review: Send a humbug along with review requests.

I think it might be nice to have it also specify some information
about the new review request, but I think we benefit a lot from
getting this minimal version out the door.

(imported from commit cb04c72ee125763cff2d83a6afad3f5319d8ebc6)

tools/review

@@ -298,6 +298,20 @@ def main(args):
     print >>sys.stdout
     print >>sys.stdout, msg.get_payload(decode=True),
   else:
+    sys.path.append(os.path.dirname(os.path.dirname(__file__)))
+    import api.common
+    me = get_current_user(repo)
+    api_key_file = os.path.join(os.environ["HOME"], '.humbug-api-key')
+    if not os.path.exists(api_key_file):
+      print >>sys.stderr, "You need to place your Humbug API key at %s" % (api_key_file,)
+      sys.exit(1)
+    client = api.common.HumbugAPI(email=me[me.index("<") + 1:me.index('>')],
+                                  api_key=file(api_key_file).read().strip(),
+                                  verbose=True)
+    client.send_message({'type': "personal",
+                         'recipient': ", ".join(opts.reviewers),
+                         'content': "I just sent you a review request!  Check your email for details."})
+
     if os.environ.get('REVIEW_USE_SENDMAIL', ''):
       command = ['/usr/sbin/sendmail', '-bm', '-t']
     else: