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, 9 insertions, 1 deletions

diff --git a/patchwork/templates/patchwork/patch-list.html b/patchwork/templates/patchwork/patch-list.html
index 675f67f..718949e 100644
--- a/patchwork/templates/patchwork/patch-list.html
+++ b/patchwork/templates/patchwork/patch-list.html
@@ -1,5 +1,6 @@
 {% load person %}
 {% load listurl %}
+{% load patch %}
 {% load static %}
 
 {% include "patchwork/pagination.html" %}
@@ -69,6 +70,12 @@
    </th>
 
    <th>
+    <span
+     title="{% for tag in project.tags %}{{tag.name}}{% if not forloop.last %} / {% endif %}{% endfor %}"
+     >{% for tag in project.tags %}{{tag.abbrev}}{% if not forloop.last %}/{% endif %}{% endfor %}</span>
+   </th>
+
+   <th>
     {% ifequal order.name "date" %}
      <a class="colactive"
       href="{% listurl order=order.reversed_name %}"><img
@@ -166,6 +173,7 @@
     {% endif %}
    <td><a href="{% url 'patchwork.views.patch.patch' patch_id=patch.id %}"
      >{{ patch.name|default:"[no subject]" }}</a></td>
+   <td style="white-space: nowrap;">{{ patch|patch_tags }}</td>
    <td>{{ patch.date|date:"Y-m-d" }}</td>
    <td>{{ patch.submitter|personify:project }}</td>
    <td>{{ patch.delegate.username }}</td>
@@ -259,7 +267,7 @@
 
 {% else %}
  <tr>
-  <td colspan="5">No patches to display</td>
+  <td colspan="6">No patches to display</td>
  </tr>
 {% endif %}