Add page count and links to bottom of board view

Current page shows up on the bottom of every board with next/prev links
where applicable.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/static/board/style.css

@@ -19,6 +19,13 @@ hr {
     font-size: small;
 }
 
+/* Pagination */
+.pagination {
+    margin: auto;
+    width: 50%;
+    text-align: center;
+}
+
 /* Posts */
 /*.post_body { }*/
 .post_image_info {

board/templates/board/board_detail.html

@@ -63,4 +63,22 @@
 <hr />
 {% endfor %}
 
+{# Page footer #}
+<div class="row pagination">
+    {% if current_page > 1 %}
+    <a href="/{{board.url}}/page/{{ current_page|add:"-1" }}">{% localize on %}Prev{% endlocalize %}</a>
+    {% endif %}
+    [
+        {% for page in pages %}
+            {% if current_page == page %}
+            <strong>{{page}}</strong>
+            {% else %}
+            <a href="page/{{page}}">{{page}}</a>
+            {% endif %}
+        {% endfor %}
+    ]
+    {% if current_page < last_page %}
+    <a href="/{{board.url}}/page/{{ current_page|add:"1" }}">{% localize on %}Next{% endlocalize %}</a>
+    {% endif %}
+</div>
 {% endblock content %}

board/views.py

@@ -55,17 +55,24 @@ class BoardView(CreatePostView):
     template_name = "board/board_detail.html"
 
     def get_context_data(self, **kwargs):
-        kwargs["board"] = self.board
         page = self.kwargs.get("page", 1)
 
         if page not in range(1, self.board.max_pages + 1):
             raise Http404()
 
-        start = (page - 1) * self.board.threads_per_page
-        end = start + self.board.threads_per_page
+        threads_per_page = self.board.threads_per_page
+        start = (page - 1) * threads_per_page
+        end = start + threads_per_page
+        thread_count = self.board.threads.count()
+        last_page = (thread_count // threads_per_page) + 1
+
+        kwargs["board"] = self.board
         kwargs["threads"] = self.board.threads.order_by("-last_bump")[start:end]
-        kwargs["page"] = page
+        kwargs["current_page"] = page
+        kwargs["pages"] = range(1, last_page + 1)
+        kwargs["last_page"] = last_page
         kwargs["max_upload_size"] = settings.MAX_UPLOAD_SIZE
+
         return super(BoardView, self).get_context_data(**kwargs)