1 files changed, 50 insertions, 0 deletions
diff --git a/src/compiler/GF/Command/Importing.hs b/src/compiler/GF/Command/Importing.hs
new file mode 100644
index 000000000..06deab6c6
--- /dev/null
+++ b/src/compiler/GF/Command/Importing.hs
@@ -0,0 +1,50 @@
+module GF.Command.Importing (importGrammar, importSource) where
+
+import PGF
+import PGF.Data
+
+import GF.Compile
+import GF.Grammar.Grammar (SourceGrammar) -- for cc command
+import GF.Grammar.CF
+import GF.Infra.UseIO
+import GF.Infra.Option
+import GF.Data.ErrM
+
+import Data.List (nubBy)
+import System.FilePath
+
+-- import a grammar in an environment where it extends an existing grammar
+importGrammar :: PGF -> Options -> [FilePath] -> IO PGF
+importGrammar pgf0 _ [] = return pgf0
+importGrammar pgf0 opts files =
+  case takeExtensions (last files) of
+    ".cf" -> do
+       s  <- fmap unlines $ mapM readFile files 
+       let cnc = justModuleName (last files)
+       gf <- case getCF cnc s of
+               Ok g -> return g
+               Bad s -> error s ---- 
+       Ok gr <- appIOE $ compileSourceGrammar opts gf
+       epgf <- appIOE $ link opts (cnc ++ "Abs") gr
+       case epgf of
+         Ok pgf -> return pgf
+         Bad s -> error s ----
+    s | elem s [".gf",".gfo"] -> do
+      res <- appIOE $ compileToPGF opts files
+      case res of
+        Ok pgf2 -> do return $ unionPGF pgf0 pgf2
+        Bad msg -> do putStrLn ('\n':'\n':msg)
+                      return pgf0
+    ".pgf" -> do
+      pgf2 <- mapM readPGF files >>= return . foldl1 unionPGF
+      return $ unionPGF pgf0 pgf2
+    ext -> die $ "Unknown filename extension: " ++ show ext
+
+importSource :: SourceGrammar -> Options -> [FilePath] -> IO SourceGrammar
+importSource src0 opts files = do
+  src <- appIOE $ batchCompile opts files
+  case src of
+    Ok gr -> return gr
+    Bad msg -> do 
+      putStrLn msg
+      return src0