/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
function bareStdin(ctx) {
  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
}

async function run(ctx, argv) {
  const vfs = ctx.vfs
  const files = argv.slice(1).filter((a) => !a.startsWith('-'))
  let body = ''
  if (!files.length) {
    body = bareStdin(ctx)
    if (body === '') return
  } else {
    for (const f of files) {
      const buf = await vfs.readFile(f)
      if (!buf) {
        ctx.console.error('nl: ' + f + ': No such file')
        ctx.exitCode = 1
        continue
      }
      body += ctx.b4a.toString(buf)
    }
  }
  const lines = body.split('\n')
  if (lines.length && lines[lines.length - 1] === '') lines.pop()
  let n = 1
  for (const line of lines) {
    const num = String(n)
    const pad = ' '.repeat(Math.max(0, 6 - num.length)) + num
    ctx.console.log(pad + '\t' + line)
    n++
  }
}