GoogleSlideのスピーカーノートに書いた台本を元にタイムコードを埋め込むGAS

main.gs

function onOpen() {
  SlidesApp.getUi()
  .createMenu("UpdateTalkTimes")
  .addItem("Update TalkTime in Notes", `updateTalkTimesAction`) //タイムコードを埋め込む。繰り返し実行可
  .addItem("Remove TalkTime in Notes", `removeTalkTimesAction`) //タイムコードを取り除く
  .addToUi()
}

function removeTalkTimesAction() {
  //一部だけリセットしたければその区間を引数に渡す。省略時は全てが対象になる
  removeTalkTimesAndCalculateTotalTextLength();
}

function updateTalkTimesAction() {
  let ui = SlidesApp.getUi();
  let promptResponse = ui.prompt("発表時間の注釈の更新", "発表時間を分で入力して下さい", ui.ButtonSet.OK_CANCEL);

  let talkMinutes = Number.parseInt(promptResponse.getResponseText());
  updateTalkTimes(talkMinutes * 60)
}

function getActivePresentation(slideStart, slideEnd)
{
  var slides = SlidesApp.getActivePresentation().getSlides()
  if (slideStart != undefined)
  {
    return slides.slice(slideStart, slideEnd)
  }
  else {
    return slides;
  }
}

function removeTalkTimesAndCalculateTotalTextLength(slideStart, slideEnd) {
  var totalTextLength = 0;
  getActivePresentation(slideStart, slideEnd).forEach(slide => {
    let spekerNoteShape = slide.getNotesPage().getSpeakerNotesShape()
    let text = spekerNoteShape.getText()
    text.setText(stripText(text.asString()))
    totalTextLength += text.asString().length
  })
  return totalTextLength;
}

function stripText(text) {
  return text.replace(/\[#\d*:\d*:\d*\-#\d*:\d*:\d*\]\n/gm, "")
}

function updateTalkTimes(talkTimeInSeconds, slideStart, slideEnd) {
  var totalTextLength = removeTalkTimesAndCalculateTotalTextLength(slideStart, slideEnd);
  var elapsedTextLength = 0;
  getActivePresentation(slideStart, slideEnd).forEach(slide => {
    let spekerNoteShape = slide.getNotesPage().getSpeakerNotesShape()
    let text = spekerNoteShape.getText()
    let startTime = new Date(1000 * talkTimeInSeconds * (elapsedTextLength / totalTextLength));
    elapsedTextLength += text.asString().length
    let endTime = new Date(1000 * talkTimeInSeconds * (elapsedTextLength / totalTextLength));
    text.insertText(
      0,
      `[#${startTime.getUTCHours().toString().padStart(2,'0')}:${startTime.getUTCMinutes().toString().padStart(2,'0')}:${startTime.getUTCSeconds().toString().padStart(2,'0')}`+ 
      `-#${endTime.getUTCHours().toString().padStart(2,'0')}:${endTime.getUTCMinutes().toString().padStart(2,'0')}:${endTime.getUTCSeconds().toString().padStart(2,'0')}]\n`)
  })
}