Replace the ShowDown Markdown engine with marked

8 files changed, 1138 insertions, 73 deletions

diff --git a/README.md b/README.md
index 4ce6a94..456b540 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ Markup hierarchy needs to be ``<div class="reveal"> <div class="slides"> <sectio
 
 It's possible to write your slides using Markdown. To enable Markdown, add the ```data-markdown``` attribute to your ```<section>``` elements and wrap the contents in a ```<script type="text/template">``` like the example below.
 
-This is based on [data-markdown](https://gist.github.com/1343518) from [Paul Irish](https://github.com/paulirish) which in turn uses [showdown](https://github.com/coreyti/showdown/). Sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).
+This is based on [data-markdown](https://gist.github.com/1343518) from [Paul Irish](https://github.com/paulirish) modified to use [marked](https://github.com/chjj/marked) to support [Github Flavoured Markdown](https://help.github.com/articles/github-flavored-markdown). Sensitive to indentation (avoid mixing tabs and spaces) and line breaks (avoid consecutive breaks).
 
 ```html
 <section data-markdown>
@@ -161,7 +161,7 @@ Reveal.initialize({
 		{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
 
 		// Interpret Markdown in <section> elements
-		{ src: 'plugin/markdown/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
+		{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 		{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 
 		// Syntax highlight for <code> elements
diff --git a/index.html b/index.html
index 8f4b3bc..699c038 100644
--- a/index.html
+++ b/index.html
@@ -363,7 +363,7 @@ function linkify( selector ) {
 				// Optional libraries used to extend on reveal.js
 				dependencies: [
 					{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
-					{ src: 'plugin/markdown/showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
+					{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 					{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 					{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },
 					{ src: 'plugin/zoom-js/zoom.js', async: true, condition: function() { return !!document.body.classList; } },
diff --git a/plugin/markdown/example.html b/plugin/markdown/example.html
index b4e7f91..1253cba 100644
--- a/plugin/markdown/example.html
+++ b/plugin/markdown/example.html
@@ -86,7 +86,7 @@
 				// Optional libraries used to extend on reveal.js
 				dependencies: [
 					{ src: '../../lib/js/classList.js', condition: function() { return !document.body.classList; } },
-					{ src: 'showdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
+					{ src: 'marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 					{ src: 'markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } }
 				]
 			});
diff --git a/plugin/markdown/markdown.js b/plugin/markdown/markdown.js
index 48fcfbd..473666b 100755
--- a/plugin/markdown/markdown.js
+++ b/plugin/markdown/markdown.js
@@ -2,8 +2,8 @@
 // Modified by Hakim to handle Markdown indented with tabs
 (function(){
 
-    if( typeof Showdown === 'undefined' ) {
-        throw 'The reveal.js Markdown plugin requires Showdown to be loaded';
+    if( typeof marked === 'undefined' ) {
+        throw 'The reveal.js Markdown plugin requires marked to be loaded';
     }
 
     var stripLeadingWhitespace = function(section) {
@@ -175,7 +175,7 @@
 
         var markdown = stripLeadingWhitespace(section);
 
-        section.innerHTML = (new Showdown.converter()).makeHtml(markdown);
+        section.innerHTML = marked(markdown);
 
         if( notes ) {
             section.appendChild( notes );
diff --git a/plugin/markdown/marked.js b/plugin/markdown/marked.js
new file mode 100644
index 0000000..b85ffa5
--- /dev/null
+++ b/plugin/markdown/marked.js
@@ -0,0 +1,1127 @@
+/**
+ * marked - a markdown parser
+ * Copyright (c) 2011-2013, Christopher Jeffrey. (MIT Licensed)
+ * https://github.com/chjj/marked
+ */
+
+;(function() {
+
+/**
+ * Block-Level Grammar
+ */
+
+var block = {
+  newline: /^\n+/,
+  code: /^( {4}[^\n]+\n*)+/,
+  fences: noop,
+  hr: /^( *[-*_]){3,} *(?:\n+|$)/,
+  heading: /^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)/,
+  nptable: noop,
+  lheading: /^([^\n]+)\n *(=|-){3,} *\n*/,
+  blockquote: /^( *>[^\n]+(\n[^\n]+)*\n*)+/,
+  list: /^( *)(bull) [\s\S]+?(?:hr|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
+  html: /^ *(?:comment|closed|closing) *(?:\n{2,}|\s*$)/,
+  def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +["(]([^\n]+)[")])? *(?:\n+|$)/,
+  table: noop,
+  paragraph: /^((?:[^\n]+\n?(?!hr|heading|lheading|blockquote|tag|def))+)\n*/,
+  text: /^[^\n]+/
+};
+
+block.bullet = /(?:[*+-]|\d+\.)/;
+block.item = /^( *)(bull) [^\n]*(?:\n(?!\1bull )[^\n]*)*/;
+block.item = replace(block.item, 'gm')
+  (/bull/g, block.bullet)
+  ();
+
+block.list = replace(block.list)
+  (/bull/g, block.bullet)
+  ('hr', /\n+(?=(?: *[-*_]){3,} *(?:\n+|$))/)
+  ();
+
+block._tag = '(?!(?:'
+  + 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code'
+  + '|var|samp|kbd|sub|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo'
+  + '|span|br|wbr|ins|del|img)\\b)\\w+(?!:/|@)\\b';
+
+block.html = replace(block.html)
+  ('comment', /<!--[\s\S]*?-->/)
+  ('closed', /<(tag)[\s\S]+?<\/\1>/)
+  ('closing', /<tag(?:"[^"]*"|'[^']*'|[^'">])*?>/)
+  (/tag/g, block._tag)
+  ();
+
+block.paragraph = replace(block.paragraph)
+  ('hr', block.hr)
+  ('heading', block.heading)
+  ('lheading', block.lheading)
+  ('blockquote', block.blockquote)
+  ('tag', '<' + block._tag)
+  ('def', block.def)
+  ();
+
+/**
+ * Normal Block Grammar
+ */
+
+block.normal = merge({}, block);
+
+/**
+ * GFM Block Grammar
+ */
+
+block.gfm = merge({}, block.normal, {
+  fences: /^ *(`{3,}|~{3,}) *(\S+)? *\n([\s\S]+?)\s*\1 *(?:\n+|$)/,
+  paragraph: /^/
+});
+
+block.gfm.paragraph = replace(block.paragraph)
+  ('(?!', '(?!' + block.gfm.fences.source.replace('\\1', '\\2') + '|')
+  ();
+
+/**
+ * GFM + Tables Block Grammar
+ */
+
+block.tables = merge({}, block.gfm, {
+  nptable: /^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*/,
+  table: /^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*/
+});
+
+/**
+ * Block Lexer
+ */
+
+function Lexer(options) {
+  this.tokens = [];
+  this.tokens.links = {};
+  this.options = options || marked.defaults;
+  this.rules = block.normal;
+
+  if (this.options.gfm) {
+    if (this.options.tables) {
+      this.rules = block.tables;
+    } else {
+      this.rules = block.gfm;
+    }
+  }
+}
+
+/**
+ * Expose Block Rules
+ */
+
+Lexer.rules = block;
+
+/**
+ * Static Lex Method
+ */
+
+Lexer.lex = function(src, options) {
+  var lexer = new Lexer(options);
+  return lexer.lex(src);
+};
+
+/**
+ * Preprocessing
+ */
+
+Lexer.prototype.lex = function(src) {
+  src = src
+    .replace(/\r\n|\r/g, '\n')
+    .replace(/\t/g, '    ')
+    .replace(/\u00a0/g, ' ')
+    .replace(/\u2424/g, '\n');
+
+  return this.token(src, true);
+};
+
+/**
+ * Lexing
+ */
+
+Lexer.prototype.token = function(src, top) {
+  var src = src.replace(/^ +$/gm, '')
+    , next
+    , loose
+    , cap
+    , bull
+    , b
+    , item
+    , space
+    , i
+    , l;
+
+  while (src) {
+    // newline
+    if (cap = this.rules.newline.exec(src)) {
+      src = src.substring(cap[0].length);
+      if (cap[0].length > 1) {
+        this.tokens.push({
+          type: 'space'
+        });
+      }
+    }
+
+    // code
+    if (cap = this.rules.code.exec(src)) {
+      src = src.substring(cap[0].length);
+      cap = cap[0].replace(/^ {4}/gm, '');
+      this.tokens.push({
+        type: 'code',
+        text: !this.options.pedantic
+          ? cap.replace(/\n+$/, '')
+          : cap
+      });
+      continue;
+    }
+
+    // fences (gfm)
+    if (cap = this.rules.fences.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'code',
+        lang: cap[2],
+        text: cap[3]
+      });
+      continue;
+    }
+
+    // heading
+    if (cap = this.rules.heading.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'heading',
+        depth: cap[1].length,
+        text: cap[2]
+      });
+      continue;
+    }
+
+    // table no leading pipe (gfm)
+    if (top && (cap = this.rules.nptable.exec(src))) {
+      src = src.substring(cap[0].length);
+
+      item = {
+        type: 'table',
+        header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
+        align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+        cells: cap[3].replace(/\n$/, '').split('\n')
+      };
+
+      for (i = 0; i < item.align.length; i++) {
+        if (/^ *-+: *$/.test(item.align[i])) {
+          item.align[i] = 'right';
+        } else if (/^ *:-+: *$/.test(item.align[i])) {
+          item.align[i] = 'center';
+        } else if (/^ *:-+ *$/.test(item.align[i])) {
+          item.align[i] = 'left';
+        } else {
+          item.align[i] = null;
+        }
+      }
+
+      for (i = 0; i < item.cells.length; i++) {
+        item.cells[i] = item.cells[i].split(/ *\| */);
+      }
+
+      this.tokens.push(item);
+
+      continue;
+    }
+
+    // lheading
+    if (cap = this.rules.lheading.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'heading',
+        depth: cap[2] === '=' ? 1 : 2,
+        text: cap[1]
+      });
+      continue;
+    }
+
+    // hr
+    if (cap = this.rules.hr.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'hr'
+      });
+      continue;
+    }
+
+    // blockquote
+    if (cap = this.rules.blockquote.exec(src)) {
+      src = src.substring(cap[0].length);
+
+      this.tokens.push({
+        type: 'blockquote_start'
+      });
+
+      cap = cap[0].replace(/^ *> ?/gm, '');
+
+      // Pass `top` to keep the current
+      // "toplevel" state. This is exactly
+      // how markdown.pl works.
+      this.token(cap, top);
+
+      this.tokens.push({
+        type: 'blockquote_end'
+      });
+
+      continue;
+    }
+
+    // list
+    if (cap = this.rules.list.exec(src)) {
+      src = src.substring(cap[0].length);
+      bull = cap[2];
+
+      this.tokens.push({
+        type: 'list_start',
+        ordered: bull.length > 1
+      });
+
+      // Get each top-level item.
+      cap = cap[0].match(this.rules.item);
+
+      next = false;
+      l = cap.length;
+      i = 0;
+
+      for (; i < l; i++) {
+        item = cap[i];
+
+        // Remove the list item's bullet
+        // so it is seen as the next token.
+        space = item.length;
+        item = item.replace(/^ *([*+-]|\d+\.) +/, '');
+
+        // Outdent whatever the
+        // list item contains. Hacky.
+        if (~item.indexOf('\n ')) {
+          space -= item.length;
+          item = !this.options.pedantic
+            ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
+            : item.replace(/^ {1,4}/gm, '');
+        }
+
+        // Determine whether the next list item belongs here.
+        // Backpedal if it does not belong in this list.
+        if (this.options.smartLists && i !== l - 1) {
+          b = block.bullet.exec(cap[i+1])[0];
+          if (bull !== b && !(bull.length > 1 && b.length > 1)) {
+            src = cap.slice(i + 1).join('\n') + src;
+            i = l - 1;
+          }
+        }
+
+        // Determine whether item is loose or not.
+        // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
+        // for discount behavior.
+        loose = next || /\n\n(?!\s*$)/.test(item);
+        if (i !== l - 1) {
+          next = item[item.length-1] === '\n';
+          if (!loose) loose = next;
+        }
+
+        this.tokens.push({
+          type: loose
+            ? 'loose_item_start'
+            : 'list_item_start'
+        });
+
+        // Recurse.
+        this.token(item, false);
+
+        this.tokens.push({
+          type: 'list_item_end'
+        });
+      }
+
+      this.tokens.push({
+        type: 'list_end'
+      });
+
+      continue;
+    }
+
+    // html
+    if (cap = this.rules.html.exec(src)) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: this.options.sanitize
+          ? 'paragraph'
+          : 'html',
+        pre: cap[1] === 'pre' || cap[1] === 'script',
+        text: cap[0]
+      });
+      continue;
+    }
+
+    // def
+    if (top && (cap = this.rules.def.exec(src))) {
+      src = src.substring(cap[0].length);
+      this.tokens.links[cap[1].toLowerCase()] = {
+        href: cap[2],
+        title: cap[3]
+      };
+      continue;
+    }
+
+    // table (gfm)
+    if (top && (cap = this.rules.table.exec(src))) {
+      src = src.substring(cap[0].length);
+
+      item = {
+        type: 'table',
+        header: cap[1].replace(/^ *| *\| *$/g, '').split(/ *\| */),
+        align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+        cells: cap[3].replace(/(?: *\| *)?\n$/, '').split('\n')
+      };
+
+      for (i = 0; i < item.align.length; i++) {
+        if (/^ *-+: *$/.test(item.align[i])) {
+          item.align[i] = 'right';
+        } else if (/^ *:-+: *$/.test(item.align[i])) {
+          item.align[i] = 'center';
+        } else if (/^ *:-+ *$/.test(item.align[i])) {
+          item.align[i] = 'left';
+        } else {
+          item.align[i] = null;
+        }
+      }
+
+      for (i = 0; i < item.cells.length; i++) {
+        item.cells[i] = item.cells[i]
+          .replace(/^ *\| *| *\| *$/g, '')
+          .split(/ *\| */);
+      }
+
+      this.tokens.push(item);
+
+      continue;
+    }
+
+    // top-level paragraph
+    if (top && (cap = this.rules.paragraph.exec(src))) {
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'paragraph',
+        text: cap[1][cap[1].length-1] === '\n'
+          ? cap[1].slice(0, -1)
+          : cap[1]
+      });
+      continue;
+    }
+
+    // text
+    if (cap = this.rules.text.exec(src)) {
+      // Top-level should never reach here.
+      src = src.substring(cap[0].length);
+      this.tokens.push({
+        type: 'text',
+        text: cap[0]
+      });
+      continue;
+    }
+
+    if (src) {
+      throw new
+        Error('Infinite loop on byte: ' + src.charCodeAt(0));
+    }
+  }
+
+  return this.tokens;
+};
+
+/**
+ * Inline-Level Grammar
+ */
+
+var inline = {
+  escape: /^\\([\\`*{}\[\]()#+\-.!_>])/,
+  autolink: /^<([^ >]+(@|:\/)[^ >]+)>/,
+  url: noop,
+  tag: /^<!--[\s\S]*?-->|^<\/?\w+(?:"[^"]*"|'[^']*'|[^'">])*?>/,
+  link: /^!?\[(inside)\]\(href\)/,
+  reflink: /^!?\[(inside)\]\s*\[([^\]]*)\]/,
+  nolink: /^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]/,
+  strong: /^__([\s\S]+?)__(?!_)|^\*\*([\s\S]+?)\*\*(?!\*)/,
+  em: /^\b_((?:__|[\s\S])+?)_\b|^\*((?:\*\*|[\s\S])+?)\*(?!\*)/,
+  code: /^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)/,
+  br: /^ {2,}\n(?!\s*$)/,
+  del: noop,
+  text: /^[\s\S]+?(?=[\\<!\[_*`]| {2,}\n|$)/
+};
+
+inline._inside = /(?:\[[^\]]*\]|[^\]]|\](?=[^\[]*\]))*/;
+inline._href = /\s*<?([^\s]*?)>?(?:\s+['"]([\s\S]*?)['"])?\s*/;
+
+inline.link = replace(inline.link)
+  ('inside', inline._inside)
+  ('href', inline._href)
+  ();
+
+inline.reflink = replace(inline.reflink)
+  ('inside', inline._inside)
+  ();
+
+/**
+ * Normal Inline Grammar
+ */
+
+inline.normal = merge({}, inline);
+
+/**
+ * Pedantic Inline Grammar
+ */
+
+inline.pedantic = merge({}, inline.normal, {
+  strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
+  em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/
+});
+
+/**
+ * GFM Inline Grammar
+ */
+
+inline.gfm = merge({}, inline.normal, {
+  escape: replace(inline.escape)('])', '~|])')(),
+  url: /^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])/,
+  del: /^~~(?=\S)([\s\S]*?\S)~~/,
+  text: replace(inline.text)
+    (']|', '~]|')
+    ('|', '|https?://|')
+    ()
+});
+
+/**
+ * GFM + Line Breaks Inline Grammar
+ */
+
+inline.breaks = merge({}, inline.gfm, {
+  br: replace(inline.br)('{2,}', '*')(),
+  text: replace(inline.gfm.text)('{2,}', '*')()
+});
+
+/**
+ * Inline Lexer & Compiler
+ */
+
+function InlineLexer(links, options) {
+  this.options = options || marked.defaults;
+  this.links = links;
+  this.rules = inline.normal;
+
+  if (!this.links) {
+    throw new
+      Error('Tokens array requires a `links` property.');
+  }
+
+  if (this.options.gfm) {
+    if (this.options.breaks) {
+      this.rules = inline.breaks;
+    } else {
+      this.rules = inline.gfm;
+    }
+  } else if (this.options.pedantic) {
+    this.rules = inline.pedantic;
+  }
+}
+
+/**
+ * Expose Inline Rules
+ */
+
+InlineLexer.rules = inline;
+
+/**
+ * Static Lexing/Compiling Method
+ */
+
+InlineLexer.output = function(src, links, options) {
+  var inline = new InlineLexer(links, options);
+  return inline.output(src);
+};
+
+/**
+ * Lexing/Compiling
+ */
+
+InlineLexer.prototype.output = function(src) {
+  var out = ''
+    , link
+    , text
+    , href
+    , cap;
+
+  while (src) {
+    // escape
+    if (cap = this.rules.escape.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += cap[1];
+      continue;
+    }
+
+    // autolink
+    if (cap = this.rules.autolink.exec(src)) {
+      src = src.substring(cap[0].length);
+      if (cap[2] === '@') {
+        text = cap[1][6] === ':'
+          ? this.mangle(cap[1].substring(7))
+          : this.mangle(cap[1]);
+        href = this.mangle('mailto:') + text;
+      } else {
+        text = escape(cap[1]);
+        href = text;
+      }
+      out += '<a href="'
+        + href
+        + '">'
+        + text
+        + '</a>';
+      continue;
+    }
+
+    // url (gfm)
+    if (cap = this.rules.url.exec(src)) {
+      src = src.substring(cap[0].length);
+      text = escape(cap[1]);
+      href = text;
+      out += '<a href="'
+        + href
+        + '">'
+        + text
+        + '</a>';
+      continue;
+    }
+
+    // tag
+    if (cap = this.rules.tag.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += this.options.sanitize
+        ? escape(cap[0])
+        : cap[0];
+      continue;
+    }
+
+    // link
+    if (cap = this.rules.link.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += this.outputLink(cap, {
+        href: cap[2],
+        title: cap[3]
+      });
+      continue;
+    }
+
+    // reflink, nolink
+    if ((cap = this.rules.reflink.exec(src))
+        || (cap = this.rules.nolink.exec(src))) {
+      src = src.substring(cap[0].length);
+      link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
+      link = this.links[link.toLowerCase()];
+      if (!link || !link.href) {
+        out += cap[0][0];
+        src = cap[0].substring(1) + src;
+        continue;
+      }
+      out += this.outputLink(cap, link);
+      continue;
+    }
+
+    // strong
+    if (cap = this.rules.strong.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<strong>'
+        + this.output(cap[2] || cap[1])
+        + '</strong>';
+      continue;
+    }
+
+    // em
+    if (cap = this.rules.em.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<em>'
+        + this.output(cap[2] || cap[1])
+        + '</em>';
+      continue;
+    }
+
+    // code
+    if (cap = this.rules.code.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<code>'
+        + escape(cap[2], true)
+        + '</code>';
+      continue;
+    }
+
+    // br
+    if (cap = this.rules.br.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<br>';
+      continue;
+    }
+
+    // del (gfm)
+    if (cap = this.rules.del.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += '<del>'
+        + this.output(cap[1])
+        + '</del>';
+      continue;
+    }
+
+    // text
+    if (cap = this.rules.text.exec(src)) {
+      src = src.substring(cap[0].length);
+      out += escape(cap[0]);
+      continue;
+    }
+
+    if (src) {
+      throw new
+        Error('Infinite loop on byte: ' + src.charCodeAt(0));
+    }
+  }
+
+  return out;
+};
+
+/**
+ * Compile Link
+ */
+
+InlineLexer.prototype.outputLink = function(cap, link) {
+  if (cap[0][0] !== '!') {
+    return '<a href="'
+      + escape(link.href)
+      + '"'
+      + (link.title
+      ? ' title="'
+      + escape(link.title)
+      + '"'
+      : '')
+      + '>'
+      + this.output(cap[1])
+      + '</a>';
+  } else {
+    return '<img src="'
+      + escape(link.href)
+      + '" alt="'
+      + escape(cap[1])
+      + '"'
+      + (link.title
+      ? ' title="'
+      + escape(link.title)
+      + '"'
+      : '')
+      + '>';
+  }
+};
+
+/**
+ * Smartypants Transformations
+ */
+
+InlineLexer.prototype.smartypants = function(text) {
+  if (!this.options.smartypants) return text;
+  return text
+    .replace(/--/g, '—')
+    .replace(/'([^']*)'/g, '‘$1’')
+    .replace(/"([^"]*)"/g, '“$1”')
+    .replace(/\.{3}/g, '…');
+};
+
+/**
+ * Mangle Links
+ */
+
+InlineLexer.prototype.mangle = function(text) {
+  var out = ''
+    , l = text.length
+    , i = 0
+    , ch;
+
+  for (; i < l; i++) {
+    ch = text.charCodeAt(i);
+    if (Math.random() > 0.5) {
+      ch = 'x' + ch.toString(16);
+    }
+    out += '&#' + ch + ';';
+  }
+
+  return out;
+};
+
+/**
+ * Parsing & Compiling
+ */
+
+function Parser(options) {
+  this.tokens = [];
+  this.token = null;
+  this.options = options || marked.defaults;
+}
+
+/**
+ * Static Parse Method
+ */
+
+Parser.parse = function(src, options) {
+  var parser = new Parser(options);
+  return parser.parse(src);
+};
+
+/**
+ * Parse Loop
+ */
+
+Parser.prototype.parse = function(src) {
+  this.inline = new InlineLexer(src.links, this.options);
+  this.tokens = src.reverse();
+
+  var out = '';
+  while (this.next()) {
+    out += this.tok();
+  }
+
+  return out;
+};
+
+/**
+ * Next Token
+ */
+
+Parser.prototype.next = function() {
+  return this.token = this.tokens.pop();
+};
+
+/**
+ * Preview Next Token
+ */
+
+Parser.prototype.peek = function() {
+  return this.tokens[this.tokens.length-1] || 0;
+};
+
+/**
+ * Parse Text Tokens
+ */
+
+Parser.prototype.parseText = function() {
+  var body = this.token.text;
+
+  while (this.peek().type === 'text') {
+    body += '\n' + this.next().text;
+  }
+
+  return this.inline.output(body);
+};
+
+/**
+ * Parse Current Token
+ */
+
+Parser.prototype.tok = function() {
+  switch (this.token.type) {
+    case 'space': {
+      return '';
+    }
+    case 'hr': {
+      return '<hr>\n';
+    }
+    case 'heading': {
+      return '<h'
+        + this.token.depth
+        + '>'
+        + this.inline.output(this.token.text)
+        + '</h'
+        + this.token.depth
+        + '>\n';
+    }
+    case 'code': {
+      if (this.options.highlight) {
+        var code = this.options.highlight(this.token.text, this.token.lang);
+        if (code != null && code !== this.token.text) {
+          this.token.escaped = true;
+          this.token.text = code;
+        }
+      }
+
+      if (!this.token.escaped) {
+        this.token.text = escape(this.token.text, true);
+      }
+
+      return '<pre><code'
+        + (this.token.lang
+        ? ' class="'
+        + this.options.langPrefix
+        + this.token.lang
+        + '"'
+        : '')
+        + '>'
+        + this.token.text
+        + '</code></pre>\n';
+    }
+    case 'table': {
+      var body = ''
+        , heading
+        , i
+        , row
+        , cell
+        , j;
+
+      // header
+      body += '<thead>\n<tr>\n';
+      for (i = 0; i < this.token.header.length; i++) {
+        heading = this.inline.output(this.token.header[i]);
+        body += this.token.align[i]
+          ? '<th align="' + this.token.align[i] + '">' + heading + '</th>\n'
+          : '<th>' + heading + '</th>\n';
+      }
+      body += '</tr>\n</thead>\n';
+
+      // body
+      body += '<tbody>\n'
+      for (i = 0; i < this.token.cells.length; i++) {
+        row = this.token.cells[i];
+        body += '<tr>\n';
+        for (j = 0; j < row.length; j++) {
+          cell = this.inline.output(row[j]);
+          body += this.token.align[j]
+            ? '<td align="' + this.token.align[j] + '">' + cell + '</td>\n'
+            : '<td>' + cell + '</td>\n';
+        }
+        body += '</tr>\n';
+      }
+      body += '</tbody>\n';
+
+      return '<table>\n'
+        + body
+        + '</table>\n';
+    }
+    case 'blockquote_start': {
+      var body = '';
+
+      while (this.next().type !== 'blockquote_end') {
+        body += this.tok();
+      }
+
+      return '<blockquote>\n'
+        + body
+        + '</blockquote>\n';
+    }
+    case 'list_start': {
+      var type = this.token.ordered ? 'ol' : 'ul'
+        , body = '';
+
+      while (this.next().type !== 'list_end') {
+        body += this.tok();
+      }
+
+      return '<'
+        + type
+        + '>\n'
+        + body
+        + '</'
+        + type
+        + '>\n';
+    }
+    case 'list_item_start': {
+      var body = '';
+
+      while (this.next().type !== 'list_item_end') {
+        body += this.token.type === 'text'
+          ? this.parseText()
+          : this.tok();
+      }
+
+      return '<li>'
+        + body
+        + '</li>\n';
+    }
+    case 'loose_item_start': {
+      var body = '';
+
+      while (this.next().type !== 'list_item_end') {
+        body += this.tok();
+      }
+
+      return '<li>'
+        + body
+        + '</li>\n';
+    }
+    case 'html': {
+      return !this.token.pre && !this.options.pedantic
+        ? this.inline.output(this.token.text)
+        : this.token.text;
+    }
+    case 'paragraph': {
+      return '<p>'
+        + this.inline.output(this.token.text)
+        + '</p>\n';
+    }
+    case 'text': {
+      return '<p>'
+        + this.parseText()
+        + '</p>\n';
+    }
+  }
+};
+
+/**
+ * Helpers
+ */
+
+function escape(html, encode) {
+  return html
+    .replace(!encode ? /&(?!#?\w+;)/g : /&/g, '&amp;')
+    .replace(/</g, '&lt;')
+    .replace(/>/g, '&gt;')
+    .replace(/"/g, '&quot;')
+    .replace(/'/g, '&#39;');
+}
+
+function replace(regex, opt) {
+  regex = regex.source;
+  opt = opt || '';
+  return function self(name, val) {
+    if (!name) return new RegExp(regex, opt);
+    val = val.source || val;
+    val = val.replace(/(^|[^\[])\^/g, '$1');
+    regex = regex.replace(name, val);
+    return self;
+  };
+}
+
+function noop() {}
+noop.exec = noop;
+
+function merge(obj) {
+  var i = 1
+    , target
+    , key;
+
+  for (; i < arguments.length; i++) {
+    target = arguments[i];
+    for (key in target) {
+      if (Object.prototype.hasOwnProperty.call(target, key)) {
+        obj[key] = target[key];
+      }
+    }
+  }
+
+  return obj;
+}
+
+/**
+ * Marked
+ */
+
+function marked(src, opt, callback) {
+  if (callback || typeof opt === 'function') {
+    if (!callback) {
+      callback = opt;
+      opt = null;
+    }
+
+    if (opt) opt = merge({}, marked.defaults, opt);
+
+    var tokens = Lexer.lex(tokens, opt)
+      , highlight = opt.highlight
+      , pending = 0
+      , l = tokens.length
+      , i = 0;
+
+    if (!highlight || highlight.length < 3) {
+      return callback(null, Parser.parse(tokens, opt));
+    }
+
+    var done = function() {
+      delete opt.highlight;
+      var out = Parser.parse(tokens, opt);
+      opt.highlight = highlight;
+      return callback(null, out);
+    };
+
+    for (; i < l; i++) {
+      (function(token) {
+        if (token.type !== 'code') return;
+        pending++;
+        return highlight(token.text, token.lang, function(err, code) {
+          if (code == null || code === token.text) {
+            return --pending || done();
+          }
+          token.text = code;
+          token.escaped = true;
+          --pending || done();
+        });
+      })(tokens[i]);
+    }
+
+    return;
+  }
+  try {
+    if (opt) opt = merge({}, marked.defaults, opt);
+    return Parser.parse(Lexer.lex(src, opt), opt);
+  } catch (e) {
+    e.message += '\nPlease report this to https://github.com/chjj/marked.';
+    if ((opt || marked.defaults).silent) {
+      return '<p>An error occured:</p><pre>'
+        + escape(e.message + '', true)
+        + '</pre>';
+    }
+    throw e;
+  }
+}
+
+/**
+ * Options
+ */
+
+marked.options =
+marked.setOptions = function(opt) {
+  merge(marked.defaults, opt);
+  return marked;
+};
+
+marked.defaults = {
+  gfm: true,
+  tables: true,
+  breaks: false,
+  pedantic: false,
+  sanitize: false,
+  smartLists: false,
+  silent: false,
+  highlight: null,
+  langPrefix: 'lang-'
+};
+
+/**
+ * Expose
+ */
+
+marked.Parser = Parser;
+marked.parser = Parser.parse;
+
+marked.Lexer = Lexer;
+marked.lexer = Lexer.lex;
+
+marked.InlineLexer = InlineLexer;
+marked.inlineLexer = InlineLexer.output;
+
+marked.parse = marked;
+
+if (typeof exports === 'object') {
+  module.exports = marked;
+} else if (typeof define === 'function' && define.amd) {
+  define(function() { return marked; });
+} else {
+  this.marked = marked;
+}
+
+}).call(function() {
+  return this || (typeof window !== 'undefined' ? window : global);
+}());
diff --git a/plugin/markdown/showdown.js b/plugin/markdown/showdown.js
deleted file mode 100644
index 3f280f4..0000000
--- a/plugin/markdown/showdown.js
+++ /dev/null
@@ -1,62 +0,0 @@
-//
-// showdown.js -- A javascript port of Markdown.
-//
-// Copyright (c) 2007 John Fraser.
-//
-// Original Markdown Copyright (c) 2004-2005 John Gruber
-//   <http://daringfireball.net/projects/markdown/>
-//
-// Redistributable under a BSD-style open source license.
-// See license.txt for more information.
-//
-// The full source distribution is at:
-//
-//				A A L
-//				T C A
-//				T K B
-//
-//   <http://www.attacklab.net/>
-//
-//
-// Wherever possible, Showdown is a straight, line-by-line port
-// of the Perl version of Markdown.
-//
-// This is not a normal parser design; it's basically just a
-// series of string substitutions.  It's hard to read and
-// maintain this way,  but keeping Showdown close to the original
-// design makes it easier to port new features.
-//
-// More importantly, Showdown behaves like markdown.pl in most
-// edge cases.  So web applications can do client-side preview
-// in Javascript, and then build identical HTML on the server.
-//
-// This port needs the new RegExp functionality of ECMA 262,
-// 3rd Edition (i.e. Javascript 1.5).  Most modern web browsers
-// should do fine.  Even with the new regular expression features,
-// We do a lot of work to emulate Perl's regex functionality.
-// The tricky changes in this file mostly have the "attacklab:"
-// label.  Major or self-explanatory changes don't.
-//
-// Smart diff tools like Araxis Merge will be able to match up
-// this file with markdown.pl in a useful way.  A little tweaking
-// helps: in a copy of markdown.pl, replace "#" with "//" and
-// replace "$text" with "text".  Be sure to ignore whitespace
-// and line endings.
-//
-//
-// Showdown usage:
-//
-//   var text = "Markdown *rocks*.";
-//
-//   var converter = new Showdown.converter();
-//   var html = converter.makeHtml(text);
-//
-//   alert(html);
-//
-// Note: move the sample code to the bottom of this
-// file before uncommenting it.
-//
-//
-// Showdown namespace
-//
-var Showdown={};Showdown.converter=function(){var a,b,c,d=0;this.makeHtml=function(d){return a=new Array,b=new Array,c=new Array,d=d.replace(/~/g,"~T"),d=d.replace(/\$/g,"~D"),d=d.replace(/\r\n/g,"\n"),d=d.replace(/\r/g,"\n"),d="\n\n"+d+"\n\n",d=F(d),d=d.replace(/^[ \t]+$/mg,""),d=f(d),d=e(d),d=h(d),d=D(d),d=d.replace(/~D/g,"$$"),d=d.replace(/~T/g,"~"),d};var e=function(c){var c=c.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?[ \t]*\n?[ \t]*(?:(\n*)["(](.+?)[")][ \t]*)?(?:\n+|\Z)/gm,function(c,d,e,f,g){return d=d.toLowerCase(),a[d]=z(e),f?f+g:(g&&(b[d]=g.replace(/"/g,"&quot;")),"")});return c},f=function(a){a=a.replace(/\n/g,"\n\n");var b="p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del",c="p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math";return a=a.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del)\b[^\r]*?\n<\/\2>[ \t]*(?=\n+))/gm,g),a=a.replace(/^(<(p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math)\b[^\r]*?.*<\/\2>[ \t]*(?=\n+)\n)/gm,g),a=a.replace(/(\n[ ]{0,3}(<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g,g),a=a.replace(/(\n\n[ ]{0,3}<!(--[^\r]*?--\s*)+>[ \t]*(?=\n{2,}))/g,g),a=a.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g,g),a=a.replace(/\n\n/g,"\n"),a},g=function(a,b){var d=b;return d=d.replace(/\n\n/g,"\n"),d=d.replace(/^\n/,""),d=d.replace(/\n+$/g,""),d="\n\n~K"+(c.push(d)-1)+"K\n\n",d},h=function(a){a=o(a);var b=t("<hr />");return a=a.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm,b),a=a.replace(/^[ ]{0,2}([ ]?\-[ ]?){3,}[ \t]*$/gm,b),a=a.replace(/^[ ]{0,2}([ ]?\_[ ]?){3,}[ \t]*$/gm,b),a=q(a),a=s(a),a=r(a),a=x(a),a=f(a),a=y(a),a},i=function(a){return a=u(a),a=j(a),a=A(a),a=m(a),a=k(a),a=B(a),a=z(a),a=w(a),a=a.replace(/  +\n/g," <br />\n"),a},j=function(a){var b=/(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--.*?--\s*)+>)/gi;return a=a.replace(b,function(a){var b=a.replace(/(.)<\/?code>(?=.)/g,"$1`");return b=G(b,"\\`*_"),b}),a},k=function(a){return a=a.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,l),a=a.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?(.*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,l),a=a.replace(/(\[([^\[\]]+)\])()()()()()/g,l),a},l=function(c,d,e,f,g,h,i,j){j==undefined&&(j="");var k=d,l=e,m=f.toLowerCase(),n=g,o=j;if(n==""){m==""&&(m=l.toLowerCase().replace(/ ?\n/g," ")),n="#"+m;if(a[m]!=undefined)n=a[m],b[m]!=undefined&&(o=b[m]);else{if(!(k.search(/\(\s*\)$/m)>-1))return k;n=""}}n=G(n,"*_");var p='<a href="'+n+'"';return o!=""&&(o=o.replace(/"/g,"&quot;"),o=G(o,"*_"),p+=' title="'+o+'"'),p+=">"+l+"</a>",p},m=function(a){return a=a.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g,n),a=a.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,n),a},n=function(c,d,e,f,g,h,i,j){var k=d,l=e,m=f.toLowerCase(),n=g,o=j;o||(o="");if(n==""){m==""&&(m=l.toLowerCase().replace(/ ?\n/g," ")),n="#"+m;if(a[m]==undefined)return k;n=a[m],b[m]!=undefined&&(o=b[m])}l=l.replace(/"/g,"&quot;"),n=G(n,"*_");var p='<img src="'+n+'" alt="'+l+'"';return o=o.replace(/"/g,"&quot;"),o=G(o,"*_"),p+=' title="'+o+'"',p+=" />",p},o=function(a){function b(a){return a.replace(/[^\w]/g,"").toLowerCase()}return a=a.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,function(a,c){return t('<h1 id="'+b(c)+'">'+i(c)+"</h1>")}),a=a.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,function(a,c){return t('<h2 id="'+b(c)+'">'+i(c)+"</h2>")}),a=a.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,function(a,c,d){var e=c.length;return t("<h"+e+' id="'+b(d)+'">'+i(d)+"</h"+e+">")}),a},p,q=function(a){a+="~0";var b=/^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;return d?a=a.replace(b,function(a,b,c){var d=b,e=c.search(/[*+-]/g)>-1?"ul":"ol";d=d.replace(/\n{2,}/g,"\n\n\n");var f=p(d);return f=f.replace(/\s+$/,""),f="<"+e+">"+f+"</"+e+">\n",f}):(b=/(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g,a=a.replace(b,function(a,b,c,d){var e=b,f=c,g=d.search(/[*+-]/g)>-1?"ul":"ol",f=f.replace(/\n{2,}/g,"\n\n\n"),h=p(f);return h=e+"<"+g+">\n"+h+"</"+g+">\n",h})),a=a.replace(/~0/,""),a};p=function(a){return d++,a=a.replace(/\n{2,}$/,"\n"),a+="~0",a=a.replace(/(\n)?(^[ \t]*)([*+-]|\d+[.])[ \t]+([^\r]+?(\n{1,2}))(?=\n*(~0|\2([*+-]|\d+[.])[ \t]+))/gm,function(a,b,c,d,e){var f=e,g=b,j=c;return g||f.search(/\n{2,}/)>-1?f=h(E(f)):(f=q(E(f)),f=f.replace(/\n$/,""),f=i(f)),"<li>"+f+"</li>\n"}),a=a.replace(/~0/g,""),d--,a};var r=function(a){return a+="~0",a=a.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,function(a,b,c){var d=b,e=c;return d=v(E(d)),d=F(d),d=d.replace(/^\n+/g,""),d=d.replace(/\n+$/g,""),d="<pre><code>"+d+"\n</code></pre>",t(d)+e}),a=a.replace(/~0/,""),a},s=function(a){return 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diff --git a/plugin/notes-server/notes.html b/plugin/notes-server/notes.html
index 053cb5e..551e400 100644
--- a/plugin/notes-server/notes.html
+++ b/plugin/notes-server/notes.html
@@ -99,7 +99,7 @@
 		<div id="notes"></div>
 
 		<script src="/socket.io/socket.io.js"></script>
-		<script src="/plugin/markdown/showdown.js"></script>
+		<script src="/plugin/markdown/marked.js"></script>
 
 		<script>
 		var socketId = '{{socketId}}';
@@ -113,7 +113,7 @@
 			if (data.socketId !== socketId) { return; }
 
 			if (data.markdown) {
-				notes.innerHTML = (new Showdown.converter()).makeHtml(data.notes);
+				notes.innerHTML = marked(data.notes);
 			}
 			else {
 				notes.innerHTML = data.notes;
diff --git a/plugin/notes/notes.html b/plugin/notes/notes.html
index e14c6ac..830045d 100644
--- a/plugin/notes/notes.html
+++ b/plugin/notes/notes.html
@@ -159,7 +159,7 @@
 
 		<div id="notes"></div>
 
-		<script src="../../plugin/markdown/showdown.js"></script>
+		<script src="../../plugin/markdown/marked.js"></script>
 		<script>
 
 			window.addEventListener( 'load', function() {
@@ -175,7 +175,7 @@
 						// No need for updating the notes in case of fragment changes
 						if ( data.notes !== undefined) {
 							if( data.markdown ) {
-								notes.innerHTML = (new Showdown.converter()).makeHtml( data.notes );
+								notes.innerHTML = marked( data.notes );
 							}
 							else {
 								notes.innerHTML = data.notes;