晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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sh-3ll 1.0
DIR:/lib/node_modules/npm/node_modules/pacote/
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Current File : //lib/node_modules/npm/node_modules/pacote/prefetch.js
'use strict'

const BB = require('bluebird')

const cacache = require('cacache')
const finished = BB.promisify(require('mississippi').finished)
const optCheck = require('./lib/util/opt-check')
const npa = require('npm-package-arg')

module.exports = prefetch
function prefetch (spec, opts) {
  opts = optCheck(opts)
  spec = npa(spec, opts.where)
  opts.log.warn('prefetch', 'pacote.prefetch() is deprecated. Please use pacote.tarball() instead.')
  const startTime = Date.now()
  if (!opts.cache) {
    opts.log.info('prefetch', 'skipping prefetch: no cache provided')
    return BB.resolve({ spec })
  }
  if (opts.integrity && !opts.preferOnline) {
    opts.log.silly('prefetch', 'checking if', opts.integrity, 'is already cached')
    return cacache.get.hasContent(opts.cache, opts.integrity).then(info => {
      if (info) {
        opts.log.silly('prefetch', `content already exists for ${spec} (${Date.now() - startTime}ms)`)
        return {
          spec,
          integrity: info.integrity,
          size: info.size,
          byDigest: true
        }
      } else {
        return prefetchByManifest(startTime, spec, opts)
      }
    })
  } else {
    opts.log.silly('prefetch', `no integrity hash provided for ${spec} - fetching by manifest`)
    return prefetchByManifest(startTime, spec, opts)
  }
}

let fetch
function prefetchByManifest (start, spec, opts) {
  let manifest
  let integrity
  return BB.resolve().then(() => {
    if (!fetch) {
      fetch = require('./lib/fetch')
    }
    const stream = fetch.tarball(spec, opts)
    if (!stream) { return }
    stream.on('data', function () {})
    stream.on('manifest', m => { manifest = m })
    stream.on('integrity', i => { integrity = i })
    return finished(stream)
  }).then(() => {
    opts.log.silly('prefetch', `${spec} done in ${Date.now() - start}ms`)
    return {
      manifest,
      spec,
      integrity: integrity || (manifest && manifest._integrity),
      byDigest: false
    }
  })
}