Extends the SRS interval by a random amount by filtering out items that are not within the interval.
// ==UserScript==
// @name Wanikani: Spread Review Intervals Display
// @namespace http://tampermonkey.net/
// @version 1.0.1
// @description Extends the SRS interval by a random amount by filtering out items that are not within the interval.
// @author Kumirei
// @include /^https://(www|preview).wanikani.com/(dashboard)?/
// @grant none
// @run-at document-idle
// @license MIT
// ==/UserScript==
;(async (wkof, $) => {
// Script info
const script_id = 'spread_review_intervals_display'
const script_name = 'Spread Review Intervals Display'
// Initiate WKOF
await confirm_wkof()
wkof.include('ItemData,Menu,Settings')
wkof.ready('Settings,Menu').then(load_settings).then(install_menu)
wkof.ready('ItemData').then(update_counts)
async function update_counts() {
const interval = wkof.settings[script_id].spread
const items = await wkof.ItemData.get_items('assignments')
const count = items.filter((item) => {
if (!item?.assignments?.available_at) return false
const overdue = calculate_overdue(item)
const spread = (seeded_prng(item.assignments.available_at + item.id) * interval) / 100
return overdue > spread
}).length
$('.navigation-shortcut--reviews span').text(String(count))
$('.lessons-and-reviews__reviews-button span').text(String(count))
$('#reviews-summary #review-queue-count').text(String(count))
setTimeout(update_counts, (60 - new Date().getMinutes()) * 1000 * 60 + 1000) // Update counts within a minute of top of the hour
}
// Makes sure that WKOF is installed
async function confirm_wkof() {
if (!wkof) {
let response = confirm(
`${script_name} requires WaniKani Open Framework.\nClick "OK" to be forwarded to installation instructions.`,
)
if (response) {
window.location.href =
'https://community.wanikani.com/t/instructions-installing-wanikani-open-framework/28549'
}
}
}
// Calculate how overdue an item is based on its available_at date and SRS stage
function calculate_overdue(item) {
const SRS_DURATIONS = [4, 8, 23, 47, 167, 335, 719, 2879, Infinity].map((time) => time * 3600000)
// Items without assignments or due dates, and burned items, are not overdue
if (!item.assignments || !item.assignments.available_at || item.assignments.srs_stage == 9) return -1
const dueMsAgo = Date.now() - Date.parse(item.assignments.available_at)
return dueMsAgo / SRS_DURATIONS[item.assignments.srs_stage - 1]
}
// Creates a new PRNG
function seeded_prng(seed) {
return mulberry32(xmur3(seed)())()
}
// Seed generator for PRNG
function xmur3(str) {
for (var i = 0, h = 1779033703 ^ str.length; i < str.length; i++)
(h = Math.imul(h ^ str.charCodeAt(i), 3432918353)), (h = (h << 13) | (h >>> 19))
return function () {
h = Math.imul(h ^ (h >>> 16), 2246822507)
h = Math.imul(h ^ (h >>> 13), 3266489909)
return (h ^= h >>> 16) >>> 0
}
}
// Seedable PRNG
function mulberry32(a) {
return function () {
var t = (a += 0x6d2b79f5)
t = Math.imul(t ^ (t >>> 15), t | 1)
t ^= t + Math.imul(t ^ (t >>> 7), t | 61)
return ((t ^ (t >>> 14)) >>> 0) / 4294967296
}
}
// Load WKOF settings
function load_settings() {
const defaults = {
spread: 10,
}
return wkof.Settings.load(script_id, defaults)
}
// Installs the options button in the menu
function install_menu() {
const config = {
name: script_id,
submenu: 'Settings',
title: script_name,
on_click: open_settings,
}
wkof.Menu.insert_script_link(config)
}
// Opens settings dialogue when button is pressed
function open_settings() {
const config = {
script_id,
title: script_name,
on_save: update_counts,
content: {
spread: {
type: 'number',
default: 10,
label: 'Spread Interval (%)',
hover_tip:
'The maximum percentage to spread the interval by. For example, if this is set to 10, then the interval will be extended by a random amount between 0% and 10%.',
},
},
}
new wkof.Settings(config).open()
}
})(window.wkof, window.jQuery)