GoogleSlideでスライド内リンクの末尾にページ数を付与する（更新の場合は最新情報にする）

updateTocLinkPageNumber.js

function onInstall(e) {
  onOpen();
}

function onOpen(e) {
  SlidesApp.getUi().createAddonMenu()
      .addItem('Update TOC Link Page Number', 'updateTocLinkPageNumber')
      .addToUi();
}

function getTargetPageNumber(title) {
  const ui = SlidesApp.getUi()
  const res = ui.prompt(title,"Please Input Target Page Number?", ui.ButtonSet.OK_CANCEL)
  if (res.getSelectedButton() === ui.Button.OK){
    return parseInt(res.getResponseText())
  }
  else {
    Logger.log('Failed.')
  }
}

function updateTocLinkPageNumber() {
  const presentation = SlidesApp.getActivePresentation()
  const slides = presentation.getSlides()

  const tocSlide = slides[getTargetPageNumber('Update TOC Link Page Number') - 1]
  const shapes = tocSlide.getShapes().filter(s => s.getShapeType() === SlidesApp.ShapeType.TEXT_BOX)

  shapes.forEach(shape => {
    const textRange = shape.getText()
    const paragraphs = textRange.getParagraphs().filter(p => {
      const links = p.getRange().getLinks()
      
      if (links.length === 0) {
        return false
      }

      return links[0].getTextStyle().getLink().getLinkType() === SlidesApp.LinkType.SLIDE_ID
    })
    
    paragraphs.forEach(paragraph => {
      const textRange = paragraph.getRange()
      const link = textRange.getLinks()[0].getTextStyle().getLink()
      const slideId = link.getSlideId()
      const pageIndex = slides.findIndex(s => s.getObjectId() === slideId) + 1
      const slide = slides.find(s => s.getObjectId() === slideId)
          
      const text = textRange.asString()
      const pageNumPattern = / \(p\d+\)/
      const match = text.match(pageNumPattern)
      
      if (match){
        textRange.replaceAllText(match[0], '')
      }

      const pageNumText = ` (p${pageIndex})`
      const textLength = paragraph.getRange().asString().length
      // -1しないと改行文字列が含まれてしまうため改行後に注釈が含まれてしまう
      textRange.insertText(textLength - 1, pageNumText)
      textRange.getTextStyle().setLinkSlide(slide)
    })
  })
}