From 3c51c3be85bb0d1bdb87ea0d6632f1c256912f27 Mon Sep 17 00:00:00 2001
From: Dimitri Staessens <dimitri@ouroboros.rocks>
Date: Sun, 6 Oct 2019 21:37:45 +0200
Subject: build: Add some required modules for node

---
 node_modules/yargs/yargs.js | 1185 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1185 insertions(+)
 create mode 100644 node_modules/yargs/yargs.js

(limited to 'node_modules/yargs/yargs.js')

diff --git a/node_modules/yargs/yargs.js b/node_modules/yargs/yargs.js
new file mode 100644
index 0000000..d9d34a4
--- /dev/null
+++ b/node_modules/yargs/yargs.js
@@ -0,0 +1,1185 @@
+'use strict'
+const argsert = require('./lib/argsert')
+const fs = require('fs')
+const Command = require('./lib/command')
+const Completion = require('./lib/completion')
+const Parser = require('yargs-parser')
+const path = require('path')
+const Usage = require('./lib/usage')
+const Validation = require('./lib/validation')
+const Y18n = require('y18n')
+const objFilter = require('./lib/obj-filter')
+const setBlocking = require('set-blocking')
+const applyExtends = require('./lib/apply-extends')
+const YError = require('./lib/yerror')
+
+exports = module.exports = Yargs
+function Yargs (processArgs, cwd, parentRequire) {
+  processArgs = processArgs || [] // handle calling yargs().
+
+  const self = {}
+  let command = null
+  let completion = null
+  let groups = {}
+  let output = ''
+  let preservedGroups = {}
+  let usage = null
+  let validation = null
+
+  const y18n = Y18n({
+    directory: path.resolve(__dirname, './locales'),
+    updateFiles: false
+  })
+
+  if (!cwd) cwd = process.cwd()
+
+  self.$0 = process.argv
+    .slice(0, 2)
+    .map((x, i) => {
+      // ignore the node bin, specify this in your
+      // bin file with #!/usr/bin/env node
+      if (i === 0 && /\b(node|iojs)(\.exe)?$/.test(x)) return
+      const b = rebase(cwd, x)
+      return x.match(/^(\/|([a-zA-Z]:)?\\)/) && b.length < x.length ? b : x
+    })
+    .join(' ').trim()
+
+  if (process.env._ !== undefined && process.argv[1] === process.env._) {
+    self.$0 = process.env._.replace(
+      `${path.dirname(process.execPath)}/`, ''
+    )
+  }
+
+  // use context object to keep track of resets, subcommand execution, etc
+  // submodules should modify and check the state of context as necessary
+  const context = { resets: -1, commands: [], fullCommands: [], files: [] }
+  self.getContext = () => context
+
+  // puts yargs back into an initial state. any keys
+  // that have been set to "global" will not be reset
+  // by this action.
+  let options
+  self.resetOptions = self.reset = function resetOptions (aliases) {
+    context.resets++
+    aliases = aliases || {}
+    options = options || {}
+    // put yargs back into an initial state, this
+    // logic is used to build a nested command
+    // hierarchy.
+    const tmpOptions = {}
+    tmpOptions.local = options.local ? options.local : []
+    tmpOptions.configObjects = options.configObjects ? options.configObjects : []
+
+    // if a key has been explicitly set as local,
+    // we should reset it before passing options to command.
+    const localLookup = {}
+    tmpOptions.local.forEach((l) => {
+      localLookup[l] = true
+      ;(aliases[l] || []).forEach((a) => {
+        localLookup[a] = true
+      })
+    })
+
+    // preserve all groups not set to local.
+    preservedGroups = Object.keys(groups).reduce((acc, groupName) => {
+      const keys = groups[groupName].filter(key => !(key in localLookup))
+      if (keys.length > 0) {
+        acc[groupName] = keys
+      }
+      return acc
+    }, {})
+    // groups can now be reset
+    groups = {}
+
+    const arrayOptions = [
+      'array', 'boolean', 'string', 'skipValidation',
+      'count', 'normalize', 'number',
+      'hiddenOptions'
+    ]
+
+    const objectOptions = [
+      'narg', 'key', 'alias', 'default', 'defaultDescription',
+      'config', 'choices', 'demandedOptions', 'demandedCommands', 'coerce'
+    ]
+
+    arrayOptions.forEach((k) => {
+      tmpOptions[k] = (options[k] || []).filter(k => !localLookup[k])
+    })
+
+    objectOptions.forEach((k) => {
+      tmpOptions[k] = objFilter(options[k], (k, v) => !localLookup[k])
+    })
+
+    tmpOptions.envPrefix = options.envPrefix
+    options = tmpOptions
+
+    // if this is the first time being executed, create
+    // instances of all our helpers -- otherwise just reset.
+    usage = usage ? usage.reset(localLookup) : Usage(self, y18n)
+    validation = validation ? validation.reset(localLookup) : Validation(self, usage, y18n)
+    command = command ? command.reset() : Command(self, usage, validation)
+    if (!completion) completion = Completion(self, usage, command)
+
+    completionCommand = null
+    output = ''
+    exitError = null
+    hasOutput = false
+    self.parsed = false
+
+    return self
+  }
+  self.resetOptions()
+
+  // temporary hack: allow "freezing" of reset-able state for parse(msg, cb)
+  let frozen
+  function freeze () {
+    frozen = {}
+    frozen.options = options
+    frozen.configObjects = options.configObjects.slice(0)
+    frozen.exitProcess = exitProcess
+    frozen.groups = groups
+    usage.freeze()
+    validation.freeze()
+    command.freeze()
+    frozen.strict = strict
+    frozen.completionCommand = completionCommand
+    frozen.output = output
+    frozen.exitError = exitError
+    frozen.hasOutput = hasOutput
+    frozen.parsed = self.parsed
+  }
+  function unfreeze () {
+    options = frozen.options
+    options.configObjects = frozen.configObjects
+    exitProcess = frozen.exitProcess
+    groups = frozen.groups
+    output = frozen.output
+    exitError = frozen.exitError
+    hasOutput = frozen.hasOutput
+    self.parsed = frozen.parsed
+    usage.unfreeze()
+    validation.unfreeze()
+    command.unfreeze()
+    strict = frozen.strict
+    completionCommand = frozen.completionCommand
+    parseFn = null
+    parseContext = null
+    frozen = undefined
+  }
+
+  self.boolean = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('boolean', keys)
+    return self
+  }
+
+  self.array = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('array', keys)
+    return self
+  }
+
+  self.number = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('number', keys)
+    return self
+  }
+
+  self.normalize = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('normalize', keys)
+    return self
+  }
+
+  self.count = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('count', keys)
+    return self
+  }
+
+  self.string = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('string', keys)
+    return self
+  }
+
+  self.requiresArg = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintObject(self.nargs, false, 'narg', keys, 1)
+    return self
+  }
+
+  self.skipValidation = function (keys) {
+    argsert('<array|string>', [keys], arguments.length)
+    populateParserHintArray('skipValidation', keys)
+    return self
+  }
+
+  function populateParserHintArray (type, keys, value) {
+    keys = [].concat(keys)
+    keys.forEach((key) => {
+      options[type].push(key)
+    })
+  }
+
+  self.nargs = function (key, value) {
+    argsert('<string|object|array> [number]', [key, value], arguments.length)
+    populateParserHintObject(self.nargs, false, 'narg', key, value)
+    return self
+  }
+
+  self.choices = function (key, value) {
+    argsert('<object|string|array> [string|array]', [key, value], arguments.length)
+    populateParserHintObject(self.choices, true, 'choices', key, value)
+    return self
+  }
+
+  self.alias = function (key, value) {
+    argsert('<object|string|array> [string|array]', [key, value], arguments.length)
+    populateParserHintObject(self.alias, true, 'alias', key, value)
+    return self
+  }
+
+  // TODO: actually deprecate self.defaults.
+  self.default = self.defaults = function (key, value, defaultDescription) {
+    argsert('<object|string|array> [*] [string]', [key, value, defaultDescription], arguments.length)
+    if (defaultDescription) options.defaultDescription[key] = defaultDescription
+    if (typeof value === 'function') {
+      if (!options.defaultDescription[key]) options.defaultDescription[key] = usage.functionDescription(value)
+      value = value.call()
+    }
+    populateParserHintObject(self.default, false, 'default', key, value)
+    return self
+  }
+
+  self.describe = function (key, desc) {
+    argsert('<object|string|array> [string]', [key, desc], arguments.length)
+    populateParserHintObject(self.describe, false, 'key', key, true)
+    usage.describe(key, desc)
+    return self
+  }
+
+  self.demandOption = function (keys, msg) {
+    argsert('<object|string|array> [string]', [keys, msg], arguments.length)
+    populateParserHintObject(self.demandOption, false, 'demandedOptions', keys, msg)
+    return self
+  }
+
+  self.coerce = function (keys, value) {
+    argsert('<object|string|array> [function]', [keys, value], arguments.length)
+    populateParserHintObject(self.coerce, false, 'coerce', keys, value)
+    return self
+  }
+
+  function populateParserHintObject (builder, isArray, type, key, value) {
+    if (Array.isArray(key)) {
+      // an array of keys with one value ['x', 'y', 'z'], function parse () {}
+      const temp = {}
+      key.forEach((k) => {
+        temp[k] = value
+      })
+      builder(temp)
+    } else if (typeof key === 'object') {
+      // an object of key value pairs: {'x': parse () {}, 'y': parse() {}}
+      Object.keys(key).forEach((k) => {
+        builder(k, key[k])
+      })
+    } else {
+      // a single key value pair 'x', parse() {}
+      if (isArray) {
+        options[type][key] = (options[type][key] || []).concat(value)
+      } else {
+        options[type][key] = value
+      }
+    }
+  }
+
+  function deleteFromParserHintObject (optionKey) {
+    // delete from all parsing hints:
+    // boolean, array, key, alias, etc.
+    Object.keys(options).forEach((hintKey) => {
+      const hint = options[hintKey]
+      if (Array.isArray(hint)) {
+        if (~hint.indexOf(optionKey)) hint.splice(hint.indexOf(optionKey), 1)
+      } else if (typeof hint === 'object') {
+        delete hint[optionKey]
+      }
+    })
+    // now delete the description from usage.js.
+    delete usage.getDescriptions()[optionKey]
+  }
+
+  self.config = function config (key, msg, parseFn) {
+    argsert('[object|string] [string|function] [function]', [key, msg, parseFn], arguments.length)
+    // allow a config object to be provided directly.
+    if (typeof key === 'object') {
+      key = applyExtends(key, cwd)
+      options.configObjects = (options.configObjects || []).concat(key)
+      return self
+    }
+
+    // allow for a custom parsing function.
+    if (typeof msg === 'function') {
+      parseFn = msg
+      msg = null
+    }
+
+    key = key || 'config'
+    self.describe(key, msg || usage.deferY18nLookup('Path to JSON config file'))
+    ;(Array.isArray(key) ? key : [key]).forEach((k) => {
+      options.config[k] = parseFn || true
+    })
+
+    return self
+  }
+
+  self.example = function (cmd, description) {
+    argsert('<string> [string]', [cmd, description], arguments.length)
+    usage.example(cmd, description)
+    return self
+  }
+
+  self.command = function (cmd, description, builder, handler, middlewares) {
+    argsert('<string|array|object> [string|boolean] [function|object] [function] [array]', [cmd, description, builder, handler, middlewares], arguments.length)
+    command.addHandler(cmd, description, builder, handler, middlewares)
+    return self
+  }
+
+  self.commandDir = function (dir, opts) {
+    argsert('<string> [object]', [dir, opts], arguments.length)
+    const req = parentRequire || require
+    command.addDirectory(dir, self.getContext(), req, require('get-caller-file')(), opts)
+    return self
+  }
+
+  // TODO: deprecate self.demand in favor of
+  // .demandCommand() .demandOption().
+  self.demand = self.required = self.require = function demand (keys, max, msg) {
+    // you can optionally provide a 'max' key,
+    // which will raise an exception if too many '_'
+    // options are provided.
+    if (Array.isArray(max)) {
+      max.forEach((key) => {
+        self.demandOption(key, msg)
+      })
+      max = Infinity
+    } else if (typeof max !== 'number') {
+      msg = max
+      max = Infinity
+    }
+
+    if (typeof keys === 'number') {
+      self.demandCommand(keys, max, msg, msg)
+    } else if (Array.isArray(keys)) {
+      keys.forEach((key) => {
+        self.demandOption(key, msg)
+      })
+    } else {
+      if (typeof msg === 'string') {
+        self.demandOption(keys, msg)
+      } else if (msg === true || typeof msg === 'undefined') {
+        self.demandOption(keys)
+      }
+    }
+
+    return self
+  }
+
+  self.demandCommand = function demandCommand (min, max, minMsg, maxMsg) {
+    argsert('[number] [number|string] [string|null|undefined] [string|null|undefined]', [min, max, minMsg, maxMsg], arguments.length)
+
+    if (typeof min === 'undefined') min = 1
+
+    if (typeof max !== 'number') {
+      minMsg = max
+      max = Infinity
+    }
+
+    self.global('_', false)
+
+    options.demandedCommands._ = {
+      min,
+      max,
+      minMsg,
+      maxMsg
+    }
+
+    return self
+  }
+
+  self.getDemandedOptions = () => {
+    argsert([], 0)
+    return options.demandedOptions
+  }
+
+  self.getDemandedCommands = () => {
+    argsert([], 0)
+    return options.demandedCommands
+  }
+
+  self.implies = function (key, value) {
+    argsert('<string|object> [number|string|array]', [key, value], arguments.length)
+    validation.implies(key, value)
+    return self
+  }
+
+  self.conflicts = function (key1, key2) {
+    argsert('<string|object> [string|array]', [key1, key2], arguments.length)
+    validation.conflicts(key1, key2)
+    return self
+  }
+
+  self.usage = function (msg, description, builder, handler) {
+    argsert('<string|null|undefined> [string|boolean] [function|object] [function]', [msg, description, builder, handler], arguments.length)
+
+    if (description !== undefined) {
+      // .usage() can be used as an alias for defining
+      // a default command.
+      if ((msg || '').match(/^\$0( |$)/)) {
+        return self.command(msg, description, builder, handler)
+      } else {
+        throw new YError('.usage() description must start with $0 if being used as alias for .command()')
+      }
+    } else {
+      usage.usage(msg)
+      return self
+    }
+  }
+
+  self.epilogue = self.epilog = function (msg) {
+    argsert('<string>', [msg], arguments.length)
+    usage.epilog(msg)
+    return self
+  }
+
+  self.fail = function (f) {
+    argsert('<function>', [f], arguments.length)
+    usage.failFn(f)
+    return self
+  }
+
+  self.check = function (f, _global) {
+    argsert('<function> [boolean]', [f, _global], arguments.length)
+    validation.check(f, _global !== false)
+    return self
+  }
+
+  self.global = function global (globals, global) {
+    argsert('<string|array> [boolean]', [globals, global], arguments.length)
+    globals = [].concat(globals)
+    if (global !== false) {
+      options.local = options.local.filter(l => globals.indexOf(l) === -1)
+    } else {
+      globals.forEach((g) => {
+        if (options.local.indexOf(g) === -1) options.local.push(g)
+      })
+    }
+    return self
+  }
+
+  self.pkgConf = function pkgConf (key, rootPath) {
+    argsert('<string> [string]', [key, rootPath], arguments.length)
+    let conf = null
+    // prefer cwd to require-main-filename in this method
+    // since we're looking for e.g. "nyc" config in nyc consumer
+    // rather than "yargs" config in nyc (where nyc is the main filename)
+    const obj = pkgUp(rootPath || cwd)
+
+    // If an object exists in the key, add it to options.configObjects
+    if (obj[key] && typeof obj[key] === 'object') {
+      conf = applyExtends(obj[key], rootPath || cwd)
+      options.configObjects = (options.configObjects || []).concat(conf)
+    }
+
+    return self
+  }
+
+  const pkgs = {}
+  function pkgUp (rootPath) {
+    const npath = rootPath || '*'
+    if (pkgs[npath]) return pkgs[npath]
+    const findUp = require('find-up')
+
+    let obj = {}
+    try {
+      let startDir = rootPath || require('require-main-filename')(parentRequire || require)
+
+      // When called in an environment that lacks require.main.filename, such as a jest test runner,
+      // startDir is already process.cwd(), and should not be shortened.
+      // Whether or not it is _actually_ a directory (e.g., extensionless bin) is irrelevant, find-up handles it.
+      if (!rootPath && path.extname(startDir)) {
+        startDir = path.dirname(startDir)
+      }
+
+      const pkgJsonPath = findUp.sync('package.json', {
+        cwd: startDir
+      })
+      obj = JSON.parse(fs.readFileSync(pkgJsonPath))
+    } catch (noop) {}
+
+    pkgs[npath] = obj || {}
+    return pkgs[npath]
+  }
+
+  let parseFn = null
+  let parseContext = null
+  self.parse = function parse (args, shortCircuit, _parseFn) {
+    argsert('[string|array] [function|boolean|object] [function]', [args, shortCircuit, _parseFn], arguments.length)
+    if (typeof args === 'undefined') args = processArgs
+
+    // a context object can optionally be provided, this allows
+    // additional information to be passed to a command handler.
+    if (typeof shortCircuit === 'object') {
+      parseContext = shortCircuit
+      shortCircuit = _parseFn
+    }
+
+    // by providing a function as a second argument to
+    // parse you can capture output that would otherwise
+    // default to printing to stdout/stderr.
+    if (typeof shortCircuit === 'function') {
+      parseFn = shortCircuit
+      shortCircuit = null
+    }
+    // completion short-circuits the parsing process,
+    // skipping validation, etc.
+    if (!shortCircuit) processArgs = args
+
+    freeze()
+    if (parseFn) exitProcess = false
+
+    const parsed = self._parseArgs(args, shortCircuit)
+    if (parseFn) parseFn(exitError, parsed, output)
+    unfreeze()
+
+    return parsed
+  }
+
+  self._getParseContext = () => parseContext || {}
+
+  self._hasParseCallback = () => !!parseFn
+
+  self.option = self.options = function option (key, opt) {
+    argsert('<string|object> [object]', [key, opt], arguments.length)
+    if (typeof key === 'object') {
+      Object.keys(key).forEach((k) => {
+        self.options(k, key[k])
+      })
+    } else {
+      if (typeof opt !== 'object') {
+        opt = {}
+      }
+
+      options.key[key] = true // track manually set keys.
+
+      if (opt.alias) self.alias(key, opt.alias)
+
+      const demand = opt.demand || opt.required || opt.require
+
+      // deprecated, use 'demandOption' instead
+      if (demand) {
+        self.demand(key, demand)
+      }
+
+      if (opt.demandOption) {
+        self.demandOption(key, typeof opt.demandOption === 'string' ? opt.demandOption : undefined)
+      }
+
+      if ('conflicts' in opt) {
+        self.conflicts(key, opt.conflicts)
+      }
+
+      if ('default' in opt) {
+        self.default(key, opt.default)
+      }
+
+      if ('implies' in opt) {
+        self.implies(key, opt.implies)
+      }
+
+      if ('nargs' in opt) {
+        self.nargs(key, opt.nargs)
+      }
+
+      if (opt.config) {
+        self.config(key, opt.configParser)
+      }
+
+      if (opt.normalize) {
+        self.normalize(key)
+      }
+
+      if ('choices' in opt) {
+        self.choices(key, opt.choices)
+      }
+
+      if ('coerce' in opt) {
+        self.coerce(key, opt.coerce)
+      }
+
+      if ('group' in opt) {
+        self.group(key, opt.group)
+      }
+
+      if (opt.boolean || opt.type === 'boolean') {
+        self.boolean(key)
+        if (opt.alias) self.boolean(opt.alias)
+      }
+
+      if (opt.array || opt.type === 'array') {
+        self.array(key)
+        if (opt.alias) self.array(opt.alias)
+      }
+
+      if (opt.number || opt.type === 'number') {
+        self.number(key)
+        if (opt.alias) self.number(opt.alias)
+      }
+
+      if (opt.string || opt.type === 'string') {
+        self.string(key)
+        if (opt.alias) self.string(opt.alias)
+      }
+
+      if (opt.count || opt.type === 'count') {
+        self.count(key)
+      }
+
+      if (typeof opt.global === 'boolean') {
+        self.global(key, opt.global)
+      }
+
+      if (opt.defaultDescription) {
+        options.defaultDescription[key] = opt.defaultDescription
+      }
+
+      if (opt.skipValidation) {
+        self.skipValidation(key)
+      }
+
+      const desc = opt.describe || opt.description || opt.desc
+      self.describe(key, desc)
+      if (opt.hidden) {
+        self.hide(key)
+      }
+
+      if (opt.requiresArg) {
+        self.requiresArg(key)
+      }
+    }
+
+    return self
+  }
+  self.getOptions = () => options
+
+  self.positional = function (key, opts) {
+    argsert('<string> <object>', [key, opts], arguments.length)
+    if (context.resets === 0) {
+      throw new YError(".positional() can only be called in a command's builder function")
+    }
+
+    // .positional() only supports a subset of the configuration
+    // options availble to .option().
+    const supportedOpts = ['default', 'implies', 'normalize',
+      'choices', 'conflicts', 'coerce', 'type', 'describe',
+      'desc', 'description', 'alias']
+    opts = objFilter(opts, (k, v) => {
+      let accept = supportedOpts.indexOf(k) !== -1
+      // type can be one of string|number|boolean.
+      if (k === 'type' && ['string', 'number', 'boolean'].indexOf(v) === -1) accept = false
+      return accept
+    })
+
+    // copy over any settings that can be inferred from the command string.
+    const fullCommand = context.fullCommands[context.fullCommands.length - 1]
+    const parseOptions = fullCommand ? command.cmdToParseOptions(fullCommand) : {
+      array: [],
+      alias: {},
+      default: {},
+      demand: {}
+    }
+    Object.keys(parseOptions).forEach((pk) => {
+      if (Array.isArray(parseOptions[pk])) {
+        if (parseOptions[pk].indexOf(key) !== -1) opts[pk] = true
+      } else {
+        if (parseOptions[pk][key] && !(pk in opts)) opts[pk] = parseOptions[pk][key]
+      }
+    })
+    self.group(key, usage.getPositionalGroupName())
+    return self.option(key, opts)
+  }
+
+  self.group = function group (opts, groupName) {
+    argsert('<string|array> <string>', [opts, groupName], arguments.length)
+    const existing = preservedGroups[groupName] || groups[groupName]
+    if (preservedGroups[groupName]) {
+      // we now only need to track this group name in groups.
+      delete preservedGroups[groupName]
+    }
+
+    const seen = {}
+    groups[groupName] = (existing || []).concat(opts).filter((key) => {
+      if (seen[key]) return false
+      return (seen[key] = true)
+    })
+    return self
+  }
+  // combine explicit and preserved groups. explicit groups should be first
+  self.getGroups = () => Object.assign({}, groups, preservedGroups)
+
+  // as long as options.envPrefix is not undefined,
+  // parser will apply env vars matching prefix to argv
+  self.env = function (prefix) {
+    argsert('[string|boolean]', [prefix], arguments.length)
+    if (prefix === false) options.envPrefix = undefined
+    else options.envPrefix = prefix || ''
+    return self
+  }
+
+  self.wrap = function (cols) {
+    argsert('<number|null|undefined>', [cols], arguments.length)
+    usage.wrap(cols)
+    return self
+  }
+
+  let strict = false
+  self.strict = function (enabled) {
+    argsert('[boolean]', [enabled], arguments.length)
+    strict = enabled !== false
+    return self
+  }
+  self.getStrict = () => strict
+
+  self.showHelp = function (level) {
+    argsert('[string|function]', [level], arguments.length)
+    if (!self.parsed) self._parseArgs(processArgs) // run parser, if it has not already been executed.
+    if (command.hasDefaultCommand()) {
+      context.resets++ // override the restriction on top-level positoinals.
+      command.runDefaultBuilderOn(self, true)
+    }
+    usage.showHelp(level)
+    return self
+  }
+
+  let versionOpt = null
+  self.version = function version (opt, msg, ver) {
+    const defaultVersionOpt = 'version'
+    argsert('[boolean|string] [string] [string]', [opt, msg, ver], arguments.length)
+
+    // nuke the key previously configured
+    // to return version #.
+    if (versionOpt) {
+      deleteFromParserHintObject(versionOpt)
+      usage.version(undefined)
+      versionOpt = null
+    }
+
+    if (arguments.length === 0) {
+      ver = guessVersion()
+      opt = defaultVersionOpt
+    } else if (arguments.length === 1) {
+      if (opt === false) { // disable default 'version' key.
+        return self
+      }
+      ver = opt
+      opt = defaultVersionOpt
+    } else if (arguments.length === 2) {
+      ver = msg
+      msg = null
+    }
+
+    versionOpt = typeof opt === 'string' ? opt : defaultVersionOpt
+    msg = msg || usage.deferY18nLookup('Show version number')
+
+    usage.version(ver || undefined)
+    self.boolean(versionOpt)
+    self.describe(versionOpt, msg)
+    return self
+  }
+
+  function guessVersion () {
+    const obj = pkgUp()
+
+    return obj.version || 'unknown'
+  }
+
+  let helpOpt = null
+  self.addHelpOpt = self.help = function addHelpOpt (opt, msg) {
+    const defaultHelpOpt = 'help'
+    argsert('[string|boolean] [string]', [opt, msg], arguments.length)
+
+    // nuke the key previously configured
+    // to return help.
+    if (helpOpt) {
+      deleteFromParserHintObject(helpOpt)
+      helpOpt = null
+    }
+
+    if (arguments.length === 1) {
+      if (opt === false) return self
+    }
+
+    // use arguments, fallback to defaults for opt and msg
+    helpOpt = typeof opt === 'string' ? opt : defaultHelpOpt
+    self.boolean(helpOpt)
+    self.describe(helpOpt, msg || usage.deferY18nLookup('Show help'))
+    return self
+  }
+
+  const defaultShowHiddenOpt = 'show-hidden'
+  options.showHiddenOpt = defaultShowHiddenOpt
+  self.addShowHiddenOpt = self.showHidden = function addShowHiddenOpt (opt, msg) {
+    argsert('[string|boolean] [string]', [opt, msg], arguments.length)
+
+    if (arguments.length === 1) {
+      if (opt === false) return self
+    }
+
+    const showHiddenOpt = typeof opt === 'string' ? opt : defaultShowHiddenOpt
+    self.boolean(showHiddenOpt)
+    self.describe(showHiddenOpt, msg || usage.deferY18nLookup('Show hidden options'))
+    options.showHiddenOpt = showHiddenOpt
+    return self
+  }
+
+  self.hide = function hide (key) {
+    argsert('<string|object>', [key], arguments.length)
+    options.hiddenOptions.push(key)
+    return self
+  }
+
+  self.showHelpOnFail = function showHelpOnFail (enabled, message) {
+    argsert('[boolean|string] [string]', [enabled, message], arguments.length)
+    usage.showHelpOnFail(enabled, message)
+    return self
+  }
+
+  var exitProcess = true
+  self.exitProcess = function (enabled) {
+    argsert('[boolean]', [enabled], arguments.length)
+    if (typeof enabled !== 'boolean') {
+      enabled = true
+    }
+    exitProcess = enabled
+    return self
+  }
+  self.getExitProcess = () => exitProcess
+
+  var completionCommand = null
+  self.completion = function (cmd, desc, fn) {
+    argsert('[string] [string|boolean|function] [function]', [cmd, desc, fn], arguments.length)
+
+    // a function to execute when generating
+    // completions can be provided as the second
+    // or third argument to completion.
+    if (typeof desc === 'function') {
+      fn = desc
+      desc = null
+    }
+
+    // register the completion command.
+    completionCommand = cmd || 'completion'
+    if (!desc && desc !== false) {
+      desc = 'generate bash completion script'
+    }
+    self.command(completionCommand, desc)
+
+    // a function can be provided
+    if (fn) completion.registerFunction(fn)
+
+    return self
+  }
+
+  self.showCompletionScript = function ($0) {
+    argsert('[string]', [$0], arguments.length)
+    $0 = $0 || self.$0
+    _logger.log(completion.generateCompletionScript($0, completionCommand))
+    return self
+  }
+
+  self.getCompletion = function (args, done) {
+    argsert('<array> <function>', [args, done], arguments.length)
+    completion.getCompletion(args, done)
+  }
+
+  self.locale = function (locale) {
+    argsert('[string]', [locale], arguments.length)
+    if (arguments.length === 0) {
+      guessLocale()
+      return y18n.getLocale()
+    }
+    detectLocale = false
+    y18n.setLocale(locale)
+    return self
+  }
+
+  self.updateStrings = self.updateLocale = function (obj) {
+    argsert('<object>', [obj], arguments.length)
+    detectLocale = false
+    y18n.updateLocale(obj)
+    return self
+  }
+
+  let detectLocale = true
+  self.detectLocale = function (detect) {
+    argsert('<boolean>', [detect], arguments.length)
+    detectLocale = detect
+    return self
+  }
+  self.getDetectLocale = () => detectLocale
+
+  var hasOutput = false
+  var exitError = null
+  // maybe exit, always capture
+  // context about why we wanted to exit.
+  self.exit = (code, err) => {
+    hasOutput = true
+    exitError = err
+    if (exitProcess) process.exit(code)
+  }
+
+  // we use a custom logger that buffers output,
+  // so that we can print to non-CLIs, e.g., chat-bots.
+  const _logger = {
+    log () {
+      const args = []
+      for (let i = 0; i < arguments.length; i++) args.push(arguments[i])
+      if (!self._hasParseCallback()) console.log.apply(console, args)
+      hasOutput = true
+      if (output.length) output += '\n'
+      output += args.join(' ')
+    },
+    error () {
+      const args = []
+      for (let i = 0; i < arguments.length; i++) args.push(arguments[i])
+      if (!self._hasParseCallback()) console.error.apply(console, args)
+      hasOutput = true
+      if (output.length) output += '\n'
+      output += args.join(' ')
+    }
+  }
+  self._getLoggerInstance = () => _logger
+  // has yargs output an error our help
+  // message in the current execution context.
+  self._hasOutput = () => hasOutput
+
+  self._setHasOutput = () => {
+    hasOutput = true
+  }
+
+  let recommendCommands
+  self.recommendCommands = function (recommend) {
+    argsert('[boolean]', [recommend], arguments.length)
+    recommendCommands = typeof recommend === 'boolean' ? recommend : true
+    return self
+  }
+
+  self.getUsageInstance = () => usage
+
+  self.getValidationInstance = () => validation
+
+  self.getCommandInstance = () => command
+
+  self.terminalWidth = () => {
+    argsert([], 0)
+    return typeof process.stdout.columns !== 'undefined' ? process.stdout.columns : null
+  }
+
+  Object.defineProperty(self, 'argv', {
+    get: () => self._parseArgs(processArgs),
+    enumerable: true
+  })
+
+  self._parseArgs = function parseArgs (args, shortCircuit, _skipValidation, commandIndex) {
+    let skipValidation = !!_skipValidation
+    args = args || processArgs
+
+    options.__ = y18n.__
+    options.configuration = pkgUp()['yargs'] || {}
+
+    const parsed = Parser.detailed(args, options)
+    let argv = parsed.argv
+    if (parseContext) argv = Object.assign({}, argv, parseContext)
+    const aliases = parsed.aliases
+
+    argv.$0 = self.$0
+    self.parsed = parsed
+
+    try {
+      guessLocale() // guess locale lazily, so that it can be turned off in chain.
+
+      // while building up the argv object, there
+      // are two passes through the parser. If completion
+      // is being performed short-circuit on the first pass.
+      if (shortCircuit) {
+        return argv
+      }
+
+      // if there's a handler associated with a
+      // command defer processing to it.
+      if (helpOpt) {
+        // consider any multi-char helpOpt alias as a valid help command
+        // unless all helpOpt aliases are single-char
+        // note that parsed.aliases is a normalized bidirectional map :)
+        const helpCmds = [helpOpt]
+          .concat(aliases[helpOpt] || [])
+          .filter(k => k.length > 1)
+        // check if help should trigger and strip it from _.
+        if (~helpCmds.indexOf(argv._[argv._.length - 1])) {
+          argv._.pop()
+          argv[helpOpt] = true
+        }
+      }
+      const handlerKeys = command.getCommands()
+      const skipDefaultCommand = argv[helpOpt] && (handlerKeys.length > 1 || handlerKeys[0] !== '$0')
+
+      if (argv._.length) {
+        if (handlerKeys.length) {
+          let firstUnknownCommand
+          for (let i = (commandIndex || 0), cmd; argv._[i] !== undefined; i++) {
+            cmd = String(argv._[i])
+            if (~handlerKeys.indexOf(cmd) && cmd !== completionCommand) {
+              setPlaceholderKeys(argv)
+              // commands are executed using a recursive algorithm that executes
+              // the deepest command first; we keep track of the position in the
+              // argv._ array that is currently being executed.
+              return command.runCommand(cmd, self, parsed, i + 1)
+            } else if (!firstUnknownCommand && cmd !== completionCommand) {
+              firstUnknownCommand = cmd
+              break
+            }
+          }
+
+          // run the default command, if defined
+          if (command.hasDefaultCommand() && !skipDefaultCommand) {
+            setPlaceholderKeys(argv)
+            return command.runCommand(null, self, parsed)
+          }
+
+          // recommend a command if recommendCommands() has
+          // been enabled, and no commands were found to execute
+          if (recommendCommands && firstUnknownCommand && !argv[helpOpt]) {
+            validation.recommendCommands(firstUnknownCommand, handlerKeys)
+          }
+        }
+
+        // generate a completion script for adding to ~/.bashrc.
+        if (completionCommand && ~argv._.indexOf(completionCommand) && !argv[completion.completionKey]) {
+          if (exitProcess) setBlocking(true)
+          self.showCompletionScript()
+          self.exit(0)
+        }
+      } else if (command.hasDefaultCommand() && !skipDefaultCommand) {
+        setPlaceholderKeys(argv)
+        return command.runCommand(null, self, parsed)
+      }
+
+      // we must run completions first, a user might
+      // want to complete the --help or --version option.
+      if (completion.completionKey in argv) {
+        if (exitProcess) setBlocking(true)
+
+        // we allow for asynchronous completions,
+        // e.g., loading in a list of commands from an API.
+        const completionArgs = args.slice(args.indexOf(`--${completion.completionKey}`) + 1)
+        completion.getCompletion(completionArgs, (completions) => {
+          ;(completions || []).forEach((completion) => {
+            _logger.log(completion)
+          })
+
+          self.exit(0)
+        })
+        return setPlaceholderKeys(argv)
+      }
+
+      // Handle 'help' and 'version' options
+      // if we haven't already output help!
+      if (!hasOutput) {
+        Object.keys(argv).forEach((key) => {
+          if (key === helpOpt && argv[key]) {
+            if (exitProcess) setBlocking(true)
+
+            skipValidation = true
+            self.showHelp('log')
+            self.exit(0)
+          } else if (key === versionOpt && argv[key]) {
+            if (exitProcess) setBlocking(true)
+
+            skipValidation = true
+            usage.showVersion()
+            self.exit(0)
+          }
+        })
+      }
+
+      // Check if any of the options to skip validation were provided
+      if (!skipValidation && options.skipValidation.length > 0) {
+        skipValidation = Object.keys(argv).some(key => options.skipValidation.indexOf(key) >= 0 && argv[key] === true)
+      }
+
+      // If the help or version options where used and exitProcess is false,
+      // or if explicitly skipped, we won't run validations.
+      if (!skipValidation) {
+        if (parsed.error) throw new YError(parsed.error.message)
+
+        // if we're executed via bash completion, don't
+        // bother with validation.
+        if (!argv[completion.completionKey]) {
+          self._runValidation(argv, aliases, {}, parsed.error)
+        }
+      }
+    } catch (err) {
+      if (err instanceof YError) usage.fail(err.message, err)
+      else throw err
+    }
+
+    return setPlaceholderKeys(argv)
+  }
+
+  self._runValidation = function runValidation (argv, aliases, positionalMap, parseErrors) {
+    if (parseErrors) throw new YError(parseErrors.message)
+    validation.nonOptionCount(argv)
+    validation.requiredArguments(argv)
+    if (strict) validation.unknownArguments(argv, aliases, positionalMap)
+    validation.customChecks(argv, aliases)
+    validation.limitedChoices(argv)
+    validation.implications(argv)
+    validation.conflicting(argv)
+  }
+
+  function guessLocale () {
+    if (!detectLocale) return
+
+    try {
+      const osLocale = require('os-locale')
+      self.locale(osLocale.sync({ spawn: false }))
+    } catch (err) {
+      // if we explode looking up locale just noop
+      // we'll keep using the default language 'en'.
+    }
+  }
+
+  function setPlaceholderKeys (argv) {
+    Object.keys(options.key).forEach((key) => {
+      // don't set placeholder keys for dot
+      // notation options 'foo.bar'.
+      if (~key.indexOf('.')) return
+      if (typeof argv[key] === 'undefined') argv[key] = undefined
+    })
+    return argv
+  }
+
+  // an app should almost always have --version and --help,
+  // if you *really* want to disable this use .help(false)/.version(false).
+  self.help()
+  self.version()
+
+  return self
+}
+
+// rebase an absolute path to a relative one with respect to a base directory
+// exported for tests
+exports.rebase = rebase
+function rebase (base, dir) {
+  return path.relative(base, dir)
+}
-- 
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