collections: add support to browse existing collections

- add a route at /u/<user>/collections/ (note trailing 's') that lists
  all existing collections
- move there the "Create new collection" link, if the user is logged in
- add a new link "Browse collections" from root.html

mediagoblin/templates/mediagoblin/root.html

@@ -27,9 +27,10 @@
         <li><a href="{{ request.urlgen('mediagoblin.submit.start') }}">
           {%- trans %}Add media{% endtrans -%}
         </a></li>
-        <li><a href="{{ request.urlgen('mediagoblin.submit.collection') }}">
+        <li><a href="{{ request.urlgen('mediagoblin.user_pages.user_collections',
-          {%- trans %}Create new collection{% endtrans -%}
+                                      user=request.user.username) }}">
-        </a></li>
+            {%- trans %}Browse collections{% endtrans -%}
+	</a></li>
         <li><a href="{{ request.urlgen('mediagoblin.edit.account') }}">
           {%- trans %}Change account settings{% endtrans -%}
         </a></li>

mediagoblin/templates/mediagoblin/user_pages/collections.html

@@ -0,0 +1,63 @@
+{#
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011, 2012 MediaGoblin contributors.  See AUTHORS.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#}
+{% extends "mediagoblin/base.html" %}
+
+{% block mediagoblin_head %}
+    <link rel="alternate" type="application/atom+xml"
+          href="{{ request.urlgen(
+                       'mediagoblin.user_pages.atom_feed',
+                       user=user.username) }}">
+{% endblock mediagoblin_head %}
+
+{% block title %}
+  {%- trans username=user.username -%}
+    {{ username }}'s collections
+  {%- endtrans %} &mdash; {{ super() }}
+{% endblock %}
+
+{% block mediagoblin_content -%}
+  <h1>
+    {%- trans username=user.username,
+              user_url=request.urlgen(
+                         'mediagoblin.user_pages.user_home',
+                          user=user.username) -%}
+      <a href="{{ user_url }}">{{ username }}</a>'s collections
+    {%- endtrans %}
+  </h1>
+
+  {% if request.user %}
+    {% if request.user.status == 'active' %}
+      <p>
+        <a href="{{ request.urlgen('mediagoblin.submit.collection',
+                                            user=user.username) }}">
+          {%- trans %}Create new collection{% endtrans -%}
+      </p>
+    {% endif %}
+  {% endif %}
+
+  <ul>
+    {% for coll in collections %}
+      {% set coll_url = request.urlgen(
+                          'mediagoblin.user_pages.user_collection',
+                          user=user.username,
+                          collection=coll.slug) %}
+      <li><a href="{{ coll_url }}">{{ coll.title }}</li>
+    {% endfor %}
+  </ul>
+
+{% endblock %}

mediagoblin/user_pages/routing.py

@@ -48,6 +48,10 @@ add_route('mediagoblin.user_pages.media_collect',
           '/u/<string:user>/m/<string:media>/collect/',
           'mediagoblin.user_pages.views:media_collect')
 
+add_route('mediagoblin.user_pages.user_collections',
+          '/u/<string:user>/collections/',
+          'mediagoblin.user_pages.views:user_collections')
+
 add_route('mediagoblin.user_pages.user_collection',
           '/u/<string:user>/collection/<string:collection>/',
           'mediagoblin.user_pages.views:user_collection')

mediagoblin/user_pages/views.py

@@ -337,6 +337,23 @@ def user_collection(request, page, url_user=None):
          'pagination': pagination})
 
 
+@active_user_from_url
+@uses_pagination
+def user_collections(request, page, url_user=None):
+    """A User-defined Collection"""
+    collections = Collection.query.filter_by(
+        get_creator=url_user)
+
+    pagination = Pagination(page, collections)
+
+    return render_to_response(
+        request,
+        'mediagoblin/user_pages/collections.html',
+        {'user': url_user,
+         'collections': collections,
+         'pagination': pagination})
+
+
 @get_user_collection_item
 @require_active_login
 @user_may_alter_collection