 (function () {
    scrapbox.PageMenu.addMenu({
      title: '見出し',
      image: 'https://gyazo.com/bc38721e0980f2188f1c831754ac8da4/raw',
      onClick: () => {
        scrapbox.PageMenu('見出し').removeAllItems()
        for (let line of scrapbox.Page.lines) {
          if (!line.section.start) continue
          const image = line.nodes && getIconUrl(line.nodes)
          const noIcon = !!image
          const title = line.nodes ? renderPlainText(line.nodes, {noIcon}) : line.text
          const onClick = () => location.hash = line.id
          scrapbox.PageMenu('見出し').addItem({title, image, onClick})
        }
      }
    })
      
    function renderPlainText (node, options) {
      if (node instanceof Array) return node.map(node => renderPlainText(node, options)).join('')
      if (typeof node === 'string') return node
      switch (node.type) {
        case 'icon':
        case 'strong-icon':
          return options.noIcon ? ' ' : node.unit.page
      }
      return renderPlainText(node.children, options)
    }
    
    function getIconUrl (node) {
      if (/icon/.test(node.type)) {
        return `/api/pages/${node.unit.project||scrapbox.Project.name}/${node.unit.page}/icon`
      }
      if (node instanceof Array) {
        return node.map(getIconUrl).find(img => img)
      }
      if (node.children) return getIconUrl(node.children)
      return null
    }
  })()