重构 alert 插件

Author: neveler

Gemfile

@@ -33,4 +33,3 @@ gem "http_parser.rb", "0.8.0", :platforms => [:jruby]
 
 # plugin dependencies
 gem "nokogiri", "1.18.10"
-gem "addressable", "2.8.7"

_data/plugins/auto_alert.yml

@@ -0,0 +1,40 @@
+require "kramdown/converter/html"
+require "kramdown/element"
+
+module Alert
+  module HtmlExtension
+    def convert_blockquote(el, indent)
+      types = %w(note tip important warning caution)
+      first = el.children.first
+      return super unless first&.type == :p
+      return super if first.children.empty?
+
+      target = first.children.first
+      return super unless target&.type == :text
+
+      down = target.value.downcase
+      types.each do |type|
+        prefix = "[!#{type}]"
+
+        # case A: <p>[!NOTE]</p>
+        if down == prefix
+          el.attr["data-type"] = type
+          first.children.shift
+          break
+        end
+
+        head = prefix + "\n"
+        next unless down.start_with?(head)
+
+        # case B: <p>[!NOTE]\n some text</p>
+        el.attr["data-type"] = type
+        target.value = target.value[head.length..-1] || ""
+        break
+      end
+
+      super
+    end
+  end
+end
+
+Kramdown::Converter::Html.prepend(Alerts::HtmlExtension)