add input and output commands parsing and call compilation

.gitignore

@@ -1,2 +1,3 @@
 .stack-work
-tests/runnable/*
+tests/runnable/*
+.idea

exec/Main.hs

@@ -0,0 +1,51 @@
+{-# LANGUAGE OverloadedStrings #-}
+module Main where
+
+import qualified Data.ByteString.Lazy as LBS
+
+import qualified Language.Wasm.Lexer as Lexer
+import qualified Language.Wasm.Parser as Parser
+import qualified Language.Wasm.Binary as Binary
+
+import Options.Applicative
+import Data.Semigroup ((<>))
+import Wasm.WasmParser
+
+import Data.Maybe (fromMaybe)
+
+data OutputMode = WasmBinary | JSWrapper deriving (Show, Eq)
+
+data WasmConfig = WasmConfig {
+    inputFile :: String,
+    outputFile :: String,
+    outputMode :: OutputMode
+} deriving (Show, Eq)
+
+compile :: String -> String -> IO ()
+compile input output = do
+  content <- LBS.readFile input
+  case Lexer.scanner content >>= Parser.parseModule of
+    Right mod ->
+      LBS.writeFile output $ Binary.dumpModuleLazy mod
+    Left reason ->
+      putStrLn $ "Cannot complie module: " ++ reason
+
+main :: IO ()
+main = do
+     config <- execParser opts
+     process config
+   where
+     opts = info (sample <**> helper)
+       ( fullDesc
+      <> progDesc "Haskell WebAssembly Toolkit"
+      <> header "Compile WebAssembly code into binary" )
+
+process :: WasmParser -> IO ()
+
+process (WasmParser (Just output) input) =
+  compile input output
+
+process (WasmParser Nothing input) =
+  compile input "out.wasm"
+
+process _ = return ()

exec/Wasm/WasmParser.hs

@@ -0,0 +1,25 @@
+module Wasm.WasmParser where
+
+import Options.Applicative
+import Data.Semigroup ((<>))
+
+--data WasmFileFormat = WasmText | WasmBinary | WasmScript deriving (Read, Show)
+--
+--instance Read WasmFileFormat where
+--    readsPrec _ ("WAT":xs) = [ (WasmText, xs) ]
+--    readsPrec _ ("WAST":xs) = [ (WasmScript, xs) ]
+--    readsPrec _ ("WASM":xs) = [ (WasmBinary, xs) ]
+
+data WasmParser = WasmParser
+  { output     :: Maybe String
+  , input      :: String }
+
+sample :: Parser WasmParser
+sample = WasmParser
+      <$> option (maybeReader (Just . Just))
+          ( long "output"
+         <> short 'o'
+         <> metavar "OUTPUT_FILE"
+         <> help "Output filename"
+         <> value Nothing )
+      <*> argument str (metavar "INPUT_FILE")

package.yaml

@@ -31,6 +31,15 @@ library:
   - containers           >= 0.5  && <0.6
   - utf8-string          >= 1.0
 
+executables:
+  wasm:
+    source-dirs: exec
+    main: Main.hs
+    dependencies: 
+    - wasm == 0.1.0
+    - base
+    - optparse-applicative
+
 tests:
   test:
     main: Test.hs

wasm.cabal

@@ -50,6 +50,18 @@ library
       Paths_wasm
   default-language: Haskell2010
 
+executable wasm
+  main-is: Main.hs
+  hs-source-dirs: exec
+  build-depends:
+      base >=4.6 && <5.0
+    , wasm ==0.1.0
+    , optparse-applicative >= 0.14
+    , bytestring >=0.10 && <0.11
+  other-modules:
+    Wasm.WasmParser
+
+
 test-suite test
   type: exitcode-stdio-1.0
   main-is: Test.hs