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absPathFrom dir path = simplifyPath (combine dir path)
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{- Converts a filename into an absolute path.
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-
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- Also simplifies it using simplifyPath.
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-
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- Unlike Directory.canonicalizePath, this does not require the path
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- already exists. -}
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absPath :: OsPath -> IO OsPath
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absPath file
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-- Avoid unnecessarily getting the current directory when the path
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-- is already absolute. absPathFrom uses simplifyPath
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-- so also used here for consistency.
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| isAbsolute file = return $ simplifyPath file
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| otherwise = do
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cwd <- getCurrentDirectory
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return $ absPathFrom cwd file
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{- Constructs the minimal relative path from the CWD to a file.
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-
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- For example, assuming CWD is /tmp/foo/bar:
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- relPathCwdToFile "/tmp/foo" == ".."
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- relPathCwdToFile "/tmp/foo/bar" == ""
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- relPathCwdToFile "../bar/baz" == "baz"
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-}
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relPathCwdToFile :: OsPath -> IO OsPath
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relPathCwdToFile f
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-- Optimisation: Avoid doing any IO when the path is relative
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-- and does not contain any ".." component.
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| isRelative f && not (".." `B.isInfixOf` fromOsPath f) = return f
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| otherwise = do
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c <- getCurrentDirectory
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relPathDirToFile c f
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{- Constructs a minimal relative path from a directory to a file. -}
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relPathDirToFile :: OsPath -> OsPath -> IO OsPath
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relPathDirToFile from to = relPathDirToFileAbs <$> absPath from <*> absPath to
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{- Converts paths in the home directory to use ~/ -}
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relHome :: OsPath -> IO OsPath
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relHome path = do
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home <- toOsPath <$> myHomeDir
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return $ if dirContains home path
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then literalOsPath "~/" <> relPathDirToFileAbs home path
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else path
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