@@ -28,6 +28,7 @@ import math

 import colorsys

 import time

 import re

+import optparse

 import gobject

 import gtk

@@ -2017,11 +2018,32 @@ class DotWindow(gtk.Window):

         self.widget.reload()

+class OptionParser(optparse.OptionParser):

+

+    def format_epilog(self, formatter):

+        # Prevent stripping the newlines in epilog message

+        # http://stackoverflow.com/questions/1857346/python-optparse-how-to-include-additional-info-in-usage-output

+        return self.epilog

+

+

 def main():

-    import optparse

-    parser = optparse.OptionParser(

-        usage='\n\t%prog [file]')

+    parser = OptionParser(

+        usage='\n\t%prog [file]',

+        epilog='''

+Shortcuts:

+  Up, Down, Left, Right     scroll

+  PageUp, +, =              zoom in

+  PageDown, -               zoom out

+  R                         reload dot file

+  F                         find

+  Q                         quit

+  P                         print

+  Escape                    halt animation

+  Ctrl-drag                 zoom in/out

+  Shift-drag                zooms an area

+'''

+    )

     parser.add_option(

         '-f', '--filter',

         type='choice', choices=('dot', 'neato', 'twopi', 'circo', 'fdp'),