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-rw-r--r--apps/ListPath.hs66
1 files changed, 33 insertions, 33 deletions
diff --git a/apps/ListPath.hs b/apps/ListPath.hs
index 75f1b27..b964998 100644
--- a/apps/ListPath.hs
+++ b/apps/ListPath.hs
@@ -4,33 +4,33 @@
- See LICENSE.txt for details.
-}
-module Main ( main ) where
+module Main (main) where
import System.Console.GetOpt
-import System.Directory ( doesDirectoryExist )
-import System.Environment ( getArgs, getProgName )
-import System.Exit ( exitFailure, exitSuccess )
-import System.IO ( hPutStr, stderr )
+import System.Directory (doesDirectoryExist)
+import System.Environment (getArgs, getProgName)
+import System.Exit (exitFailure, exitSuccess)
+import System.IO (hPutStr, stderr)
import qualified Environment
main :: IO ()
main = do
- rawArgs <- getArgs
- case getOpt Permute optionDescription rawArgs of
- (actions, args, []) -> do
- options <- foldl (>>=) (return defaultOptions) actions
- case args of
- [] -> listPath options
- _ -> invalidNumberOfArguments
- (_, _, errorMessages) -> exitWithUsageErrors errorMessages
+ rawArgs <- getArgs
+ case getOpt Permute optionDescription rawArgs of
+ (actions, args, []) -> do
+ options <- foldl (>>=) (return defaultOptions) actions
+ case args of
+ [] -> listPath options
+ _ -> invalidNumberOfArguments
+ (_, _, errorMessages) -> exitWithUsageErrors errorMessages
listPath :: Options -> IO ()
listPath options = do
- val <- Environment.getEnv $ name options
- mapM_ printPath $ Environment.splitPaths val
- where
- printPath p = do
+ val <- Environment.getEnv $ name options
+ mapM_ printPath $ Environment.splitPaths val
+ where
+ printPath p = do
exists <- doesDirectoryExist p
putStrLn $ (if exists then "+" else "-") ++ " " ++ p
@@ -41,32 +41,32 @@ defaultOptions = Options { name = "PATH" }
buildHelpMessage :: IO String
buildHelpMessage = do
- header <- buildHeader
- return $ usageInfo header optionDescription
- where
- buildHeader :: IO String
- buildHeader = do
+ header <- buildHeader
+ return $ usageInfo header optionDescription
+ where
+ buildHeader :: IO String
+ buildHeader = do
progName <- getProgName
return $ "Usage: " ++ progName ++ " [OPTIONS...]\nOptions:"
exitWithHelpMessage :: a -> IO b
exitWithHelpMessage _ = do
- helpMessage <- buildHelpMessage
- putStr helpMessage
- exitSuccess
+ helpMessage <- buildHelpMessage
+ putStr helpMessage
+ exitSuccess
exitWithUsageErrors :: [String] -> IO a
exitWithUsageErrors errorMessages = do
- hPutStr stderr $ concatMap ("Usage error: " ++) errorMessages
- helpMessage <- buildHelpMessage
- hPutStr stderr helpMessage
- exitFailure
+ hPutStr stderr $ concatMap ("Usage error: " ++) errorMessages
+ helpMessage <- buildHelpMessage
+ hPutStr stderr helpMessage
+ exitFailure
invalidNumberOfArguments :: IO a
invalidNumberOfArguments = exitWithUsageErrors ["invalid number of arguments\n"]
optionDescription :: [OptDescr (Options -> IO Options)]
-optionDescription = [
- Option "n" ["name"] (ReqArg (\s opts -> return opts { name = s }) "NAME") "set the variable name ('PATH' by default)",
- Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
- ]
+optionDescription =
+ [ Option "n" ["name"] (ReqArg (\s opts -> return opts { name = s }) "NAME") "set the variable name ('PATH' by default)"
+ , Option "h" ["help"] (NoArg exitWithHelpMessage) "show this message and exit"
+ ]