(function($) {
$(document).ready(function(){

 // putting lines by the pre blocks
 $("pre").each(function(){
 var pre = $(this).text().split("\n");
 var lines = new Array(pre.length+1);
 for(var i = 0; i < pre.length; i++) {
 var wrap = Math.floor(pre[i].split("").length / 70)
 if (pre[i]==""&&i==pre.length-1) {
 lines.splice(i, 1);
 } else {
 lines[i] = i+1;
 for(var j = 0; j < wrap; j++) {
 lines[i] += "\n";
 }
 }
 }
 $(this).before("<pre class='lines'>" + lines.join("\n") + "</pre>");
 });

 var headings = [];

 var collectHeaders = function(){
 headings.push({"top":$(this).offset().top - 15,"text":$(this).text()});
 }

 if($(".markdown-body h1").length > 1) $(".markdown-body h1").each(collectHeaders)
 else if($(".markdown-body h2").length > 1) $(".markdown-body h2").each(collectHeaders)
 else if($(".markdown-body h3").length > 1) $(".markdown-body h3").each(collectHeaders)

 $(window).scroll(function(){
 if(headings.length==0) return true;
 var scrolltop = $(window).scrollTop() || 0;
 if(headings[0] && scrolltop < headings[0].top) {
 $(".current-section").css({"opacity":0,"visibility":"hidden"});
 return false;
 }
 $(".current-section").css({"opacity":1,"visibility":"visible"});
 for(var i in headings) {
 if(scrolltop >= headings[i].top) {
 $(".current-section .name").text(headings[i].text);
 }
 }
 });

 $(".current-section a").click(function(){
 $(window).scrollTop(0);
 return false;
 })
});
})(jQuery)