[closes #56] added a button to invert thread messages order

tracim/tracim/controllers/content.py

 
     @tg.require(current_user_is_reader())
     @tg.expose('tracim.templates.thread.getone')
-    def get_one(self, thread_id):
+    def get_one(self, thread_id, inverted: str=''):
         thread_id = int(thread_id)
         user = tmpl_context.current_user
         workspace = tmpl_context.workspace
         fake_api = Context(CTX.FOLDER).toDict(fake_api_content)
 
         dictified_thread = Context(CTX.THREAD).toDict(thread, 'thread')
-        return DictLikeClass(result = dictified_thread, fake_api=fake_api)
+
+        if inverted:
+          dictified_thread.thread.history = reversed(dictified_thread.thread.history)
+
+        return DictLikeClass(result=dictified_thread, fake_api=fake_api, inverted=inverted)
 
 
 
             back_url = self._parent_url.format(item.workspace_id, item.parent_id)
             msg = _('{} not un-deleted: {}').format(self._item_type_label, str(e))
             tg.flash(msg, CST.STATUS_ERROR)
-            tg.redirect(back_url)
+            tg.redirect(back_url)

tracim/tracim/i18n/fr/LC_MESSAGES/tracim.po

 msgid "Post a reply..."
 msgstr "Poster une réponse..."
 
+#: tracim/templates/thread/getone.mak:97
+msgid "Invert order"
+msgstr "Inverser l'ordre"
+
 #: tracim/templates/thread/toolbar.mak:16
 msgid "Edit current thread"
 msgstr "Modifier le sujet de discussion"

tracim/tracim/public/assets/css/dashboard.css

 .no-padding {
     padding: 0px;
 }
+.threads-history-reverse {
+  float: right;
+  padding: 10px 15px 0 0;
+  font-size: 16px;
+}
+.threads-history-reverse > i {
+  font-size: 12px;
+}

tracim/tracim/templates/thread/getone.mak

 
 <div class="row">
     <div class="col-sm-7 col-sm-offset-3">
+        <div class="threads-history-reverse">
+        % if inverted:
+            <a href="${tg.url('/workspaces/{}/folders/{}/threads/{}'.format(result.thread.workspace.id, result.thread.parent.id, result.thread.id))}">
+                <i class="fa fa-chevron-down" aria-hidden="true"></i>
+        % else:
+            <a href="${tg.url('/workspaces/{}/folders/{}/threads/{}?inverted=1'.format(result.thread.workspace.id, result.thread.parent.id, result.thread.id))}">
+                <i class="fa fa-chevron-up" aria-hidden="true"></i>
+        % endif
+                ${_('Invert order')}
+            </a>
+        </div>
         % if h.user_role(fake_api.current_user, result.thread.workspace)<=1:
             ## READONLY USER
             <% a = 'b' %>
     </div>
 </div>
 
+<!-- % for event in reversed(result.thread.history): -->
 % for event in result.thread.history:
     ## TODO - D.A. - 2015-08-20
     ## Allow to show full history (with status change and archive/unarchive)