Switch to new options handling.

This changes lots of stuff, let me know if it broke anything.

Comments:

- We use a local hacked version of GetOpt that allows long forms of commands to start with a single dash. This breaks other parts of GetOpt. For example, arguments to short options now require a =, and does not allo pace after the option character.

- The new command parsing is currently only used for the program command line, pragmas and the arguments for the 'i' shell command.

- I made a quick hack for the options for showTerm, which currently makes it impossible to use the print style flags for cc. This will be replaced by a facility for parsing command-specific options.

- The verbosity handling is broken in some places. I will fix that in a later patch.

src-3.0/GF.hs

@@ -2,12 +2,30 @@ module Main where
 
 import GFC
 import GFI
+import GF.Data.ErrM
+import GF.Infra.Option
+import GF.Infra.UseIO
+import Paths_gf
 
+import Data.Version
 import System.Environment (getArgs)
+import System.Exit
+import System.IO
 
 main :: IO ()
-main = do
-  args <- getArgs
-  case args of
-    "--batch":args -> mainGFC args
-    _              -> mainGFI args
+main = 
+    do args <- getArgs
+       case parseOptions args of
+         Ok (opts,files) -> mainOpts opts files
+         Bad err         -> do hPutStrLn stderr err
+                               hPutStrLn stderr "You may want to try --help."
+                               exitFailure
+
+mainOpts :: Options -> [FilePath] -> IO ()
+mainOpts opts files = 
+    case flag optMode opts of
+      ModeVersion     -> putStrLn $ "Grammatical Framework (GF) version " ++ showVersion version
+      ModeHelp        -> putStrLn helpMessage
+      ModeInteractive -> mainGFI opts files
+      ModeCompiler    -> dieIOE (mainGFC opts files)
+