move gfLibraryPath and gfGrammarPath to UseIO. Now they are accessible and there is only one place to change if you want to use different envVar

src/GF/Compile/Compile.hs

@@ -60,9 +60,6 @@ import Control.Monad
 import System.Directory
 import System.FilePath
 
--- | environment variable for grammar search path
-gfGrammarPathVar = "GF_GRAMMAR_PATH"
-
 -- | in batch mode: write code in a file
 batchCompile f = liftM fst $ compileModule defOpts emptyShellState f
   where
@@ -115,7 +112,7 @@ compileModule opts1 st0 file = do
   let ps1 = if (useFileOpt && not useLineOpt) 
               then (ps0 ++ map (combine fpath) ps0)
               else ps0
-  ps <- ioeIO $ extendPathEnv gfLibraryPath gfGrammarPathVar ps1
+  ps <- ioeIO $ extendPathEnv ps1
   let ioeIOIf = if oElem beVerbose opts then ioeIO else (const (return ()))
   ioeIOIf $ putStrLn $ "module search path:" +++ show ps ----
   let st = st0 --- if useFileOpt then emptyShellState else st0
@@ -396,7 +393,7 @@ getGFEFiles opts1 file = useIOE [] $ do
   let ps1 = if (useFileOpt && not useLineOpt) 
               then (map (combine fpath) ps0)
               else ps0
-  ps <- ioeIO $ extendPathEnv gfLibraryPath gfGrammarPathVar ps1
+  ps <- ioeIO $ extendPathEnv ps1
   let file' = if useFileOpt then takeFileName file else file -- to find file itself
   files <- getAllFiles opts ps [] file'
   efiles <- ioeIO $ filterM doesFileExist [replaceExtension f "gfe" | f <- files]

src/GF/Devel/Compile.hs

@@ -48,9 +48,6 @@ prMod :: SourceModule -> String
 prMod = compactPrint . prModule
 
 
--- | environment variable for grammar search path
-gfGrammarPathVar = "GF_GRAMMAR_PATH"
-
 -- | the environment
 type CompileEnv = (Int,SourceGrammar)
 
@@ -71,7 +68,7 @@ compileModule opts1 env file = do
   let ps1 = if (useFileOpt && not useLineOpt) 
               then (ps0 ++ map (combine fpath) ps0)
               else ps0
-  ps <- ioeIO $ extendPathEnv gfLibraryPath gfGrammarPathVar ps1
+  ps <- ioeIO $ extendPathEnv ps1
   let ioeIOIf = if oElem beVerbose opts then ioeIO else (const (return ()))
   ioeIOIf $ putStrLn $ "module search path:" +++ show ps ----
   let sgr = snd env

src/GF/Devel/Compile/Compile.hs

@@ -44,9 +44,6 @@ intermOut opts opt s =
 prMod :: SourceModule -> String
 prMod = prModule
 
--- | environment variable for grammar search path
-gfGrammarPathVar = "GF_GRAMMAR_PATH"
-
 -- | the environment
 type CompileEnv = (Int,GF)
 
@@ -67,7 +64,7 @@ compileModule opts1 env file = do
   let ps1 = if (useFileOpt && not useLineOpt) 
               then (ps0 ++ map (combine fpath) ps0)
               else ps0
-  ps <- ioeIO $ extendPathEnv gfLibraryPath gfGrammarPathVar ps1
+  ps <- ioeIO $ extendPathEnv ps1
   let ioeIOIf = if oElem beVerbose opts then ioeIO else (const (return ()))
   ioeIOIf $ putStrLn $ "module search path:" +++ show ps ----
   let sgr = snd env

src/GF/Devel/UseIO.hs

@@ -122,10 +122,13 @@ doesFileExistPath paths file = do
   mpfile <- ioeIO $ getFilePathMsg "" paths file
   return $ maybe False (const True) mpfile
 
+gfLibraryPath    = "GF_LIB_PATH"
+gfGrammarPathVar = "GF_GRAMMAR_PATH"
+
 getLibraryPath :: IO FilePath
 getLibraryPath =
   catch
-    (getEnv "GF_LIB_PATH")
+    (getEnv gfLibraryPath)
 #ifdef mingw32_HOST_OS
     (\_ -> do exepath <- getModuleFileName nullPtr
               let (path,_) = splitFileName exepath
@@ -134,23 +137,26 @@ getLibraryPath =
     (const (return libdir))
 #endif
 
--- | first var is lib prefix, second is like class path
+-- | extends the search path with the
--- | path in environment variable has lower priority
+-- 'gfLibraryPath' and 'gfGrammarPathVar'
-extendPathEnv :: String -> String -> [FilePath] -> IO [FilePath]
+-- environment variables. Returns only existing paths.
-extendPathEnv lib var ps = do
+extendPathEnv :: [FilePath] -> IO [FilePath]
+extendPathEnv ps = do
   b <- getLibraryPath                             -- e.g. GF_LIB_PATH
-  s <- catch (getEnv var) (const (return ""))     -- e.g. GF_GRAMMAR_PATH
+  s <- catch (getEnv gfGrammarPathVar) (const (return ""))     -- e.g. GF_GRAMMAR_PATH
   let ss = ps ++ splitSearchPath s
   liftM concat $ mapM allSubdirs $ ss ++ [b </> s | s <- ss ++ ["prelude"]]
   where
     allSubdirs :: FilePath -> IO [FilePath]
     allSubdirs [] = return [[]]
     allSubdirs p = case last p of
-      '*' -> do
+      '*' -> do let path = init p
-        let path = init p
+                fs <- getSubdirs path
-        fs <- getSubdirs path
+                return [path </> f | f <- fs]
-        return [path </> f | f <- fs]
+      _   -> do exists <- doesDirectoryExist p
-      _ -> return [p]
+                if exists
+                  then return [p]
+                  else return []
 
 getSubdirs :: FilePath -> IO [FilePath]
 getSubdirs dir = do
@@ -278,8 +284,6 @@ putPointEgen cond opts msg act = do
 putPointEVerb :: Options -> String -> IOE a -> IOE a
 putPointEVerb opts = putPointE (addOption beVerbose opts)
 
-gfLibraryPath = "GF_LIB_PATH"
-
 -- ((do {s <- readFile f; return (return s)}) ) 
 readFileIOE :: FilePath -> IOE BS.ByteString
 readFileIOE f = ioe $ catch (BS.readFile f >>= return . return)

src/GF/Infra/UseIO.hs

@@ -126,10 +126,15 @@ doesFileExistPath paths file = do
   mpfile <- ioeIO $ getFilePathMsg "" paths file
   return $ maybe False (const True) mpfile
 
+gfLibraryPath    = "GF_LIB_PATH"
+
+-- | environment variable for grammar search path
+gfGrammarPathVar = "GF_GRAMMAR_PATH"
+
 getLibraryPath :: IO FilePath
 getLibraryPath =
   catch
-    (getEnv "GF_LIB_PATH")
+    (getEnv gfLibraryPath)
 #ifdef mingw32_HOST_OS
     (\_ -> do exepath <- getModuleFileName nullPtr
               let (path,_) = splitFileName exepath
@@ -138,23 +143,26 @@ getLibraryPath =
     (const (return libdir))
 #endif
 
--- | first var is lib prefix, second is like class path
+-- | extends the search path with the
--- | path in environment variable has lower priority
+-- 'gfLibraryPath' and 'gfGrammarPathVar'
-extendPathEnv :: String -> String -> [FilePath] -> IO [FilePath]
+-- environment variables. Returns only existing paths.
-extendPathEnv lib var ps = do
+extendPathEnv :: [FilePath] -> IO [FilePath]
+extendPathEnv ps = do
   b <- getLibraryPath                             -- e.g. GF_LIB_PATH
-  s <- catch (getEnv var) (const (return ""))     -- e.g. GF_GRAMMAR_PATH
+  s <- catch (getEnv gfGrammarPathVar) (const (return ""))     -- e.g. GF_GRAMMAR_PATH
   let ss = ps ++ splitSearchPath s
   liftM concat $ mapM allSubdirs $ ss ++ [b </> s | s <- ss ++ ["prelude"]]
   where
     allSubdirs :: FilePath -> IO [FilePath]
     allSubdirs [] = return [[]]
     allSubdirs p = case last p of
-      '*' -> do
+      '*' -> do let path = init p
-        let path = init p
+                fs <- getSubdirs path
-        fs <- getSubdirs path
+                return [path </> f | f <- fs]
-        return [path </> f | f <- fs]
+      _   -> do exists <- doesDirectoryExist p
-      _ -> return [p]
+                if exists
+                  then return [p]
+                  else return []
 
 getSubdirs :: FilePath -> IO [FilePath]
 getSubdirs dir = do
@@ -291,8 +299,6 @@ putPointE opts msg act = do
 putPointEVerb :: Options -> String -> IOE a -> IOE a
 putPointEVerb opts = putPointE (addOption beVerbose opts)
 
-gfLibraryPath = "GF_LIB_PATH"
-
 -- ((do {s <- readFile f; return (return s)}) ) 
 readFileIOE :: FilePath -> IOE (String)
 readFileIOE f = ioe $ catch (readFileStrict f >>= return . return)