dependency pydot doesn't work on Saucy

[tfoote]

Unfortunately pydot doesn't work on Saucy.

Ticketed here upstream: https://code.google.com/p/pydot/issues/detail?id=81

Manually applying the patch from that ticket works.

Description: Support pyparsing v2
Author: grizzly.nyo@gmail.com
Origin: upstream
Bug: https://code.google.com/p/pydot/issues/detail?id=81#c9
Last-Update: 2014-03-10

---
This patch header follows DEP-3: http://dep.debian.net/deps/dep3/
--- a/dot_parser.py
+++ b/dot_parser.py
@@ -25,8 +25,9 @@ from pyparsing import __version__ as pyp
 from pyparsing import ( nestedExpr, Literal, CaselessLiteral, Word, Upcase, OneOrMore, ZeroOrMore,
     Forward, NotAny, delimitedList, oneOf, Group, Optional, Combine, alphas, nums,
     restOfLine, cStyleComment, nums, alphanums, printables, empty, quotedString,
-    ParseException, ParseResults, CharsNotIn, _noncomma, dblQuotedString, QuotedString, ParserElement )
+    ParseException, ParseResults, CharsNotIn, dblQuotedString, QuotedString, ParserElement )

+_noncomma = "".join( [ c for c in printables if c != "," ] )

 class P_AttrList:

I'm mostly putting this here so others can know the problem and workaround. I've ticketed it upstream at: https://bugs.launchpad.net/ubuntu/+source/pydot/+bug/1321135

The error will manifest itself like this:

Couldn't import dot_parser, loading of dot files will not be possible.
Traceback (most recent call last):
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_dep/ros_pack_graph.py", line 270, in _update_thread_run
    self._update_graph(self._generate_dotcode())
  File "/opt/ros/indigo/lib/python2.7/dist-packages/rqt_dep/ros_pack_graph.py", line 309, in _update_graph
    self._nodes, self._edges = self.dot_to_qt.dotcode_to_qt_items(self._current_dotcode, self._options['highlight_level'])
  File "/opt/ros/indigo/lib/python2.7/dist-packages/qt_dotgraph/dot_to_qt.py", line 238, in dotcode_to_qt_items
    graph = pydot.graph_from_dot_data(dotcode.encode("ascii", "ignore"))
  File "/usr/local/lib/python2.7/dist-packages/pydot.py", line 220, in graph_from_dot_data
    return dot_parser.parse_dot_data(data)
NameError: global name 'dot_parser' is not defined

[dirk-thomas]

Can you please verify that the patched version from branch https://github.com/ros-visualization/qt_gui_core/tree/pydot works correctly on Saucy?