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Bonk.io Left Gravity Mode

Add a left gravity mode to bonk.io. No idea if this is compatible with other extensions and I can't be bothered to test.

// ==UserScript==
// @name         Bonk.io Left Gravity Mode
// @version      1.2
// @author       Blu ft. Salama ft. MYTH_doglover
// @description  Add a left gravity mode to bonk.io. No idea if this is compatible with other extensions and I can't be bothered to test.
// @match        https://bonk.io/gameframe-release.html
// @run-at       document-start
// @grant        GM_xmlhttpRequest
// @license      MIT

// @namespace https://greasyfork.org/users/747730
// ==/UserScript==

// this userscript is a remix of Salama's Simple injector which is a remix of Blu's VarTOL injector which is a remix of Salama's VTOL injector!
// https://github.com/Salama/bonk-vtol/blob/master/injector.js

//Thanks to Salama for help with getting this to work!


const injectorName = `LeftGravity`;
const errorMsg = `Poops! ${injectorName} was comfortable to toad.
This may be poo to an resizement to Bonkio.com. If so, please don't report this error!
This could also be because you have an extension that is in cahoots with \
${injectorName}`;

function injector(src){
	let newSrc = src;
    //allow Left Gravity to be selected
	newSrc=newSrc.replace('[S9L.C1E(107),S9L.W1E(1130),S9L.C1E(1131),S9L.W1E(1132),',LEFTGRAVITY_MODE);
    newSrc=newSrc.replace('P1R[43][P1R[7][551]][S9L.C1E(116)]={lobbyName:S9L.C1E(2093),gameStartName:S9L.C1E(2094),lobbyDescription:S9L.W1E(2095),tutorialTitle:S9L.W1E(2096),tutorialText:S9L.W1E(2097),forceTeams:true,forceTeamCount:2,editorCanTarget:false};', LGMODE_METADATA);

    //add classic rules to Left Gravity
    newSrc=newSrc.replace('if(O7R[0][4][O7R[8][118]] == "b" || O7R[0][4][O7R[8][118]] == "v"', 'if(O7R[0][4][O7R[8][118]] == "b" || O7R[0][4][O7R[8][118]] == "v" || O7R[0][4][O7R[8][118]] == "lg"');
    newSrc=newSrc.replace('O7R[0][4][O7R[8][118]] == "b" || O7R[0][4][O7R[8][118]] == "bs"', 'O7R[0][4][O7R[8][118]] == "b" || O7R[0][4][O7R[8][118]] == "bs" || O7R[0][4][O7R[8][118]] == "lg"');

    //add gravity effect
    newSrc=newSrc.replace('"v"){;}',LEFTGRAVITY_GAME);

	if(src === newSrc) throw "Injection failed!";
	console.log(injectorName+" injector run");
	return newSrc;
}

// Adds LEFTGRAVITY to mode selection button
const LEFTGRAVITY_MODE= `[S9L.C1E(107),S9L.W1E(1130),S9L.C1E(1131),S9L.W1E(1132),"lg",`;
//add LEFTGRAVITY metadata
const LGMODE_METADATA= `P1R[43][P1R[7][551]][S9L.C1E(116)]={lobbyName:S9L.C1E(2093),gameStartName:S9L.C1E(2094),lobbyDescription:S9L.W1E(2095),tutorialTitle:S9L.W1E(2096),tutorialText:S9L.W1E(2097),forceTeams:true,forceTeamCount:2,editorCanTarget:false}; P1R[43][P1R[7][551]]["lg"] = {lobbyName:"Left Gravity",gameStartName:"LEFT GRAVITY",lobbyDescription:"Bonk with left gravity!",tutorialTitle:"Left Gravity Mode",tutorialText:"•Move with the arrow keys\\r\\n•Hold X to make yourself heavier",forceTeams:false,forceTeamCount:null,editorCanTarget:false};`;


const LEFTGRAVITY_GAME = `"v"){;} if (O7R[0][4][O7R[8][118]] == "lg"){

//change gravity function
if(O7R[72][O7R[8][177]]()[O7R[8][40]] != 0){O7R[72][O7R[8][178]](new P1R[2](-20,0));;}

                          }`;
const head = document.getElementsByTagName("head")[0];
head.appendChild = new Proxy(head.appendChild, {
    apply: async (target, thisArg, args) => {
        if (args[0] && args[0].src.includes("alpha2s.js")) {
            console.log("[NoGravity] Fetching alpha2s.js...")
            let src = await fetch(args[0].src).then(res => res.text())
            let newSrc=injector(src);

            //if(src === newSrc) throw "Injection failed!";
            // Remove the src attribute so it doesn't try to load the original script
            args[0].removeAttribute("src");
            // Add the new script to the <script>'s contents
            args[0].textContent = newSrc;

            console.log("[LEFT GRAVITY] Patched alpha2s.js")
        }
        return target.apply(thisArg, args);
    }
});
console.log(injectorName+" injector loaded");