All files / hummus-toc/src countPages.js

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const {verticalMax, verticalMargin, lineSpacing} = require('../config')
 
module.exports = itemCount => {
  const verticalTextStart = verticalMax - verticalMargin
 
  let pageSize = 0
  let pages = 1
 
  for (let i = 0; i < itemCount; i++) {
    const pageIndex = pageSize ? i % pageSize : i
    const verticalOffset = lineSpacing * (pageIndex + 1)
    const verticalLineStart = verticalTextStart - verticalOffset
    if (verticalLineStart <= verticalMargin) {
      pages++
      if (!pageSize) {
        pageSize = i + 1
      }
    }
  }
 
  return pages
}