{-
Copyright (C) 2022 Yuchen Pei.

This file is part of f2md.

f2md is free software: you can redistribute it and/or modify it under
the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

f2md is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General
Public License for more details.

You should have received a copy of the GNU Affero General Public
License along with f2md.  If not, see <https://www.gnu.org/licenses/>.

-}

module F2Md.Utils (expandPath) where

import System.Directory
import System.Posix.User

expandPath :: FilePath -> IO FilePath
expandPath path =
  let (pre, post) = break (=='/') path in
    case pre of
      "~" -> (++ post) <$> getHomeDirectory
      '~' : user -> (++ post) <$> homeDirectory <$> getUserEntryForName user
      _ -> return path