--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tools/Main.hs	Sun Nov 04 06:11:39 2012 +0100
@@ -0,0 +1,44 @@
+module Main( main ) where
+
+import System( getArgs )
+import System.Console.GetOpt
+import System.Environment
+import System.Exit
+import System.IO
+import Data.Maybe( fromMaybe )
+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, [],      [])     ->
+            if length args == 8 then do
+                pas2C (args !! 1) ((args !! 3)++"/") ((args !! 5)++"/") ((args !! 7)++"/")
+            else do
+                if length args == 6 then do
+                    pas2C (args !! 1) ((args !! 3)++"/") ((args !! 5)++"/") "./"
+                else do
+                    error $ usageInfo header options
+          (_,     nonOpts, [])     -> error $ "unrecognized arguments: " ++ unwords nonOpts
+          (_,     _,       msgs)   -> error $ usageInfo header options
+
+
+data Flag = HelpMessage | Name String | Input String | Output String | Alternate String
+
+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"
+  ]
+
+header = "Freepascal to C conversion!\n"
+

--- a/tools/pas2c.hs	Sun Nov 04 03:04:20 2012 +0100
+++ b/tools/pas2c.hs	Sun Nov 04 06:11:39 2012 +0100
@@ -1,5 +1,5 @@
 {-# LANGUAGE ScopedTypeVariables #-}
-module Main where
+module Pas2C where
 
 import Text.PrettyPrint.HughesPJ
 import Data.Maybe
@@ -1083,9 +1083,3 @@
 op2C "/" = "/(float)"
 op2C a = a
 
-main = do
-    let programName = "hwengine"
-    let inputPath = "../hedgewars/"
-    let outputPath = "./"
-    let alternateInputPath = "./"
-    pas2C programName inputPath alternateInputPath outputPath