clear_index: adopt new behaviour of update_index

* By default, all backends are cleared
* --using may be specified multiple times

haystack/management/commands/clear_index.py

@@ -1,7 +1,7 @@
 from optparse import make_option
 import sys
+
 from django.core.management.base import BaseCommand
-from haystack.constants import DEFAULT_ALIAS
 
 
 class Command(BaseCommand):
@@ -10,35 +10,41 @@ class Command(BaseCommand):
         make_option('--noinput', action='store_false', dest='interactive', default=True,
             help='If provided, no prompts will be issued to the user and the data will be wiped out.'
         ),
-        make_option("-u", "--using", action="store", type="string", dest="using", default=DEFAULT_ALIAS,
-            help='If provided, chooses a connection to work with.'
+        make_option("-u", "--using", action="append", dest="using",
+            default=[],
+            help='Update only the named backend (can be used multiple times). '
+                 'By default all backends will be updated.'
         ),
     )
     option_list = BaseCommand.option_list + base_options
-    
+
     def handle(self, **options):
         """Clears out the search index completely."""
         from haystack import connections
         self.verbosity = int(options.get('verbosity', 1))
-        self.using = options.get('using')
-
+
+        using = options.get('using')
+        if not using:
+            using = connections.connections_info.keys()
+
         if options.get('interactive', True):
             print
-            print "WARNING: This will irreparably remove EVERYTHING from your search index in connection '%s'." % self.using
+            print "WARNING: This will irreparably remove EVERYTHING from your search index in connection '%s'." % "', '".join(using)
             print "Your choices after this are to restore from backups or rebuild via the `rebuild_index` command."
-            
+
             yes_or_no = raw_input("Are you sure you wish to continue? [y/N] ")
             print
-            
+
             if not yes_or_no.lower().startswith('y'):
                 print "No action taken."
                 sys.exit()
-        
+
         if self.verbosity >= 1:
             print "Removing all documents from your index because you said so."
-
-        backend = connections[self.using].get_backend()
-        backend.clear()
-
+
+        for backend_name in using:
+            backend = connections[backend_name].get_backend()
+            backend.clear()
+
         if self.verbosity >= 1:
             print "All documents removed."