Add patch tag infrastructure

This change add patch 'tags', eg 'Acked-by' / 'Reviewed-by', etc., to
patchwork.

Tag parsing is implemented in the patch parser's extract_tags function,
which returns a Counter object of the tags in a comment. These are
stored in the PatchTag (keyed to Tag) objects associated with each
patch.

We need to ensure that the main patch lists do not cause per-patch
queries on the Patch.tags ManyToManyField (this would result in ~500
queries per page), so we introduce a new QuerySet (and Manager) for
Patch, adding a with_tag_counts() method to populate the tag counts in a
single query.

As users may be migrating from previous patchwork versions (ie, with no
tag counts in the database), we add a 'retag' management command.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

1 files changed, 13 insertions, 0 deletions

diff --git a/patchwork/templatetags/patch.py b/patchwork/templatetags/patch.py
index bec0cab..ea23ebd 100644
--- a/patchwork/templatetags/patch.py
+++ b/patchwork/templatetags/patch.py
@@ -18,6 +18,7 @@
 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
 from django import template
+from django.utils.safestring import mark_safe
 import re
 
 register = template.Library()
@@ -63,3 +64,15 @@ class EditablePatchNode(template.Node):
             return self.nodelist_false.render(context)
 
         return self.nodelist_true.render(context)
+
+@register.filter(name='patch_tags')
+def patch_tags(patch):
+    counts = []
+    titles = []
+    for tag in patch.project.tags:
+        count = getattr(patch, tag.attr_name)
+        titles.append('%d %s' % (count, tag.name))
+        counts.append(str(count))
+    return mark_safe('<span title="%s">%s</span>' % (
+            ' / '.join(titles),
+            ' '.join(counts)))