bare-operating-system/packages/bare-os-seeder/kernel/bin/rm

/* BARE_OS_BIN_API 1.0.0 — bump when staged /bin script semantics change (see developer guide). */
/** Shared helpers for drive-resident /bin scripts (prepended before each command). */
function bareStdin(ctx) {
  return typeof ctx.shellStdin === 'string' ? ctx.shellStdin : ''
}

/** @param {number} mode @param {'file' | 'directory' | 'symlink'} type */
function bareFormatModeString(mode, type) {
  const typeChar = type === 'directory' ? 'd' : type === 'symlink' ? 'l' : '-'
  const perm = mode & 0o777
  const r = (bit) => (perm & bit ? 'r' : '-')
  const w = (bit) => (perm & bit ? 'w' : '-')
  const x = (bit) => (perm & bit ? 'x' : '-')
  return (
    typeChar +
    r(0o400) +
    w(0o200) +
    x(0o100) +
    r(0o040) +
    w(0o020) +
    x(0o010) +
    r(0o004) +
    w(0o002) +
    x(0o001)
  )
}

/** @param {number} mtimeMs @param {number} [nowMs] */
function bareFormatLsMtime(mtimeMs, nowMs) {
  const now = nowMs != null ? nowMs : Date.now()
  const d = new Date(mtimeMs)
  const months = [
    'Jan',
    'Feb',
    'Mar',
    'Apr',
    'May',
    'Jun',
    'Jul',
    'Aug',
    'Sep',
    'Oct',
    'Nov',
    'Dec'
  ]
  const mon = months[d.getMonth()]
  const day = String(d.getDate()).padStart(2, ' ')
  const sixMo = 180 * 24 * 3600 * 1000
  if (Math.abs(now - mtimeMs) > sixMo) {
    const yr = String(d.getFullYear()).padStart(4, ' ')
    return mon + ' ' + day + '  ' + yr
  }
  const hh = String(d.getHours()).padStart(2, '0')
  const mm = String(d.getMinutes()).padStart(2, '0')
  return mon + ' ' + day + ' ' + hh + ':' + mm
}

/** @param {number} size */
function barePosixBlocks(size) {
  return Math.ceil(Number(size) / 512) || 0
}

/**
 * Raw stdout for NUL/binary when **`process.stdout.write`** is missing.
 * If **`ctx.bareOsBinWrite(Uint8Array|string)`** is set (tests / host), use it.
 * @param {Record<string, unknown>} ctx
 * @param {string | Uint8Array} chunk
 * @returns {boolean}
 */
function bareOsEmitRaw(ctx, chunk) {
  if (typeof ctx.bareOsBinWrite === 'function') {
    const b4 = ctx.b4a
    const u8 =
      typeof chunk === 'string'
        ? b4 && typeof b4.from === 'function'
          ? b4.from(chunk)
          : new TextEncoder().encode(chunk)
        : chunk
    ctx.bareOsBinWrite(u8 instanceof Uint8Array ? u8 : new Uint8Array(u8))
    return true
  }
  const w = globalThis.process?.stdout?.write
  if (typeof w === 'function') {
    w.call(globalThis.process.stdout, chunk)
    return true
  }
  return false
}

/**
 * rm — remove files or directories.
 * Flags: -r -R --recursive, -f --force, -d --dir, -- ; bundled e.g. -rf
 */

/**
 * @param {Record<string, unknown>} vfs
 * @param {string} p logical path
 * @param {boolean} force
 */
async function rmTreeManual(vfs, p, force) {
  /** @type {{ type?: string } | null} */
  let st = null
  try {
    st = await vfs.lstat(p)
  } catch (e) {
    if (!force) throw e
    return
  }
  if (!st) {
    if (!force) throw new Error('No such file')
    return
  }
  if (st.type === 'directory') {
    /** @type {string[]} */
    const names = []
    try {
      for await (const n of vfs.readdir(p)) names.push(n)
    } catch (e) {
      if (!force) throw e
      return
    }
    for (const n of names) {
      const child =
        p.replace(/\/+$/, '') === ''
          ? '/' + n
          : p.replace(/\/$/, '') + '/' + n
      await rmTreeManual(vfs, child, force)
    }
    if (typeof vfs.rmdir === 'function') await vfs.rmdir(p)
    else await vfs.unlink(p)
    return
  }
  await vfs.unlink(p)
}

async function run(ctx, argv) {
  const vfs = ctx.vfs
  let recursive = false
  let force = false
  let dirEmptyOnly = false
  const files = []
  let dash = false
  for (let i = 1; i < argv.length; i++) {
    const a = argv[i]
    if (dash) {
      files.push(a)
      continue
    }
    if (a === '--') {
      dash = true
      continue
    }
    if (a === '--recursive' || a === '-r' || a === '-R') {
      recursive = true
      continue
    }
    if (a === '--force' || a === '-f') {
      force = true
      continue
    }
    if (a === '--dir' || a === '-d') {
      dirEmptyOnly = true
      continue
    }
    if (a.startsWith('-') && a.length > 1) {
      for (let j = 1; j < a.length; j++) {
        const c = a[j]
        if (c === 'r' || c === 'R') recursive = true
        else if (c === 'f') force = true
        else if (c === 'd') dirEmptyOnly = true
      }
      continue
    }
    files.push(a)
  }
  if (!files.length) {
    ctx.console.error('rm: missing operand')
    ctx.exitCode = 1
    return
  }
  if (dirEmptyOnly && recursive) {
    ctx.console.error('rm: cannot combine -d and -r')
    ctx.exitCode = 1
    return
  }
  const doRm =
    vfs && typeof vfs.rm === 'function'
      ? (p) => vfs.rm(p, { recursive, force })
      : async (p) => {
          if (recursive) return rmTreeManual(vfs, p, force)
          return vfs.unlink(p)
        }
  for (const f of files) {
    try {
      if (dirEmptyOnly) {
        const st = await vfs.lstat(f)
        if (!st) {
          if (!force) {
            ctx.console.error('rm: ' + f + ': No such file')
            ctx.exitCode = 1
          }
          continue
        }
        if (st.type !== 'directory') {
          ctx.console.error('rm: cannot remove ' + f + ': Not a directory')
          ctx.exitCode = 1
          continue
        }
        if (typeof vfs.rmdir === 'function') await vfs.rmdir(f)
        else {
          ctx.console.error('rm: rmdir not supported by this VFS')
          ctx.exitCode = 1
        }
        continue
      }
      await doRm(f)
    } catch (e) {
      if (force) continue
      ctx.console.error('rm: ' + f + ': ' + (e.message || e))
      ctx.exitCode = 1
    }
  }
}