CKEditor Retype Selection (Markdown trigger)

Delete selected text in CKEditor 5 and retype it char-by-char to trigger live markdown behavior.
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// ==UserScript==
// @name         CKEditor Retype Selection (Markdown trigger)
// @namespace    retype-ckeditor
// @version      1.0.0
// @description  Delete selected text in CKEditor 5 and retype it char-by-char to trigger live markdown behavior.
// @match        *://*/*
// @run-at       document-idle
// @allFrames    true
// @grant        GM_registerMenuCommand
// @license MIT
// ==/UserScript==

(() => {
  "use strict";

 const HOTKEY = {
  key: "Q",
  shiftKey: true,
  requireCtrlOrMeta: true
};

  const BASE_DELAY_MS = 12;
  const JITTER_MS = 8;

  const CK_EDITABLE_SEL = ".ck-editor__editable[contenteditable='true']";
  let running = false;

  const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
  const delay = () => BASE_DELAY_MS + Math.floor(Math.random() * (JITTER_MS + 1));

  function toast(msg) {
    try {
      const el = document.createElement("div");
      el.textContent = msg;
      el.style.cssText = `
        position:fixed; z-index:2147483647; left:16px; bottom:16px;
        padding:10px 12px; background:rgba(0,0,0,.85); color:#fff;
        font:13px/1.3 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
        border-radius:10px; box-shadow:0 6px 18px rgba(0,0,0,.25);
      `;
      document.documentElement.appendChild(el);
      setTimeout(() => el.remove(), 1400);
    } catch {}
  }

  function matchesHotkey(e) {
    const keyMatches = e.key.toUpperCase() === HOTKEY.key.toUpperCase();
    const modsMatch = (!!e.altKey === !!HOTKEY.altKey) && (!!e.shiftKey === !!HOTKEY.shiftKey);
    const ctrlOrMetaOk = HOTKEY.requireCtrlOrMeta ? (e.ctrlKey || e.metaKey) : true;
    return keyMatches && modsMatch && ctrlOrMetaOk;
  }

  function getSelectionRange() {
    const sel = window.getSelection();
    if (!sel || sel.rangeCount === 0) return null;
    const range = sel.getRangeAt(0);
    if (range.collapsed) return null;
    return range;
  }

  function getClosestCKEditableFromRange(range) {
    const n = range.commonAncestorContainer;
    const el = n.nodeType === Node.ELEMENT_NODE ? n : n.parentElement;
    if (!el) return null;
    return el.closest(CK_EDITABLE_SEL);
  }

  function dispatchBeforeInput(target, data, inputType) {
    const ev = new InputEvent("beforeinput", { bubbles: true, cancelable: true, data, inputType });
    return target.dispatchEvent(ev);
  }

  function dispatchInput(target, data, inputType) {
    target.dispatchEvent(new InputEvent("input", { bubbles: true, cancelable: false, data, inputType }));
  }

  function deleteSelection(editable, range) {
    editable.focus();


    if (!dispatchBeforeInput(editable, null, "deleteByCut")) return false;


    const ok = document.execCommand("delete");
    if (!ok) {
      try { range.deleteContents(); } catch { return false; }
    }

    dispatchInput(editable, null, "deleteByCut");
    return true;
  }

  function insertText(editable, text) {
    editable.focus();

    if (!dispatchBeforeInput(editable, text, "insertText")) return false;

    const ok = document.execCommand("insertText", false, text);
    if (!ok) {
      const sel = window.getSelection();
      if (!sel || sel.rangeCount === 0) return false;
      const r = sel.getRangeAt(0);
      r.deleteContents();
      r.insertNode(document.createTextNode(text));
      r.collapse(false);
      sel.removeAllRanges();
      sel.addRange(r);
    }

    dispatchInput(editable, text, "insertText");
    return true;
  }

  function insertParagraph(editable) {
    editable.focus();

    if (!dispatchBeforeInput(editable, null, "insertParagraph")) return false;

    const ok = document.execCommand("insertParagraph");
    if (!ok) document.execCommand("insertLineBreak");

    dispatchInput(editable, null, "insertParagraph");
    return true;
  }

  async function retype(editable, text) {
    for (let i = 0; i < text.length; i++) {
      const ch = text[i];
      if (ch === "\r") continue;
      if (ch === "\n") insertParagraph(editable);
      else insertText(editable, ch);
      await sleep(delay());
    }
  }

  async function run() {
    if (running) return;
    const range = getSelectionRange();
    if (!range) { toast("Retype: no selection"); return; }

    const editable = getClosestCKEditableFromRange(range);
    if (!editable) { toast("Retype: not in CKEditor"); return; }

    const selectedText = window.getSelection().toString();
    if (!selectedText) { toast("Retype: empty selection"); return; }

    running = true;
    toast("Retype: triggered");
    try {
      const ok = deleteSelection(editable, range);
      if (!ok) { toast("Retype: delete blocked"); return; }

      await sleep(30);
      await retype(editable, selectedText);

    } finally {
      running = false;
    }
  }

  document.addEventListener("keydown", (e) => {
    if (!matchesHotkey(e)) return;
    e.preventDefault();
    e.stopPropagation();
    run();
  }, true);

  if (typeof GM_registerMenuCommand === "function") {
    GM_registerMenuCommand("CKEditor: Retype selected text", run);
  }
})();