css/docs/lib/ignore.js

const {green, red, yellow} = require('colorette')
const {readFileSync, writeFileSync} = require('fs-extra')

const HEADER = '# DO NOT EDIT: automatically generated by ignore.js'

module.exports = {getIgnored, setIgnored}

function readLines(file) {
  let content
  try {
    content = readFileSync(file, 'utf8')
  } catch (error) {
    console.warn(`ignore file ${file} does not exist!`)
    return []
  }

  return content.trim().split('\n').map(line => line.trim())
}

function getIgnored(file) {
  const lines = readLines(file)
  const headerIndex = lines.indexOf(HEADER)
  if (headerIndex === -1) {
    console.warn(`ignore file ${file} does not contain the automatically generated header`)
    return []
  }

  return lines.slice(headerIndex + 1).filter(line => line)
}

function setIgnored(file, files) {
  const lines = readLines(file)
  const headerIndex = lines.indexOf(HEADER)
  if (headerIndex === -1) {
    lines.push(HEADER)
  } else {
    lines.splice(headerIndex + 1)
  }
  lines.push(...files)
  writeFileSync(file, lines.join('\n'), 'utf8')
}