Add HTMX endpoint for truncating series images and corresponding result template

atlas/views.py

@@ -196,6 +196,43 @@ from helpers.cimar import CimarAPI
 logger = logging.getLogger(__name__)
 
 
+@login_required
+def series_truncate_htmx(request, series_id, start, end):
+    """HTMX endpoint to truncate a series' images to the given inclusive
+    start/end bounds (zero-based). Returns an HTML fragment with the result.
+    """
+    series = get_object_or_404(Series, pk=series_id)
+
+    if not series.check_user_can_edit(request.user):
+        return HttpResponse("<div class=\"alert alert-danger\">Permission denied</div>")
+
+    images_removed = []
+    for n, image in enumerate(series.get_images()):
+        if n >= int(start) and n <= int(end):
+            # keep images within bounds
+            continue
+        else:
+            image.removed = True
+            image.image = None
+            image.save()
+            images_removed.append(image.pk)
+
+    # Recalculate stored series size
+    try:
+        series.get_total_image_size(refresh=True)
+    except Exception:
+        # ignore errors when recalculating
+        pass
+
+    # Render a simple message fragment for HTMX swap
+    html = render_to_string(
+        "atlas/partials/truncate_result.html",
+        {"images_removed": images_removed, "series": series},
+        request=request,
+    )
+    return HttpResponse(html)
+
+
 @login_required
 def case_search_partial(request):
     """Return an HTMX partial listing cases matching the query parameter `q`.