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| const assign = require('./lib/assign')
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')
var exports = module.exports = Yargs
function Yargs (processArgs, cwd, parentRequire) {
processArgs = processArgs || [] // handle calling yargs().
const self = {}
var command = null
var completion = null
var groups = {}
var output = ''
var preservedGroups = {}
var usage = null
var validation = null
const y18n = Y18n({
directory: path.resolve(__dirname, './locales'),
updateFiles: false
})
Eif (!cwd) cwd = process.cwd()
self.$0 = process.argv
.slice(0, 2)
.map(function (x, i) {
// ignore the node bin, specify this in your
// bin file with #!/usr/bin/env node
if (i === 0 && /\b(node|iojs)(\.exe)?$/.test(x)) return
var b = rebase(cwd, x)
return x.match(/^(\/|([a-zA-Z]:)?\\)/) && b.length < x.length ? b : x
})
.join(' ').trim()
Iif (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: [], files: [] }
self.getContext = function () {
return context
}
// puts yargs back into an initial state. any keys
// that have been set to "global" will not be reset
// by this action.
var options
self.resetOptions = self.reset = function (aliases) {
context.resets++
aliases = aliases || {}
options = options || {}
// put yargs back into an initial state, this
// logic is used to build a nested command
// hierarchy.
var tmpOptions = {}
tmpOptions.global = options.global ? options.global : []
tmpOptions.configObjects = options.configObjects ? options.configObjects : []
// if a key has been set as a global, we
// do not want to reset it or its aliases.
var globalLookup = {}
tmpOptions.global.forEach(function (g) {
globalLookup[g] = true
;(aliases[g] || []).forEach(function (a) {
globalLookup[a] = true
})
})
// preserve groups containing global keys
preservedGroups = Object.keys(groups).reduce(function (acc, groupName) {
var keys = groups[groupName].filter(function (key) {
return key in globalLookup
})
if (keys.length > 0) {
acc[groupName] = keys
}
return acc
}, {})
// groups can now be reset
groups = {}
var arrayOptions = [
'array', 'boolean', 'string', 'requiresArg', 'skipValidation',
'count', 'normalize', 'number'
]
var objectOptions = [
'narg', 'key', 'alias', 'default', 'defaultDescription',
'config', 'choices', 'demanded', 'coerce'
]
arrayOptions.forEach(function (k) {
tmpOptions[k] = (options[k] || []).filter(function (k) {
return globalLookup[k]
})
})
objectOptions.forEach(function (k) {
tmpOptions[k] = objFilter(options[k], function (k, v) {
return globalLookup[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(globalLookup) : Usage(self, y18n)
validation = validation ? validation.reset(globalLookup) : Validation(self, usage, y18n)
command = command ? command.reset() : Command(self, usage, validation)
Eif (!completion) completion = Completion(self, usage, command)
strict = false
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)
var 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 (bools) {
options.boolean.push.apply(options.boolean, [].concat(bools))
return self
}
self.array = function (arrays) {
options.array.push.apply(options.array, [].concat(arrays))
return self
}
self.nargs = function (key, n) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (k) {
self.nargs(k, key[k])
})
} else {
options.narg[key] = n
}
return self
}
self.number = function (numbers) {
options.number.push.apply(options.number, [].concat(numbers))
return self
}
self.choices = function (key, values) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (k) {
self.choices(k, key[k])
})
} else {
options.choices[key] = (options.choices[key] || []).concat(values)
}
return self
}
self.normalize = function (strings) {
options.normalize.push.apply(options.normalize, [].concat(strings))
return self
}
self.config = function (key, msg, parseFn) {
// allow to pass a configuration object
if (typeof key === 'object') {
options.configObjects = (options.configObjects || []).concat(key)
return self
}
// allow to provide a 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(function (k) {
options.config[k] = parseFn || true
})
return self
}
self.example = function (cmd, description) {
usage.example(cmd, description)
return self
}
self.command = function (cmd, description, builder, handler) {
command.addHandler(cmd, description, builder, handler)
return self
}
self.commandDir = function (dir, opts) {
const req = parentRequire || require
command.addDirectory(dir, self.getContext(), req, require('get-caller-file')(), opts)
return self
}
self.string = function (strings) {
options.string.push.apply(options.string, [].concat(strings))
return self
}
// The 'defaults' alias is deprecated. It will be removed in the next major version.
self.default = self.defaults = function (key, value, defaultDescription) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (k) {
self.default(k, key[k])
})
} else {
if (defaultDescription) options.defaultDescription[key] = defaultDescription
if (typeof value === 'function') {
if (!options.defaultDescription[key]) options.defaultDescription[key] = usage.functionDescription(value)
value = value.call()
}
options.default[key] = value
}
return self
}
self.alias = function (x, y) {
if (typeof x === 'object') {
Object.keys(x).forEach(function (key) {
self.alias(key, x[key])
})
} else {
options.alias[x] = (options.alias[x] || []).concat(y)
}
return self
}
self.coerce = function (key, fn) {
if (typeof key === 'object' && !Array.isArray(key)) {
Object.keys(key).forEach(function (k) {
self.coerce(k, key[k])
})
} else {
[].concat(key).forEach(function (k) {
options.coerce[k] = fn
})
}
return self
}
self.count = function (counts) {
options.count.push.apply(options.count, [].concat(counts))
return self
}
self.demand = self.required = self.require = function (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(function (key) {
self.demand(key, msg)
})
max = Infinity
} else if (typeof max !== 'number') {
msg = max
max = Infinity
}
if (typeof keys === 'number') {
if (!options.demanded._) options.demanded._ = { count: 0, msg: null, max: max }
options.demanded._.count = keys
options.demanded._.msg = msg
} else if (Array.isArray(keys)) {
keys.forEach(function (key) {
self.demand(key, msg)
})
} else {
if (typeof msg === 'string') {
options.demanded[keys] = { msg: msg }
} else if (msg === true || typeof msg === 'undefined') {
options.demanded[keys] = { msg: undefined }
}
}
return self
}
self.getDemanded = function () {
return options.demanded
}
self.requiresArg = function (requiresArgs) {
options.requiresArg.push.apply(options.requiresArg, [].concat(requiresArgs))
return self
}
self.skipValidation = function (skipValidations) {
options.skipValidation.push.apply(options.skipValidation, [].concat(skipValidations))
return self
}
self.implies = function (key, value) {
validation.implies(key, value)
return self
}
self.usage = function (msg, opts) {
if (!opts && typeof msg === 'object') {
opts = msg
msg = null
}
usage.usage(msg)
if (opts) self.options(opts)
return self
}
self.epilogue = self.epilog = function (msg) {
usage.epilog(msg)
return self
}
self.fail = function (f) {
usage.failFn(f)
return self
}
self.check = function (f) {
validation.check(f)
return self
}
self.describe = function (key, desc) {
options.key[key] = true
usage.describe(key, desc)
return self
}
self.global = function (globals) {
options.global.push.apply(options.global, [].concat(globals))
return self
}
self.pkgConf = function (key, path) {
var conf = null
var obj = pkgUp(path)
// If an object exists in the key, add it to options.configObjects
if (obj[key] && typeof obj[key] === 'object') {
conf = obj[key]
options.configObjects = (options.configObjects || []).concat(conf)
}
return self
}
var pkgs = {}
function pkgUp (path) {
var npath = path || '*'
if (pkgs[npath]) return pkgs[npath]
const readPkgUp = require('read-pkg-up')
var obj = {}
try {
obj = readPkgUp.sync({
cwd: path || require('require-main-filename')(parentRequire || require)
})
} catch (noop) {}
pkgs[npath] = obj.pkg || {}
return pkgs[npath]
}
var parseFn = null
var parseContext = null
self.parse = function (args, shortCircuit, _parseFn) {
// 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) {
freeze()
exitProcess = false
}
var parsed = parseArgs(args, shortCircuit)
if (parseFn) {
parseFn(exitError, parsed, output)
unfreeze()
}
return parsed
}
self._hasParseCallback = function () {
return !!parseFn
}
self.option = self.options = function (key, opt) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (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)
var demand = opt.demand || opt.required || opt.require
if (demand) {
self.demand(key, demand)
}
if ('config' in opt) {
self.config(key, opt.configParser)
}
if ('default' in opt) {
self.default(key, opt.default)
}
if ('nargs' in opt) {
self.nargs(key, opt.nargs)
}
if ('normalize' in opt) {
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.global) {
self.global(key)
}
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 (opt.defaultDescription) {
options.defaultDescription[key] = opt.defaultDescription
}
if (opt.skipValidation) {
self.skipValidation(key)
}
var desc = opt.describe || opt.description || opt.desc
if (desc) {
self.describe(key, desc)
}
if (opt.requiresArg) {
self.requiresArg(key)
}
}
return self
}
self.getOptions = function () {
return options
}
self.group = function (opts, groupName) {
var existing = preservedGroups[groupName] || groups[groupName]
if (preservedGroups[groupName]) {
// the preserved group will be moved to the set of explicitly declared
// groups
delete preservedGroups[groupName]
}
var seen = {}
groups[groupName] = (existing || []).concat(opts).filter(function (key) {
if (seen[key]) return false
return (seen[key] = true)
})
return self
}
self.getGroups = function () {
// combine explicit and preserved groups. explicit groups should be first
return assign(groups, preservedGroups)
}
// as long as options.envPrefix is not undefined,
// parser will apply env vars matching prefix to argv
self.env = function (prefix) {
if (prefix === false) options.envPrefix = undefined
else options.envPrefix = prefix || ''
return self
}
self.wrap = function (cols) {
usage.wrap(cols)
return self
}
var strict = false
self.strict = function () {
strict = true
return self
}
self.getStrict = function () {
return strict
}
self.showHelp = function (level) {
if (!self.parsed) parseArgs(processArgs) // run parser, if it has not already been executed.
usage.showHelp(level)
return self
}
var versionOpt = null
self.version = function (opt, msg, ver) {
if (arguments.length === 0) {
ver = guessVersion()
opt = 'version'
} else if (arguments.length === 1) {
ver = opt
opt = 'version'
} else if (arguments.length === 2) {
ver = msg
}
versionOpt = opt
msg = msg || usage.deferY18nLookup('Show version number')
usage.version(ver || undefined)
self.boolean(versionOpt)
self.global(versionOpt)
self.describe(versionOpt, msg)
return self
}
function guessVersion () {
var obj = pkgUp()
return obj.version || 'unknown'
}
var helpOpt = null
var useHelpOptAsCommand = false // a call to .help() will enable this
self.addHelpOpt = self.help = function (opt, msg, addImplicitCmd) {
// argument shuffle
if (arguments.length === 0) {
useHelpOptAsCommand = true
} else if (arguments.length === 1) {
if (typeof opt === 'boolean') {
useHelpOptAsCommand = opt
opt = null
} else {
useHelpOptAsCommand = true
}
} else if (arguments.length === 2) {
if (typeof msg === 'boolean') {
useHelpOptAsCommand = msg
msg = null
} else {
useHelpOptAsCommand = true
}
} else {
useHelpOptAsCommand = Boolean(addImplicitCmd)
}
// use arguments, fallback to defaults for opt and msg
helpOpt = opt || 'help'
self.boolean(helpOpt)
self.global(helpOpt)
self.describe(helpOpt, msg || usage.deferY18nLookup('Show help'))
return self
}
self.showHelpOnFail = function (enabled, message) {
usage.showHelpOnFail(enabled, message)
return self
}
var exitProcess = true
self.exitProcess = function (enabled) {
if (typeof enabled !== 'boolean') {
enabled = true
}
exitProcess = enabled
return self
}
self.getExitProcess = function () {
return exitProcess
}
var completionCommand = null
self.completion = function (cmd, desc, fn) {
// 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) {
$0 = $0 || self.$0
_logger.log(completion.generateCompletionScript($0))
return self
}
self.getCompletion = function (args, done) {
completion.getCompletion(args, done)
}
self.locale = function (locale) {
Iif (arguments.length === 0) {
guessLocale()
return y18n.getLocale()
}
detectLocale = false
y18n.setLocale(locale)
return self
}
self.updateStrings = self.updateLocale = function (obj) {
detectLocale = false
y18n.updateLocale(obj)
return self
}
var detectLocale = true
self.detectLocale = function (detect) {
detectLocale = detect
return self
}
self.getDetectLocale = function () {
return detectLocale
}
var hasOutput = false
var exitError = null
// maybe exit, always capture
// context about why we wanted to exit.
self.exit = function (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.
var _logger = {
log: function () {
var args = Array.prototype.slice.call(arguments)
if (!self._hasParseCallback()) console.log.apply(console, args)
hasOutput = true
if (output.length) output += '\n'
output += args.join(' ')
},
error: function () {
var args = Array.prototype.slice.call(arguments)
if (!self._hasParseCallback()) console.error.apply(console, args)
hasOutput = true
if (output.length) output += '\n'
output += args.join(' ')
}
}
self._getLoggerInstance = function () {
return _logger
}
// has yargs output an error our help
// message in the current execution context.
self._hasOutput = function () {
return hasOutput
}
var recommendCommands
self.recommendCommands = function () {
recommendCommands = true
return self
}
self.getUsageInstance = function () {
return usage
}
self.getValidationInstance = function () {
return validation
}
self.getCommandInstance = function () {
return command
}
self.terminalWidth = function () {
return require('window-size').width
}
Object.defineProperty(self, 'argv', {
get: function () {
var args = null
try {
args = parseArgs(processArgs)
} catch (err) {
usage.fail(err.message, err)
}
return args
},
enumerable: true
})
function parseArgs (args, shortCircuit) {
options.__ = y18n.__
options.configuration = pkgUp(cwd)['yargs'] || {}
const parsed = Parser.detailed(args, options)
var argv = parsed.argv
Iif (parseContext) argv = assign(parseContext, argv)
var aliases = parsed.aliases
argv.$0 = self.$0
self.parsed = parsed
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.
Iif (shortCircuit) {
return argv
}
Iif (argv._.length) {
// check for helpOpt in argv._ before running commands
// assumes helpOpt must be valid if useHelpOptAsCommand is true
if (useHelpOptAsCommand) {
// 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 :)
var helpCmds = [helpOpt].concat(aliases[helpOpt])
var multiCharHelpCmds = helpCmds.filter(function (k) {
return k.length > 1
})
if (multiCharHelpCmds.length) helpCmds = multiCharHelpCmds
// look for and strip any helpCmds from argv._
argv._ = argv._.filter(function (cmd) {
if (~helpCmds.indexOf(cmd)) {
argv[helpOpt] = true
return false
}
return true
})
}
// if there's a handler associated with a
// command defer processing to it.
var handlerKeys = command.getCommands()
if (handlerKeys.length) {
var firstUnknownCommand
for (var i = 0, cmd; (cmd = argv._[i]) !== undefined; i++) {
if (~handlerKeys.indexOf(cmd) && cmd !== completionCommand) {
setPlaceholderKeys(argv)
return command.runCommand(cmd, self, parsed)
} else if (!firstUnknownCommand && cmd !== completionCommand) {
firstUnknownCommand = cmd
}
}
// recommend a command if recommendCommands() has
// been enabled, and no commands were found to execute
if (recommendCommands && firstUnknownCommand) {
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)
}
}
// we must run completions first, a user might
// want to complete the --help or --version option.
Iif (completion.completionKey in argv) {
if (exitProcess) setBlocking(true)
// we allow for asynchronous completions,
// e.g., loading in a list of commands from an API.
var completionArgs = args.slice(args.indexOf('--' + completion.completionKey) + 1)
completion.getCompletion(completionArgs, function (completions) {
;(completions || []).forEach(function (completion) {
_logger.log(completion)
})
self.exit(0)
})
return setPlaceholderKeys(argv)
}
var skipValidation = false
// Handle 'help' and 'version' options
Object.keys(argv).forEach(function (key) {
Iif (key === helpOpt && argv[key]) {
if (exitProcess) setBlocking(true)
skipValidation = true
self.showHelp('log')
self.exit(0)
} else Iif (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
Iif (!skipValidation && options.skipValidation.length > 0) {
skipValidation = Object.keys(argv).some(function (key) {
return 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
Eif (!skipValidation) {
Iif (parsed.error) throw parsed.error
// if we're executed via bash completion, don't
// bother with validation.
Eif (!argv[completion.completionKey]) {
validation.nonOptionCount(argv)
validation.missingArgumentValue(argv)
validation.requiredArguments(argv)
Iif (strict) validation.unknownArguments(argv, aliases)
validation.customChecks(argv, aliases)
validation.limitedChoices(argv)
validation.implications(argv)
}
}
return setPlaceholderKeys(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(function (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
}
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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