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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Current File : //lib/node_modules/npm/lib/search/all-package-search.js
var ms = require('mississippi')
var allPackageMetadata = require('./all-package-metadata')
var packageFilter = require('./package-filter.js')

module.exports = allPackageSearch
function allPackageSearch (opts) {
  var searchSection = (opts.unicode ? '🤔 ' : '') + 'search'

  // Get a stream with *all* the packages. This takes care of dealing
  // with the local cache as well, but that's an internal detail.
  var allEntriesStream = allPackageMetadata(opts)

  // Grab a stream that filters those packages according to given params.
  var filterStream = streamFilter(function (pkg) {
    opts.log.gauge.pulse('search')
    opts.log.gauge.show({section: searchSection, logline: 'scanning ' + pkg.name})
    // Simply 'true' if the package matches search parameters.
    var match = packageFilter(pkg, opts.include, opts.exclude, {
      description: opts.description
    })
    return match
  })
  return ms.pipeline.obj(allEntriesStream, filterStream)
}

function streamFilter (filter) {
  return ms.through.obj(function (data, enc, cb) {
    if (filter(data)) {
      this.push(standardizePkg(data))
    }
    cb()
  })
}

function standardizePkg (data) {
  return {
    name: data.name,
    description: data.description,
    maintainers: (data.maintainers || []).map(function (m) {
      return { username: m.name, email: m.email }
    }),
    keywords: data.keywords || [],
    version: Object.keys(data.versions || {})[0] || [],
    date: (
      data.time &&
      data.time.modified &&
      new Date(data.time.modified)
    ) || null
  }
}