32 lines
814 B
Haskell
32 lines
814 B
Haskell
{- user info
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Utility.UserInfo (
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myHomeDir,
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myUserName
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) where
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import Control.Applicative
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import System.Posix.User
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import System.Posix.Env
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{- Current user's home directory.
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-
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- getpwent will fail on LDAP or NIS, so use HOME if set. -}
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myHomeDir :: IO FilePath
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myHomeDir = myVal ["HOME"] homeDirectory
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{- Current user's user name. -}
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myUserName :: IO String
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myUserName = myVal ["USER", "LOGNAME"] userName
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myVal :: [String] -> (UserEntry -> String) -> IO String
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myVal envvars extract = maybe (extract <$> getpwent) return =<< check envvars
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where
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check [] = return Nothing
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check (v:vs) = maybe (check vs) (return . Just) =<< getEnv v
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getpwent = getUserEntryForID =<< getEffectiveUserID
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