Refactor GFI to treat command line files and the i command uniformly. Disable CSE by default in GFI.

src-3.0/GF/Command/Importing.hs

@@ -14,6 +14,7 @@ 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
     s | elem s [".gf",".gfo"] -> do

src-3.0/GF/Command/Interpreter.hs

@@ -1,5 +1,6 @@
 module GF.Command.Interpreter (
   CommandEnv (..),
+  mkCommandEnv,
   interpretCommandLine
   ) where
 
@@ -21,6 +22,9 @@ data CommandEnv = CommandEnv {
   commands     :: Map.Map String CommandInfo
   }
 
+mkCommandEnv :: PGF -> CommandEnv
+mkCommandEnv pgf = CommandEnv pgf (allCommands pgf)
+
 interpretCommandLine :: CommandEnv -> String -> IO ()
 interpretCommandLine env line = case (pCommandLine (myLexer line)) of
   Ok CEmpty -> return ()