milestone-review-dash detect current milestone

This patch makes the milestone arg optional. If it's not passed
the script will detect and use the current milestone.
This is required to run this script in a periodic job, since infra
won't accept hard-code parameters.

Change-Id: I8c2ffbc68fd36759924e9ab2a1eb64be390d4756

tools/milestone-review-dash.py

@@ -28,6 +28,20 @@ def is_milestone_valid(project, name):
     return False
 
 
+def get_current_milestone(project):
+    series = project.get_timeline()['entries']
+    current_milestone = ""
+    for s in series:
+        if s['is_development_focus']:
+            for landmark in s['landmarks']:
+                #landmark with a date set are past milestones
+                if not landmark['date']:
+                    if (landmark['name'] < current_milestone or
+                        not current_milestone):
+                        current_milestone = landmark['name']
+    return current_milestone
+
+
 def _search_task(project, **kwargs):
     bugs = project.searchTasks(**kwargs)
     if not bugs:
@@ -105,23 +119,28 @@ parser = argparse.ArgumentParser(
                 ' folder that you can serve as input for gerrit-dash-creator.'
                 ' The output of the script can be used to query Gerrit'
                 ' directly.')
-parser.add_argument('milestone', type=str, help='The release milestone')
+parser.add_argument('-m', '--milestone', type=str,
+                    help='The release milestone')
 parser.add_argument('-o', '--output', type=str, help='Output file')
 
-args = parser.parse_args()
-milestone = args.milestone
-if args.output:
-    file_name = args.output
-else:
-    file_name = milestone + '.dash'
-
 cachedir = "~/.launchpadlib/cache/"
 launchpad = Launchpad.login_anonymously('just testing', 'production', cachedir,
                                         version="devel")
 neutron = launchpad.projects['neutron']
 neutron_client = launchpad.projects['python-neutronclient']
-if not is_milestone_valid(neutron, milestone):
-    sys.exit()
+
+args = parser.parse_args()
+if args.milestone:
+    milestone = args.milestone
+    if not is_milestone_valid(neutron, milestone):
+        sys.exit()
+else:
+    milestone = get_current_milestone(neutron)
+if args.output:
+    file_name = args.output
+else:
+    file_name = milestone + '.dash'
+
 
 with open(file_name, 'w') as f:
     title = "[dashboard]\ntitle = Neutron %s Review Inbox\n" % milestone