Show count of facet values if ?_facet_size=max, closes #1423

datasette/static/app.css

@@ -633,6 +633,11 @@ form button[type=button] {
     width: 250px;
     margin-right: 15px;
 }
+.facet-info-total {
+    font-size: 0.8em;
+    color: #666;
+    padding-right: 0.25em;
+}
 .facet-info li,
 .facet-info ul {
     margin: 0;

datasette/templates/table.html

@@ -156,7 +156,9 @@
         {% for facet_info in sorted_facet_results %}
             <div class="facet-info facet-{{ database|to_css_class }}-{{ table|to_css_class }}-{{ facet_info.name|to_css_class }}" id="facet-{{ facet_info.name|to_css_class }}">
                 <p class="facet-info-name">
-                    <strong>{{ facet_info.name }}{% if facet_info.type != "column" %} ({{ facet_info.type }}){% endif %}</strong>
+                    <strong>{{ facet_info.name }}{% if facet_info.type != "column" %} ({{ facet_info.type }}){% endif %}
+                        {% if show_facet_counts %} <span class="facet-info-total">{% if facet_info.truncated %}&gt;{% endif %}{{ facet_info.results|length }}</span>{% endif %}
+                    </strong>
                     {% if facet_info.hideable %}
                         <a href="{{ facet_info.toggle_url }}" class="cross">&#x2716;</a>
                     {% endif %}

datasette/views/table.py

@@ -928,6 +928,7 @@ class TableView(RowTableShared):
                     key=lambda f: (len(f["results"]), f["name"]),
                     reverse=True,
                 ),
+                "show_facet_counts": special_args.get("_facet_size") == "max",
                 "extra_wheres_for_ui": extra_wheres_for_ui,
                 "form_hidden_args": form_hidden_args,
                 "is_sortable": any(c["sortable"] for c in display_columns),

tests/test_html.py

@@ -479,7 +479,7 @@ def test_facet_display(app_client):
     for div in divs:
         actual.append(
             {
-                "name": div.find("strong").text,
+                "name": div.find("strong").text.split()[0],
                 "items": [
                     {
                         "name": a.text,
@@ -1797,3 +1797,23 @@ def test_column_metadata(app_client):
         soup.select("th[data-column=address]")[0]["data-column-description"]
         == "The street address for the attraction"
     )
+
+
+@pytest.mark.parametrize("use_facet_size_max", (True, False))
+def test_facet_total_shown_if_facet_max_size(use_facet_size_max):
+    # https://github.com/simonw/datasette/issues/1423
+    with make_app_client(settings={"max_returned_rows": 100}) as client:
+        path = "/fixtures/sortable?_facet=content&_facet=pk1"
+        if use_facet_size_max:
+            path += "&_facet_size=max"
+        response = client.get(path)
+        assert response.status == 200
+    fragments = (
+        '<span class="facet-info-total">&gt;100</span>',
+        '<span class="facet-info-total">8</span>',
+    )
+    for fragment in fragments:
+        if use_facet_size_max:
+            assert fragment in response.text
+        else:
+            assert fragment not in response.text