refactor: drop self implemented todo listitem

* GFM list is implemented in marked 0.4.0

lib/renderer.js

@@ -17,20 +17,6 @@ function Renderer() {
 
 require('util').inherits(Renderer, MarkedRenderer);
 
-// Support To-Do List
-Renderer.prototype.listitem = function(text) {
-  var result;
-
-  if (/^\s*\[[x ]\]\s*/.test(text)) {
-    text = text.replace(/^\s*\[ \]\s*/, '<input type="checkbox"></input> ').replace(/^\s*\[x\]\s*/, '<input type="checkbox" checked></input> ');
-    result = '<li>' + text + '</li>\n';
-  } else {
-    result = '<li>' + text + '</li>\n';
-  }
-
-  return result;
-};
-
 // Add id attribute to headings
 Renderer.prototype.heading = function(text, level) {
   var transformOption = this.options.modifyAnchors;

test/index.js

@@ -59,30 +59,6 @@ describe('Marked renderer', function() {
     result.should.eql('<h1 id="中文"><a href="#中文" class="headerlink" title="中文"></a>中文</h1>');
   });
 
-  it('to-do list testing', function() {
-    var body = [
-      '- [ ] test unchecked',
-      '- [x] test checked',
-      '- normal list [x] [ ]',
-      '',
-      'normal text [x] [ ]',
-      '',
-      '[x] [ ] normal text'
-    ].join('\n');
-
-    var result = r({text: body});
-
-    result.should.eql([
-      '<ul>\n',
-      '<li><input disabled="" type="checkbox"> test unchecked</li>\n',
-      '<li><input checked="" disabled="" type="checkbox"> test checked</li>\n',
-      '<li>normal list [x] [ ]</li>\n',
-      '</ul>\n',
-      '<p>normal text [x] [ ]</p>\n',
-      '<p>[x] [ ] normal text</p>\n'
-    ].join(''));
-  });
-
   // Description List tests
 
   it('should render description lists with a single space after the colon', function() {