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Add RealPath module #65

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Add RealPath module #65

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21 changes: 21 additions & 0 deletions src/Streamly/Coreutils/RealPath.hs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
-- |
-- Module : Streamly.Coreutils.RealPath
-- Copyright : (c) 2022 Composewell Technologies
-- License : BSD-3-Clause
-- Maintainer : [email protected]
-- Stability : experimental
-- Portability : GHC
--
-- Returns resolved symbolic link target.

module Streamly.Coreutils.RealPath
(realPath)
where

import System.Directory (canonicalizePath )

-- | Make a path absolute, normalize the path,
-- and remove as many indirections from it as possible.

realPath :: FilePath -> IO FilePath
realPath = canonicalizePath
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This is not the same. Did you test and compare the realpath coreutil and this?

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yes:
*Streamly.Coreutils.RealPath> realPath "./test2.txt"
"/home/ranjeetr/composewell/CoreUtils/streamly-coreutils/test2.txt"
*Streamly.Coreutils.RealPath> realPath "../test2.txt"
"/home/ranjeetr/composewell/CoreUtils/test2.txt"
*Streamly.Coreutils.RealPath>

kaveri:/composewell/CoreUtils/streamly-coreutils  (monadic-predicates)$ (nix) realpath ./test2.txt
/home/ranjeetr/composewell/CoreUtils/streamly-coreutils/test2.txt
kaveri:/composewell/CoreUtils/streamly-coreutils  (monadic-predicates)$ (nix) realpath ../test2.txt
/home/ranjeetr/composewell/CoreUtils/test2.txt
kaveri:~/composewell/CoreUtils/streamly-coreutils  (RealPath_module)$ (nix)

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same behaviors for symlink and nonexistent files.
*Streamly.Coreutils.RealPath> realPath "./ls.txt"
"/home/ranjeetr/composewell/CoreUtils/streamly-coreutils/test2.txt"
*Streamly.Coreutils.RealPath> realPath "../lsssss.txt"
"/home/ranjeetr/composewell/CoreUtils/lsssss.txt

1 change: 1 addition & 0 deletions streamly-coreutils.cabal
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Expand Up @@ -118,6 +118,7 @@ library
, Streamly.Coreutils.FileTest
, Streamly.Coreutils.Ls
, Streamly.Coreutils.String
, Streamly.Coreutils.RealPath
, Streamly.Coreutils.ShellWords
, Streamly.Coreutils.Sleep
, Streamly.Coreutils.Uniq
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