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diff --git a/yapps2.py b/yapps2.py
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+#!/usr/bin/python
+
+#
+# Yapps 2 - yet another python parser system
+# Copyright 1999-2003 by Amit J. Patel <amitp@cs.stanford.edu>
+#
+# This version of Yapps 2 can be distributed under the
+# terms of the MIT open source license, either found in the LICENSE file
+# included with the Yapps distribution
+# <http://theory.stanford.edu/~amitp/yapps/> or at
+# <http://www.opensource.org/licenses/mit-license.php>
+#
+
+import sys, re
+
+from yapps import runtime, parsetree
+
+def generate(inputfilename, outputfilename='', dump=0, **flags):
+    """Generate a grammar, given an input filename (X.g)
+    and an output filename (defaulting to X.py)."""
+
+    if not outputfilename:
+        if inputfilename.endswith('.g'):
+            outputfilename = inputfilename[:-2] + '.py'
+        else:
+            raise Exception('Must specify output filename if input filename is not *.g')
+        
+    DIVIDER = '\n%%\n' # This pattern separates the pre/post parsers
+    preparser, postparser = None, None # Code before and after the parser desc
+
+    # Read the entire file
+    s = open(inputfilename,'r').read()
+
+    # See if there's a separation between the pre-parser and parser
+    f = s.find(DIVIDER)
+    if f >= 0: preparser, s = s[:f]+'\n\n', s[f+len(DIVIDER):]
+
+    # See if there's a separation between the parser and post-parser
+    f = s.find(DIVIDER)
+    if f >= 0: s, postparser = s[:f], '\n\n'+s[f+len(DIVIDER):]
+
+    # Create the parser and scanner and parse the text
+    scanner = grammar.ParserDescriptionScanner(s, filename=inputfilename)
+    if preparser: scanner.del_line += preparser.count('\n')
+
+    parser = grammar.ParserDescription(scanner)
+    t = runtime.wrap_error_reporter(parser, 'Parser')
+    if t is None: return 1 # Failure
+    if preparser is not None: t.preparser = preparser
+    if postparser is not None: t.postparser = postparser
+
+    # Check the options
+    for f in t.options.keys():
+        for opt,_,_ in yapps_options:
+            if f == opt: break
+        else:
+            print >>sys.stderr, 'Warning: unrecognized option', f
+    # Add command line options to the set
+    for f in flags.keys(): t.options[f] = flags[f]
+            
+    # Generate the output
+    if dump:
+        t.dump_information()
+    else:
+        t.output = open(outputfilename, 'w')
+        t.generate_output()
+    return 0
+
+if __name__ == '__main__':
+    import doctest
+    doctest.testmod(sys.modules['__main__'])
+    doctest.testmod(parsetree)
+
+    # Someday I will use optparse, but Python 2.3 is too new at the moment.
+    yapps_options = [
+        ('context-insensitive-scanner',
+         'context-insensitive-scanner',
+         'Scan all tokens (see docs)'),
+        ]
+
+    import getopt
+    optlist, args = getopt.getopt(sys.argv[1:], 'f:', ['help', 'dump', 'use-devel-grammar'])
+    if not args or len(args) > 2:
+        print >>sys.stderr, 'Usage:'
+        print >>sys.stderr, '  python', sys.argv[0], '[flags] input.g [output.py]'
+        print >>sys.stderr, 'Flags:'
+        print >>sys.stderr, ('  --dump' + ' '*40)[:35] + 'Dump out grammar information'
+        print >>sys.stderr, ('  --use-devel-grammar' + ' '*40)[:35] + 'Use the devel grammar parser from yapps_grammar.py instead of the stable grammar from grammar.py'
+        for flag, _, doc in yapps_options:
+            print >>sys.stderr, ('  -f' + flag + ' '*40)[:35] + doc
+    else:
+        # Read in the options and create a list of flags
+        flags = {}
+        use_devel_grammar = 0
+        for opt in optlist:
+            for flag, name, _ in yapps_options:
+                if opt == ('-f', flag):
+                    flags[name] = 1
+                    break
+            else:
+                if opt == ('--dump', ''):
+                    flags['dump'] = 1
+                elif opt == ('--use-devel-grammar', ''):
+                    use_devel_grammar = 1
+                else:
+                    print >>sys.stderr, 'Warning: unrecognized option', opt[0], opt[1]
+
+        if use_devel_grammar:
+            import yapps_grammar as grammar
+        else:
+            from yapps import grammar
+            
+        sys.exit(generate(*tuple(args), **flags))