1 files changed, 37 insertions, 0 deletions

diff --git a/tools/objcat.hs b/tools/objcat.hs
new file mode 100644
index 0000000..66ab9a9
--- /dev/null
+++ b/tools/objcat.hs
@@ -0,0 +1,37 @@
+import Data.Bool
+import qualified Data.ByteString.Lazy as L
+import qualified Data.DList as DList
+import qualified Data.IntMap as IntMap
+import Data.Char
+import Data.Maybe
+import System.Environment
+import Control.Monad.Writer.Lazy
+import Control.Monad.State.Strict
+
+import Wavefront.Lex
+import Wavefront
+
+zflip b = b
+    { vertex = \xs -> case xs of
+        x:y:z:ws -> vertex b (x:y:(-z):ws)
+        _        -> vertex b xs
+    , vertexN = \xs -> case xs of
+        x:y:z:ws -> vertexN b (x:y:(-z):ws)
+        _        -> vertexN b xs
+    , face = \ts -> face b $ reverse ts
+    }
+
+objcat b fs = (`evalStateT` renumFrom1) $ do
+    forM_ fs $ \f -> do
+        bs <- liftIO $ L.readFile f
+        parseCustom (applyRenumbering b) (modify' . addCounts) bs
+        return ()
+
+main = do
+    (b,fs) <- do
+        fs0 <- getArgs
+        case fs0 of
+            "--zflip":fs -> return (zflip echoBuilder, fs)
+            fs -> return (echoBuilder,fs)
+    out <- DList.toList <$> execWriterT (objcat b fs)
+    putStrLn $ unlines out