Add special styling to "Introduced in" notes

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/filters/introduced_in.rb b/lib/filters/introduced_in.rb
new file mode 100644
index 00000000..ac3ed9c6
--- /dev/null
+++ b/lib/filters/introduced_in.rb
@@ -0,0 +1,27 @@
+# encoding: utf-8
+
+# Adapted from the admonition code on http://nanoc.ws/
+class IntroducedInFilter < Nanoc::Filter
+
+  identifier :introduced_in
+
+  def run(content, params = {})
+    # `#dup` is necessary because `.fragment` modifies the incoming string. Ew!
+    # See https://github.com/sparklemotion/nokogiri/issues/1077
+    doc = Nokogiri::HTML.fragment(content.dup)
+    doc.css('blockquote').each do |blockquote|
+      content = blockquote.inner_html
+      next if content !~ /(<a href="[^"]+">)?Introduced(<\/a>)? in (<a href="[^"]+">)?GitLab/mi
+      new_content = generate(content)
+      blockquote.replace(new_content)
+    end
+    doc.to_s
+  end
+
+  def generate(content)
+    %[<div class="introduced-in">] +
+    content +
+    %[</div>]
+  end
+
+end