Make it possible to override session's start/end time

Resolves #325.

Author: torsava

naucse/models.py

@@ -354,14 +354,30 @@ def _time(self, time):
             return datetime.datetime.combine(self.date, time)
         return None
 
+    def _session_time(self, key):
+        sesion_time = self.info.get('time')
+        if sesion_time:
+            return time_from_string(sesion_time[key])
+        return None
+
+    @reify
+    def has_custom_time(self):
+        return self._session_time('start') is not None
+
     @reify
     def start_time(self):
+        session_time = self._session_time('start')
+        if session_time:
+            return self._time(session_time)
         if self.course:
             return self._time(self.course.default_start_time)
         return None
 
     @reify
     def end_time(self):
+        session_time = self._session_time('end')
+        if session_time:
+            return self._time(session_time)
         if self.course:
             return self._time(self.course.default_end_time)
         return None

naucse/templates/course.html

@@ -39,9 +39,16 @@ <h4>
                             {{ session.title }}
                         </a>
                         {% if session.date %}
-                            <small>({{ session.date | format_date }})</small>
+                            <small>({{ session.date | format_date -}}
+                                {%- if session.has_custom_time -%}
+                                , {{ session.start_time | format_time }}–{{ session.end_time | format_time -}}
+                                {% endif -%}
+                                )</small>
                         {% endif %}
                     </h4>
+                    {% if session.has_custom_time %}
+                        <div>{{ bytesize_icon('alert') }} Pozor, změna času!</div>
+                    {% endif %}
                     {% if session.description %}{{ session.description | markdown }}{% endif %}
                     {{ material_list(session.materials) }}
                 </div>

naucse/templates/coverpage.html

@@ -25,8 +25,9 @@ <h1>
             {% endif %}
         </h1>
 
-        {% if course.place is defined and course.time is defined and course.place != None and course.time != None %}
-            <div class="details">{{course.place}}, {{course.time}}</div>
+        {% if course.place is not none and session.start_time is not none %}
+            <div class="details">{{ course.place }},
+                {{ session.start_time | format_time }}–{{ session.end_time | format_time }}</div>
         {% endif %}
 
         {% if session.description %}{{ session.description | markdown }}{% endif %}