Naive implementation

Author: ralsina

src/markd/renderers/html_renderer.cr

@@ -57,6 +57,13 @@ module Markd
       newline
       if entering
         tag("blockquote", attrs(node))
+        if node.data.fetch("alert", nil)
+          tag("div", {"class" => "alert alert-#{node.data["alert"]}"}) do
+            tag("strong") do
+              output(node.data["title"].as(String))
+            end
+          end
+        end
       else
         tag("blockquote", end_tag: true)
       end

src/markd/rules/block_quote.cr

@@ -11,6 +11,7 @@ module Markd::Rule
           # This is an alert
           node.data["alert"] = match[1]
           node.data["title"] = match[2].strip
+          parser.advance_offset(parser.line.size, false)
         end
 
         MatchValue::Container