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Edit File : yargs.js \| Size : 38.39 KB
'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 { globalMiddlewareFactory } = require('./lib/middleware') 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 globalMiddleware = [] let output = '' let preservedGroups = {} let usage = null let validation = null const y18n = Y18n({ directory: path.resolve(__dirname, './locales'), updateFiles: false }) self.middleware = globalMiddlewareFactory(globalMiddleware, self) if (!cwd) cwd = process.cwd() self.scriptName = function (scriptName) { self.customScriptName = true self.$0 = scriptName return self } // ignore the node bin, specify this in your // bin file with #!/usr/bin/env node if (/\b(node\|iojs\|electron)(\.exe)?$/.test(process.argv[0])) { self.$0 = process.argv.slice(1, 2) } else { self.$0 = process.argv.slice(0, 1) } self.$0 = self.$0 .map((x, i) => { 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 }) }) // add all groups not set to local to preserved groups Object.assign( 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, globalMiddleware) 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 frozens = [] function freeze () { let frozen = {} frozens.push(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 frozen.parseFn = parseFn frozen.parseContext = parseContext } function unfreeze () { let frozen = frozens.pop() 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 = frozen.parseFn parseContext = frozen.parseContext } 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) => { key = sanitizeKey(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)) { const temp = Object.create(null) // an array of keys with one value ['x', 'y', 'z'], function parse () {} 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 { key = sanitizeKey(key) // a single key value pair 'x', parse() {} if (isArray) { options[type][key] = (options[type][key] \|\| []).concat(value) } else { options[type][key] = value } } } // TODO(bcoe): in future major versions move more objects towards // Object.create(null): function sanitizeKey (key) { if (key === '__proto__') return '___proto___' return key } 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, self.getParserConfiguration()['deep-merge-config']) 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, self.getParserConfiguration()['deep-merge-config']) 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) freeze() if (typeof args === 'undefined') { const argv = self._parseArgs(processArgs) const tmpParsed = self.parsed unfreeze() // TODO: remove this compatibility hack when we release yargs@15.x: self.parsed = tmpParsed return argv } // 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 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 available to .option(). const supportedOpts = ['default', 'defaultDescription', '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 let parserConfig = {} self.parserConfiguration = function parserConfiguration (config) { argsert('<object>', [config], arguments.length) parserConfig = config return self } self.getParserConfiguration = () => parserConfig 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 \|\| completionCommand \|\| 'completion' if (!desc && desc !== false) { desc = 'generate completion script' } self.command(completionCommand, desc) // a function can be provided if (fn) completion.registerFunction(fn) return self } self.showCompletionScript = function ($0, cmd) { argsert('[string] [string]', [$0, cmd], arguments.length) $0 = $0 \|\| self.$0 _logger.log(completion.generateCompletionScript($0, cmd \|\| completionCommand \|\| 'completion')) 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, _calledFromCommand, commandIndex) { let skipValidation = !!_calledFromCommand args = args \|\| processArgs options.__ = y18n.__ options.configuration = self.getParserConfiguration() // Deprecated let pkgConfig = pkgUp()['yargs'] if (pkgConfig) { console.warn('Configuring yargs through package.json is deprecated and will be removed in a future major release, please use the JS API instead.') options.configuration = Object.assign({}, pkgConfig, options.configuration) } const populateDoubleDash = !!options.configuration['populate--'] const config = Object.assign({}, options.configuration, { 'populate--': true }) const parsed = Parser.detailed(args, Object.assign({}, options, { configuration: config })) 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 (populateDoubleDash \|\| _calledFromCommand) ? argv : self._copyDoubleDash(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 requestCompletions = completion.completionKey in argv const skipRecommendation = argv[helpOpt] \|\| requestCompletions const skipDefaultCommand = skipRecommendation && (handlerKeys.length > 1 \|\| handlerKeys[0] !== '$0') if (argv._.length) { if (handlerKeys.length) { let firstUnknownCommand for (let i = (commandIndex \|\| 0), cmd; argv._[i] !== undefined; i++) { cmd = String(argv._[i]) if (~handlerKeys.indexOf(cmd) && cmd !== completionCommand) { // commands are executed using a recursive algorithm that executes // the deepest command first; we keep track of the position in the // argv._ array that is currently being executed. const innerArgv = command.runCommand(cmd, self, parsed, i + 1) return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv) } else if (!firstUnknownCommand && cmd !== completionCommand) { firstUnknownCommand = cmd break } } // run the default command, if defined if (command.hasDefaultCommand() && !skipDefaultCommand) { const innerArgv = command.runCommand(null, self, parsed) return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv) } // recommend a command if recommendCommands() has // been enabled, and no commands were found to execute if (recommendCommands && firstUnknownCommand && !skipRecommendation) { validation.recommendCommands(firstUnknownCommand, handlerKeys) } } // generate a completion script for adding to ~/.bashrc. if (completionCommand && ~argv._.indexOf(completionCommand) && !requestCompletions) { if (exitProcess) setBlocking(true) self.showCompletionScript() self.exit(0) } } else if (command.hasDefaultCommand() && !skipDefaultCommand) { const innerArgv = command.runCommand(null, self, parsed) return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv) } // we must run completions first, a user might // want to complete the --help or --version option. if (requestCompletions) { if (exitProcess) setBlocking(true) // we allow for asynchronous completions, // e.g., loading in a list of commands from an API. const completionArgs = args.slice(args.indexOf(`--${completion.completionKey}`) + 1) completion.getCompletion(completionArgs, (completions) => { ;(completions \|\| []).forEach((completion) => { _logger.log(completion) }) self.exit(0) }) return (populateDoubleDash \|\| _calledFromCommand) ? argv : self._copyDoubleDash(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 (!requestCompletions) { self._runValidation(argv, aliases, {}, parsed.error) } } } catch (err) { if (err instanceof YError) usage.fail(err.message, err) else throw err } return (populateDoubleDash \|\| _calledFromCommand) ? argv : self._copyDoubleDash(argv) } // to simplify the parsing of positionals in commands, // we temporarily populate '--' rather than _, with arguments // after the '--' directive. After the parse, we copy these back. self._copyDoubleDash = function (argv) { if (!argv._ \|\| !argv['--']) return argv argv._.push.apply(argv._, argv['--']) // TODO(bcoe): refactor command parsing such that this delete is not // necessary: https://github.com/yargs/yargs/issues/1482 try { delete argv['--'] } catch (_err) {} return argv } self._runValidation = function runValidation (argv, aliases, positionalMap, parseErrors) { if (parseErrors) throw new YError(parseErrors.message \|\| parseErrors) 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 { env } = process const locale = env.LC_ALL \|\| env.LC_MESSAGES \|\| env.LANG \|\| env.LANGUAGE \|\| 'en_US' self.locale(locale.replace(/[.:]./, '')) } catch (err) { // if we explode looking up locale just noop // we'll keep using the default language 'en'. } } // 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) } Back

Edit File : yargs.js | Size : 38.39 KB

'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 { globalMiddlewareFactory } = require('./lib/middleware')
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 globalMiddleware = []
  let output = ''
  let preservedGroups = {}
  let usage = null
  let validation = null

const y18n = Y18n({
    directory: path.resolve(__dirname, './locales'),
    updateFiles: false
  })

self.middleware = globalMiddlewareFactory(globalMiddleware, self)

if (!cwd) cwd = process.cwd()

self.scriptName = function (scriptName) {
    self.customScriptName = true
    self.$0 = scriptName
    return self
  }

// ignore the node bin, specify this in your
  // bin file with #!/usr/bin/env node
  if (/\b(node|iojs|electron)(\.exe)?$/.test(process.argv[0])) {
    self.$0 = process.argv.slice(1, 2)
  } else {
    self.$0 = process.argv.slice(0, 1)
  }

self.$0 = self.$0
    .map((x, i) => {
      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
      })
    })

// add all groups not set to local to preserved groups
    Object.assign(
      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, globalMiddleware)
    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 frozens = []
  function freeze () {
    let frozen = {}
    frozens.push(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
    frozen.parseFn = parseFn
    frozen.parseContext = parseContext
  }
  function unfreeze () {
    let frozen = frozens.pop()
    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 = frozen.parseFn
    parseContext = frozen.parseContext
  }

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) => {
      key = sanitizeKey(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)) {
      const temp = Object.create(null)
      // an array of keys with one value ['x', 'y', 'z'], function parse () {}
      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 {
      key = sanitizeKey(key)
      // a single key value pair 'x', parse() {}
      if (isArray) {
        options[type][key] = (options[type][key] || []).concat(value)
      } else {
        options[type][key] = value
      }
    }
  }

// TODO(bcoe): in future major versions move more objects towards
  // Object.create(null):
  function sanitizeKey (key) {
    if (key === '__proto__') return '___proto___'
    return key
  }

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, self.getParserConfiguration()['deep-merge-config'])
      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, self.getParserConfiguration()['deep-merge-config'])
      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)
    freeze()
    if (typeof args === 'undefined') {
      const argv = self._parseArgs(processArgs)
      const tmpParsed = self.parsed
      unfreeze()
      // TODO: remove this compatibility hack when we release yargs@15.x:
      self.parsed = tmpParsed
      return argv
    }

// 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

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 available to .option().
    const supportedOpts = ['default', 'defaultDescription', '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

let parserConfig = {}
  self.parserConfiguration = function parserConfiguration (config) {
    argsert('<object>', [config], arguments.length)
    parserConfig = config
    return self
  }
  self.getParserConfiguration = () => parserConfig

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 || completionCommand || 'completion'
    if (!desc && desc !== false) {
      desc = 'generate completion script'
    }
    self.command(completionCommand, desc)

// a function can be provided
    if (fn) completion.registerFunction(fn)

return self
  }

self.showCompletionScript = function ($0, cmd) {
    argsert('[string] [string]', [$0, cmd], arguments.length)
    $0 = $0 || self.$0
    _logger.log(completion.generateCompletionScript($0, cmd || completionCommand || 'completion'))
    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, _calledFromCommand, commandIndex) {
    let skipValidation = !!_calledFromCommand
    args = args || processArgs

options.__ = y18n.__
    options.configuration = self.getParserConfiguration()
    // Deprecated
    let pkgConfig = pkgUp()['yargs']
    if (pkgConfig) {
      console.warn('Configuring yargs through package.json is deprecated and will be removed in a future major release, please use the JS API instead.')
      options.configuration = Object.assign({}, pkgConfig, options.configuration)
    }

const populateDoubleDash = !!options.configuration['populate--']
    const config = Object.assign({}, options.configuration, {
      'populate--': true
    })
    const parsed = Parser.detailed(args, Object.assign({}, options, {
      configuration: config
    }))

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 (populateDoubleDash || _calledFromCommand) ? argv : self._copyDoubleDash(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 requestCompletions = completion.completionKey in argv
      const skipRecommendation = argv[helpOpt] || requestCompletions
      const skipDefaultCommand = skipRecommendation && (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) {
              // 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.
              const innerArgv = command.runCommand(cmd, self, parsed, i + 1)
              return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv)
            } else if (!firstUnknownCommand && cmd !== completionCommand) {
              firstUnknownCommand = cmd
              break
            }
          }

// run the default command, if defined
          if (command.hasDefaultCommand() && !skipDefaultCommand) {
            const innerArgv = command.runCommand(null, self, parsed)
            return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv)
          }

// recommend a command if recommendCommands() has
          // been enabled, and no commands were found to execute
          if (recommendCommands && firstUnknownCommand && !skipRecommendation) {
            validation.recommendCommands(firstUnknownCommand, handlerKeys)
          }
        }

// generate a completion script for adding to ~/.bashrc.
        if (completionCommand && ~argv._.indexOf(completionCommand) && !requestCompletions) {
          if (exitProcess) setBlocking(true)
          self.showCompletionScript()
          self.exit(0)
        }
      } else if (command.hasDefaultCommand() && !skipDefaultCommand) {
        const innerArgv = command.runCommand(null, self, parsed)
        return populateDoubleDash ? innerArgv : self._copyDoubleDash(innerArgv)
      }

// we must run completions first, a user might
      // want to complete the --help or --version option.
      if (requestCompletions) {
        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 (populateDoubleDash || _calledFromCommand) ? argv : self._copyDoubleDash(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 (!requestCompletions) {
          self._runValidation(argv, aliases, {}, parsed.error)
        }
      }
    } catch (err) {
      if (err instanceof YError) usage.fail(err.message, err)
      else throw err
    }

return (populateDoubleDash || _calledFromCommand) ? argv : self._copyDoubleDash(argv)
  }

// to simplify the parsing of positionals in commands,
  // we temporarily populate '--' rather than _, with arguments
  // after the '--' directive. After the parse, we copy these back.
  self._copyDoubleDash = function (argv) {
    if (!argv._ || !argv['--']) return argv
    argv._.push.apply(argv._, argv['--'])

// TODO(bcoe): refactor command parsing such that this delete is not
    // necessary: https://github.com/yargs/yargs/issues/1482
    try {
      delete argv['--']
    } catch (_err) {}

return argv
  }

self._runValidation = function runValidation (argv, aliases, positionalMap, parseErrors) {
    if (parseErrors) throw new YError(parseErrors.message || parseErrors)
    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 { env } = process
      const locale = env.LC_ALL || env.LC_MESSAGES || env.LANG || env.LANGUAGE || 'en_US'
      self.locale(locale.replace(/[.:].*/, ''))
    } catch (err) {
      // if we explode looking up locale just noop
      // we'll keep using the default language 'en'.
    }
  }

// 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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