fix: clearly show To and From groups in liaison statement email

ietf/group/templatetags/group_filters.py

@@ -37,3 +37,10 @@ def role_person_link(role, **kwargs):
     plain_name = role.person.plain_name()
     email = role.email.address
     return {'name': name, 'plain_name': plain_name, 'email': email, 'title': title, 'class': cls}
+
+@register.filter
+def name_with_conditional_acronym(group):
+    if group.type_id in ("sdo", "isoc", "individ", "nomcom", "ietf", "irtf", ):
+        return group.name
+    else:
+        return f"{group.name} ({group.acronym})"

ietf/templates/liaisons/liaison_mail.txt

@@ -1,13 +1,20 @@
-{% load ietf_filters %}{% autoescape off %}Title: {{ liaison.title|clean_whitespace }}
+{% load ietf_filters group_filters %}{% autoescape off %}Title: {{ liaison.title|clean_whitespace }}
 Submission Date: {{ liaison.submitted|date:"Y-m-d" }}
 URL of the IETF Web page: {{ liaison.get_absolute_url }}
+
+To: {% for g in liaison.to_groups.all %}{{g|name_with_conditional_acronym}}{% if not forloop.last %}, {% endif %}{% endfor %}
+From: {% for g in liaison.from_groups.all %}{{g|name_with_conditional_acronym}}{% if not forloop.last %}, {% endif %}{% endfor %}
+Purpose: {{ liaison.purpose.name }}
 {% if liaison.deadline %}Please reply by {{ liaison.deadline }}{% endif %}
+
+Email Addresses
+---------------
 From: {% if liaison.from_contact %}{{ liaison.from_contact }}{% endif %}
 To: {{ liaison.to_contacts }}
 Cc: {{ liaison.cc_contacts }}
 Response Contacts: {{ liaison.response_contacts }}
 Technical Contacts: {{ liaison.technical_contacts }}
-Purpose: {{ liaison.purpose.name }}
+
 {% for related in liaison.source_of_set.all %}
 Referenced liaison: {% if related.target.title %}{{ related.target.title }}{% else %}Liaison #{{ related.target.pk }}{% endif %} ({{ related.target.get_absolute_url }})
 {% endfor %}