Update man to add the manual guide

kernel/bin/find

@@ -0,0 +1,131 @@
+/** 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
+}
+
+async function walk(ctx, dir, nameRe, wantType, maxDepth, curDepth) {
+  if (maxDepth >= 0 && curDepth > maxDepth) return
+  let names
+  try {
+    names = await ctx.vfs.readdir(dir)
+  } catch {
+    return
+  }
+  for (const n of names) {
+    if (n === '.bareos_empty') continue
+    const path = dir.replace(/\/+$/, '') + '/' + n
+    let st
+    try {
+      st = await ctx.vfs.lstat(path)
+    } catch {
+      continue
+    }
+    if (!st) continue
+    if (!nameRe || nameRe.test(n)) {
+      if (!wantType || st.type === wantType) ctx.console.log(path)
+    }
+    if (st.type === 'directory') await walk(ctx, path, nameRe, wantType, maxDepth, curDepth + 1)
+  }
+}
+
+async function run(ctx, argv) {
+  let maxDepth = -1
+  /** @type {string | null} */
+  let nameGlob = null
+  /** @type {'file' | 'directory' | 'symlink' | null} */
+  let wantType = null
+  const rest = []
+  for (let i = 1; i < argv.length; i++) {
+    const a = argv[i]
+    if (a === '-maxdepth' && argv[i + 1]) {
+      maxDepth = Number.parseInt(argv[++i], 10)
+      continue
+    }
+    if (a === '-name' && argv[i + 1]) {
+      nameGlob = argv[++i]
+      continue
+    }
+    if (a === '-type' && argv[i + 1]) {
+      const t = argv[++i]
+      if (t === 'f') wantType = 'file'
+      else if (t === 'd') wantType = 'directory'
+      else if (t === 'l') wantType = 'symlink'
+      continue
+    }
+    if (a === '--') {
+      rest.push(...argv.slice(i + 1))
+      break
+    }
+    if (a.startsWith('-')) {
+      ctx.console.error('find: unsupported ' + a)
+      ctx.exitCode = 1
+      return
+    }
+    rest.push(a)
+  }
+  const root = rest[0] || '.'
+  let nameRe = null
+  if (nameGlob) {
+    const esc = nameGlob.replace(/[.+^${}()|[\]\\]/g, '\\$&').replace(/\*/g, '.*').replace(/\?/g, '.')
+    nameRe = new RegExp('^' + esc + '$')
+  }
+  const abs = ctx.vfs.resolveLogical(root)
+  await walk(ctx, abs, nameRe, wantType, maxDepth, 0)
+}