tweaks to GitHub stats script

- unicode / py3 fixes
- don't build GitHub links unless `--links` is given
  (link to milestone page, instead)

tools/github_stats.py

@@ -95,9 +95,7 b" def sorted_by_field(issues, field='closed_at', reverse=False):"
 
 
 def report(issues, show_urls=False):
-    """Summary report about a list of issues, printing number and title.
-    """
-    # titles may have unicode in them, so we must encode everything below
+    """Summary report about a list of issues, printing number and title."""
     if show_urls:
         for i in issues:
             role = 'ghpull' if 'merged_at' in i else 'ghissue'
@@ -113,6 +111,7 b' def report(issues, show_urls=False):'
 
 if __name__ == "__main__":
     # deal with unicode
+    if sys.version_info < (3,):
     sys.stdout = codecs.getwriter('utf8')(sys.stdout)
     
     # Whether to add reST urls for all issues in printout.
@@ -131,6 +130,9 b' if __name__ == "__main__":'
     parser.add_argument('--project', type=str, default="ipython/ipython",
         help="The project to summarize."
     )
+    parser.add_argument('--links', action='store_true', default=False,
+        help="Include links to all closed Issues and PRs in the output."
+    )
     
     opts = parser.parse_args()
     tag = opts.since_tag
@@ -140,9 +142,9 b' if __name__ == "__main__":'
         since = datetime.utcnow() - timedelta(days=opts.days)
     else:
         if not tag:
-            tag = check_output(['git', 'describe', '--abbrev=0']).strip()
+            tag = check_output(['git', 'describe', '--abbrev=0']).strip().decode('utf8')
         cmd = ['git', 'log', '-1', '--format=%ai', tag]
-        tagday, tz = check_output(cmd).strip().rsplit(' ', 1)
+        tagday, tz = check_output(cmd).strip().decode('utf8').rsplit(' ', 1)
         since = datetime.strptime(tagday, "%Y-%m-%d %H:%M:%S")
         h = int(tz[1:3])
         m = int(tz[3:])
@@ -208,14 +210,20 b' if __name__ == "__main__":'
     all_authors.extend([ u'* ' + a.split(' <')[0] for a in with_email ])
     unique_authors = sorted(set(all_authors), key=lambda s: s.lower())
 
+    print("We closed %d issues and merged %d pull requests." % (n_pulls, n_issues))
+    if milestone:
+        print("The full list can be seen `on GitHub <https://github.com/%s/milestone/%s>`"
+            % (project, milestone)
+        )
+    
+    print()
     print("The following %i authors contributed %i commits." % (len(unique_authors), ncommits))
     print()
     print('\n'.join(unique_authors))
     
+    if opts.links:
     print()
-    print("We closed %d issues and merged %d pull requests;\n"
-          "this is the full list (generated with the script \n"
-          ":file:`tools/github_stats.py`):" % (n_pulls, n_issues))
+        print("GitHub issues and pull requests:")
     print()
     print('Pull Requests (%d):\n' % n_pulls)
     report(pulls, show_urls)