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module Main (main) where
import System.Environment
import Control.Monad.Except
import System.Console.Haskeline
import Utils
import Builtins
import Lib
parseArgs :: Config -> [String] -> Config
parseArgs config args =
case args of
("-i":fileName:rest) -> parseArgs
config { configScriptFileName = Just fileName } rest
("-v":rest) -> parseArgs
config { configVerboseMode = True } rest
("-h":rest) -> parseArgs
config { configShowHelp = True } rest
("-e":rest) -> parseArgs
config { configPrintEvaled = True } rest
_ -> config
repl :: Config -> Env -> InputT IO ()
repl config env = do
minput <- getInputLine "> "
case minput of
Nothing -> return ()
Just input -> do
result <- lift $ runL config (runInlineScript env input)
case result of
Left (LException ex) -> do
outputStrLn $ "Error: " ++ ex
repl config env
Right (newEnv, _) -> do
repl config newEnv
main :: IO ()
main = do
args <- getArgs
progName <- getProgName
let initialConfig = Config {
configScriptFileName = Nothing,
configVerboseMode = False,
configShowHelp = False,
configPrintEvaled = False
}
let config = parseArgs initialConfig args
if (configShowHelp config) then do
putStrLn $ "Usage: " ++ progName ++ " # to open REPL"
putStrLn $ " " ++ progName ++ " -i scriptFile # to run script file"
putStrLn $ " " ++ progName ++ " -h # to show this help"
putStrLn $ " " ++ progName ++ " -e # to automatically print results of evaluated expressions to stdout"
else do
when (configVerboseMode config) $ do
putStrLn $ "configScriptFileName:\t" ++ (show $ configScriptFileName config)
putStrLn $ "configVerboseMode:\t" ++ (show $ configVerboseMode config)
case (configScriptFileName config) of
Just scriptFileName -> do
result <- runL config (runScriptFile builtinEnv scriptFileName)
case result of
Left (LException ex) -> putStrLn $ "Error: " ++ ex
Right _ -> return ()
Nothing -> do
putStrLn $ "Lang REPL"
putStrLn $ "Use CTRL+D to exit"
runInputT defaultSettings (repl config builtinEnv)
return ()
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