Update OPDS-part to display publishers

cps/templates/feed.xml

@@ -43,6 +43,9 @@
     <author>
       <name>{{entry.authors[0].name}}</name>
     </author>
+    <publisher>
+      <name>{{entry.publishers[0].name}}</name>
+    </publisher>
     <dcterms:language>{{entry.language}}</dcterms:language>
     {% for tag in entry.tags %}
     <category scheme="http://www.bisg.org/standards/bisac_subject/index.html"

cps/templates/index.xml

@@ -62,6 +62,13 @@
     <updated>{{ current_time }}</updated>
     <content type="text">{{_('Books ordered by Author')}}</content>
   </entry>
+  <entry>
+    <title>{{_('Publishers')}}</title>
+    <link rel="subsection" href="{{url_for('feed_publisherindex')}}" type="application/atom+xml;profile=opds-catalog"/>
+    <id>{{url_for('feed_publisherindex')}}</id>
+    <updated>{{ current_time }}</updated>
+    <content type="text">{{_('Books ordered by publisher')}}</content>
+  </entry>
   <entry>
     <title>{{_('Category list')}}</title>
     <link rel="subsection" href="{{url_for('feed_categoryindex')}}" type="application/atom+xml;profile=opds-catalog"/>

cps/web.py

@@ -752,6 +752,26 @@ def feed_author(book_id):
     return render_xml_template('feed.xml', entries=entries, pagination=pagination)
 
 
+@app.route("/opds/publisher")
+@requires_basic_auth_if_no_ano
+def feed_publisherindex():
+    off = request.args.get("offset") or 0
+    entries = db.session.query(db.Publishers).join(db.books_publishers_link).join(db.Books).filter(common_filters())\
+        .group_by('books_publishers_link.publisher').order_by(db.Publishers.sort).limit(config.config_books_per_page).offset(off)
+    pagination = Pagination((int(off) / (int(config.config_books_per_page)) + 1), config.config_books_per_page,
+                            len(db.session.query(db.Publishers).all()))
+    return render_xml_template('feed.xml', listelements=entries, folder='feed_publisher', pagination=pagination)
+
+
+@app.route("/opds/publisher/<int:book_id>")
+@requires_basic_auth_if_no_ano
+def feed_publisher(book_id):
+    off = request.args.get("offset") or 0
+    entries, __, pagination = fill_indexpage((int(off) / (int(config.config_books_per_page)) + 1),
+                                             db.Books, db.Books.publishers.any(db.Publishers.id == book_id), [db.Books.timestamp.desc()])
+    return render_xml_template('feed.xml', entries=entries, pagination=pagination)
+
+
 @app.route("/opds/category")
 @requires_basic_auth_if_no_ano
 def feed_categoryindex():