From f5f61980867c90e4bad32125a2fb763b82946317 2011-08-09 17:05:20
From: Brian E. Granger <ellisonbg@gmail.com>
Date: 2011-08-09 17:05:20
Subject: [PATCH] Starting work on a Markdown cell.

---

diff --git a/IPython/frontend/html/notebook/handlers.py b/IPython/frontend/html/notebook/handlers.py
index b60ad95..2f53693 100644
--- a/IPython/frontend/html/notebook/handlers.py
+++ b/IPython/frontend/html/notebook/handlers.py
@@ -6,11 +6,17 @@
 
 import json
 import logging
+import os
 import urllib
 
 from tornado import web
 from tornado import websocket
 
+try:
+    from docutils.core import publish_string
+except ImportError:
+    publish_string = None
+
 
 #-----------------------------------------------------------------------------
 # Top-level handlers
@@ -156,3 +162,51 @@ class NotebookHandler(web.RequestHandler):
         self.set_status(204)
         self.finish()
 
+#-----------------------------------------------------------------------------
+# RST web service handlers
+#-----------------------------------------------------------------------------
+
+_rst_header = """========
+Heading1
+========
+
+Heading2
+========
+
+Heading3
+--------
+
+Heading4
+^^^^^^^^
+
+"""
+
+class RSTHandler(web.RequestHandler):
+
+    def post(self):
+        if publish_string is None:
+            raise web.HTTPError(503)
+        body = self.request.body.strip()
+        source = _rst_header + body
+        template_path=os.path.join(os.path.dirname(__file__), u'templates', u'rst_template.html')
+        print template_path
+        defaults = {'file_insertion_enabled': 0,
+                    'raw_enabled': 0,
+                    '_disable_config': 1,
+                    'stylesheet_path': 0,
+                    'initial_header_level': 3,
+                    'template': template_path
+        }
+        try:
+            html = publish_string(source, writer_name='html',
+                                  settings_overrides=defaults
+            )
+        except:
+            raise web.HTTPError(400)
+        print html
+#        html = '\n'.join(html.split('\n')[7:-3])
+#        print html
+        self.set_header('Content-Type', 'text/html')
+        self.finish(html)
+
+
diff --git a/IPython/frontend/html/notebook/notebookapp.py b/IPython/frontend/html/notebook/notebookapp.py
index 4b59303..b0a78e5 100644
--- a/IPython/frontend/html/notebook/notebookapp.py
+++ b/IPython/frontend/html/notebook/notebookapp.py
@@ -32,7 +32,7 @@ from .sessionmanager import SessionManager
 from .handlers import (
     NBBrowserHandler, NewHandler, NamedNotebookHandler,
     MainKernelHandler, KernelHandler, KernelActionHandler, ZMQStreamHandler,
-    NotebookRootHandler, NotebookHandler
+    NotebookRootHandler, NotebookHandler, RSTHandler
 )
 from .notebookmanager import NotebookManager
 
@@ -75,7 +75,8 @@ class NotebookWebApplication(web.Application):
             (r"/kernels/%s/iopub" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='iopub')),
             (r"/kernels/%s/shell" % _kernel_id_regex, ZMQStreamHandler, dict(stream_name='shell')),
             (r"/notebooks", NotebookRootHandler),
-            (r"/notebooks/%s" % _notebook_id_regex, NotebookHandler)
+            (r"/notebooks/%s" % _notebook_id_regex, NotebookHandler),
+            (r"/rstservice/render", RSTHandler)
         ]
         settings = dict(
             template_path=os.path.join(os.path.dirname(__file__), "templates"),
diff --git a/IPython/frontend/html/notebook/static/css/notebook.css b/IPython/frontend/html/notebook/static/css/notebook.css
index a0d7f5d..1555d00 100644
--- a/IPython/frontend/html/notebook/static/css/notebook.css
+++ b/IPython/frontend/html/notebook/static/css/notebook.css
@@ -225,25 +225,42 @@ div.html_cell_render {
     color: black;
 }
 
-div.html_cell_render em {font-style: italic;}
-div.html_cell_render strong {font-weight: bold;}
-div.html_cell_render u {text-decoration: underline;}
-div.html_cell_render :link { text-decoration: underline }
-div.html_cell_render :visited { text-decoration: underline }
-div.html_cell_render h1 {font-size: 197%; margin: .67em 0; font-weight: bold;}
-div.html_cell_render h2 {font-size: 153.9%; margin: .75em 0; font-weight: bold;}
-div.html_cell_render h3 {font-size: 116%; margin: .83em 0; font-weight: bold;}
-div.html_cell_render h4 {margin: 1.12em 0; font-weight: bold;}
-div.html_cell_render h5 {font-size: 85%.; margin: 1.5em 0; font-weight: bold;}
-div.html_cell_render h6 {font-size: 77%; margin: 1.67em 0; font-weight: bold;}
-div.html_cell_render ul {list-style:disc; margin-left: 40px;}
-div.html_cell_render ul ul {list-style:square; margin-left: 40px;}
-div.html_cell_render ul ul ul {list-style:circle; margin-left: 40px;}
-div.html_cell_render ol {list-style:upper-roman; margin-left: 40px;}
-div.html_cell_render ol ol {list-style:upper-alpha;}
-div.html_cell_render ol ol ol {list-style:decimal;}
-div.html_cell_render ol ol ol ol {list-style:lower-alpha;}
-div.html_cell_render ol ol ol ol ol {list-style:lower-roman;}
+div.rst_cell_input {
+    color: black;
+}
+
+div.rst_cell_render {
+    font-family: "Helvetica Neue", Arial, Helvetica, Geneva, sans-serif;
+    /* Slightly bigger than the rest of the notebook */
+    font-size: 116%;
+    outline: none;
+    resize: none;
+    width:  inherit;
+    border-style: none;
+    padding: 5px;
+    color: black;
+}
+
+.rendered_html {color: black;}
+.rendered_html em {font-style: italic;}
+.rendered_html strong {font-weight: bold;}
+.rendered_html u {text-decoration: underline;}
+.rendered_html :link { text-decoration: underline }
+.rendered_html :visited { text-decoration: underline }
+.rendered_html h1 {font-size: 197%; margin: .67em 0; font-weight: bold;}
+.rendered_html h2 {font-size: 153.9%; margin: .75em 0; font-weight: bold;}
+.rendered_html h3 {font-size: 116%; margin: .83em 0; font-weight: bold;}
+.rendered_html h4 {margin: 1.12em 0; font-weight: bold;}
+.rendered_html h5 {font-size: 85%.; margin: 1.5em 0; font-weight: bold;}
+.rendered_html h6 {font-size: 77%; margin: 1.67em 0; font-weight: bold;}
+.rendered_html ul {list-style:disc; margin-left: 40px;}
+.rendered_html ul ul {list-style:square; margin-left: 40px;}
+.rendered_html ul ul ul {list-style:circle; margin-left: 40px;}
+.rendered_html ol {list-style:upper-roman; margin-left: 40px;}
+.rendered_html ol ol {list-style:upper-alpha;}
+.rendered_html ol ol ol {list-style:decimal;}
+.rendered_html ol ol ol ol {list-style:lower-alpha;}
+.rendered_html ol ol ol ol ol {list-style:lower-roman;}
 
 .CodeMirror {
   line-height: 1.231;  /* Changed from 1em to our global default */
diff --git a/IPython/frontend/html/notebook/static/js/htmlcell.js b/IPython/frontend/html/notebook/static/js/htmlcell.js
index 95590db..e084d43 100644
--- a/IPython/frontend/html/notebook/static/js/htmlcell.js
+++ b/IPython/frontend/html/notebook/static/js/htmlcell.js
@@ -28,7 +28,8 @@ var IPython = (function (IPython) {
             value: this.placeholder
         });
         // The tabindex=-1 makes this div focusable.
-        var render_area = $('<div/>').addClass('html_cell_render').attr('tabindex','-1');
+        var render_area = $('<div/>').addClass('html_cell_render').
+            addClass('rendered_html').attr('tabindex','-1');
         cell.append(input_area).append(render_area);
         this.element = cell;
     };
@@ -74,7 +75,7 @@ var IPython = (function (IPython) {
             var output = html_cell.find("div.html_cell_render");    
             var text = this.get_source();
             if (text === "") {text = this.placeholder;};
-            this.set_render(text);
+            this.set_rendered(text);
             MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
             html_cell.find('div.html_cell_input').hide();
             output.show();
@@ -107,7 +108,7 @@ var IPython = (function (IPython) {
     };
 
 
-    HTMLCell.prototype.set_render = function(text) {
+    HTMLCell.prototype.set_rendered = function(text) {
         this.element.find('div.html_cell_render').html(text);
     };
 
@@ -134,7 +135,7 @@ var IPython = (function (IPython) {
         if (data.cell_type === 'html') {
             if (data.source !== undefined) {
                 this.set_source(data.source);
-                this.set_render(data.source);
+                this.set_rendered(data.source);
             };
         };
     }
diff --git a/IPython/frontend/html/notebook/static/js/notebook.js b/IPython/frontend/html/notebook/static/js/notebook.js
index 859d00c..452bcb9 100644
--- a/IPython/frontend/html/notebook/static/js/notebook.js
+++ b/IPython/frontend/html/notebook/static/js/notebook.js
@@ -342,12 +342,34 @@ var IPython = (function (IPython) {
     }
 
 
-    Notebook.prototype.html_to_code = function (index) {
+    Notebook.prototype.insert_rst_cell_before = function (index) {
+        // TODO: Bounds check for i
+        var i = this.index_or_selected(index);
+        var cell = new IPython.RSTCell(this);
+        cell.config_mathjax();
+        this.insert_cell_before(cell, i);
+        this.select(this.find_cell_index(cell));
+        return cell;
+    }
+
+
+    Notebook.prototype.insert_rst_cell_after = function (index) {
+        // TODO: Bounds check for i
+        var i = this.index_or_selected(index);
+        var cell = new IPython.RSTCell(this);
+        cell.config_mathjax();
+        this.insert_cell_after(cell, i);
+        this.select(this.find_cell_index(cell));
+        return cell;
+    }
+
+
+    Notebook.prototype.to_code = function (index) {
         // TODO: Bounds check for i
         var i = this.index_or_selected(index);
         var source_element = this.cell_elements().eq(i);
         var source_cell = source_element.data("cell");
-        if (source_cell instanceof IPython.HTMLCell) {
+        if (source_cell instanceof IPython.HTMLCell || source_cell instanceof IPython.RSTCell) {
             this.insert_code_cell_after(i);
             var target_cell = this.cells()[i+1];
             target_cell.set_code(source_cell.get_source());
@@ -356,21 +378,51 @@ var IPython = (function (IPython) {
     };
 
 
-    Notebook.prototype.code_to_html = function (index) {
+    Notebook.prototype.to_rst = function (index) {
+        // TODO: Bounds check for i
+        var i = this.index_or_selected(index);
+        var source_element = this.cell_elements().eq(i);
+        var source_cell = source_element.data("cell");
+        var target_cell = null;
+        if (source_cell instanceof IPython.CodeCell) {
+            this.insert_rst_cell_after(i);
+            var target_cell = this.cells()[i+1];
+            var text = source_cell.get_code();
+        } else if (source_cell instanceof IPython.HTMLCell) {
+            this.insert_rst_cell_after(i);
+            var target_cell = this.cells()[i+1];
+            var text = source_cell.get_source();
+        }
+        if (target_cell !== null) {
+            if (text === "") {text = target_cell.placeholder;};
+            target_cell.set_source(text);
+            source_element.remove();
+            target_cell.edit();
+        }
+    };
+
+
+    Notebook.prototype.to_html = function (index) {
         // TODO: Bounds check for i
         var i = this.index_or_selected(index);
         var source_element = this.cell_elements().eq(i);
         var source_cell = source_element.data("cell");
+        var target_cell = null;
         if (source_cell instanceof IPython.CodeCell) {
             this.insert_html_cell_after(i);
             var target_cell = this.cells()[i+1];
             var text = source_cell.get_code();
+        } else if (source_cell instanceof IPython.RSTCell) {
+            this.insert_html_cell_after(i);
+            var target_cell = this.cells()[i+1];
+            var text = source_cell.get_source();
+        }
+        if (target_cell !== null) {
             if (text === "") {text = target_cell.placeholder;};
             target_cell.set_source(text);
-            target_cell.set_render(text);
             source_element.remove();
             target_cell.edit();
-        };
+        }
     };
 
 
diff --git a/IPython/frontend/html/notebook/static/js/notebook_main.js b/IPython/frontend/html/notebook/static/js/notebook_main.js
index 0722c70..8a7e386 100644
--- a/IPython/frontend/html/notebook/static/js/notebook_main.js
+++ b/IPython/frontend/html/notebook/static/js/notebook_main.js
@@ -16,6 +16,7 @@ $(document).ready(function () {
             styles: {'.MathJax_Display': {"margin": 0}}
         }
     });
+    IPython.markdown_converter = new Markdown.Converter();
 
     $('div#header').addClass('border-box-sizing');
     $('div#main_app').addClass('border-box-sizing ui-widget ui-widget-content');
diff --git a/IPython/frontend/html/notebook/static/js/panelsection.js b/IPython/frontend/html/notebook/static/js/panelsection.js
index d1374ae..a197961 100644
--- a/IPython/frontend/html/notebook/static/js/panelsection.js
+++ b/IPython/frontend/html/notebook/static/js/panelsection.js
@@ -153,10 +153,13 @@ var IPython = (function (IPython) {
             IPython.notebook.move_cell_down();
         });
         this.content.find('#to_code').click(function () {
-            IPython.notebook.html_to_code();
+            IPython.notebook.to_code();
         });
         this.content.find('#to_html').click(function () {
-            IPython.notebook.code_to_html();
+            IPython.notebook.to_html();
+        });
+        this.content.find('#to_rst').click(function () {
+            IPython.notebook.to_rst();
         });
         this.content.find('#run_selected_cell').click(function () {
             IPython.notebook.execute_selected_cell();
diff --git a/IPython/frontend/html/notebook/static/js/rstcell.js b/IPython/frontend/html/notebook/static/js/rstcell.js
new file mode 100644
index 0000000..5e7d612
--- /dev/null
+++ b/IPython/frontend/html/notebook/static/js/rstcell.js
@@ -0,0 +1,187 @@
+
+//============================================================================
+// RSTCell
+//============================================================================
+
+var IPython = (function (IPython) {
+
+    var RSTCell = function (notebook) {
+        IPython.Cell.apply(this, arguments);
+        this.placeholder = "Type ReStructured Text *here*."
+        this.rendered = false;
+    };
+
+
+    RSTCell.prototype = new IPython.Cell();
+
+
+
+    RSTCell.prototype.create_element = function () {
+        var cell = $("<div>").addClass('cell rst_cell border-box-sizing');
+        var input_area = $('<div/>').addClass('rst_cell_input');
+        this.code_mirror = CodeMirror(input_area.get(0), {
+            indentUnit : 4,
+            enterMode : 'flat',
+            tabMode: 'shift',
+            mode: 'rst',
+            theme: 'default',
+            value: this.placeholder
+        });
+        // The tabindex=-1 makes this div focusable.
+        var render_area = $('<div/>').addClass('rst_cell_render').
+            addClass('rendered_html').attr('tabindex','-1');
+        cell.append(input_area).append(render_area);
+        this.element = cell;
+    };
+
+
+    RSTCell.prototype.bind_events = function () {
+        IPython.Cell.prototype.bind_events.apply(this);
+        var that = this;
+        this.element.keydown(function (event) {
+            if (event.which === 13) {
+                if (that.rendered) {
+                    that.edit();
+                    event.preventDefault();
+                };
+            };
+        });
+    };
+
+
+    RSTCell.prototype.select = function () {
+        IPython.Cell.prototype.select.apply(this);
+        var output = this.element.find("div.rst_cell_render");
+        output.trigger('focus');
+    };
+
+
+    RSTCell.prototype.edit = function () {
+        if (this.rendered === true) {
+            var rst_cell = this.element;
+            var output = rst_cell.find("div.rst_cell_render");  
+            output.hide();
+            rst_cell.find('div.rst_cell_input').show();
+            this.code_mirror.focus();
+            this.code_mirror.refresh();
+            this.rendered = false;
+        };
+    };
+
+
+    RSTCell.prototype.render = function () {
+        if (this.rendered === false) {
+            var text = this.get_source();
+            if (text === '') {text = this.placeholder;};
+            var html = IPython.markdown_converter.makeHtml(text);
+            this.set_rendered(html);
+            MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
+            this.element.find('div.rst_cell_input').hide();
+            this.element.find("div.rst_cell_render").show();
+            this.rendered = true;
+        };
+    };
+
+
+    RSTCell.prototype.render_rst = function () {
+        if (this.rendered === false) {  
+            var text = this.get_source();
+            if (text === "") {text = this.placeholder;};
+            var settings = {
+                processData : false,
+                cache : false,
+                type : "POST",
+                data : text,
+                headers : {'Content-Type': 'application/x-rst'},
+                success : $.proxy(this.handle_rendered,this)
+            };
+            $.ajax("/rstservice/render", settings);
+        };
+    };
+
+
+    RSTCell.prototype.handle_rendered = function (data, status, xhr) {
+        this.set_rendered(data);
+        MathJax.Hub.Queue(["Typeset",MathJax.Hub]);
+        this.element.find('div.rst_cell_input').hide();
+        this.element.find("div.rst_cell_render").show();
+        this.rendered = true;
+    };
+
+
+    RSTCell.prototype.config_mathjax = function () {
+        var rst_cell = this.element;
+        var that = this;
+        rst_cell.click(function () {
+            that.edit();
+        }).focusout(function () {
+            that.render();
+        });
+        
+        rst_cell.trigger("focusout");
+    };
+
+
+    RSTCell.prototype.get_source = function () {
+        return this.code_mirror.getValue();
+    };
+
+
+    RSTCell.prototype.set_source = function (text) {
+        this.code_mirror.setValue(text);
+        this.code_mirror.refresh();
+    };
+
+
+    RSTCell.prototype.set_rendered = function (text) {
+        this.element.find('div.rst_cell_render').html(text);
+    };
+
+
+    RSTCell.prototype.get_rendered = function () {
+        return this.element.find('div.rst_cell_render').html();
+    };
+
+
+    RSTCell.prototype.at_top = function () {
+        if (this.rendered) {
+            return true;
+        } else {
+            return false;
+        }
+    };
+
+
+    RSTCell.prototype.at_bottom = function () {
+        if (this.rendered) {
+            return true;
+        } else {
+            return false;
+        }
+    };
+
+
+    RSTCell.prototype.fromJSON = function (data) {
+        if (data.cell_type === 'rst') {
+            if (data.source !== undefined) {
+                this.set_source(data.source);
+                this.set_rendered(data.rendered);
+            };
+        };
+    }
+
+
+    RSTCell.prototype.toJSON = function () {
+        var data = {}
+        data.cell_type = 'rst';
+        data.source = this.get_source();
+        data.rendered = this.get_rendered();
+        return data;
+    };
+
+    IPython.RSTCell = RSTCell;
+
+    return IPython;
+
+}(IPython));
+
diff --git a/IPython/frontend/html/notebook/static/pagedown/LICENSE.txt b/IPython/frontend/html/notebook/static/pagedown/LICENSE.txt
new file mode 100644
index 0000000..ca48b4f
--- /dev/null
+++ b/IPython/frontend/html/notebook/static/pagedown/LICENSE.txt
@@ -0,0 +1,32 @@
+A javascript port of Markdown, as used on Stack Overflow
+and the rest of Stack Exchange network.
+
+Largely based on showdown.js by John Fraser (Attacklab).
+
+Original Markdown Copyright (c) 2004-2005 John Gruber
+  <http://daringfireball.net/projects/markdown/>
+
+
+Original Showdown code copyright (c) 2007 John Fraser
+
+Modifications and bugfixes (c) 2009 Dana Robinson
+Modifications and bugfixes (c) 2009-2011 Stack Exchange Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
diff --git a/IPython/frontend/html/notebook/static/pagedown/Markdown.Converter.js b/IPython/frontend/html/notebook/static/pagedown/Markdown.Converter.js
new file mode 100644
index 0000000..9a1a4f7
--- /dev/null
+++ b/IPython/frontend/html/notebook/static/pagedown/Markdown.Converter.js
@@ -0,0 +1,1318 @@
+var Markdown;
+
+if (typeof exports === "object" && typeof require === "function") // we're in a CommonJS (e.g. Node.js) module
+    Markdown = exports;
+else
+    Markdown = {};
+    
+// The following text is included for historical reasons, but should
+// be taken with a pinch of salt; it's not all true anymore.
+
+//
+// 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.
+//
+
+
+//
+// Usage:
+//
+//   var text = "Markdown *rocks*.";
+//
+//   var converter = new Markdown.Converter();
+//   var html = converter.makeHtml(text);
+//
+//   alert(html);
+//
+// Note: move the sample code to the bottom of this
+// file before uncommenting it.
+//
+
+(function () {
+
+    function identity(x) { return x; }
+    function returnFalse(x) { return false; }
+
+    function HookCollection() { }
+
+    HookCollection.prototype = {
+
+        chain: function (hookname, func) {
+            var original = this[hookname];
+            if (!original)
+                throw new Error("unknown hook " + hookname);
+
+            if (original === identity)
+                this[hookname] = func;
+            else
+                this[hookname] = function (x) { return func(original(x)); }
+        },
+        set: function (hookname, func) {
+            if (!this[hookname])
+                throw new Error("unknown hook " + hookname);
+            this[hookname] = func;
+        },
+        addNoop: function (hookname) {
+            this[hookname] = identity;
+        },
+        addFalse: function (hookname) {
+            this[hookname] = returnFalse;
+        }
+    };
+
+    Markdown.HookCollection = HookCollection;
+
+    // g_urls and g_titles allow arbitrary user-entered strings as keys. This
+    // caused an exception (and hence stopped the rendering) when the user entered
+    // e.g. [push] or [__proto__]. Adding a prefix to the actual key prevents this
+    // (since no builtin property starts with "s_"). See
+    // http://meta.stackoverflow.com/questions/64655/strange-wmd-bug
+    // (granted, switching from Array() to Object() alone would have left only __proto__
+    // to be a problem)
+    function SaveHash() { }
+    SaveHash.prototype = {
+        set: function (key, value) {
+            this["s_" + key] = value;
+        },
+        get: function (key) {
+            return this["s_" + key];
+        }
+    };
+
+    Markdown.Converter = function () {
+        var pluginHooks = this.hooks = new HookCollection();
+        pluginHooks.addNoop("plainLinkText");  // given a URL that was encountered by itself (without markup), should return the link text that's to be given to this link
+        pluginHooks.addNoop("preConversion");  // called with the orignal text as given to makeHtml. The result of this plugin hook is the actual markdown source that will be cooked
+        pluginHooks.addNoop("postConversion"); // called with the final cooked HTML code. The result of this plugin hook is the actual output of makeHtml
+
+        //
+        // Private state of the converter instance:
+        //
+
+        // Global hashes, used by various utility routines
+        var g_urls;
+        var g_titles;
+        var g_html_blocks;
+
+        // Used to track when we're inside an ordered or unordered list
+        // (see _ProcessListItems() for details):
+        var g_list_level;
+
+        this.makeHtml = function (text) {
+
+            //
+            // Main function. The order in which other subs are called here is
+            // essential. Link and image substitutions need to happen before
+            // _EscapeSpecialCharsWithinTagAttributes(), so that any *'s or _'s in the <a>
+            // and <img> tags get encoded.
+            //
+
+            // This will only happen if makeHtml on the same converter instance is called from a plugin hook.
+            // Don't do that.
+            if (g_urls)
+                throw new Error("Recursive call to converter.makeHtml");
+        
+            // Create the private state objects.
+            g_urls = new SaveHash();
+            g_titles = new SaveHash();
+            g_html_blocks = [];
+            g_list_level = 0;
+
+            text = pluginHooks.preConversion(text);
+
+            // attacklab: Replace ~ with ~T
+            // This lets us use tilde as an escape char to avoid md5 hashes
+            // The choice of character is arbitray; anything that isn't
+            // magic in Markdown will work.
+            text = text.replace(/~/g, "~T");
+
+            // attacklab: Replace $ with ~D
+            // RegExp interprets $ as a special character
+            // when it's in a replacement string
+            text = text.replace(/\$/g, "~D");
+
+            // Standardize line endings
+            text = text.replace(/\r\n/g, "\n"); // DOS to Unix
+            text = text.replace(/\r/g, "\n"); // Mac to Unix
+
+            // Make sure text begins and ends with a couple of newlines:
+            text = "\n\n" + text + "\n\n";
+
+            // Convert all tabs to spaces.
+            text = _Detab(text);
+
+            // Strip any lines consisting only of spaces and tabs.
+            // This makes subsequent regexen easier to write, because we can
+            // match consecutive blank lines with /\n+/ instead of something
+            // contorted like /[ \t]*\n+/ .
+            text = text.replace(/^[ \t]+$/mg, "");
+
+            // Turn block-level HTML blocks into hash entries
+            text = _HashHTMLBlocks(text);
+
+            // Strip link definitions, store in hashes.
+            text = _StripLinkDefinitions(text);
+
+            text = _RunBlockGamut(text);
+
+            text = _UnescapeSpecialChars(text);
+
+            // attacklab: Restore dollar signs
+            text = text.replace(/~D/g, "$$");
+
+            // attacklab: Restore tildes
+            text = text.replace(/~T/g, "~");
+
+            text = pluginHooks.postConversion(text);
+
+            g_html_blocks = g_titles = g_urls = null;
+
+            return text;
+        };
+
+        function _StripLinkDefinitions(text) {
+            //
+            // Strips link definitions from text, stores the URLs and titles in
+            // hash references.
+            //
+
+            // Link defs are in the form: ^[id]: url "optional title"
+
+            /*
+            text = text.replace(/
+                ^[ ]{0,3}\[(.+)\]:  // id = $1  attacklab: g_tab_width - 1
+                [ \t]*
+                \n?                 // maybe *one* newline
+                [ \t]*
+                <?(\S+?)>?          // url = $2
+                (?=\s|$)            // lookahead for whitespace instead of the lookbehind removed below
+                [ \t]*
+                \n?                 // maybe one newline
+                [ \t]*
+                (                   // (potential) title = $3
+                    (\n*)           // any lines skipped = $4 attacklab: lookbehind removed
+                    [ \t]+
+                    ["(]
+                    (.+?)           // title = $5
+                    [")]
+                    [ \t]*
+                )?                  // title is optional
+                (?:\n+|$)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/^[ ]{0,3}\[(.+)\]:[ \t]*\n?[ \t]*<?(\S+?)>?(?=\s|$)[ \t]*\n?[ \t]*((\n*)["(](.+?)[")][ \t]*)?(?:\n+)/gm,
+                function (wholeMatch, m1, m2, m3, m4, m5) {
+                    m1 = m1.toLowerCase();
+                    g_urls.set(m1, _EncodeAmpsAndAngles(m2));  // Link IDs are case-insensitive
+                    if (m4) {
+                        // Oops, found blank lines, so it's not a title.
+                        // Put back the parenthetical statement we stole.
+                        return m3;
+                    } else if (m5) {
+                        g_titles.set(m1, m5.replace(/"/g, "&quot;"));
+                    }
+
+                    // Completely remove the definition from the text
+                    return "";
+                }
+            );
+
+            return text;
+        }
+
+        function _HashHTMLBlocks(text) {
+
+            // Hashify HTML blocks:
+            // We only want to do this for block-level HTML tags, such as headers,
+            // lists, and tables. That's because we still want to wrap <p>s around
+            // "paragraphs" that are wrapped in non-block-level tags, such as anchors,
+            // phrase emphasis, and spans. The list of tags we're looking for is
+            // hard-coded:
+            var block_tags_a = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math|ins|del"
+            var block_tags_b = "p|div|h[1-6]|blockquote|pre|table|dl|ol|ul|script|noscript|form|fieldset|iframe|math"
+
+            // First, look for nested blocks, e.g.:
+            //   <div>
+            //     <div>
+            //     tags for inner block must be indented.
+            //     </div>
+            //   </div>
+            //
+            // The outermost tags must start at the left margin for this to match, and
+            // the inner nested divs must be indented.
+            // We need to do this before the next, more liberal match, because the next
+            // match will start at the first `<div>` and stop at the first `</div>`.
+
+            // attacklab: This regex can be expensive when it fails.
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_a)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?\n           // any number of lines, minimally matching
+                    </\2>               // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            text = text.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, hashElement);
+
+            //
+            // Now match more liberally, simply from `\n<tag>` to `</tag>\n`
+            //
+
+            /*
+            text = text.replace(/
+                (                       // save in $1
+                    ^                   // start of line  (with /m)
+                    <($block_tags_b)    // start tag = $2
+                    \b                  // word break
+                                        // attacklab: hack around khtml/pcre bug...
+                    [^\r]*?             // any number of lines, minimally matching
+                    .*</\2>             // the matching end tag
+                    [ \t]*              // trailing spaces/tabs
+                    (?=\n+)             // followed by a newline
+                )                       // attacklab: there are sentinel newlines at end of document
+            /gm,function(){...}};
+            */
+            text = text.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, hashElement);
+
+            // Special case just for <hr />. It was easier to make a special case than
+            // to make the other regex more complicated.  
+
+            /*
+            text = text.replace(/
+                \n                  // Starting after a blank line
+                [ ]{0,3}
+                (                   // save in $1
+                    (<(hr)          // start tag = $2
+                        \b          // word break
+                        ([^<>])*?
+                    \/?>)           // the matching end tag
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/\n[ ]{0,3}((<(hr)\b([^<>])*?\/?>)[ \t]*(?=\n{2,}))/g, hashElement);
+
+            // Special case for standalone HTML comments:
+
+            /*
+            text = text.replace(/
+                \n\n                                            // Starting after a blank line
+                [ ]{0,3}                                        // attacklab: g_tab_width - 1
+                (                                               // save in $1
+                    <!
+                    (--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)   // see http://www.w3.org/TR/html-markup/syntax.html#comments and http://meta.stackoverflow.com/q/95256
+                    >
+                    [ \t]*
+                    (?=\n{2,})                                  // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/\n\n[ ]{0,3}(<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>[ \t]*(?=\n{2,}))/g, hashElement);
+
+            // PHP and ASP-style processor instructions (<?...?> and <%...%>)
+
+            /*
+            text = text.replace(/
+                (?:
+                    \n\n            // Starting after a blank line
+                )
+                (                   // save in $1
+                    [ ]{0,3}        // attacklab: g_tab_width - 1
+                    (?:
+                        <([?%])     // $2
+                        [^\r]*?
+                        \2>
+                    )
+                    [ \t]*
+                    (?=\n{2,})      // followed by a blank line
+                )
+            /g,hashElement);
+            */
+            text = text.replace(/(?:\n\n)([ ]{0,3}(?:<([?%])[^\r]*?\2>)[ \t]*(?=\n{2,}))/g, hashElement);
+
+            return text;
+        }
+
+        function hashElement(wholeMatch, m1) {
+            var blockText = m1;
+
+            // Undo double lines
+            blockText = blockText.replace(/^\n+/, "");
+
+            // strip trailing blank lines
+            blockText = blockText.replace(/\n+$/g, "");
+
+            // Replace the element text with a marker ("~KxK" where x is its key)
+            blockText = "\n\n~K" + (g_html_blocks.push(blockText) - 1) + "K\n\n";
+
+            return blockText;
+        }
+
+        function _RunBlockGamut(text, doNotUnhash) {
+            //
+            // These are all the transformations that form block-level
+            // tags like paragraphs, headers, and list items.
+            //
+            text = _DoHeaders(text);
+
+            // Do Horizontal Rules:
+            var replacement = "<hr />\n";
+            text = text.replace(/^[ ]{0,2}([ ]?\*[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?-[ ]?){3,}[ \t]*$/gm, replacement);
+            text = text.replace(/^[ ]{0,2}([ ]?_[ ]?){3,}[ \t]*$/gm, replacement);
+
+            text = _DoLists(text);
+            text = _DoCodeBlocks(text);
+            text = _DoBlockQuotes(text);
+
+            // We already ran _HashHTMLBlocks() before, in Markdown(), but that
+            // was to escape raw HTML in the original Markdown source. This time,
+            // we're escaping the markup we've just created, so that we don't wrap
+            // <p> tags around block-level tags.
+            text = _HashHTMLBlocks(text);
+            text = _FormParagraphs(text, doNotUnhash);
+
+            return text;
+        }
+
+        function _RunSpanGamut(text) {
+            //
+            // These are all the transformations that occur *within* block-level
+            // tags like paragraphs, headers, and list items.
+            //
+
+            text = _DoCodeSpans(text);
+            text = _EscapeSpecialCharsWithinTagAttributes(text);
+            text = _EncodeBackslashEscapes(text);
+
+            // Process anchor and image tags. Images must come first,
+            // because ![foo][f] looks like an anchor.
+            text = _DoImages(text);
+            text = _DoAnchors(text);
+
+            // Make links out of things like `<http://example.com/>`
+            // Must come after _DoAnchors(), because you can use < and >
+            // delimiters in inline links like [this](<url>).
+            text = _DoAutoLinks(text);
+            text = _EncodeAmpsAndAngles(text);
+            text = _DoItalicsAndBold(text);
+
+            // Do hard breaks:
+            text = text.replace(/  +\n/g, " <br>\n");
+
+            return text;
+        }
+
+        function _EscapeSpecialCharsWithinTagAttributes(text) {
+            //
+            // Within tags -- meaning between < and > -- encode [\ ` * _] so they
+            // don't conflict with their use in Markdown for code, italics and strong.
+            //
+
+            // Build a regex to find HTML tags and comments.  See Friedl's 
+            // "Mastering Regular Expressions", 2nd Ed., pp. 200-201.
+
+            // SE: changed the comment part of the regex
+
+            var regex = /(<[a-z\/!$]("[^"]*"|'[^']*'|[^'">])*>|<!(--(?:|(?:[^>-]|-[^>])(?:[^-]|-[^-])*)--)>)/gi;
+
+            text = text.replace(regex, function (wholeMatch) {
+                var tag = wholeMatch.replace(/(.)<\/?code>(?=.)/g, "$1`");
+                tag = escapeCharacters(tag, wholeMatch.charAt(1) == "!" ? "\\`*_/" : "\\`*_"); // also escape slashes in comments to prevent autolinking there -- http://meta.stackoverflow.com/questions/95987
+                return tag;
+            });
+
+            return text;
+        }
+
+        function _DoAnchors(text) {
+            //
+            // Turn Markdown link shortcuts into XHTML <a> tags.
+            //
+            //
+            // First, handle reference-style links: [link text] [id]
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[]           // or anything else
+                        )*
+                    )
+                    \]
+
+                    [ ]?                    // one optional space
+                    (?:\n[ ]*)?             // one optional newline followed by spaces
+
+                    \[
+                    (.*?)                   // id = $3
+                    \]
+                )
+                ()()()()                    // pad remaining backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeAnchorTag);
+
+            //
+            // Next, inline-style links: [link text](url "optional title")
+            //
+
+            /*
+            text = text.replace(/
+                (                           // wrap whole match in $1
+                    \[
+                    (
+                        (?:
+                            \[[^\]]*\]      // allow brackets nested one level
+                            |
+                            [^\[\]]         // or anything else
+                        )*
+                    )
+                    \]
+                    \(                      // literal paren
+                    [ \t]*
+                    ()                      // no id, so leave $3 empty
+                    <?(                     // href = $4
+                        (?:
+                            \([^)]*\)       // allow one level of (correctly nested) parens (think MSDN)
+                            |
+                            [^()]
+                        )*?
+                    )>?                
+                    [ \t]*
+                    (                       // $5
+                        (['"])              // quote char = $6
+                        (.*?)               // Title = $7
+                        \6                  // matching quote
+                        [ \t]*              // ignore any spaces/tabs between closing quote and )
+                    )?                      // title is optional
+                    \)
+                )
+            /g, writeAnchorTag);
+            */
+
+            text = text.replace(/(\[((?:\[[^\]]*\]|[^\[\]])*)\]\([ \t]*()<?((?:\([^)]*\)|[^()])*?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeAnchorTag);
+
+            //
+            // Last, handle reference-style shortcuts: [link text]
+            // These must come last in case you've also got [link test][1]
+            // or [link test](/foo)
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    \[
+                    ([^\[\]]+)      // link text = $2; can't contain '[' or ']'
+                    \]
+                )
+                ()()()()()          // pad rest of backreferences
+            /g, writeAnchorTag);
+            */
+            text = text.replace(/(\[([^\[\]]+)\])()()()()()/g, writeAnchorTag);
+
+            return text;
+        }
+
+        function writeAnchorTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
+            if (m7 == undefined) m7 = "";
+            var whole_match = m1;
+            var link_text = m2;
+            var link_id = m3.toLowerCase();
+            var url = m4;
+            var title = m7;
+
+            if (url == "") {
+                if (link_id == "") {
+                    // lower-case and turn embedded newlines into spaces
+                    link_id = link_text.toLowerCase().replace(/ ?\n/g, " ");
+                }
+                url = "#" + link_id;
+
+                if (g_urls.get(link_id) != undefined) {
+                    url = g_urls.get(link_id);
+                    if (g_titles.get(link_id) != undefined) {
+                        title = g_titles.get(link_id);
+                    }
+                }
+                else {
+                    if (whole_match.search(/\(\s*\)$/m) > -1) {
+                        // Special case for explicit empty url
+                        url = "";
+                    } else {
+                        return whole_match;
+                    }
+                }
+            }
+            url = encodeProblemUrlChars(url);
+            url = escapeCharacters(url, "*_");
+            var result = "<a href=\"" + url + "\"";
+
+            if (title != "") {
+                title = title.replace(/"/g, "&quot;");
+                title = escapeCharacters(title, "*_");
+                result += " title=\"" + title + "\"";
+            }
+
+            result += ">" + link_text + "</a>";
+
+            return result;
+        }
+
+        function _DoImages(text) {
+            //
+            // Turn Markdown image shortcuts into <img> tags.
+            //
+
+            //
+            // First, handle reference-style labeled images: ![alt text][id]
+            //
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+
+                    [ ]?            // one optional space
+                    (?:\n[ ]*)?     // one optional newline followed by spaces
+
+                    \[
+                    (.*?)           // id = $3
+                    \]
+                )
+                ()()()()            // pad rest of backreferences
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\][ ]?(?:\n[ ]*)?\[(.*?)\])()()()()/g, writeImageTag);
+
+            //
+            // Next, handle inline images:  ![alt text](url "optional title")
+            // Don't forget: encode * and _
+
+            /*
+            text = text.replace(/
+                (                   // wrap whole match in $1
+                    !\[
+                    (.*?)           // alt text = $2
+                    \]
+                    \s?             // One optional whitespace character
+                    \(              // literal paren
+                    [ \t]*
+                    ()              // no id, so leave $3 empty
+                    <?(\S+?)>?      // src url = $4
+                    [ \t]*
+                    (               // $5
+                        (['"])      // quote char = $6
+                        (.*?)       // title = $7
+                        \6          // matching quote
+                        [ \t]*
+                    )?              // title is optional
+                    \)
+                )
+            /g, writeImageTag);
+            */
+            text = text.replace(/(!\[(.*?)\]\s?\([ \t]*()<?(\S+?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g, writeImageTag);
+
+            return text;
+        }
+
+        function writeImageTag(wholeMatch, m1, m2, m3, m4, m5, m6, m7) {
+            var whole_match = m1;
+            var alt_text = m2;
+            var link_id = m3.toLowerCase();
+            var url = m4;
+            var title = m7;
+
+            if (!title) title = "";
+
+            if (url == "") {
+                if (link_id == "") {
+                    // lower-case and turn embedded newlines into spaces
+                    link_id = alt_text.toLowerCase().replace(/ ?\n/g, " ");
+                }
+                url = "#" + link_id;
+
+                if (g_urls.get(link_id) != undefined) {
+                    url = g_urls.get(link_id);
+                    if (g_titles.get(link_id) != undefined) {
+                        title = g_titles.get(link_id);
+                    }
+                }
+                else {
+                    return whole_match;
+                }
+            }
+
+            alt_text = alt_text.replace(/"/g, "&quot;");
+            url = escapeCharacters(url, "*_");
+            var result = "<img src=\"" + url + "\" alt=\"" + alt_text + "\"";
+
+            // attacklab: Markdown.pl adds empty title attributes to images.
+            // Replicate this bug.
+
+            //if (title != "") {
+            title = title.replace(/"/g, "&quot;");
+            title = escapeCharacters(title, "*_");
+            result += " title=\"" + title + "\"";
+            //}
+
+            result += " />";
+
+            return result;
+        }
+
+        function _DoHeaders(text) {
+
+            // Setext-style headers:
+            //  Header 1
+            //  ========
+            //  
+            //  Header 2
+            //  --------
+            //
+            text = text.replace(/^(.+)[ \t]*\n=+[ \t]*\n+/gm,
+                function (wholeMatch, m1) { return "<h1>" + _RunSpanGamut(m1) + "</h1>\n\n"; }
+            );
+
+            text = text.replace(/^(.+)[ \t]*\n-+[ \t]*\n+/gm,
+                function (matchFound, m1) { return "<h2>" + _RunSpanGamut(m1) + "</h2>\n\n"; }
+            );
+
+            // atx-style headers:
+            //  # Header 1
+            //  ## Header 2
+            //  ## Header 2 with closing hashes ##
+            //  ...
+            //  ###### Header 6
+            //
+
+            /*
+            text = text.replace(/
+                ^(\#{1,6})      // $1 = string of #'s
+                [ \t]*
+                (.+?)           // $2 = Header text
+                [ \t]*
+                \#*             // optional closing #'s (not counted)
+                \n+
+            /gm, function() {...});
+            */
+
+            text = text.replace(/^(\#{1,6})[ \t]*(.+?)[ \t]*\#*\n+/gm,
+                function (wholeMatch, m1, m2) {
+                    var h_level = m1.length;
+                    return "<h" + h_level + ">" + _RunSpanGamut(m2) + "</h" + h_level + ">\n\n";
+                }
+            );
+
+            return text;
+        }
+
+        function _DoLists(text) {
+            //
+            // Form HTML ordered (numbered) and unordered (bulleted) lists.
+            //
+
+            // attacklab: add sentinel to hack around khtml/safari bug:
+            // http://bugs.webkit.org/show_bug.cgi?id=11231
+            text += "~0";
+
+            // Re-usable pattern to match any entirel ul or ol list:
+
+            /*
+            var whole_list = /
+                (                                   // $1 = whole list
+                    (                               // $2
+                        [ ]{0,3}                    // attacklab: g_tab_width - 1
+                        ([*+-]|\d+[.])              // $3 = first list item marker
+                        [ \t]+
+                    )
+                    [^\r]+?
+                    (                               // $4
+                        ~0                          // sentinel for workaround; should be $
+                        |
+                        \n{2,}
+                        (?=\S)
+                        (?!                         // Negative lookahead for another list item marker
+                            [ \t]*
+                            (?:[*+-]|\d+[.])[ \t]+
+                        )
+                    )
+                )
+            /g
+            */
+            var whole_list = /^(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/gm;
+
+            if (g_list_level) {
+                text = text.replace(whole_list, function (wholeMatch, m1, m2) {
+                    var list = m1;
+                    var list_type = (m2.search(/[*+-]/g) > -1) ? "ul" : "ol";
+
+                    var result = _ProcessListItems(list, list_type);
+
+                    // Trim any trailing whitespace, to put the closing `</$list_type>`
+                    // up on the preceding line, to get it past the current stupid
+                    // HTML block parser. This is a hack to work around the terrible
+                    // hack that is the HTML block parser.
+                    result = result.replace(/\s+$/, "");
+                    result = "<" + list_type + ">" + result + "</" + list_type + ">\n";
+                    return result;
+                });
+            } else {
+                whole_list = /(\n\n|^\n?)(([ ]{0,3}([*+-]|\d+[.])[ \t]+)[^\r]+?(~0|\n{2,}(?=\S)(?![ \t]*(?:[*+-]|\d+[.])[ \t]+)))/g;
+                text = text.replace(whole_list, function (wholeMatch, m1, m2, m3) {
+                    var runup = m1;
+                    var list = m2;
+
+                    var list_type = (m3.search(/[*+-]/g) > -1) ? "ul" : "ol";
+                    var result = _ProcessListItems(list, list_type);
+                    result = runup + "<" + list_type + ">\n" + result + "</" + list_type + ">\n";
+                    return result;
+                });
+            }
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        var _listItemMarkers = { ol: "\\d+[.]", ul: "[*+-]" };
+
+        function _ProcessListItems(list_str, list_type) {
+            //
+            //  Process the contents of a single ordered or unordered list, splitting it
+            //  into individual list items.
+            //
+            //  list_type is either "ul" or "ol".
+
+            // The $g_list_level global keeps track of when we're inside a list.
+            // Each time we enter a list, we increment it; when we leave a list,
+            // we decrement. If it's zero, we're not in a list anymore.
+            //
+            // We do this because when we're not inside a list, we want to treat
+            // something like this:
+            //
+            //    I recommend upgrading to version
+            //    8. Oops, now this line is treated
+            //    as a sub-list.
+            //
+            // As a single paragraph, despite the fact that the second line starts
+            // with a digit-period-space sequence.
+            //
+            // Whereas when we're inside a list (or sub-list), that line will be
+            // treated as the start of a sub-list. What a kludge, huh? This is
+            // an aspect of Markdown's syntax that's hard to parse perfectly
+            // without resorting to mind-reading. Perhaps the solution is to
+            // change the syntax rules such that sub-lists must start with a
+            // starting cardinal number; e.g. "1." or "a.".
+
+            g_list_level++;
+
+            // trim trailing blank lines:
+            list_str = list_str.replace(/\n{2,}$/, "\n");
+
+            // attacklab: add sentinel to emulate \z
+            list_str += "~0";
+
+            // In the original attacklab showdown, list_type was not given to this function, and anything
+            // that matched /[*+-]|\d+[.]/ would just create the next <li>, causing this mismatch:
+            //
+            //  Markdown          rendered by WMD        rendered by MarkdownSharp
+            //  ------------------------------------------------------------------
+            //  1. first          1. first               1. first
+            //  2. second         2. second              2. second
+            //  - third           3. third                   * third
+            //
+            // We changed this to behave identical to MarkdownSharp. This is the constructed RegEx,
+            // with {MARKER} being one of \d+[.] or [*+-], depending on list_type:
+        
+            /*
+            list_str = list_str.replace(/
+                (^[ \t]*)                       // leading whitespace = $1
+                ({MARKER}) [ \t]+               // list marker = $2
+                ([^\r]+?                        // list item text   = $3
+                    (\n+)
+                )
+                (?=
+                    (~0 | \2 ({MARKER}) [ \t]+)
+                )
+            /gm, function(){...});
+            */
+
+            var marker = _listItemMarkers[list_type];
+            var re = new RegExp("(^[ \\t]*)(" + marker + ")[ \\t]+([^\\r]+?(\\n+))(?=(~0|\\1(" + marker + ")[ \\t]+))", "gm");
+            var last_item_had_a_double_newline = false;
+            list_str = list_str.replace(re,
+                function (wholeMatch, m1, m2, m3) {
+                    var item = m3;
+                    var leading_space = m1;
+                    var ends_with_double_newline = /\n\n$/.test(item);
+                    var contains_double_newline = ends_with_double_newline || item.search(/\n{2,}/) > -1;
+
+                    if (contains_double_newline || last_item_had_a_double_newline) {
+                        item = _RunBlockGamut(_Outdent(item), /* doNotUnhash = */true);
+                    }
+                    else {
+                        // Recursion for sub-lists:
+                        item = _DoLists(_Outdent(item));
+                        item = item.replace(/\n$/, ""); // chomp(item)
+                        item = _RunSpanGamut(item);
+                    }
+                    last_item_had_a_double_newline = ends_with_double_newline;
+                    return "<li>" + item + "</li>\n";
+                }
+            );
+
+            // attacklab: strip sentinel
+            list_str = list_str.replace(/~0/g, "");
+
+            g_list_level--;
+            return list_str;
+        }
+
+        function _DoCodeBlocks(text) {
+            //
+            //  Process Markdown `<pre><code>` blocks.
+            //  
+
+            /*
+            text = text.replace(/
+                (?:\n\n|^)
+                (                               // $1 = the code block -- one or more lines, starting with a space/tab
+                    (?:
+                        (?:[ ]{4}|\t)           // Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
+                        .*\n+
+                    )+
+                )
+                (\n*[ ]{0,3}[^ \t\n]|(?=~0))    // attacklab: g_tab_width
+            /g ,function(){...});
+            */
+
+            // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
+            text += "~0";
+
+            text = text.replace(/(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g,
+                function (wholeMatch, m1, m2) {
+                    var codeblock = m1;
+                    var nextChar = m2;
+
+                    codeblock = _EncodeCode(_Outdent(codeblock));
+                    codeblock = _Detab(codeblock);
+                    codeblock = codeblock.replace(/^\n+/g, ""); // trim leading newlines
+                    codeblock = codeblock.replace(/\n+$/g, ""); // trim trailing whitespace
+
+                    codeblock = "<pre><code>" + codeblock + "\n</code></pre>";
+
+                    return "\n\n" + codeblock + "\n\n" + nextChar;
+                }
+            );
+
+            // attacklab: strip sentinel
+            text = text.replace(/~0/, "");
+
+            return text;
+        }
+
+        function hashBlock(text) {
+            text = text.replace(/(^\n+|\n+$)/g, "");
+            return "\n\n~K" + (g_html_blocks.push(text) - 1) + "K\n\n";
+        }
+
+        function _DoCodeSpans(text) {
+            //
+            // * Backtick quotes are used for <code></code> spans.
+            // 
+            // * You can use multiple backticks as the delimiters if you want to
+            //   include literal backticks in the code span. So, this input:
+            //     
+            //      Just type ``foo `bar` baz`` at the prompt.
+            //     
+            //   Will translate to:
+            //     
+            //      <p>Just type <code>foo `bar` baz</code> at the prompt.</p>
+            //     
+            //   There's no arbitrary limit to the number of backticks you
+            //   can use as delimters. If you need three consecutive backticks
+            //   in your code, use four for delimiters, etc.
+            //
+            // * You can use spaces to get literal backticks at the edges:
+            //     
+            //      ... type `` `bar` `` ...
+            //     
+            //   Turns to:
+            //     
+            //      ... type <code>`bar`</code> ...
+            //
+
+            /*
+            text = text.replace(/
+                (^|[^\\])       // Character before opening ` can't be a backslash
+                (`+)            // $2 = Opening run of `
+                (               // $3 = The code block
+                    [^\r]*?
+                    [^`]        // attacklab: work around lack of lookbehind
+                )
+                \2              // Matching closer
+                (?!`)
+            /gm, function(){...});
+            */
+
+            text = text.replace(/(^|[^\\])(`+)([^\r]*?[^`])\2(?!`)/gm,
+                function (wholeMatch, m1, m2, m3, m4) {
+                    var c = m3;
+                    c = c.replace(/^([ \t]*)/g, ""); // leading whitespace
+                    c = c.replace(/[ \t]*$/g, ""); // trailing whitespace
+                    c = _EncodeCode(c);
+                    return m1 + "<code>" + c + "</code>";
+                }
+            );
+
+            return text;
+        }
+
+        function _EncodeCode(text) {
+            //
+            // Encode/escape certain characters inside Markdown code runs.
+            // The point is that in code, these characters are literals,
+            // and lose their special Markdown meanings.
+            //
+            // Encode all ampersands; HTML entities are not
+            // entities within a Markdown code span.
+            text = text.replace(/&/g, "&amp;");
+
+            // Do the angle bracket song and dance:
+            text = text.replace(/</g, "&lt;");
+            text = text.replace(/>/g, "&gt;");
+
+            // Now, escape characters that are magic in Markdown:
+            text = escapeCharacters(text, "\*_{}[]\\", false);
+
+            // jj the line above breaks this:
+            //---
+
+            //* Item
+
+            //   1. Subitem
+
+            //            special char: *
+            //---
+
+            return text;
+        }
+
+        function _DoItalicsAndBold(text) {
+
+            // <strong> must go first:
+            text = text.replace(/([\W_]|^)(\*\*|__)(?=\S)([^\r]*?\S[\*_]*)\2([\W_]|$)/g,
+            "$1<strong>$3</strong>$4");
+
+            text = text.replace(/([\W_]|^)(\*|_)(?=\S)([^\r\*_]*?\S)\2([\W_]|$)/g,
+            "$1<em>$3</em>$4");
+
+            return text;
+        }
+
+        function _DoBlockQuotes(text) {
+
+            /*
+            text = text.replace(/
+                (                           // Wrap whole match in $1
+                    (
+                        ^[ \t]*>[ \t]?      // '>' at the start of a line
+                        .+\n                // rest of the first line
+                        (.+\n)*             // subsequent consecutive lines
+                        \n*                 // blanks
+                    )+
+                )
+            /gm, function(){...});
+            */
+
+            text = text.replace(/((^[ \t]*>[ \t]?.+\n(.+\n)*\n*)+)/gm,
+                function (wholeMatch, m1) {
+                    var bq = m1;
+
+                    // attacklab: hack around Konqueror 3.5.4 bug:
+                    // "----------bug".replace(/^-/g,"") == "bug"
+
+                    bq = bq.replace(/^[ \t]*>[ \t]?/gm, "~0"); // trim one level of quoting
+
+                    // attacklab: clean up hack
+                    bq = bq.replace(/~0/g, "");
+
+                    bq = bq.replace(/^[ \t]+$/gm, "");     // trim whitespace-only lines
+                    bq = _RunBlockGamut(bq);             // recurse
+
+                    bq = bq.replace(/(^|\n)/g, "$1  ");
+                    // These leading spaces screw with <pre> content, so we need to fix that:
+                    bq = bq.replace(
+                            /(\s*<pre>[^\r]+?<\/pre>)/gm,
+                        function (wholeMatch, m1) {
+                            var pre = m1;
+                            // attacklab: hack around Konqueror 3.5.4 bug:
+                            pre = pre.replace(/^  /mg, "~0");
+                            pre = pre.replace(/~0/g, "");
+                            return pre;
+                        });
+
+                    return hashBlock("<blockquote>\n" + bq + "\n</blockquote>");
+                }
+            );
+            return text;
+        }
+
+        function _FormParagraphs(text, doNotUnhash) {
+            //
+            //  Params:
+            //    $text - string to process with html <p> tags
+            //
+
+            // Strip leading and trailing lines:
+            text = text.replace(/^\n+/g, "");
+            text = text.replace(/\n+$/g, "");
+
+            var grafs = text.split(/\n{2,}/g);
+            var grafsOut = [];
+
+            //
+            // Wrap <p> tags.
+            //
+            var end = grafs.length;
+            for (var i = 0; i < end; i++) {
+                var str = grafs[i];
+
+                // if this is an HTML marker, copy it
+                if (str.search(/~K(\d+)K/g) >= 0) {
+                    grafsOut.push(str);
+                }
+                else if (str.search(/\S/) >= 0) {
+                    str = _RunSpanGamut(str);
+                    str = str.replace(/^([ \t]*)/g, "<p>");
+                    str += "</p>"
+                    grafsOut.push(str);
+                }
+
+            }
+            //
+            // Unhashify HTML blocks
+            //
+            if (!doNotUnhash) {
+                end = grafsOut.length;
+                for (var i = 0; i < end; i++) {
+                    // if this is a marker for an html block...
+                    while (grafsOut[i].search(/~K(\d+)K/) >= 0) {
+                        var blockText = g_html_blocks[RegExp.$1];
+                        blockText = blockText.replace(/\$/g, "$$$$"); // Escape any dollar signs
+                        grafsOut[i] = grafsOut[i].replace(/~K\d+K/, blockText);
+                    }
+                }
+            }
+            return grafsOut.join("\n\n");
+        }
+
+        function _EncodeAmpsAndAngles(text) {
+            // Smart processing for ampersands and angle brackets that need to be encoded.
+
+            // Ampersand-encoding based entirely on Nat Irons's Amputator MT plugin:
+            //   http://bumppo.net/projects/amputator/
+            text = text.replace(/&(?!#?[xX]?(?:[0-9a-fA-F]+|\w+);)/g, "&amp;");
+
+            // Encode naked <'s
+            text = text.replace(/<(?![a-z\/?\$!])/gi, "&lt;");
+
+            return text;
+        }
+
+        function _EncodeBackslashEscapes(text) {
+            //
+            //   Parameter:  String.
+            //   Returns:    The string, with after processing the following backslash
+            //               escape sequences.
+            //
+
+            // attacklab: The polite way to do this is with the new
+            // escapeCharacters() function:
+            //
+            //     text = escapeCharacters(text,"\\",true);
+            //     text = escapeCharacters(text,"`*_{}[]()>#+-.!",true);
+            //
+            // ...but we're sidestepping its use of the (slow) RegExp constructor
+            // as an optimization for Firefox.  This function gets called a LOT.
+
+            text = text.replace(/\\(\\)/g, escapeCharacters_callback);
+            text = text.replace(/\\([`*_{}\[\]()>#+-.!])/g, escapeCharacters_callback);
+            return text;
+        }
+
+        function _DoAutoLinks(text) {
+
+            // note that at this point, all other URL in the text are already hyperlinked as <a href=""></a>
+            // *except* for the <http://www.foo.com> case
+
+            // automatically add < and > around unadorned raw hyperlinks
+            // must be preceded by space/BOF and followed by non-word/EOF character    
+            text = text.replace(/(^|\s)(https?|ftp)(:\/\/[-A-Z0-9+&@#\/%?=~_|\[\]\(\)!:,\.;]*[-A-Z0-9+&@#\/%=~_|\[\]])($|\W)/gi, "$1<$2$3>$4");
+
+            //  autolink anything like <http://example.com>
+            
+            var replacer = function (wholematch, m1) { return "<a href=\"" + m1 + "\">" + pluginHooks.plainLinkText(m1) + "</a>"; }
+            text = text.replace(/<((https?|ftp):[^'">\s]+)>/gi, replacer);
+
+            // Email addresses: <address@domain.foo>
+            /*
+            text = text.replace(/
+                <
+                (?:mailto:)?
+                (
+                    [-.\w]+
+                    \@
+                    [-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+
+                )
+                >
+            /gi, _DoAutoLinks_callback());
+            */
+
+            /* disabling email autolinking, since we don't do that on the server, either
+            text = text.replace(/<(?:mailto:)?([-.\w]+\@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi,
+                function(wholeMatch,m1) {
+                    return _EncodeEmailAddress( _UnescapeSpecialChars(m1) );
+                }
+            );
+            */
+            return text;
+        }
+
+        function _UnescapeSpecialChars(text) {
+            //
+            // Swap back in all the special characters we've hidden.
+            //
+            text = text.replace(/~E(\d+)E/g,
+                function (wholeMatch, m1) {
+                    var charCodeToReplace = parseInt(m1);
+                    return String.fromCharCode(charCodeToReplace);
+                }
+            );
+            return text;
+        }
+
+        function _Outdent(text) {
+            //
+            // Remove one level of line-leading tabs or spaces
+            //
+
+            // attacklab: hack around Konqueror 3.5.4 bug:
+            // "----------bug".replace(/^-/g,"") == "bug"
+
+            text = text.replace(/^(\t|[ ]{1,4})/gm, "~0"); // attacklab: g_tab_width
+
+            // attacklab: clean up hack
+            text = text.replace(/~0/g, "")
+
+            return text;
+        }
+
+        function _Detab(text) {
+            if (!/\t/.test(text))
+                return text;
+
+            var spaces = ["    ", "   ", "  ", " "],
+            skew = 0,
+            v;
+
+            return text.replace(/[\n\t]/g, function (match, offset) {
+                if (match === "\n") {
+                    skew = offset + 1;
+                    return match;
+                }
+                v = (offset - skew) % 4;
+                skew = offset + 1;
+                return spaces[v];
+            });
+        }
+
+        //
+        //  attacklab: Utility functions
+        //
+
+        var _problemUrlChars = /(?:["'*()[\]:]|~D)/g;
+
+        // hex-encodes some unusual "problem" chars in URLs to avoid URL detection problems 
+        function encodeProblemUrlChars(url) {
+            if (!url)
+                return "";
+
+            var len = url.length;
+
+            return url.replace(_problemUrlChars, function (match, offset) {
+                if (match == "~D") // escape for dollar
+                    return "%24";
+                if (match == ":") {
+                    if (offset == len - 1 || /[0-9\/]/.test(url.charAt(offset + 1)))
+                        return ":"
+                }
+                return "%" + match.charCodeAt(0).toString(16);
+            });
+        }
+
+
+        function escapeCharacters(text, charsToEscape, afterBackslash) {
+            // First we have to escape the escape characters so that
+            // we can build a character class out of them
+            var regexString = "([" + charsToEscape.replace(/([\[\]\\])/g, "\\$1") + "])";
+
+            if (afterBackslash) {
+                regexString = "\\\\" + regexString;
+            }
+
+            var regex = new RegExp(regexString, "g");
+            text = text.replace(regex, escapeCharacters_callback);
+
+            return text;
+        }
+
+
+        function escapeCharacters_callback(wholeMatch, m1) {
+            var charCodeToEscape = m1.charCodeAt(0);
+            return "~E" + charCodeToEscape + "E";
+        }
+
+    }; // end of the Markdown.Converter constructor
+
+})();
diff --git a/IPython/frontend/html/notebook/templates/notebook.html b/IPython/frontend/html/notebook/templates/notebook.html
index d2377fd..5b463da 100644
--- a/IPython/frontend/html/notebook/templates/notebook.html
+++ b/IPython/frontend/html/notebook/templates/notebook.html
@@ -99,8 +99,9 @@
                     <span id="cell_type" class="section_row_buttons">
                         <button id="to_code">Code</button>
                         <button id="to_html">HTML</button>
+                        <button id="to_rst">RST</button>
                     </span>
-                    <span class="button_label">Cell Type</span>
+                    <span class="button_label">Format</span>
                 </div>
                 <div class="section_row">
                     <span id="toggle_output" class="section_row_buttons">
@@ -177,6 +178,7 @@
 <script src="static/js/cell.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/codecell.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/htmlcell.js" type="text/javascript" charset="utf-8"></script>
+<script src="static/js/rstcell.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/kernel.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/kernelstatus.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/layout.js" type="text/javascript" charset="utf-8"></script>
@@ -186,13 +188,14 @@
 <script src="static/js/leftpanel.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/notebook.js" type="text/javascript" charset="utf-8"></script>
 <script src="static/js/notebook_main.js" type="text/javascript" charset="utf-8"></script>
-<script src="static/codemirror-2.12/lib/codemirror.js"></script>
-<script src="static/codemirror-2.12/mode/python/python.js"></script>
-<script src="static/codemirror-2.12/mode/htmlmixed/htmlmixed.js"></script>
-<script src="static/codemirror-2.12/mode/xml/xml.js"></script>
-<script src="static/codemirror-2.12/mode/javascript/javascript.js"></script>
-<script src="static/codemirror-2.12/mode/css/css.js"></script>
-<script src="static/codemirror-2.12/mode/rst/rst.js"></script>
+<script src="static/codemirror-2.12/lib/codemirror.js" charset="utf-8"></script>
+<script src="static/codemirror-2.12/mode/python/python.js" charset="utf-8"></script>
+<script src="static/codemirror-2.12/mode/htmlmixed/htmlmixed.js" charset="utf-8"></script>
+<script src="static/codemirror-2.12/mode/xml/xml.js" charset="utf-8"></script>
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