@@ -1446,9 +1446,9 @@ class DotWidget(gtk.DrawingArea):

     def set_filter(self, filter):

         self.filter = filter

-    def set_dotcode(self, dotcode, filename='<stdin>'):

-        if isinstance(dotcode, unicode):

-            dotcode = dotcode.encode('utf8')

+    def run_filter(self, dotcode):

+        if not self.filter:

+            return dotcode

         p = subprocess.Popen(

             [self.filter, '-Txdot'],

             stdin=subprocess.PIPE,

@@ -1466,6 +1466,14 @@ class DotWidget(gtk.DrawingArea):

             dialog.set_title('Dot Viewer')

             dialog.run()

             dialog.destroy()

+            return None

+        return xdotcode

+

+    def set_dotcode(self, dotcode, filename='<stdin>'):

+        if isinstance(dotcode, unicode):

+            dotcode = dotcode.encode('utf8')

+        xdotcode = self.run_filter(dotcode)

+        if xdotcode is None:

             return False

         try:

             self.set_xdotcode(xdotcode)

@@ -1872,6 +1880,10 @@ def main():

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

         dest='filter', default='dot',

         help='graphviz filter: dot, neato, twopi, circo, or fdp [default: %default]')

+    parser.add_option(

+        '-n', '--no-filter',

+        action='store_const', const=None, dest='filter',

+        help='assume input is already filtered into xdot format (use e.g. dot -Txdot)')

     (options, args) = parser.parse_args(sys.argv[1:])

     if len(args) > 1: