feat(faq): can add dsfr alert from markdown

app/lib/redcarpet/trusted_renderer.rb

@@ -37,5 +37,20 @@ module Redcarpet
     def image(link, title, alt)
       view_context.image_tag(link, title:, alt:, loading: :lazy)
     end
+
+    # rubocop:disable Rails/OutputSafety
+    def block_quote(raw_html)
+      if raw_html =~ /^<p>\[!(INFO|WARNING)\]\n/
+        state = Regexp.last_match(1).downcase.to_sym
+        content = raw_html.sub(/^<p>\[!(?:INFO|WARNING)\]\n/, '<p>')
+        component = Dsfr::AlertComponent.new(state:, heading_level: "h2", extra_class_names: "fr-my-3w")
+        component.render_in(view_context) do |c|
+          c.with_body { content.html_safe }
+        end
+      else
+        view_context.content_tag(:blockquote, raw_html.html_safe)
+      end
+    end
+    # rubocop:enable Rails/OutputSafety
   end
 end

spec/lib/redcarpet/trusted_renderer_spec.rb

@@ -32,4 +32,28 @@ RSpec.describe Redcarpet::TrustedRenderer do
       expect(renderer.render(markdown)).to include('<a href="mailto:user@example.com">user@example.com</a>')
     end
   end
+
+  context 'with block_quote DSFR alert' do
+    it 'renders [!INFO] blocks as DSFR info alerts' do
+      markdown = "> [!INFO]\n> This is an information alert with *emphasis*."
+      expected_html = <<~HTML
+        <div class='fr-alert fr-alert--info fr-my-3w'>
+        <h2 class="fr-alert__title">Information : </h2>
+        <p>This is an information alert with <em>emphasis</em>.</p>
+        </div>
+      HTML
+      expect(renderer.render(markdown).delete("\n")).to include(expected_html.delete("\n"))
+    end
+
+    it 'renders [!WARNING] blocks as DSFR warning alerts' do
+      markdown = "> [!WARNING]\n> This is a warning alert."
+      expected_html = <<~HTML
+        <div class='fr-alert fr-alert--warning fr-my-3w'>
+        <h2 class="fr-alert__title">Attention : </h2>
+        <p>This is a warning alert.</p>
+        </div>
+      HTML
+      expect(renderer.render(markdown).delete("\n")).to include(expected_html.delete("\n"))
+    end
+  end
 end