// ==UserScript==
// @name         Xkcd Forums Time Delta
// @version      0.1
// @description  Finds the time since the previous post or a specified time
// @author       Faubi
// @grant        none
// @match        http://forums.xkcd.com/*
// @match        http://fora.xkcd.com/*
// @match        http://forums3.xkcd.com/*
// @match        http://echochamber.me/*
// @namespace    FaubiScripts
// ==/UserScript==
function get_date(element) {
return new Date(/» (.*) [A-Z]{3} /.exec(element.textContent)[1]);
}
function append_dif(element, time1, time2, label) {
var w = Math.floor((time1 - time2)/1000);
var days = Math.floor(w/86400);
var hours = Math.floor(w/3600)%24;
var minutes = Math.floor(w/60)%60;
var seconds = w%60;
var pList = element.parentNode.getElementsByClassName('delta');
if (pList.length > 0) {
element.parentNode.removeChild(pList[0]);
} else {
element.parentNode.appendChild(document.createElement('hr'));
}
var p = document.createElement('p');
p.innerHTML = 'Time since ' + label + ': ' + days + ' days, ' + hours + ' hours, ' + minutes + ' minutes, ' + seconds + ' seconds';
p.classList.add('delta');
element.parentNode.appendChild(p);
}
authors = document.getElementsByClassName('author');
for (var i=0;i<authors.length;i++) {
(function(){
var author = authors[i];
if (i>=1) {
var prevauthor = authors[i-1];
var button = document.createElement('input');
button.type = 'button';
button.style['line-height']='1.2em';
button.style['margin-left'] = '5px';
button.style['margin-right'] = '0px';
button.classList.add('button2');
button.value = 'ΔPrevious';
button.addEventListener('click', function(){
append_dif(author, get_date(author), get_date(prevauthor), 'previous post');
});
author.appendChild(button);
}
var button2 = document.createElement('input');
button2.type = 'button';
button2.style['line-height']='1.2em';
button2.style['margin-left'] = '5px';
button2.classList.add('button2');
button2.value = 'ΔInput';
button2.addEventListener('click', function(){
append_dif(author, get_date(author), new Date(prompt('Enter the date to compare to')), 'inputted time');
});
author.appendChild(button2);
})();
}