/** 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
  let showAll = false
  let longFmt = false
  const paths = []
  for (let i = 1; i < argv.length; i++) {
    const a = argv[i]
    if (a === '--') {
      paths.push(...argv.slice(i + 1))
      break
    }
    if (a.startsWith('-') && a.length > 1) {
      for (let j = 1; j < a.length; j++) {
        const c = a[j]
        if (c === 'a') showAll = true
        else if (c === 'l') longFmt = true
        else if (c === '1') longFmt = false
      }
      continue
    }
    paths.push(a)
  }
  const targets = paths.length ? paths : ['.']

  for (const t of targets) {
    if (targets.length > 1) ctx.console.log(t + ':')
    let names
    try {
      names = await vfs.readdir(t)
    } catch (e) {
      ctx.console.error('ls: cannot access ' + t + ': ' + (e.message || e))
      continue
    }
    if (!showAll) names = names.filter((n) => n !== '.' && n !== '..')
    if (!longFmt) {
      ctx.console.log(names.join(' '))
    } else {
      for (const n of names) {
        const sub = t === '.' || t === './' ? n : t.replace(/\/$/, '') + '/' + n
        const st = await vfs.stat(sub)
        const tag = st ? (st.type === 'directory' ? 'd' : '-') : '?'
        const sz = st && st.size != null ? String(st.size) : '0'
        ctx.console.log(tag + 'rwxr-xr-x 1 user user ' + sz + ' ' + n)
      }
    }
  }
}