1 files changed, 38 insertions, 0 deletions
diff --git a/fractran.hs b/fractran.hs
new file mode 100644
index 0000000..7f3946f
--- /dev/null
+++ b/fractran.hs
@@ -0,0 +1,38 @@
+
+import System.Environment( getArgs )
+import Data.Typeable
+import qualified Control.Exception
+import Fractran.Parser
+import Fractran.Interpreter
+
+
+data FractranException = FractranException { errString :: String }
+    deriving (Show, Typeable)
+
+instance Control.Exception.Exception FractranException
+
+
+
+usageString :: String
+usageString = "Usage: fractran <program file>"
+
+
+
+program :: IO ()
+program = do
+	args <- getArgs
+	fileContents <- if (length args /= 1)
+		            then Control.Exception.throw (FractranException usageString)
+		            else readFile (head args)
+
+	case (parseFractran fileContents) of
+		Left x -> putStrLn (show x)
+		Right x -> putStrLn (show (fractran x))
+
+
+
+main = Control.Exception.catch program handler
+        where
+        	handler :: FractranException -> IO ()
+        	handler err = putStrLn (errString err)
+