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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'use strict'

const BB = require('bluebird')

const exec = require('child_process').execFile
const spawn = require('./spawn')
const npm = require('../npm.js')
const which = require('which')
const git = npm.config.get('git')
const assert = require('assert')
const log = require('npmlog')
const noProgressTillDone = require('./no-progress-while-running.js').tillDone

exports.spawn = spawnGit
exports.exec = BB.promisify(execGit)
exports.chainableExec = chainableExec
exports.whichAndExec = whichAndExec

function prefixGitArgs () {
  return process.platform === 'win32' ? ['-c', 'core.longpaths=true'] : []
}

function execGit (args, options, cb) {
  log.info('git', args)
  const fullArgs = prefixGitArgs().concat(args || [])
  return exec(git, fullArgs, options, noProgressTillDone(cb))
}

function spawnGit (args, options) {
  log.info('git', args)
  // If we're already in a git command (eg, running test as an exec
  // line in an interactive rebase) then these environment variables
  // will force git to operate on the current project, instead of
  // checking out/fetching/etc. whatever the user actually intends.
  options.env = options.env || Object.keys(process.env)
    .filter(k => !/^GIT/.test(k))
    .reduce((set, k) => {
      set[k] = process.env[k]
      return set
    }, {})
  return spawn(git, prefixGitArgs().concat(args || []), options)
}

function chainableExec () {
  var args = Array.prototype.slice.call(arguments)
  return [execGit].concat(args)
}

function whichAndExec (args, options, cb) {
  assert.equal(typeof cb, 'function', 'no callback provided')
  // check for git
  which(git, function (err) {
    if (err) {
      err.code = 'ENOGIT'
      return cb(err)
    }

    execGit(args, options, cb)
  })
}