From 9a89b69d98a659d55b0adcc20f93fe6b056d1285 Mon Sep 17 00:00:00 2001
From: dschick <schick.daniel@gmail.com>
Date: Fri, 21 Aug 2015 11:35:35 +0200
Subject: [PATCH] allow dublicate headlines in toc extension

Adds a random hash to the id and link of each heading in the toc
extension.
---
 nbextensions/toc.js | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/nbextensions/toc.js b/nbextensions/toc.js
index 35eb7e3..ddf2d96 100644
--- a/nbextensions/toc.js
+++ b/nbextensions/toc.js
@@ -17,13 +17,26 @@ toc.load_ipython_extension();
 define(["require", "jquery", "base/js/namespace"], function (require, $, IPython) {
   "use strict";
 
+  var rand = function() {
+	   return Math.random().toString(36).substr(2); // remove `0.`
+  };
+
   var make_link = function (h) {
+
     var a = $("<a/>");
-    a.attr("href", '#' + h.attr('id'));
+
+
     // get the text *excluding* the link text, whatever it may be
     var hclone = h.clone();
     hclone.children().remove();
     a.text(hclone.text());
+
+    var newID = hclone.text().toLowerCase().replace(/[^\w ]+/g,'').replace(/ +/g,'-') + '_' + rand();
+
+
+    h.attr('id', newID);
+    a.attr("href", '#' + newID);
+
     return a;
   };