Endless Summer on Tumblr Dashboard

Endless_Summer_on_dsbd.user.js

// ==UserScript==
// @name           Endless Summer on dsbd
// @namespace      http://www.tumblr.com/
// @description    random next link on tumblr dashboard
// @include        http://www.tumblr.com/dashboard/1*
// @include        http://www.tumblr.com/show/*/1*
// @include        https://www.tumblr.com/dashboard/1*
// @include        https://www.tumblr.com/show/*/1*
// @require        https://raw.github.com/gist/3242
// @require        https://raw.github.com/gist/198443
// @require        https://raw.github.com/gist/34615
// @version        0.0.4.0.9
// @update         2014-08-15
// ==/UserScript==

// requires AutoPagerize http://userscripts.org/scripts/show/8551 by swdyh
// requires fix of AutoPagerize http://d.hatena.ne.jp/t_f_m/20111121/1321886246a by t_f_m
// requires sharedObject http://exe.tyo.ro/2011/11/greasemonkey0912minibufferldrize.html
// using $X() https://gist.github.com/3242 by os0x
// using createDocumentFromString https://gist.github.com/198443 by os0x
// using wedata utility for GM https://gist.github.com/34615 by youpy

// endlesSummeRize fire on http://www.tumblr.com/dashboard/1000 or http://www.tumblr.com/show/photos/by/everyone/1000 or ...

(function(){
var dsbd = 'http://www.tumblr.com/dashboard';
var DATABASE_URL = 'http://wedata.net/items/54652.json';
var database = new Wedata.Database(DATABASE_URL);

var getId = function(info){
  var opt = {
    method: 'GET',
    url: dsbd,
    headers : {
    },
    onload: function(res) {
      var i = $X(info.nextLink, createDocumentFromString(res.responseText));
      if(i.length){
        i = i[0]; 
      }else{
        return;
      }
      var cacheInfo = {
        postNo  : i.href.match(/.*\/\d+\/(\d+)/)[1],
        nextLink  : info.nextLink
      };
      GM_setValue('cacheInfo', JSON.stringify(cacheInfo));  
    }
  };
  GM_xmlhttpRequest(opt);
};

var endlessSummer = function(doc, url, info){
  var cacheInfo = JSON.parse(GM_getValue('cacheInfo'));
  if (!cacheInfo){
    return;
  }
  var a = $X(cacheInfo.nextLink, doc);
  if (a.length) {
    a = a[0];
  }else{
    return;
  }
  a.href = location.pathname.replace(/(\/[^\/]+\/\d+)(\/\d+)/,'$1') + '?offset=' + draw(72997, cacheInfo.postNo);
  a.textContent = 'Searching for The Endless Summer \u2192 ';
  a.style.background='none repeat scroll 0 0 #4AADF0';
};

// Exponential Endless Summer 2013.08
var draw = function(oldestID, newestID) {
  var oldestUTime = getUnixTimeFromPostID(oldestID);
  var newestUTime = getUnixTimeFromPostID(newestID);
  var drawnUTime = oldestUTime + Math.floor((newestUTime - oldestUTime) * Math.random());
  return getPostIDFromUnixTime(drawnUTime);
}

var getPostIDFromUnixTime = function(utime) {
  if (utime < 1149465600000) {
    return;
  } else if (utime === Number.POSITIVE_INFINITY) {
    return Number.POSITIVE_INFINITY;
  }
  for (var i = 0; i < params.length; i++) {
    if (utime <= params[i].upperBound) {
      return Math.ceil(params[i].coefAlpha * Math.exp(params[i].coefBeta * (utime - 1136073600000)));
    }
  }
}

var getUnixTimeFromPostID = function(postID) {
  if (postID < 1) { return; }
  for (var i = 0; i < params.length; i++) {
    if (postID <= getPostIDFromUnixTime(params[i].upperBound)) {
      return Math.floor(Math.log(postID/params[i].coefAlpha)/params[i].coefBeta) + 1136073600000;
    }
  }
}

var params = [
  // f_i(t) = Alpha_i	* exp[Beta_i	* (t - t_0)]
  // t: Unix time [msec]
  // t_0 = 1136073600000 [msec] (2006-01-01T00:00:00+09:00)
  {coefAlpha: 1.211 * Math.pow(10,  -1), coefBeta: 1.571 * Math.pow(10, -10), upperBound: 1160012789359},
  {coefAlpha: 3.619 * Math.pow(10, -13), coefBeta: 1.266 * Math.pow(10,  -9), upperBound: 1163269541924},
  {coefAlpha: 2.120 * Math.pow(10,   0), coefBeta: 1.846 * Math.pow(10, -10), upperBound: 1172120791893},
  {coefAlpha: 1.179 * Math.pow(10, -49), coefBeta: 3.331 * Math.pow(10,  -9), upperBound: 1173392561265},
  {coefAlpha: 4.702 * Math.pow(10,  -7), coefBeta: 7.024 * Math.pow(10, -10), upperBound: 1176405323219},
  {coefAlpha: 5.338 * Math.pow(10,   1), coefBeta: 2.425 * Math.pow(10, -10), upperBound: 1182930300850},
  {coefAlpha: 8.255 * Math.pow(10,   3), coefBeta: 1.349 * Math.pow(10, -10), upperBound: 1193299359828},
  {coefAlpha: 2.496 * Math.pow(10,   6), coefBeta: 3.509 * Math.pow(10, -11), upperBound: 1241622616806},
  {coefAlpha: 2.907 * Math.pow(10,   5), coefBeta: 5.546 * Math.pow(10, -11), upperBound: 1283088065116},
  {coefAlpha: 5.206 * Math.pow(10,   4), coefBeta: 6.716 * Math.pow(10, -11), upperBound: 1291075200000},
  {coefAlpha: 8.329 * Math.pow(10,   4), coefBeta: 6.521 * Math.pow(10, -11), upperBound: 1292241600000},
  {coefAlpha: 8.396 * Math.pow(10,   4), coefBeta: 6.541 * Math.pow(10, -11), upperBound: 1307576237376},
  {coefAlpha: 7.746 * Math.pow(10,   4), coefBeta: 6.588 * Math.pow(10, -11), upperBound: 1313586050187},
  {coefAlpha: 8.798 * Math.pow(10,   6), coefBeta: 3.922 * Math.pow(10, -11), upperBound: 1340572542928},
  {coefAlpha: 2.693 * Math.pow(10,   8), coefBeta: 2.249 * Math.pow(10, -11), upperBound: Number.POSITIVE_INFINITY},
]

GM_registerMenuCommand('endless summer - clear cache', function() {
  GM_setValue('cacheInfo', '');
  database.clearCache();
});

database.get(function(items) {
  getId(items.data);
});
endlessSummer(document, '', '');

setTimeout(function(){
  if (sharedObject.AutoPagerize && sharedObject.AutoPagerize.addDocumentFilter){
    sharedObject.AutoPagerize.addDocumentFilter(endlessSummer);
  }
},0);
})();