core: allow user to manually end contest early (#1147)

packages/ui-default/templates/partials/contest_sidebar.html

@@ -68,6 +68,16 @@
       <li class="menu__item"><a class="menu__link" href="{{ url('contest_problemlist', tid=tdoc.docId) }}">
         <span class="icon icon-unordered_list"></span> {{ _('Problem List') }}
       </a></li>
+      {% if page_name == 'contest_detail' and tsdoc.attend and model.contest.isOngoing(tdoc, tsdoc) and tdoc.rule !== 'homework' %}
+      <li class="menu__item">
+        <form action="{{ url('contest_detail', tid=tdoc.docId) }}" method="POST" onsubmit='return confirm({{ _("Confirm end contest early? You will not be able to submit after this.")|json|safe }});'>
+          <input type="hidden" name="operation" value="early_end">
+          <button class="menu__link" type="submit">
+            <span class="icon icon-delete"></span> {{ _('End Contest Early') }}
+          </button>
+        </form>
+      </li>
+      {% endif %}
     {% endif %}{# not attend and not done #}
     {% if model.contest.canShowScoreboard.call(handler, tdoc, False) %}
       <li class="menu__item"><a class="menu__link" href="{{ url('contest_scoreboard', tid=tdoc.docId) }}">