[Haskell-cafe] os.path.expanduser analogue

[Brandon Allbery]

On Sun, Nov 20, 2011 at 20:36, Ben Gamari <bgamari.foss at gmail.com> wrote:

> expandUser :: FilePath -> IO FilePath
> expandUser p = if "~/" `isPrefixOf` p
>                  then do u <- getLoginName
>                          return $ u ++ drop 2 p
>                  else return p
>

expandUser "~"         = fmap homeDirectory getLoginName
expandUser ('~':'/':p) = getLoginName >>=
                         fmap ((++ p) . homeDirectory)
                              getUserEntryForName
expandUser ('~':up)    = let (u,p) = break (== '/') up
                          in fmap ((++ (drop 1 p)) . homeDirectory
                                  (getUserEntryForName u)
expandUser p           = p

Although arguably there should be some error checking.

-- 
brandon s allbery                                      allbery.b at gmail.com
wandering unix systems administrator (available)     (412) 475-9364 vm/sms
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