index.js

'use strict'
const glob = require('glob')
const prependFile = require('prepend-file')
const pkg = require(`${process.cwd()}/package.json`)

const getAuthorName = value => {
  if (typeof value === 'string') return value.split('<')[0].trim()
  if (value instanceof Object && typeof value.name === 'string')
    return value.name
  return ''
}

const unlicense = 'This is free and unencumbered software'

function banner (options = {}) {
  options.name = options.name || pkg.name || 'unknown'
  options.tag = options.tag || pkg.version || '0.0.0'
  options.homepage =
    options.homepage || pkg.homepage || `https://npm.com/${options.name}`
  options.license = options.license || pkg.license
  options.author = options.author || getAuthorName(pkg.author)
  options.year = options.year || new Date().getFullYear()

  const template =
    options.template ||
    `/*!
  * ${options.name.charAt(0).toUpperCase() + options.name.slice(1)} v${
      options.tag
    }
  * ${options.homepage}
  *
  * Copyright (c) ${options.year} ${options.author}
  * ${
    options.license
      ? `Licensed under the ${options.license} license\n *`
      : unlicense
  }/\n
`

  if (!options.source) {
    throw new Error(`File not found!`)
  } else {
    glob(options.source, (err, files) => {
      if (err) throw err
      files.map(file => prependFile.sync(file, template))
      process.exit(0)
    })
  }
}

module.exports = banner