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var assert = require('assert')
var Completion = require('./lib/completion')
var Parser = require('./lib/parser')
var path = require('path')
var tokenizeArgString = require('./lib/tokenize-arg-string')
var Usage = require('./lib/usage')
var Validation = require('./lib/validation')
var Y18n = require('y18n')
Argv(process.argv.slice(2))
var exports = module.exports = Argv
function Argv (processArgs, cwd) {
processArgs = processArgs || [] // handle calling yargs().
var self = {}
var completion = null
var usage = null
var validation = null
var y18n = Y18n({
directory: path.resolve(__dirname, './locales'),
updateFiles: false
})
if (!cwd) cwd = process.cwd()
self.$0 = process.argv
.slice(0, 2)
.map(function (x, i) {
// ignore the node bin, specify this in your
// bin file with #!/usr/bin/env node
if (i === 0 && /\b(node|iojs)$/.test(x)) return
var b = rebase(cwd, x)
return x.match(/^\//) && 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) + '/', ''
)
}
var options
self.resetOptions = self.reset = function () {
// put yargs back into its initial
// state, this is useful for creating a
// nested CLI.
options = {
array: [],
boolean: [],
string: [],
narg: {},
key: {},
alias: {},
default: {},
defaultDescription: {},
choices: {},
requiresArg: [],
count: [],
normalize: [],
config: {},
envPrefix: undefined
}
usage = Usage(self, y18n) // handle usage output.
validation = Validation(self, usage, y18n) // handle arg validation.
completion = Completion(self, usage)
demanded = {}
groups = {}
exitProcess = true
strict = false
helpOpt = null
versionOpt = null
commandHandlers = {}
self.parsed = false
return self
}
self.resetOptions()
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.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) {
if (typeof msg === 'function') {
parseFn = msg
msg = null
}
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, fn) {
if (description !== false) {
usage.command(cmd, description)
}
if (fn) commandHandlers[cmd] = fn
return self
}
var commandHandlers = {}
self.getCommandHandlers = function () {
return commandHandlers
}
self.string = function (strings) {
options.string.push.apply(options.string, [].concat(strings))
return self
}
self.default = 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 {
// perhaps 'x' is already an alias in another list?
// if so we should append to x's list.
var aliases = null
Object.keys(options.alias).forEach(function (key) {
if (~options.alias[key].indexOf(x)) aliases = options.alias[key]
})
if (aliases) { // x was an alias itself.
aliases.push(y)
} else { // x is a new alias key.
options.alias[x] = (options.alias[x] || []).concat(y)
}
// wait! perhaps we've created two lists of aliases
// that reference each other?
if (options.alias[y]) {
Array.prototype.push.apply((options.alias[x] || aliases), options.alias[y])
delete options.alias[y]
}
}
return self
}
self.count = function (counts) {
options.count.push.apply(options.count, [].concat(counts))
return self
}
var demanded = {}
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 (typeof max !== 'number') {
msg = max
max = Infinity
}
if (typeof keys === 'number') {
if (!demanded._) demanded._ = { count: 0, msg: null, max: max }
demanded._.count = keys
demanded._.msg = msg
} else if (Array.isArray(keys)) {
keys.forEach(function (key) {
self.demand(key, msg)
})
} else {
if (typeof msg === 'string') {
demanded[keys] = { msg: msg }
} else if (msg === true || typeof msg === 'undefined') {
demanded[keys] = { msg: undefined }
}
}
return self
}
self.getDemanded = function () {
return demanded
}
self.requiresArg = function (requiresArgs) {
options.requiresArg.push.apply(options.requiresArg, [].concat(requiresArgs))
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.defaults = self.default
self.describe = function (key, desc) {
options.key[key] = true
usage.describe(key, desc)
return self
}
self.parse = function (args) {
return parseArgs(args)
}
self.option = self.options = function (key, opt) {
if (typeof key === 'object') {
Object.keys(key).forEach(function (k) {
self.options(k, key[k])
})
} else {
assert(typeof opt === 'object', 'second argument to option must be an object')
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 ('choices' in opt) {
self.choices(key, opt.choices)
} 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.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
}
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
}
var groups = {}
self.group = function (opts, groupName) {
var seen = {}
groups[groupName] = (groups[groupName] || []).concat(opts).filter(function (key) {
if (seen[key]) return false
return (seen[key] = true)
})
return self
}
self.getGroups = function () {
return groups
}
// 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 (ver, opt, msg) {
versionOpt = opt || 'version'
usage.version(ver)
self.boolean(versionOpt)
self.describe(versionOpt, msg || usage.deferY18nLookup('Show version number'))
return self
}
var helpOpt = null
self.addHelpOpt = function (opt, msg) {
helpOpt = opt
self.boolean(opt)
self.describe(opt, 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
}
self.help = function () {
if (arguments.length > 0) return self.addHelpOpt.apply(self, arguments)
if (!self.parsed) parseArgs(processArgs) // run parser, if it has not already been executed.
return usage.help()
}
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
console.log(completion.generateCompletionScript($0))
return self
}
self.locale = function (locale) {
if (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
}
self.getUsageInstance = function () {
return usage
}
self.getValidationInstance = function () {
return validation
}
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)
}
return args
},
enumerable: true
})
function parseArgs (args) {
args = normalizeArgs(args)
var parsed = Parser(args, options, y18n)
var argv = parsed.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.
if (completionCommand &&
(process.argv.join(' ')).indexOf(completion.completionKey) !== -1 &&
!argv[completion.completionKey]) {
return argv
}
// if there's a handler associated with a
// command defer processing to it.
var handlerKeys = Object.keys(self.getCommandHandlers())
for (var i = 0, command; (command = handlerKeys[i]) !== undefined; i++) {
if (~argv._.indexOf(command)) {
runCommand(command, self, argv)
return self.argv
}
}
// generate a completion script for adding to ~/.bashrc.
if (completionCommand && ~argv._.indexOf(completionCommand) && !argv[completion.completionKey]) {
self.showCompletionScript()
if (exitProcess) {
process.exit(0)
}
}
// we must run completions first, a user might
// want to complete the --help or --version option.
if (completion.completionKey in argv) {
// we allow for asynchronous completions,
// e.g., loading in a list of commands from an API.
completion.getCompletion(function (completions) {
;(completions || []).forEach(function (completion) {
console.log(completion)
})
if (exitProcess) {
process.exit(0)
}
})
return
}
var helpOrVersion = false
Object.keys(argv).forEach(function (key) {
if (key === helpOpt && argv[key]) {
helpOrVersion = true
self.showHelp('log')
if (exitProcess) {
process.exit(0)
}
} else if (key === versionOpt && argv[key]) {
helpOrVersion = true
usage.showVersion()
if (exitProcess) {
process.exit(0)
}
}
})
// If the help or version options where used and exitProcess is false,
// we won't run validations
if (!helpOrVersion) {
if (parsed.error) throw parsed.error
// if we're executed via bash completion, don't
// bother with validation.
if (!argv[completion.completionKey]) {
validation.nonOptionCount(argv)
validation.missingArgumentValue(argv)
validation.requiredArguments(argv)
if (strict) validation.unknownArguments(argv, aliases)
validation.customChecks(argv, aliases)
validation.limitedChoices(argv)
validation.implications(argv)
}
}
setPlaceholderKeys(argv)
return argv
}
function guessLocale () {
if (!detectLocale) return
try {
var 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 runCommand (command, yargs, argv) {
setPlaceholderKeys(argv)
yargs.getCommandHandlers()[command](yargs.reset(), argv)
}
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
})
}
function normalizeArgs (args) {
if (typeof args === 'string') {
return tokenizeArgString(args)
}
return args
}
singletonify(self)
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)
}
/* Hack an instance of Argv with process.argv into Argv
so people can do
require('yargs')(['--beeble=1','-z','zizzle']).argv
to parse a list of args and
require('yargs').argv
to get a parsed version of process.argv.
*/
function singletonify (inst) {
Object.keys(inst).forEach(function (key) {
if (key === 'argv') {
Argv.__defineGetter__(key, inst.__lookupGetter__(key))
} else {
Argv[key] = typeof inst[key] === 'function' ? inst[key].bind(inst) : inst[key]
}
})
}