resolves #200 add support for checklists in unordered list

2 files changed, 28 insertions, 4 deletions

diff --git a/lib/asciidoctor/backends/html5.rb b/lib/asciidoctor/backends/html5.rb
index 3d2bca24..c8f36f4c 100644
--- a/lib/asciidoctor/backends/html5.rb
+++ b/lib/asciidoctor/backends/html5.rb
@@ -620,12 +620,17 @@ end
 class BlockUlistTemplate < BaseTemplate
   def template
     @template ||= @eruby.new <<-EOS
-<%#encoding:UTF-8%><div#{id} class="ulist#{style_class}#{role_class}">
+<%#encoding:UTF-8%><div#{id} class="ulist<%= (checklist = (attr? 'option-checklist')) ? ' checklist' : nil %>#{style_class}#{role_class}">
 #{title_div}
-<ul><%
+<ul<%= checklist ? ' type="none"' : nil %>><%
+if checklist
+  # could use &#9745 (checked ballot) and &#9744 (ballot) w/o font instead
+  marker_checked = (attr? 'icons', 'font') ? '<i class="icon-check"></i> ' : '<input type="checkbox" data-item-complete="1" checked disabled> '
+  marker_unchecked = (attr? 'icons', 'font') ? '<i class="icon-check-empty"></i> ' : '<input type="checkbox" data-item-complete="0" disabled> '
+end
 content.each do |item| %>
 <li>
-<p><%= item.text %></p><%
+<p><% if checklist && (item.attr? 'checkbox') %><%= (item.attr? 'checked') ? marker_checked : marker_unchecked %><% end %><%= item.text %></p><%
   if item.blocks? %>
 <%= item.content %><%
   end %>
diff --git a/lib/asciidoctor/lexer.rb b/lib/asciidoctor/lexer.rb
index 21091f22..3201e00c 100644
--- a/lib/asciidoctor/lexer.rb
+++ b/lib/asciidoctor/lexer.rb
@@ -957,7 +957,26 @@ class Lexer
       has_text = !match[3].to_s.empty?
     else
       # Create list item using first line as the text of the list item
-      list_item = ListItem.new(list_block, match[2])
+      text = match[2]
+      checkbox = false
+      if text.start_with? '['
+        if text.start_with? '[ ] '
+          checkbox = true
+          checked = false
+          text = text[3..-1].lstrip
+        elsif text.start_with?('[*] ') || text.start_with?('[x] ')
+          checkbox = true
+          checked = true
+          text = text[3..-1].lstrip
+        end
+      end
+      list_item = ListItem.new(list_block, text)
+
+      if checkbox
+        list_block.attributes['option-checklist'] = ''
+        list_item.attributes['checkbox'] = ''
+        list_item.attributes['checked'] = '' if checked
+      end
 
       if !sibling_trait
         sibling_trait = resolve_list_marker(list_type, match[1], list_block.buffer.size, true)