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/lib/install/action/
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Current File : //lib/node_modules/npm/lib/install/action/move.js
'use strict'
var fs = require('graceful-fs')
var path = require('path')
var chain = require('slide').chain
var iferr = require('iferr')
var rimraf = require('rimraf')
var mkdirp = require('gentle-fs').mkdir
var rmStuff = require('../../unbuild.js').rmStuff
var lifecycle = require('../../utils/lifecycle.js')
var move = require('../../utils/move.js')

/*
  Move a module from one point in the node_modules tree to another.
  Do not disturb either the source or target location's node_modules
  folders.
*/

module.exports = function (staging, pkg, log, next) {
  log.silly('move', pkg.fromPath, pkg.path)
  chain([
    [lifecycle, pkg.package, 'preuninstall', pkg.fromPath, { failOk: true }],
    [lifecycle, pkg.package, 'uninstall', pkg.fromPath, { failOk: true }],
    [rmStuff, pkg.package, pkg.fromPath],
    [lifecycle, pkg.package, 'postuninstall', pkg.fromPath, { failOk: true }],
    [moveModuleOnly, pkg.fromPath, pkg.path, log],
    [lifecycle, pkg.package, 'preinstall', pkg.path, { failOk: true }],
    [removeEmptyParents, path.resolve(pkg.fromPath, '..')]
  ], next)
}

function removeEmptyParents (pkgdir, next) {
  fs.rmdir(pkgdir, function (er) {
    // FIXME: Make sure windows does what we want here
    if (er && er.code !== 'ENOENT') return next()
    removeEmptyParents(path.resolve(pkgdir, '..'), next)
  })
}

function moveModuleOnly (from, to, log, done) {
  var fromModules = path.join(from, 'node_modules')
  var tempFromModules = from + '.node_modules'
  var toModules = path.join(to, 'node_modules')
  var tempToModules = to + '.node_modules'

  log.silly('move', 'move existing destination node_modules away', toModules)

  move(toModules, tempToModules).then(removeDestination(done), removeDestination(done))

  function removeDestination (next) {
    return function (er) {
      log.silly('move', 'remove existing destination', to)
      if (er) {
        rimraf(to, iferr(next, makeDestination(next)))
      } else {
        rimraf(to, iferr(next, makeDestination(iferr(next, moveToModulesBack(next)))))
      }
    }
  }

  function moveToModulesBack (next) {
    return function () {
      log.silly('move', 'move existing destination node_modules back', toModules)
      move(tempToModules, toModules).then(next, done)
    }
  }

  function makeDestination (next) {
    return function () {
      log.silly('move', 'make sure destination parent exists', path.resolve(to, '..'))
      mkdirp(path.resolve(to, '..'), iferr(done, moveNodeModules(next)))
    }
  }

  function moveNodeModules (next) {
    return function () {
      log.silly('move', 'move source node_modules away', fromModules)
      move(fromModules, tempFromModules).then(doMove(moveNodeModulesBack(next)), doMove(next))
    }
  }

  function doMove (next) {
    return function () {
      log.silly('move', 'move module dir to final dest', from, to)
      move(from, to).then(next, done)
    }
  }

  function moveNodeModulesBack (next) {
    return function () {
      mkdirp(from, iferr(done, function () {
        log.silly('move', 'put source node_modules back', fromModules)
        move(tempFromModules, fromModules).then(next, done)
      }))
    }
  }
}