feat[app]: Parsing and printing the program

app/Main.hs

@@ -1,4 +1,19 @@
+{-# LANGUAGE LambdaCase #-}
 module Main (main) where
+import Control.Monad ((<$!>))
+
+import qualified System.Environment as Env
+
+import qualified Language.Brainfuck as Brainfuck
+import qualified Data.Text as Text
+import qualified Data.Text.IO as TextIO
 
 main :: IO ()
-main = pure ()
+main = do
+  programFile <- Env.getArgs >>= \case
+    [x] -> pure x
+    _   -> error "usage: [program] source.bf"
+
+  instructions <- Brainfuck.parse <$!> TextIO.readFile programFile
+
+  mapM_ (TextIO.putStrLn . Text.pack . show) instructions