30 lines
891 B
Haskell
30 lines
891 B
Haskell
-- Driver for the Lamb programming language
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-- Copyright (c) 2013 darkf
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-- Licensed under the terms of the zlib license, see LICENSE for details
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import System.Environment (getArgs)
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import System.Directory (doesFileExist)
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import Interp (evalProgram, evalString, Value(UnitV))
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-- returns Nothing if all files exist, or Just path for the first one that doesn't
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allExist :: [String] -> IO (Maybe String)
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allExist [] = return Nothing
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allExist (x:xs) = do
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exists <- doesFileExist x
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if exists then allExist xs
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else return $ Just x
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evalFile :: String -> IO Value
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evalFile path = do
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contents <- readFile path
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let ev = evalString contents
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if ev == UnitV then return ev else return ev -- this is just to force evaluation
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main = do
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args <- getArgs
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exist <- allExist args
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case exist of
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Just file -> putStrLn $ "error: file " ++ file ++ " doesn't exist"
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Nothing ->
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mapM_ evalFile args
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