From 65c8beecb14f6d09c49504d74beedd58cc7ddd17 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Wed, 7 Sep 2022 16:26:50 +0100
Subject: Better project layout, removed warnings

---
 app/Main.hs | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 app/Main.hs

(limited to 'app')

diff --git a/app/Main.hs b/app/Main.hs
new file mode 100644
index 0000000..5a16129
--- /dev/null
+++ b/app/Main.hs
@@ -0,0 +1,92 @@
+module Main where
+
+import Control.Monad (when)
+import Control.Monad.State (evalState)
+import qualified Data.Map as Map
+import Data.Maybe (fromMaybe)
+import Micro.Compiler
+import Micro.Error (showErrorList, showParserError)
+import Micro.Lexer (scan)
+import Micro.Parser (parse, parseFromFile)
+import System.Console.GetOpt
+import System.Environment (getProgName)
+import System.Environment.Blank (getArgs)
+import System.Exit (exitFailure, exitSuccess)
+import System.IO (hPutStr, hPutStrLn, stderr, stdout)
+
+version = "0.1.0"
+
+data Options = Options
+  { optParse :: Bool,
+    optHelp :: Bool,
+    optVersion :: Bool
+  }
+
+defOptions =
+  Options
+    { optParse = False,
+      optHelp = False,
+      optVersion = False
+    }
+
+options :: [OptDescr (Options -> Options)]
+options =
+  [ Option
+      ['p']
+      ["parse"]
+      (NoArg (\opts -> opts {optParse = True}))
+      "only parse, reporting any errors",
+    Option
+      ['h']
+      ["help"]
+      (NoArg (\opts -> opts {optHelp = True}))
+      "show help",
+    Option
+      ['v']
+      ["version"]
+      (NoArg (\opts -> opts {optVersion = True}))
+      "output version and exit"
+  ]
+
+usage :: String -> [String] -> IO ()
+usage progName errs
+  | null errs = do
+      putStrLn helpText
+      exitSuccess
+  | otherwise = do
+      hPutStrLn stderr ("error: " ++ concat errs ++ "Try " ++ progName ++ " -h for more information.")
+      exitFailure
+  where
+    header =
+      "Usage: "
+        ++ progName
+        ++ " [OPTION...] file"
+    helpText =
+      usageInfo header options
+
+compileFile :: String -> Bool -> IO ()
+compileFile filename onlyParse = do
+  res <- parseFromFile (scan parse) filename
+  case res of
+    Left err -> hPutStrLn stderr (showParserError err) >> exitFailure
+    Right ast -> do
+      res <- return $ evalState (compileAll ast) startState
+      case res of
+        Right _ -> if onlyParse then exitSuccess else print ast
+        Left errs -> hPutStr stderr (showErrorList errs) >> exitFailure
+
+main :: IO ()
+main = do
+  progName <- getProgName
+  argv <- getArgs
+  case getOpt Permute options argv of
+    (o, n, []) ->
+      do
+        when (optHelp opts) $ usage progName []
+        when (optVersion opts) $ putStrLn (progName ++ " " ++ version) >> exitSuccess
+        case n of
+          [filename] -> compileFile filename $ optParse opts
+          _ -> usage progName []
+      where
+        opts = foldl (flip id) defOptions o
+    (_, _, errs) -> usage progName errs
-- 
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