Untested minimal viable parser

1 files changed, 23 insertions, 1 deletions

diff --git a/Main.hs b/Main.hs
index 72f36b2..53b2472 100644
--- a/Main.hs
+++ b/Main.hs
@@ -1,5 +1,27 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE TupleSections #-}
 module Main where
 
+import System.Environment (getArgs)
+import System.Exit (die, exitFailure)
+
+import Parser
+
 
 main :: IO ()
-main = putStrLn "hoi"
+main = do
+    (source, fname) <- getArgs >>= \case
+        [] -> (,"<stdin>") <$> getContents
+        [fname] -> (,fname) <$> readFile fname
+        _ -> die "Usage: hs-visinter [filename.hs]"
+
+    prog <- case parse fname source of
+      This errs -> do
+          mapM_ (putStrLn . printErrMsg) errs
+          exitFailure
+      These errs res -> do
+          mapM_ (putStrLn . printErrMsg) errs
+          return res
+      That res -> return res
+
+    print prog