bin.js

#!/usr/bin/env node

import fs from 'node:fs'
import minimist from 'minimist'
import concat from 'simple-concat'
import insert from './index.js'

const args = minimist(process.argv.slice(2))

const file = args._[0]
if (!file || args.h || args.help) {
  console.log(fs.readFileSync(new URL('./usage.txt', import.meta.url), 'utf8'))
  process.exit(args.h || args.help ? 0 : 1)
}

const inPlace = args.i || false
const source = fs.createReadStream(file)
concat(process.stdin, function (err, content) {
  if (err) throw err

  const stream = insert({
    content: content.toString('utf8'),
    header: args.header,
    region: args.region
  })

  source.pipe(stream)
  if (inPlace) {
    concat(stream, function (err, result) {
      if (err) throw err
      fs.writeFile(file, result, function (err) {
        if (err) throw err
      })
    })
  } else {
    stream.pipe(process.stdout)
  }
})