backwards-compatible fix for python3 API changes

Author: v4hn

src/rosdoc_lite/landing_page.py

@@ -82,7 +82,12 @@ def generate_links(package, manifest, rd_configs):
     :param rd_configs: [dict] package manifest rosdoc configs
     :returns: [str] list of html snippets
     """
-    config_list = [c for c in rd_configs.itervalues() if c['builder'] != 'rosmake']
+    try:
+        rd_configs_values = rd_configs.values()
+    except AttributeError:
+        # python2 fallback
+        rd_configs_values = rd_configs.itervalues()
+    config_list = [c for c in rd_configs_values if c['builder'] != 'rosmake']
     output_dirs = [output_location(c) for c in config_list]
     # filter out empties
     output_dirs = [d for d in output_dirs if d and d != '.']

src/rosdoc_lite/msgenator.py

@@ -32,7 +32,7 @@
 
 from __future__ import print_function
 
-import cStringIO
+import io
 import os
 import sys
 import time
@@ -104,7 +104,7 @@ def _generate_raw_text(raw_text):
 
 def _generate_msg_text_from_spec(package, spec, msg_context, buff=None, indent=0):
     if buff is None:
-        buff = cStringIO.StringIO()
+        buff = io.StringIO()
     for c in spec.constants:
         buff.write("%s%s %s=%s<br />" % ("&nbsp;"*indent, c.type, c.name, c.val_text))
     for type_, name in zip(spec.types, spec.names):