Expands CLI support with output forms and decoding

Adds CLI options for compiling to a Tree Calculus, AST, Ternary, and
ASCII tree view. Adds CLI command for attempted decoding of a compiled
result to Number/String/List.

src/REPL.hs

@@ -27,18 +27,18 @@ repl env = runInputT defaultSettings (loop env)
         Just input -> do
           newEnv <- liftIO $ (processInput env input `catch` errorHandler env)
           loop newEnv
-
-    processInput :: Env -> String -> IO (Env)
+  
+    processInput :: Env -> String -> IO Env
     processInput env input = do
-      let clearEnv = Map.delete "__result" env
-          newEnv = evalSingle clearEnv (parseSingle input)
+      let asts = parseTricu input
+          newEnv = evalTricu env asts
       case Map.lookup "__result" newEnv of
         Just r -> do
           putStrLn $ "tricu > " ++ show r
           putStrLn $ "READ -: \"" ++ decodeResult r ++ "\""
         Nothing -> return ()
       return newEnv
-
+    
     errorHandler :: Env -> SomeException -> IO (Env)
     errorHandler env e = do
       putStrLn $ "Error: " ++ show e