Add option to print task IDs to qinfo

Option to print IDs (PIDs) of running clusters added to qinfo.
This provides an easy way for scripts and process managers to fetch the PID(s) of running clusters.

django_q/management/commands/qinfo.py

@@ -6,7 +6,7 @@ from django.utils.translation import ugettext as _
 
 from django_q import VERSION
 from django_q.conf import Conf
-from django_q.monitor import info
+from django_q.monitor import info, get_ids
 
 
 class Command(BaseCommand):
@@ -19,10 +19,17 @@ class Command(BaseCommand):
                     dest='config',
                     default=False,
                     help='Print current configuration.'),
+        make_option('--ids',
+                    action='store_true',
+                    dest='ids',
+                    default=False,
+                    help='Print cluster task IDs (PIDs).'),
     )
 
     def handle(self, *args, **options):
-        if options.get('config', False):
+        if options.get('ids', True):
+            get_ids()
+        elif options.get('config', False):
             hide = ['conf', 'IDLE', 'STOPPING', 'STARTING', 'WORKING', 'SIGNAL_NAMES', 'STOPPED']
             settings = [a for a in dir(Conf) if not a.startswith('__') and a not in hide]
             self.stdout.write('VERSION: {}'.format('.'.join(str(v) for v in VERSION)))

django_q/monitor.py

@@ -187,3 +187,14 @@ def info(broker=None):
           term.white('{0:.4f}'.format(exec_time))
           )
     return True
+
+
+def get_ids():
+    # prints id (PID) of running clusters
+    stat = Stat.get_all()
+    if stat:
+        for s in stat:
+            print(s.cluster_id)
+    else:
+        print('No clusters appear to be running.')
+    return True