Introduce timestamp for plan publishing and use for color coding

This mostly implements #159
Introduce a new field that denotes the timestamp when the plan was published
Introduce admin actions to publish and unpublish the plan and set that timestamp accordingly
Prevent other means to change visibility of the plan
Use that timestamp to only highlight recent changes when they occurred after the plan was already published

AKModel/admin.py

 from django import forms
 from django.apps import apps
-from django.contrib import admin
-from django.contrib.admin import SimpleListFilter, RelatedFieldListFilter
+from django.contrib import admin, messages
+from django.contrib.admin import SimpleListFilter, RelatedFieldListFilter, action
 from django.db.models import Count, F
+from django.db.models.functions import Now
 from django.shortcuts import render, redirect
 from django.urls import reverse_lazy
 from django.utils import timezone
@@ -31,11 +32,12 @@ class EventRelatedFieldListFilter(RelatedFieldListFilter):
 @admin.register(Event)
 class EventAdmin(admin.ModelAdmin):
     model = Event
-    list_display = ['name', 'status_url', 'place', 'start', 'end', 'active']
+    list_display = ['name', 'status_url', 'place', 'start', 'end', 'active', 'plan_hidden']
     list_filter = ['active']
     list_editable = ['active']
     ordering = ['-start']
-    readonly_fields = ['status_url']
+    readonly_fields = ['status_url', 'plan_hidden', 'plan_published_at']
+    actions = ['publish', 'unpublish']
 
     def add_view(self, request, form_url='', extra_context=None):
         # Always use wizard to create new events (the built-in form wouldn't work anyways since the timezone cannot
@@ -62,6 +64,16 @@ class EventAdmin(admin.ModelAdmin):
         timezone.activate(obj.timezone)
         return super().get_form(request, obj, change, **kwargs)
 
+    @action(description=_('Publish plan'))
+    def publish(self, request, queryset):
+        queryset.update(plan_published_at=Now(), plan_hidden=False)
+        self.message_user(request, _('Plan published'), messages.SUCCESS)
+
+    @action(description=_('Unpublish plan'))
+    def unpublish(self, request, queryset):
+        queryset.update(plan_published_at=None, plan_hidden=True)
+        self.message_user(request, _('Plan unpublished'), messages.SUCCESS)
+
 
 @admin.register(AKOwner)
 class AKOwnerAdmin(admin.ModelAdmin):

AKModel/forms.py

@@ -29,6 +29,7 @@ class NewEventWizardSettingsForm(forms.ModelForm):
             'start': DateTimePickerInput(options={"format": "YYYY-MM-DD HH:mm"}),
             'end': DateTimePickerInput(options={"format": "YYYY-MM-DD HH:mm"}),
             'reso_deadline': DateTimePickerInput(options={"format": "YYYY-MM-DD HH:mm"}),
+            'plan_hidden': forms.HiddenInput(),
         }
 
 

AKModel/migrations/0053_plan_published_at.py

+# Generated by Django 3.2.16 on 2022-10-15 10:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('AKModel', '0052_history_upgrade'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='event',
+            name='plan_published_at',
+            field=models.DateTimeField(blank=True, help_text='Timestamp at which the plan was published', null=True, verbose_name='Plan published at'),
+        ),
+    ]

AKModel/models.py

@@ -39,6 +39,8 @@ class Event(models.Model):
     active = models.BooleanField(verbose_name=_('Active State'), help_text=_('Marks currently active events'))
     plan_hidden = models.BooleanField(verbose_name=_('Plan Hidden'), help_text=_('Hides plan for non-staff users'),
                                       default=True)
+    plan_published_at = models.DateTimeField(verbose_name=_('Plan published at'), blank=True, null=True,
+                                         help_text=_('Timestamp at which the plan was published'))
 
     base_url = models.URLField(verbose_name=_("Base URL"), help_text=_("Prefix for wiki link construction"), blank=True)
     wiki_export_template_name = models.CharField(verbose_name=_("Wiki Export Template Name"), blank=True, max_length=50)

AKPlan/templatetags/tags_AKPlan.py

@@ -11,6 +11,11 @@ register = template.Library()
 
 @register.filter
 def highlight_change_colors(akslot):
+    # Do not highlight in preview mode or when changes occurred before the plan was published
+    if akslot.event.plan_hidden or (akslot.event.plan_published_at is not None
+                                    and akslot.event.plan_published_at > akslot.updated):
+        return akslot.ak.category.color
+
     seconds_since_update = akslot.seconds_since_last_update
 
     # Last change long ago? Use default color