feeds: add per arch, per repo feed ability

Make the feed framework a lot more flexible and give the possibility to have
a feed for each architecture. You can drill down even more than also get a
feed for a particular repo; some might find this helpful for something like
tracking [testing]. Implements FS#12939.

I also bumped up the number of items available in each of these feeds; since
it is full of a bunch of small items it might be more helpful to have more
available and it should also prevent fewer ones from being missed.

The UI isn't exactly spectacular, but I figured some sort of page is better
than none listing all the various feeds you can pull from.

Signed-off-by: Dan McGee <dan@archlinux.org>

feeds.py

@@ -1,14 +1,55 @@
 import datetime
-from django.contrib.syndication.feeds import Feed
-from archweb.main.models import Package, News
+
+from django.contrib.syndication.feeds import Feed, FeedDoesNotExist
+from django.db.models import Q
+from archweb.main.models import Arch, Repo, Package, News
 
 class PackageFeed(Feed):
-    title       = 'Arch Linux Recent Package Updates'
-    link       = '/packages/'
-    description = 'Recently updated packages in the Arch Linux package repositories.'
+    def get_object(self, bits):
+        # just cut the BS early
+        if len(bits) > 2:
+            raise FeedDoesNotExist
 
-    def items(self):
-        return Package.objects.select_related('arch', 'repo').order_by('-last_update')[:24]
+        obj = dict()
+        qs = Package.objects.select_related('arch', 'repo').order_by('-last_update')
+
+        if len(bits) > 0:
+            # feed for a single arch, also include 'any' packages everywhere
+            a = Arch.objects.get(name=bits[0])
+            qs = qs.filter(Q(arch=a) | Q(arch__name__iexact='any'))
+            obj['arch'] = a
+        if len(bits) > 1:
+            # feed for a single arch AND repo
+            r = Repo.objects.get(name=bits[1])
+            qs = qs.filter(repo=r)
+            obj['repo'] = r
+        obj['qs'] = qs[:50]
+        return obj
+
+    def title(self, obj):
+        s = 'Arch Linux: Recent package updates'
+        if 'repo' in obj:
+            s += ' (%s [%s])' % (obj['arch'].name, obj['repo'].name.lower())
+        elif 'arch' in obj:
+            s += ' (%s)' % (obj['arch'].name)
+        return s
+
+    def link(self, obj):
+        return '/packages/'
+
+    def description(self, obj):
+        s = 'Recently updated packages in the Arch Linux package repositories'
+        if 'arch' in obj:
+            s += ' for the \'%s\' architecture' % obj['arch'].name.lower()
+            if obj['arch'].name != 'any':
+                s += ' (including \'any\' packages)'
+        if 'repo' in obj:
+            s += ' in the [%s] repository' % obj['repo'].name.lower()
+        s += '.'
+        return s
+
+    def items(self, obj):
+        return obj['qs']
 
     def item_pubdate(self, item):
         return item.last_update
@@ -16,9 +57,10 @@ def item_pubdate(self, item):
     def item_categories(self, item):
         return (item.repo.name,item.arch.name)
 
+
 class NewsFeed(Feed):
-    title       = 'Arch Linux Recent News Updates'
-    link       = '/news/'
+    title = 'Arch Linux: Recent news updates'
+    link = '/news/'
     description = 'The latest and greatest news from the Arch Linux distribution.'
 
     def items(self):

public/views.py

@@ -72,5 +72,12 @@ def moreforums(request):
             template_name="public/moreforums.html",
             template_object_name="forum")
 
+def feeds(request):
+    context = {
+        'arches': Arch.objects.all(),
+        'repos': Repo.objects.all(),
+    }
+    return render_to_response('public/feeds.html', context)
+
 # vim: set ts=4 sw=4 et:
 

templates/public/feeds.html

@@ -0,0 +1,27 @@
+{% extends "base.html" %}
+{% block title %}Arch Linux - RSS Feeds{% endblock %}
+{% block content %}
+<div class="box">
+    <h2 class="title">RSS Feeds</h2>
+    <br /><br />
+    <p>Several RSS feeds are available for consumption from the Arch website.
+    The majority of these are package related and allow feeds to be customized
+    for the updates you care about.</p>
+    <table cellspacing="20">
+        <tr><td>News items feed</td>
+            <td><a href="/feeds/news/">Feed <img src="/media/rss.png" alt="RSS Feed" /></a></td></tr>
+		<tr><td>Packages feed for <em>all</em> architectures, <em>all</em> repositories</td>
+            <td><a href="/feeds/packages/">Feed <img src="/media/rss.png" alt="RSS Feed" /></a></td></tr>
+        {% for arch in arches %}
+		<tr><td>Packages feed for architecture {{ arch }}, <em>all</em> repositories</td>
+            <td><a href="/feeds/packages/{{ arch }}/">Feed <img src="/media/rss.png" alt="RSS Feed" /></a></td></tr>
+        {% for repo in repos %}
+        <tr><td>Packages feed for architecture {{ arch }}, repository {{ repo }}</td>
+            <td><a href="/feeds/packages/{{ arch }}/{{ repo }}/">Feed <img src="/media/rss.png" alt="RSS Feed" /></a></td></tr>
+        {% endfor %}
+        {% endfor %}
+    </table>
+</div>
+<br /><br />
+{% endblock %}
+

templates/public/index.html

@@ -64,7 +64,8 @@ <h4 class="news"><a href="{{ news.get_absolute_url }}">{{ news.title }}</a></h4>
             </tr>
         {% endfor %}
             <tr>
-                <td colspan="2" style="text-align:right;font-size:x-small"><br /><a href="/packages/?sort=-last_update">More...</a></td>
+                <td style="font-size:x-small"><br /><a href="/feeds/">More Feeds...</a></td>
+                <td style="text-align:right;font-size:x-small"><br /><a href="/packages/?sort=-last_update">More Updates...</a></td>
             </tr>
         </table>
     </div>

urls.py

@@ -78,6 +78,7 @@
     (r'^devel/newuser/$', 'archweb.devel.views.new_user_form'),
 
 # Feeds and sitemaps
+    (r'^feeds/$', 'archweb.public.views.feeds'),
     (r'^feeds/(?P<url>.*)/$',
         'django.contrib.syndication.views.feed', {'feed_dict': feeds}),
     (r'^sitemap.xml$', 'django.contrib.sitemaps.views.sitemap',