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Flag Randomizer Userscript

By Fillyanon
Created: 2022-01-18 19:30:27
Updated: 2022-01-19 09:19:28
Expiry: Never
sfwscript

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    // ==UserScript==
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    // @name Flag Randomizer
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    // @namespace http://ponepaste.org/5555
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    // @match https://boards.4channel.org/mlp/thread/*
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    // @match https://boards.4chan.org/mlp/thread/*
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    // @grant none
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    // @version 1.18
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    // @author Fillyanon, ScriptFilly
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    // @description Adds a flag randomizer to the Board.
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    // ==/UserScript==
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    'use strict'
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    let changeFlagOnKeyStroke = true;
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    const flags = Object.freeze({
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    MISC: ["4CC", "AN"],
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    G4: [
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    "AJ",
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    "ANF",
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    "APB",
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    "AU",
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    "BB",
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    "BM",
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    "BP",
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    "BS",
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    "CB",
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    "CG",
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    "CHE",
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    "CL",
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    "CO",
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    "DAY",
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    "DD",
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    "DER",
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    "DIS",
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    "DT",
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    "FAU",
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    "FL",
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    "FLE",
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    "GI",
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    "LI",
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    "LT",
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    "LY",
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    "MA",
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    "MAU",
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    "MIN",
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    "NI",
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    "NUR",
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    "OCT",
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    "PAR",
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    "PC",
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    "PCE",
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    "PI",
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    "PLU",
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    "PM",
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    "QC",
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    "RAR",
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    "RD",
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    "RLU",
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    "S1L",
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    "SCO",
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    "SHI",
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    "SIL",
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    "SP",
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    "SPI",
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    "STA",
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    "STL",
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    "SUN",
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    "SUS",
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    "SWB",
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    "TS",
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    "TWI",
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    "TX",
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    "VS",
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    "ZE",
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    ],
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    G5: ["HT", "IZ", "PP", "SPT", "ZS", "SS"],
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    EQG: [
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    "ADA",
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    "AB",
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    "SON",
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    "EQA",
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    "EQF",
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    "EQP",
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    "EQR",
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    "EQT",
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    "EQI",
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    "EQS",
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    "ERA",
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    ],
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    TFH: ["TFA", "TFO", "TFP", "TFS", "TFT", "TFV", "TP"],
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    });
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    // Collects all flags into a single, flat array.
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    const allFlags = Object.values(flags).flat();
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    // Returns a random element from an array.
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    const getRand = (coll) => {
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    return coll[Math.floor(Math.random() * coll.length)];
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    };
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    const makeOpt = (option) => {
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    const opt = document.createElement("option");
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    opt.value = opt.innerText = option;
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    selector.appendChild(opt);
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    }
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    const getPost = (use4chanX) => {
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    let post = (use4chanX !== "") ? use4chanX : document.forms.post;
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    return post;
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    }
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    let handler = false;
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    const changeFlag = () => {
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    let flagSelector = post.querySelector(".flagSelector");
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    if (selector.value == "OFF") return;
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    flagSelector.value = (selector.value != "ALL") ? getRand(flags[selector.value]) : getRand(allFlags);
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    }
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    const selector = document.createElement("select");
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    const botLine = document.querySelector('.navLinksBot');
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    selector.style = "margin-left: 1rem;";
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    selector.addEventListener("change", () => {
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    window.localStorage.setItem("flagGroup", selector.value);
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    });
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    Object.keys(flags).forEach((key) => {makeOpt(key);});
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    makeOpt("ALL");
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    makeOpt("OFF");
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    selector.value = window.localStorage.getItem("flagGroup") ?? "G4";
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    botLine.appendChild(selector);
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    function debounce(func, wait, immediate) {
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    var timeout;
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    return function() {
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    var context = this, args = arguments;
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    var later = function() {
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    timeout = null;
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    if (!immediate) func.apply(context, args);
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    };
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    var callNow = immediate && !timeout;
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    clearTimeout(timeout);
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    timeout = setTimeout(later, wait);
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    if (callNow) func.apply(context, args);
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    };
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    }
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    var myEfficientFn = debounce(function() { changeFlag(); }, 250, false);
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    let handled = true;
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    if (changeFlagOnKeyStroke == true) {
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    const config = {attributes: true, childList: true, subtree: true};
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    const callback = function (mutations, _) {
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    for (const mutation of mutations) {
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    if (mutation.type === 'childList') { // When new child is added
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    let use4chanX = document.getElementById("qr") ?? document.getElementById("quickReply") ?? "";
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    post = getPost(use4chanX);
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    // Do nothing if post is not loaded
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    if (post == null || post == undefined) {return;}
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    // Else update the flag
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    let reply = (use4chanX !== "") ? use4chanX.childNodes[1][5] : post[8];
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    reply.addEventListener('input', myEfficientFn);
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    }
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    }
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    };
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    const observer = new MutationObserver(callback);
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    observer.observe(document, config);
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    } else {
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    setInterval(() => {
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    let use4chanX = document.getElementById("qr") ?? "";
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    post = getPost(use4chanX);
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    if (post == null || post == undefined) { return; }
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    changeFlag();
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    }, 500);
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    }

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