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|
{- user info
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP #-}
module Utility.UserInfo (
myHomeDir,
myUserName,
myUserGecos,
) where
import Control.Applicative
import System.PosixCompat
import Utility.Env
{- Current user's home directory.
-
- getpwent will fail on LDAP or NIS, so use HOME if set. -}
myHomeDir :: IO FilePath
myHomeDir = myVal env homeDirectory
where
#ifndef __WINDOWS__
env = ["HOME"]
#else
env = ["USERPROFILE", "HOME"] -- HOME is used in Cygwin
#endif
{- Current user's user name. -}
myUserName :: IO String
myUserName = myVal env userName
where
#ifndef __WINDOWS__
env = ["USER", "LOGNAME"]
#else
env = ["USERNAME", "USER", "LOGNAME"]
#endif
myUserGecos :: IO String
#ifdef __ANDROID__
myUserGecos = return "" -- userGecos crashes on Android
#else
myUserGecos = myVal [] userGecos
#endif
myVal :: [String] -> (UserEntry -> String) -> IO String
myVal envvars extract = maybe (extract <$> getpwent) return =<< check envvars
where
check [] = return Nothing
check (v:vs) = maybe (check vs) (return . Just) =<< getEnv v
getpwent = getUserEntryForID =<< getEffectiveUserID
|
