63 lines
1.3 KiB
Haskell
63 lines
1.3 KiB
Haskell
{- user info
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-
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- Copyright 2012 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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{-# LANGUAGE CPP #-}
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{-# OPTIONS_GHC -fno-warn-tabs #-}
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module Utility.UserInfo (
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myHomeDir,
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myUserName,
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myUserGecos,
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) where
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import Utility.Env
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import System.PosixCompat
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#ifndef mingw32_HOST_OS
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import Control.Applicative
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#endif
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import Prelude
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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 env homeDirectory
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where
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#ifndef mingw32_HOST_OS
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env = ["HOME"]
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#else
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env = ["USERPROFILE", "HOME"] -- HOME is used in Cygwin
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#endif
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{- Current user's user name. -}
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myUserName :: IO String
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myUserName = myVal env userName
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where
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#ifndef mingw32_HOST_OS
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env = ["USER", "LOGNAME"]
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#else
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env = ["USERNAME", "USER", "LOGNAME"]
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#endif
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myUserGecos :: IO (Maybe String)
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-- userGecos crashes on Android and is not available on Windows.
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#if defined(__ANDROID__) || defined(mingw32_HOST_OS)
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myUserGecos = return Nothing
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#else
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myUserGecos = Just <$> myVal [] userGecos
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#endif
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myVal :: [String] -> (UserEntry -> String) -> IO String
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myVal envvars extract = go envvars
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where
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#ifndef mingw32_HOST_OS
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go [] = extract <$> (getUserEntryForID =<< getEffectiveUserID)
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#else
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go [] = extract <$> error ("environment not set: " ++ show envvars)
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#endif
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go (v:vs) = maybe (go vs) return =<< getEnv v
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