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Seryiza / Hotkey Handler

// ==UserScript==
// @exclude *
//
// ==UserLibrary==
// @name Hotkey Handler
// @description Library to handle keyboard hotkeys.
// @copyright 2020, Sergey Zaborovsky (seryiza.xyz)
// @license MIT
// @version 1.0.2
// ==/UserLibrary==

// ==OpenUserJs==
// @author Seryiza
// ==/OpenUserJs==
// ==/UserScript==

const handlers = [];
const pressedCodes = new Set();

function handleHotkey(keyCodes, handler) {
    handlers.push({
        handler,
        keyCodes: new Set(keyCodes),
    });
}

function areSetsEquals(set1, set2) {
    if (set1.size !== set2.size) {
        return false;
    }

    for (let value of set1) {
        if (!set2.has(value)) {
            return false;
        }
    }
    return true;
}

document.addEventListener('keydown', (event) => {
    const keyCode = event.code;
    pressedCodes.add(keyCode);

    let wasAnyHandlerCalled = false;
    for (let { handler, keyCodes } of handlers) {
        if (areSetsEquals(keyCodes, pressedCodes)) {
            handler();
            wasAnyHandlerCalled = true;
        }
    }

    if (wasAnyHandlerCalled) {
        pressedCodes.clear();
    }
});

document.addEventListener('keyup', (event) => {
    const keyCode = event.code;
    pressedCodes.delete(keyCode);
});

window.handleHotkey = handleHotkey;