Convert a Confluence page's content to slides using Reveal.js

confluence-to-reveal.user.js

// ==UserScript==
// @name         Confluence Page to Reveal Slides
// @namespace    http://github.com/cormojs
// @version      1.0
// @description  Convert a Confluence page's content to slides using Reveal.js
// @author       cormojs
// @match        https://*/confluence/pages/viewpage.action*
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/reveal.js
// @grant        none
// @downloadURL  https://gist.github.com/cormojs/96f320187c6433ec33a15a0960f8d385/raw/confluence-to-reveal.user.js
// ==/UserScript==
/*global $*/
/*global jQuery*/
/*global Reveal*/

(function() {
  'use strict';

  $(document).ready(function() {
    // カスタム要素を定義してその中にreveal.jsを閉じ込める
    customElements.define('my-slides', class extends HTMLElement {
      connectedCallback() {
        // create Node object for reveal.js
        const wikiSlideContent = constructSlideConent(queryWikiContent());

        // attach shadow dom
        this.attachShadow({ mode: "open"}).appendChild(wikiSlideContent);

        // load slides
        const reveal = new Reveal(wikiSlideContent, { embedded: true });
        reveal.initialize();
      }
    });
    
    // ボタンを押したら定義したカスタム要素を作成する
    const mainContent = document.querySelector("#main-content");
    mainContent
      .parentNode
      .insertBefore(
        createStartButton(mainContent.parentNode, document.createElement("my-slides")),
        mainContent
      );
  });
  function createStartButton(parent, elemToInsert) {
    return $("<button>")
      .text("スライドをスタート")
      .on("click", () => {
        parent.insertBefore(
          elemToInsert,
          parent.querySelector("*")
        )
      })
      .get(0)
  }
  // h1～h4をスライド1枚の始まりと見て、1枚毎の Node の配列が入った配列を返す
  // また、先頭にはタイトルページを挿入する
  function partitionWikiContent(elems) {
    return elems.reduce((arr, elem) => {
      if ($(elem).is("h1") || $(elem).is("h2") || $(elem).is("h3") || $(elem).is("h4")) {
        return arr.concat([[elem]]);
      } else {
        arr[arr.length - 1] = arr[arr.length - 1].concat(elem);
        return arr;
      }
    }, [[createTitle("#title-text", ".author a")]])
    // いらないページを排除
    .filter(arr => arr.length != 0)
    .filter(elems => elems.length > 0 && !$(elems[0]).is("text"));
  }
  function queryWikiContent() {
    return document.querySelector("#main-content .wiki-content") 
      ?? document.querySelector("#main-content.wiki-content");
  }
  function constructSlideConent(elem) {
    return $("<div>")
      .addClass("reveal")
      .append(
        $("<div>")
          .addClass("slides")
          .append(
            ...partitionWikiContent($(elem).contents().toArray())
              .map(elems => $("<section>").append(...elems).get(0))
          )
      )
      .append(
        $("<link>").attr({ rel: "stylesheet", href: "https://cdn.jsdelivr.net/npm/[email protected]/dist/reveal.css"})
      )
      .append(
        $("<link>").attr({ rel: "stylesheet", href: "https://cdn.jsdelivr.net/npm/[email protected]/dist/theme/white.css" })
      )
      .append(
        $("<script>").attr({ type: "text/javascript", src: "https://cdn.jsdelivr.net/npm/[email protected]/dist/reveal.js" })
      )
      .css({ "height": "100vh", "width": "100%" })
      .get(0);
  }
  function createTitle(title, author) {
    const elem = document.createElement("div");
    elem.innerHTML = `
      <h1>${document.querySelector(title).textContent}</h1>
      <p>${document.querySelector(author).textContent}<p>
    `;
    return elem;
  }
})();