getWorkingDirectory/changeWorkingDirectory

[Benjamin Franksen]

Module System.Posix.Directory of the unix package defines
 
  getWorkingDirectory :: IO FilePath
  changeWorkingDirectory :: FilePath -> IO ()

I believe the functionality is quite portable and not limited to unix-like 
systems. I know that e.g. Windows has chdir and getcwd. Module Filesystem of 
the system-fileio package has

  getWorkingDirectory :: IO FilePath
  setWorkingDirectory :: FilePath -> IO ()

I propose to add these functions to System.Environmant or maybe 
System.Directory.

Rationale:

(1) This is standard functionality that should at least be in the Haskell 
Platform, if not in the standard libraries.

(2) I would like to avoid depending on an extra package just to have these 
two very basic functions available in a OS independent way.

(3) "system-fileio".Filesystem does not seem to be the right place for this. 

The last point may be arguable, but the first two are plain common sense 
IMO.

Cheers
Ben
-- 
"Make it so they have to reboot after every typo." ? Scott Adams