--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/pas2c/Main.hs	Tue Jan 21 22:38:13 2014 +0100
@@ -0,0 +1,82 @@
+module Main( main ) where
+
+import System.Console.GetOpt
+import System.Environment
+import System.Exit
+import System.IO
+import Data.Maybe( fromMaybe, isJust, fromJust )
+import Data.List (find, intercalate)
+import Control.Monad
+import Pas2C
+
+main = do
+    args <- getArgs
+    if length args == 0
+    then do
+        name <- getProgName
+        hPutStrLn stderr $ usageInfo header options
+        exitFailure
+    else do
+        case getOpt RequireOrder options args of
+          (flags, [],      []) | enoughFlags flags -> do
+                let m = flag flags isName
+                let i = flag flags isInput
+                let o = flag flags isOutput
+                let a = fromMaybe o $ liftM extractString $ find isAlt flags
+                let symbols = ["PAS2C", "FPC"] ++ (map extractString $ filter isSymbol flags)
+                hPutStrLn stdout $ "--------Pas2C Config--------"
+                hPutStrLn stdout $ "Main module: " ++ m
+                hPutStrLn stdout $ "Input path : " ++ i
+                hPutStrLn stdout $ "Output path: " ++ o
+                hPutStrLn stdout $ "Altern path: " ++ a
+                hPutStrLn stdout $ "Symbols defined: " ++ (intercalate ", " symbols)
+                hPutStrLn stdout $ "----------------------------"
+                pas2C m (i++"/") (o++"/") (a++"/") symbols
+                hPutStrLn stdout $ "----------------------------"
+                      | otherwise ->  error $ usageInfo header options
+          (_,     nonOpts, [])     -> error $ "unrecognized arguments: " ++ unwords nonOpts
+          (_,     _,       msgs)   -> error $ usageInfo header options
+    where
+        header = "Freepascal to C conversion! Please specify -n -i -o options.\n"
+        enoughFlags f = and $ map (isJust . flip find f) [isName, isInput, isOutput]
+        flag f = extractString . fromJust . flip find f
+
+
+data Flag = HelpMessage
+          | Name String
+          | Input String
+          | Output String
+          | Alternate String
+          | Symbol String
+
+
+extractString :: Flag -> String
+extractString (Name s) = s
+extractString (Input s) = s
+extractString (Output s) = s
+extractString (Alternate s) = s
+extractString (Symbol s) = s
+extractString _ = undefined
+
+isName, isInput, isOutput, isAlt, isSymbol :: Flag -> Bool
+isName (Name _) = True
+isName _ = False
+isInput (Input _) = True
+isInput _ = False
+isOutput (Output _) = True
+isOutput _ = False
+isAlt (Alternate _) = True
+isAlt _ = False
+isSymbol (Symbol _) = True
+isSymbol _ = False
+
+options :: [OptDescr Flag]
+options = [
+    Option ['h'] ["help"]      (NoArg HelpMessage)      "print this help message",
+    Option ['n'] ["name"]      (ReqArg Name "MAIN")     "name of the main Pascal module",
+    Option ['i'] ["input"]     (ReqArg Input "DIR")     "input directory, where .pas files will be read",
+    Option ['o'] ["output"]    (ReqArg Output "DIR")    "output directory, where .c/.h files will be written",
+    Option ['a'] ["alternate"] (ReqArg Alternate "DIR") "alternate input directory, for out of source builds",
+    Option ['d'] ["define"]    (ReqArg Symbol "SYMBOL") "define symbol"
+  ]
+