豆瓣读书“山倒－抽丝－即焚”与预计读完日期显示

douban_book_estimator.user.js

// ==UserScript==
// @name           douban book estimator
// @description    douban book reading
// @namespace      http://tianhua.me/
// @auth           break
// @version        0.122
// @license        Public Domain
// @include		   http://www.douban.com/*
// @include		   http://book.douban.com/*
// ==/UserScript==

function main(){

	function replace_strings(detailed) {
		detailed = detailed.replace(/想读/ig, '山倒');
		detailed = detailed.replace(/在读/ig, '抽丝');
		detailed = detailed.replace(/读过/ig, '即焚');
		return detailed;
	}
	
	function setPrompt(msg) {
		var date = new Date();  
        date.setTime(date.getTime() + (1 * 60 * 60 * 1000));
        $.cookie('db_book_msg', msg, { path: '/', expires: date });
		$('.aside').before(msg);
	}
	
	jQuery.cookie = function(name, value, options) {  
     if (typeof value != 'undefined') { // name and value given, set cookie
          options = options || {};  
         if (value === null) {  
              value = '';  
              options.expires = -1;  
          }  
         var expires = '';  
         if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {  
             var date;  
             if (typeof options.expires == 'number') {  
                  date = new Date();  
                  date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));  
              } else {  
                  date = options.expires;  
              }  
              expires = '; expires=' + date.toUTCString();  
          }  
         var path = options.path ? '; path=' + (options.path) : '';  
         var domain = options.domain ? '; domain=' + (options.domain) : '';  
         var secure = options.secure ? '; secure' : '';  
          document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');  
      } else {  
         var cookieValue = null;  
         if (document.cookie && document.cookie != '') {  
             var cookies = document.cookie.split(';');  
             for (var i = 0; i < cookies.length; i++) {  
                 var cookie = jQuery.trim(cookies[i]);  
                 if (cookie.substring(0, name.length + 1) == (name + '=')) {  
                      cookieValue = decodeURIComponent(cookie.substring(name.length + 1));  
                     break;  
                  }  
              }  
          }  
         return cookieValue;  
      }  
	};
	
	var btns = $('#interest_sect_level a[rel="nofollow"]');
	if (btns.length > 0) {
		$(btns[0]).find('span').html('山倒');
		$(btns[1]).find('span').html('抽丝');
		$(btns[2]).find('span').html('即焚');
	}
	var detailed = '' + $('#book span').html();
	if (detailed != 'undefined') {
		$('#book span').html(replace_strings(detailed));
	}
	var nav_list = $('#db-usr-profile');
	if (nav_list.length > 0) {
		p = nav_list.html();
		p = replace_strings(p);
		nav_list.html(p);
	}
	
	var msg = '' + $.cookie('db_book_msg');
	if (msg != 'undefined' && msg != '' && msg != 'null') {
		$('.aside').before(msg);
		return;
	}
	$.get('http://book.douban.com/mine?status=collect&mode=list', function(doc) {
		var books = $(doc).find('.date');
		var n = books.length;
		var lastDate = books[n-1].innerHTML.trim();
		var firstDate = books[0].innerHTML.trim();
		var diff = Date.parse(firstDate) - Date.parse(lastDate);
		if (n > 2) {
			diff = diff/3600/1000/24/(n-2);
			$.get('http://book.douban.com/mine?status=wish&mode=list', function(doc2) {
				var totalCount = parseInt($(doc2).find('h1').html().match(/\d+/)[0]);
				$.get('http://book.douban.com/mine?status=do&mode=list', function(doc3) {
					totalCount += parseInt($(doc3).find('h1').html().match(/\d+/)[0]);
					if (totalCount > 0) {
						var estDays = Math.round(totalCount / diff);
						setPrompt('<h2>您目前在读和想读的书预计在' + estDays + '天后看完</h2>');
					} else {
						setPrompt('<h2>小心：三天不看书，智商输给猪！</h2>');
					}
				});
			});
		} else {
			setPrompt('<h2>您目前在读和想读的书大概怎么也看不完了</h2>');
		}
	});
};

function addJQuery(callback) {
  var script = document.createElement("script");
  script.setAttribute("src", "//code.jquery.com/jquery-latest.min.js");
  script.addEventListener('load', function() {
    var script = document.createElement("script");
    script.textContent = "(" + callback.toString() + ")();";
    document.body.appendChild(script);
  }, false);
  document.body.appendChild(script);
}

// load jQuery and execute the main function
addJQuery(main);