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script.js

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(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)