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
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Current File : //lib/node_modules/npm/lib/install/report-optional-failure.js
'use strict'
var path = require('path')
var moduleName = require('../utils/module-name.js')

module.exports = reportOptionalFailure

function top (tree) {
  if (tree.parent) return top(tree.parent)
  return tree
}

function reportOptionalFailure (tree, what, error) {
  var topTree = top(tree)
  if (!topTree.warnings) topTree.warnings = []
  var id
  if (what) {
    var depVer = tree.package.dependencies && tree.package.dependencies[what]
    var optDepVer = tree.package.optionalDependencies && tree.package.optionalDependencies[what]
    var devDepVer = tree.package.devDependencies && tree.package.devDependencies[what]
    var version = depVer || optDepVer || devDepVer
    id = what + (version ? '@' + version : '')
  } else {
    id = tree._id || moduleName(tree) + (tree.package.version ? '@' + tree.package.version : '')
  }
  var location = path.relative(topTree.path, tree.path)
  if (what) location = path.join(location, 'node_modules', what)

  error.optional = id
  error.location = location
  topTree.warnings.push(error)
}