Adding a general purpose context hook for the media display page.

Since the media template name gets swapped out for each media
type, normal context hooks don't work if you want to affect all
media displays.  This gives a general purpose hook.

This commit sponsored by Kẏra.  Thanks! :)

mediagoblin/user_pages/views.py

@@ -31,6 +31,7 @@ from mediagoblin.user_pages.lib import (send_comment_email,
 	add_media_to_collection, build_report_object)
 from mediagoblin.notifications import trigger_notification, \
     add_comment_subscription, mark_comment_notification_seen
+from mediagoblin.tools.pluginapi import hook_transform
 
 from mediagoblin.decorators import (uses_pagination, get_user_media_entry,
     get_media_entry_by_id, user_has_privilege, user_not_banned,
@@ -146,14 +147,23 @@ def media_home(request, media, page, **kwargs):
 
     media_template_name = media.media_manager.display_template
 
-    return render_to_response(
-        request,
-        media_template_name,
-        {'media': media,
+    context = {
+        'media': media,
         'comments': comments,
         'pagination': pagination,
         'comment_form': comment_form,
-         'app_config': mg_globals.app_config})
+        'app_config': mg_globals.app_config}
+
+    # Since the media template name gets swapped out for each media
+    # type, normal context hooks don't work if you want to affect all
+    # media displays.  This gives a general purpose hook.
+    context = hook_transform(
+        "media_home_context", context)
+
+    return render_to_response(
+        request,
+        media_template_name,
+        context)
 
 
 @get_media_entry_by_id