Add mima-asm program

app/MimaAsm/Main.hs

@@ -0,0 +1,45 @@
+module Main where
+
+import qualified Data.Text.IO as T
+import           Options.Applicative
+import           Text.Megaparsec
+
+import           Mima.Assembler.Parser
+import           Mima.Load
+
+data Settings = Settings
+  { infile     :: String
+  , outfile    :: String
+  } deriving (Show)
+
+settingsParser :: Parser Settings
+settingsParser = Settings
+  <$> strArgument
+      (metavar "INFILE"
+       <> help "The .mimasm file to assemble")
+  <*> strOption
+      (long "out"
+       <> short 'o'
+       <> metavar "OUTFILE"
+       <> help "The .mima file to write the assembled result to"
+       <> value "out.mima"
+       <> showDefault)
+
+opts :: ParserInfo Settings
+opts = info (helper <*> settingsParser) $ fullDesc <> failureCode 1
+
+main :: IO ()
+main = do
+  settings <- execParser opts
+
+  putStrLn $ "Loading assembly file at " ++ infile settings
+  asm <- T.readFile (infile settings)
+
+  putStrLn "Parsing assembly"
+  let parsed = parse parseState (infile settings) asm
+  case parsed of
+    Left errorBundle      -> putStrLn $ errorBundlePretty errorBundle
+    Right (state, _) -> do
+      putStrLn "Parsing successful"
+      putStrLn $ "Writing result to " ++ outfile settings
+      saveStateToFile (outfile settings) state