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96 lines
2.7 KiB
96 lines
2.7 KiB
import System.Environment
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import System.Directory
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import System.IO
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import System.Exit (exitSuccess,exitFailure)
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import Data.List
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type EnvKey = String
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type EnvValue = String
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data EnvFile =
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End
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| Entry EnvKey EnvValue EnvFile
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deriving (Show,Eq,Read)
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main = do
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args <- getArgs
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cliRun args
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cliRun :: [String] -> IO ()
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cliRun ("get":args) = cliGet args
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cliRun ("set":args) = cliSet args
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cliRun ("unset":args) = cliUnset args
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cliRun ("list":_) = cliList
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cliRun _ = cliFail "USAGE: fenv <get|set|unset> [...args]"
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cliGet :: [String] -> IO ()
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cliGet (name:_) = do
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env <- getEnvFile
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case (getEntry env name) of
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(Just value) -> putStrLn value
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Nothing -> cliFail "ERROR: No value defined"
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cliGet _ = cliFail "USAGE: fenv get <name>"
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cliUnset :: [String] -> IO ()
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cliUnset (name:_) = do
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env <- getEnvFile
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let env' = (removeEntry env name) in
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replaceEnvFile env'
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cliUnset _ = cliFail "USAGE: fenv unset <name>"
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cliSet :: [String] -> IO ()
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cliSet (name:value:_) = do
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env <- getEnvFile
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let env' = (setEntry env name value) in
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replaceEnvFile env'
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cliSet _ = cliFail "USAGE: fenv set <name> <value>"
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cliList :: IO ()
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cliList = do
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env <- getEnvFile
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printLevel env
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where
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printLevel (Entry key value rest) = putStrLn (key ++ ": " ++ value) >>= (printLevel rest)
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printLevel End = return ()
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cliFail :: String -> IO ()
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cliFail message = putStrLn message >>= return exitFailure
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setEntry :: EnvFile -> EnvKey -> EnvValue -> EnvFile
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setEntry env key value = let env'=(removeEntry env key) in
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(Entry key value env')
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removeEntry :: EnvFile -> EnvKey -> EnvFile
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removeEntry End _ = End
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removeEntry (Entry entryKey entryValue rest) key = if entryKey==key
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then rest
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else (Entry entryKey entryValue (removeEntry rest key))
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getEntry :: EnvFile -> EnvKey -> Maybe EnvValue
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getEntry End _ = Nothing
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getEntry (Entry entryKey entryValue rest) key = if entryKey==key
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then return entryValue
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else (getEntry rest key)
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replaceEnvFile :: EnvFile -> IO ()
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replaceEnvFile env = do
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path <- getEnvFilePath
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(tempName, tempHandle) <- openTempFile "/tmp" ".fenv"
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hPutStr tempHandle (show env)
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hClose tempHandle
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removeFile path
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renameFile tempName path
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getEnvFile :: IO EnvFile
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getEnvFile = do
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path <- getEnvFilePath
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contents <- readFile path
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if contents == "" then return End
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else return $ read contents
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getEnvFilePath :: IO FilePath
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getEnvFilePath = do
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home <- getHomeDirectory
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return (home ++ "/.fenv")
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