Extract get_breadcrumbs_items_for_page from page_breadcrumbs template…

… tag

wagtail/admin/templatetags/wagtailadmin_tags.py

@@ -40,6 +40,7 @@
     get_valid_next_url_from_request,
 )
 from wagtail.admin.views.bulk_action.registry import bulk_action_registry
+from wagtail.admin.views.pages.utils import get_breadcrumbs_items_for_page
 from wagtail.admin.widgets import Button, ButtonWithDropdown, PageListingButton
 from wagtail.coreutils import (
     accepts_kwarg,
@@ -55,7 +56,6 @@
     Page,
     PageViewRestriction,
 )
-from wagtail.permissions import page_permission_policy
 from wagtail.telepath import JSContext
 from wagtail.users.utils import get_gravatar_url
 from wagtail.utils.deprecation import RemovedInWagtail70Warning
@@ -91,26 +91,15 @@ def page_breadcrumbs(
 ):
     user = context["request"].user
 
-    # find the closest common ancestor of the pages that this user has direct explore permission
-    # (i.e. add/edit/publish/lock) over; this will be the root of the breadcrumb
-    cca = page_permission_policy.explorable_root_instance(user)
-    if not cca:
-        return {"items": Page.objects.none()}
-
-    pages = (
-        page.get_ancestors(inclusive=include_self)
-        .descendant_of(cca, inclusive=True)
-        .specific()
+    items = get_breadcrumbs_items_for_page(
+        page,
+        user,
+        url_name,
+        url_root_name,
+        include_self,
+        querystring_value,
     )
 
-    items = []
-    for page in pages:
-        if page.is_root() and url_root_name:
-            url = reverse(url_root_name)
-        else:
-            url = reverse(url_name, args=(page.id,))
-        items.append({"url": url + querystring_value, "label": get_latest_str(page)})
-
     if trailing_breadcrumb_title:
         items.append({"label": trailing_breadcrumb_title})
 

wagtail/admin/views/pages/utils.py

@@ -1,2 +1,39 @@
+from django.urls import reverse
+
 # Retain backwards compatibility for imports
-from wagtail.admin.utils import get_valid_next_url_from_request  # noqa: F401
+from wagtail.admin.utils import (  # noqa: F401
+    get_latest_str,
+    get_valid_next_url_from_request,
+)
+from wagtail.permissions import page_permission_policy
+
+
+def get_breadcrumbs_items_for_page(
+    page,
+    user,
+    url_name="wagtailadmin_explore",
+    root_url_name="wagtailadmin_explore_root",
+    include_self=True,
+    querystring_value="",
+):
+    # find the closest common ancestor of the pages that this user has direct explore permission
+    # (i.e. add/edit/publish/lock) over; this will be the root of the breadcrumb
+    cca = page_permission_policy.explorable_root_instance(user)
+    if not cca:
+        return []
+
+    pages = (
+        page.get_ancestors(inclusive=include_self)
+        .descendant_of(cca, inclusive=True)
+        .specific()
+    )
+
+    items = []
+    for page in pages:
+        if page.is_root() and root_url_name:
+            url = reverse(root_url_name)
+        else:
+            url = reverse(url_name, args=(page.id,))
+        items.append({"url": url + querystring_value, "label": get_latest_str(page)})
+
+    return items