fix: show meeting timezone when editing sessions (#5619)

* fix: show meeting timezone when editing sessions

* chore: run black on session_filters

ietf/meeting/templatetags/session_filters.py

@@ -1,17 +1,56 @@
+# Copyright The IETF Trust 2023, All Rights Reserved
 from django import template
 
+from ietf.name.models import SessionStatusName
+
 register = template.Library()
 
-@register.filter
-def presented_versions(session,doc):
-   sp = session.sessionpresentation_set.filter(document=doc)
-   if not sp:
-       return "Document not in session"
-   else:
-      rev = sp.first().rev
-      return rev if rev else "(current)"
 
 @register.filter
-def can_manage_materials(session,user):
+def presented_versions(session, doc):
+    sp = session.sessionpresentation_set.filter(document=doc)
+    if not sp:
+        return "Document not in session"
+    else:
+        rev = sp.first().rev
+        return rev if rev else "(current)"
+
+
+@register.filter
+def can_manage_materials(session, user):
     return session.can_manage_materials(user)
 
+
+@register.filter
+def describe_with_tz(session):
+    # Very similar to session.__str__, but doesn't treat interims differently from sessions at an IETF meeting
+    # and displays the timeslot in the meeting's timezone.
+
+    if session is None:
+        return ""
+
+    status_id = None
+    if hasattr(session, "current_status"):
+        status_id = session.current_status
+    elif session.pk is not None:
+        latest_event = session.schedulingevent_set.order_by("-time", "-id").first()
+        if latest_event:
+            status_id = latest_event.status_id
+
+    if status_id in ("canceled", "disappr", "notmeet", "deleted"):
+        ss0name = "(%s)" % SessionStatusName.objects.get(slug=status_id).name
+    else:
+        ss0name = "(unscheduled)"
+        ss = session.timeslotassignments.filter(
+            schedule__in=[
+                session.meeting.schedule,
+                session.meeting.schedule.base if session.meeting.schedule else None,
+            ]
+        ).order_by("timeslot__time")
+        if ss:
+            ss0name = ",".join(
+                x.timeslot.time.astimezone(session.meeting.tz()).strftime("%a-%H%M")
+                for x in ss
+            )
+            ss0name += f" {session.meeting.tz()}"
+    return f"{session.meeting}: {session.group.acronym} {session.name} {ss0name}"

ietf/templates/meeting/edit_session.html

@@ -1,15 +1,16 @@
 {% extends "base.html" %}
-{# Copyright The IETF Trust 2021, All Rights Reserved #}
+{# Copyright The IETF Trust 2023, All Rights Reserved #}
 {% load origin %}
 {% load django_bootstrap5 %}
+{% load session_filters %}
 {% block pagehead %}{{ form.media.css }}{% endblock %}
-{% block title %}Edit session "{{ session }}"{% endblock %}
+{% block title %}Edit session "{{ session|describe_with_tz }}"{% endblock %}
 {% block content %}
     {% origin %}
     <h1>
         Edit session
         <br>
-        <small class="text-muted">{{ session }}</small>
+        <small class="text-muted">{{ session|describe_with_tz }}</small>
     </h1>
     <form class="session-details-form my-3" method="post">
         {% csrf_token %}