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/**
* Module dependencies.
*/
var EventEmitter = require('events').EventEmitter;
var spawn = require('child_process').spawn;
var path = require('path');
var dirname = path.dirname;
var basename = path.basename;
var fs = require('fs');
/**
* Inherit `Command` from `EventEmitter.prototype`.
*/
require('util').inherits(Command, EventEmitter);
/**
* Expose the root command.
*/
exports = module.exports = new Command();
/**
* Expose `Command`.
*/
exports.Command = Command;
/**
* Expose `Option`.
*/
exports.Option = Option;
/**
* Initialize a new `Option` with the given `flags` and `description`.
*
* @param {String} flags
* @param {String} description
* @api public
*/
function Option(flags, description) {
this.flags = flags;
this.required = flags.indexOf('<') >= 0;
this.optional = flags.indexOf('[') >= 0;
this.bool = flags.indexOf('-no-') === -1;
flags = flags.split(/[ ,|]+/);
if (flags.length > 1 && !/^[[<]/.test(flags[1])) this.short = flags.shift();
this.long = flags.shift();
this.description = description || '';
}
/**
* Return option name.
*
* @return {String}
* @api private
*/
Option.prototype.name = function() {
return this.long
.replace('--', '')
.replace('no-', '');
};
/**
* Return option name, in a camelcase format that can be used
* as a object attribute key.
*
* @return {String}
* @api private
*/
Option.prototype.attributeName = function() {
return camelcase(this.name());
};
/**
* Check if `arg` matches the short or long flag.
*
* @param {String} arg
* @return {Boolean}
* @api private
*/
Option.prototype.is = function(arg) {
return this.short === arg || this.long === arg;
};
/**
* Initialize a new `Command`.
*
* @param {String} name
* @api public
*/
function Command(name) {
this.commands = [];
this.options = [];
this._execs = {};
this._allowUnknownOption = false;
this._args = [];
this._name = name || '';
}
/**
* Add command `name`.
*
* The `.action()` callback is invoked when the
* command `name` is specified via __ARGV__,
* and the remaining arguments are applied to the
* function for access.
*
* When the `name` is "*" an un-matched command
* will be passed as the first arg, followed by
* the rest of __ARGV__ remaining.
*
* Examples:
*
* program
* .version('0.0.1')
* .option('-C, --chdir <path>', 'change the working directory')
* .option('-c, --config <path>', 'set config path. defaults to ./deploy.conf')
* .option('-T, --no-tests', 'ignore test hook')
*
* program
* .command('setup')
* .description('run remote setup commands')
* .action(function() {
* console.log('setup');
* });
*
* program
* .command('exec <cmd>')
* .description('run the given remote command')
* .action(function(cmd) {
* console.log('exec "%s"', cmd);
* });
*
* program
* .command('teardown <dir> [otherDirs...]')
* .description('run teardown commands')
* .action(function(dir, otherDirs) {
* console.log('dir "%s"', dir);
* if (otherDirs) {
* otherDirs.forEach(function (oDir) {
* console.log('dir "%s"', oDir);
* });
* }
* });
*
* program
* .command('*')
* .description('deploy the given env')
* .action(function(env) {
* console.log('deploying "%s"', env);
* });
*
* program.parse(process.argv);
*
* @param {String} name
* @param {String} [desc] for git-style sub-commands
* @return {Command} the new command
* @api public
*/
Command.prototype.command = function(name, desc, opts) {
if (typeof desc === 'object' && desc !== null) {
opts = desc;
desc = null;
}
opts = opts || {};
var args = name.split(/ +/);
var cmd = new Command(args.shift());
if (desc) {
cmd.description(desc);
this.executables = true;
this._execs[cmd._name] = true;
if (opts.isDefault) this.defaultExecutable = cmd._name;
}
cmd._noHelp = !!opts.noHelp;
this.commands.push(cmd);
cmd.parseExpectedArgs(args);
cmd.parent = this;
if (desc) return this;
return cmd;
};
/**
* Define argument syntax for the top-level command.
*
* @api public
*/
Command.prototype.arguments = function(desc) {
return this.parseExpectedArgs(desc.split(/ +/));
};
/**
* Add an implicit `help [cmd]` subcommand
* which invokes `--help` for the given command.
*
* @api private
*/
Command.prototype.addImplicitHelpCommand = function() {
this.command('help [cmd]', 'display help for [cmd]');
};
/**
* Parse expected `args`.
*
* For example `["[type]"]` becomes `[{ required: false, name: 'type' }]`.
*
* @param {Array} args
* @return {Command} for chaining
* @api public
*/
Command.prototype.parseExpectedArgs = function(args) {
if (!args.length) return;
var self = this;
args.forEach(function(arg) {
var argDetails = {
required: false,
name: '',
variadic: false
};
switch (arg[0]) {
case '<':
argDetails.required = true;
argDetails.name = arg.slice(1, -1);
break;
case '[':
argDetails.name = arg.slice(1, -1);
break;
}
if (argDetails.name.length > 3 && argDetails.name.slice(-3) === '...') {
argDetails.variadic = true;
argDetails.name = argDetails.name.slice(0, -3);
}
if (argDetails.name) {
self._args.push(argDetails);
}
});
return this;
};
/**
* Register callback `fn` for the command.
*
* Examples:
*
* program
* .command('help')
* .description('display verbose help')
* .action(function() {
* // output help here
* });
*
* @param {Function} fn
* @return {Command} for chaining
* @api public
*/
Command.prototype.action = function(fn) {
var self = this;
var listener = function(args, unknown) {
// Parse any so-far unknown options
args = args || [];
unknown = unknown || [];
var parsed = self.parseOptions(unknown);
// Output help if necessary
outputHelpIfNecessary(self, parsed.unknown);
// If there are still any unknown options, then we simply
// die, unless someone asked for help, in which case we give it
// to them, and then we die.
if (parsed.unknown.length > 0) {
self.unknownOption(parsed.unknown[0]);
}
// Leftover arguments need to be pushed back. Fixes issue #56
if (parsed.args.length) args = parsed.args.concat(args);
self._args.forEach(function(arg, i) {
if (arg.required && args[i] == null) {
self.missingArgument(arg.name);
} else if (arg.variadic) {
if (i !== self._args.length - 1) {
self.variadicArgNotLast(arg.name);
}
args[i] = args.splice(i);
}
});
// Always append ourselves to the end of the arguments,
// to make sure we match the number of arguments the user
// expects
if (self._args.length) {
args[self._args.length] = self;
} else {
args.push(self);
}
fn.apply(self, args);
};
var parent = this.parent || this;
var name = parent === this ? '*' : this._name;
parent.on('command:' + name, listener);
if (this._alias) parent.on('command:' + this._alias, listener);
return this;
};
/**
* Define option with `flags`, `description` and optional
* coercion `fn`.
*
* The `flags` string should contain both the short and long flags,
* separated by comma, a pipe or space. The following are all valid
* all will output this way when `--help` is used.
*
* "-p, --pepper"
* "-p|--pepper"
* "-p --pepper"
*
* Examples:
*
* // simple boolean defaulting to false
* program.option('-p, --pepper', 'add pepper');
*
* --pepper
* program.pepper
* // => Boolean
*
* // simple boolean defaulting to true
* program.option('-C, --no-cheese', 'remove cheese');
*
* program.cheese
* // => true
*
* --no-cheese
* program.cheese
* // => false
*
* // required argument
* program.option('-C, --chdir <path>', 'change the working directory');
*
* --chdir /tmp
* program.chdir
* // => "/tmp"
*
* // optional argument
* program.option('-c, --cheese [type]', 'add cheese [marble]');
*
* @param {String} flags
* @param {String} description
* @param {Function|*} [fn] or default
* @param {*} [defaultValue]
* @return {Command} for chaining
* @api public
*/
Command.prototype.option = function(flags, description, fn, defaultValue) {
var self = this,
option = new Option(flags, description),
oname = option.name(),
name = option.attributeName();
// default as 3rd arg
if (typeof fn !== 'function') {
if (fn instanceof RegExp) {
var regex = fn;
fn = function(val, def) {
var m = regex.exec(val);
return m ? m[0] : def;
};
} else {
defaultValue = fn;
fn = null;
}
}
// preassign default value only for --no-*, [optional], or <required>
if (!option.bool || option.optional || option.required) {
// when --no-* we make sure default is true
if (!option.bool) defaultValue = true;
// preassign only if we have a default
if (defaultValue !== undefined) {
self[name] = defaultValue;
option.defaultValue = defaultValue;
}
}
// register the option
this.options.push(option);
// when it's passed assign the value
// and conditionally invoke the callback
this.on('option:' + oname, function(val) {
// coercion
if (val !== null && fn) {
val = fn(val, self[name] === undefined ? defaultValue : self[name]);
}
// unassigned or bool
if (typeof self[name] === 'boolean' || typeof self[name] === 'undefined') {
// if no value, bool true, and we have a default, then use it!
if (val == null) {
self[name] = option.bool
? defaultValue || true
: false;
} else {
self[name] = val;
}
} else if (val !== null) {
// reassign
self[name] = val;
}
});
return this;
};
/**
* Allow unknown options on the command line.
*
* @param {Boolean} arg if `true` or omitted, no error will be thrown
* for unknown options.
* @api public
*/
Command.prototype.allowUnknownOption = function(arg) {
this._allowUnknownOption = arguments.length === 0 || arg;
return this;
};
/**
* Parse `argv`, settings options and invoking commands when defined.
*
* @param {Array} argv
* @return {Command} for chaining
* @api public
*/
Command.prototype.parse = function(argv) {
// implicit help
if (this.executables) this.addImplicitHelpCommand();
// store raw args
this.rawArgs = argv;
// guess name
this._name = this._name || basename(argv[1], '.js');
// github-style sub-commands with no sub-command
if (this.executables && argv.length < 3 && !this.defaultExecutable) {
// this user needs help
argv.push('--help');
}
// process argv
var parsed = this.parseOptions(this.normalize(argv.slice(2)));
var args = this.args = parsed.args;
var result = this.parseArgs(this.args, parsed.unknown);
// executable sub-commands
var name = result.args[0];
var aliasCommand = null;
// check alias of sub commands
if (name) {
aliasCommand = this.commands.filter(function(command) {
return command.alias() === name;
})[0];
}
if (this._execs[name] && typeof this._execs[name] !== 'function') {
return this.executeSubCommand(argv, args, parsed.unknown);
} else if (aliasCommand) {
// is alias of a subCommand
args[0] = aliasCommand._name;
return this.executeSubCommand(argv, args, parsed.unknown);
} else if (this.defaultExecutable) {
// use the default subcommand
args.unshift(this.defaultExecutable);
return this.executeSubCommand(argv, args, parsed.unknown);
}
return result;
};
/**
* Execute a sub-command executable.
*
* @param {Array} argv
* @param {Array} args
* @param {Array} unknown
* @api private
*/
Command.prototype.executeSubCommand = function(argv, args, unknown) {
args = args.concat(unknown);
if (!args.length) this.help();
if (args[0] === 'help' && args.length === 1) this.help();
// <cmd> --help
if (args[0] === 'help') {
args[0] = args[1];
args[1] = '--help';
}
// executable
var f = argv[1];
// name of the subcommand, link `pm-install`
var bin = basename(f, path.extname(f)) + '-' + args[0];
// In case of globally installed, get the base dir where executable
// subcommand file should be located at
var baseDir;
var resolvedLink = fs.realpathSync(f);
baseDir = dirname(resolvedLink);
// prefer local `./<bin>` to bin in the $PATH
var localBin = path.join(baseDir, bin);
// whether bin file is a js script with explicit `.js` or `.ts` extension
var isExplicitJS = false;
if (exists(localBin + '.js')) {
bin = localBin + '.js';
isExplicitJS = true;
} else if (exists(localBin + '.ts')) {
bin = localBin + '.ts';
isExplicitJS = true;
} else if (exists(localBin)) {
bin = localBin;
}
args = args.slice(1);
var proc;
if (process.platform !== 'win32') {
if (isExplicitJS) {
args.unshift(bin);
// add executable arguments to spawn
args = (process.execArgv || []).concat(args);
proc = spawn(process.argv[0], args, { stdio: 'inherit', customFds: [0, 1, 2] });
} else {
proc = spawn(bin, args, { stdio: 'inherit', customFds: [0, 1, 2] });
}
} else {
args.unshift(bin);
proc = spawn(process.execPath, args, { stdio: 'inherit' });
}
var signals = ['SIGUSR1', 'SIGUSR2', 'SIGTERM', 'SIGINT', 'SIGHUP'];
signals.forEach(function(signal) {
process.on(signal, function() {
if (proc.killed === false && proc.exitCode === null) {
proc.kill(signal);
}
});
});
proc.on('close', process.exit.bind(process));
proc.on('error', function(err) {
if (err.code === 'ENOENT') {
console.error('error: %s(1) does not exist, try --help', bin);
} else if (err.code === 'EACCES') {
console.error('error: %s(1) not executable. try chmod or run with root', bin);
}
process.exit(1);
});
// Store the reference to the child process
this.runningCommand = proc;
};
/**
* Normalize `args`, splitting joined short flags. For example
* the arg "-abc" is equivalent to "-a -b -c".
* This also normalizes equal sign and splits "--abc=def" into "--abc def".
*
* @param {Array} args
* @return {Array}
* @api private
*/
Command.prototype.normalize = function(args) {
var ret = [],
arg,
lastOpt,
index;
for (var i = 0, len = args.length; i < len; ++i) {
arg = args[i];
if (i > 0) {
lastOpt = this.optionFor(args[i - 1]);
}
if (arg === '--') {
// Honor option terminator
ret = ret.concat(args.slice(i));
break;
} else if (lastOpt && lastOpt.required) {
ret.push(arg);
} else if (arg.length > 1 && arg[0] === '-' && arg[1] !== '-') {
arg.slice(1).split('').forEach(function(c) {
ret.push('-' + c);
});
} else if (/^--/.test(arg) && ~(index = arg.indexOf('='))) {
ret.push(arg.slice(0, index), arg.slice(index + 1));
} else {
ret.push(arg);
}
}
return ret;
};
/**
* Parse command `args`.
*
* When listener(s) are available those
* callbacks are invoked, otherwise the "*"
* event is emitted and those actions are invoked.
*
* @param {Array} args
* @return {Command} for chaining
* @api private
*/
Command.prototype.parseArgs = function(args, unknown) {
var name;
if (args.length) {
name = args[0];
if (this.listeners('command:' + name).length) {
this.emit('command:' + args.shift(), args, unknown);
} else {
this.emit('command:*', args);
}
} else {
outputHelpIfNecessary(this, unknown);
// If there were no args and we have unknown options,
// then they are extraneous and we need to error.
if (unknown.length > 0) {
this.unknownOption(unknown[0]);
}
if (this.commands.length === 0 &&
this._args.filter(function(a) { return a.required; }).length === 0) {
this.emit('command:*');
}
}
return this;
};
/**
* Return an option matching `arg` if any.
*
* @param {String} arg
* @return {Option}
* @api private
*/
Command.prototype.optionFor = function(arg) {
for (var i = 0, len = this.options.length; i < len; ++i) {
if (this.options[i].is(arg)) {
return this.options[i];
}
}
};
/**
* Parse options from `argv` returning `argv`
* void of these options.
*
* @param {Array} argv
* @return {Array}
* @api public
*/
Command.prototype.parseOptions = function(argv) {
var args = [],
len = argv.length,
literal,
option,
arg;
var unknownOptions = [];
// parse options
for (var i = 0; i < len; ++i) {
arg = argv[i];
// literal args after --
if (literal) {
args.push(arg);
continue;
}
if (arg === '--') {
literal = true;
continue;
}
// find matching Option
option = this.optionFor(arg);
// option is defined
if (option) {
// requires arg
if (option.required) {
arg = argv[++i];
if (arg == null) return this.optionMissingArgument(option);
this.emit('option:' + option.name(), arg);
// optional arg
} else if (option.optional) {
arg = argv[i + 1];
if (arg == null || (arg[0] === '-' && arg !== '-')) {
arg = null;
} else {
++i;
}
this.emit('option:' + option.name(), arg);
// bool
} else {
this.emit('option:' + option.name());
}
continue;
}
// looks like an option
if (arg.length > 1 && arg[0] === '-') {
unknownOptions.push(arg);
// If the next argument looks like it might be
// an argument for this option, we pass it on.
// If it isn't, then it'll simply be ignored
if ((i + 1) < argv.length && argv[i + 1][0] !== '-') {
unknownOptions.push(argv[++i]);
}
continue;
}
// arg
args.push(arg);
}
return { args: args, unknown: unknownOptions };
};
/**
* Return an object containing options as key-value pairs
*
* @return {Object}
* @api public
*/
Command.prototype.opts = function() {
var result = {},
len = this.options.length;
for (var i = 0; i < len; i++) {
var key = this.options[i].attributeName();
result[key] = key === this._versionOptionName ? this._version : this[key];
}
return result;
};
/**
* Argument `name` is missing.
*
* @param {String} name
* @api private
*/
Command.prototype.missingArgument = function(name) {
console.error("error: missing required argument `%s'", name);
process.exit(1);
};
/**
* `Option` is missing an argument, but received `flag` or nothing.
*
* @param {String} option
* @param {String} flag
* @api private
*/
Command.prototype.optionMissingArgument = function(option, flag) {
if (flag) {
console.error("error: option `%s' argument missing, got `%s'", option.flags, flag);
} else {
console.error("error: option `%s' argument missing", option.flags);
}
process.exit(1);
};
/**
* Unknown option `flag`.
*
* @param {String} flag
* @api private
*/
Command.prototype.unknownOption = function(flag) {
if (this._allowUnknownOption) return;
console.error("error: unknown option `%s'", flag);
process.exit(1);
};
/**
* Variadic argument with `name` is not the last argument as required.
*
* @param {String} name
* @api private
*/
Command.prototype.variadicArgNotLast = function(name) {
console.error("error: variadic arguments must be last `%s'", name);
process.exit(1);
};
/**
* Set the program version to `str`.
*
* This method auto-registers the "-V, --version" flag
* which will print the version number when passed.
*
* @param {String} str
* @param {String} [flags]
* @return {Command} for chaining
* @api public
*/
Command.prototype.version = function(str, flags) {
if (arguments.length === 0) return this._version;
this._version = str;
flags = flags || '-V, --version';
var versionOption = new Option(flags, 'output the version number');
this._versionOptionName = versionOption.long.substr(2) || 'version';
this.options.push(versionOption);
this.on('option:' + this._versionOptionName, function() {
process.stdout.write(str + '\n');
process.exit(0);
});
return this;
};
/**
* Set the description to `str`.
*
* @param {String} str
* @param {Object} argsDescription
* @return {String|Command}
* @api public
*/
Command.prototype.description = function(str, argsDescription) {
if (arguments.length === 0) return this._description;
this._description = str;
this._argsDescription = argsDescription;
return this;
};
/**
* Set an alias for the command
*
* @param {String} alias
* @return {String|Command}
* @api public
*/
Command.prototype.alias = function(alias) {
var command = this;
if (this.commands.length !== 0) {
command = this.commands[this.commands.length - 1];
}
if (arguments.length === 0) return command._alias;
if (alias === command._name) throw new Error('Command alias can\'t be the same as its name');
command._alias = alias;
return this;
};
/**
* Set / get the command usage `str`.
*
* @param {String} str
* @return {String|Command}
* @api public
*/
Command.prototype.usage = function(str) {
var args = this._args.map(function(arg) {
return humanReadableArgName(arg);
});
var usage = '[options]' +
(this.commands.length ? ' [command]' : '') +
(this._args.length ? ' ' + args.join(' ') : '');
if (arguments.length === 0) return this._usage || usage;
this._usage = str;
return this;
};
/**
* Get or set the name of the command
*
* @param {String} str
* @return {String|Command}
* @api public
*/
Command.prototype.name = function(str) {
if (arguments.length === 0) return this._name;
this._name = str;
return this;
};
/**
* Return prepared commands.
*
* @return {Array}
* @api private
*/
Command.prototype.prepareCommands = function() {
return this.commands.filter(function(cmd) {
return !cmd._noHelp;
}).map(function(cmd) {
var args = cmd._args.map(function(arg) {
return humanReadableArgName(arg);
}).join(' ');
return [
cmd._name +
(cmd._alias ? '|' + cmd._alias : '') +
(cmd.options.length ? ' [options]' : '') +
(args ? ' ' + args : ''),
cmd._description
];
});
};
/**
* Return the largest command length.
*
* @return {Number}
* @api private
*/
Command.prototype.largestCommandLength = function() {
var commands = this.prepareCommands();
return commands.reduce(function(max, command) {
return Math.max(max, command[0].length);
}, 0);
};
/**
* Return the largest option length.
*
* @return {Number}
* @api private
*/
Command.prototype.largestOptionLength = function() {
var options = [].slice.call(this.options);
options.push({
flags: '-h, --help'
});
return options.reduce(function(max, option) {
return Math.max(max, option.flags.length);
}, 0);
};
/**
* Return the largest arg length.
*
* @return {Number}
* @api private
*/
Command.prototype.largestArgLength = function() {
return this._args.reduce(function(max, arg) {
return Math.max(max, arg.name.length);
}, 0);
};
/**
* Return the pad width.
*
* @return {Number}
* @api private
*/
Command.prototype.padWidth = function() {
var width = this.largestOptionLength();
if (this._argsDescription && this._args.length) {
if (this.largestArgLength() > width) {
width = this.largestArgLength();
}
}
if (this.commands && this.commands.length) {
if (this.largestCommandLength() > width) {
width = this.largestCommandLength();
}
}
return width;
};
/**
* Return help for options.
*
* @return {String}
* @api private
*/
Command.prototype.optionHelp = function() {
var width = this.padWidth();
// Append the help information
return this.options.map(function(option) {
return pad(option.flags, width) + ' ' + option.description +
((option.bool && option.defaultValue !== undefined) ? ' (default: ' + JSON.stringify(option.defaultValue) + ')' : '');
}).concat([pad('-h, --help', width) + ' ' + 'output usage information'])
.join('\n');
};
/**
* Return command help documentation.
*
* @return {String}
* @api private
*/
Command.prototype.commandHelp = function() {
if (!this.commands.length) return '';
var commands = this.prepareCommands();
var width = this.padWidth();
return [
'Commands:',
commands.map(function(cmd) {
var desc = cmd[1] ? ' ' + cmd[1] : '';
return (desc ? pad(cmd[0], width) : cmd[0]) + desc;
}).join('\n').replace(/^/gm, ' '),
''
].join('\n');
};
/**
* Return program help documentation.
*
* @return {String}
* @api private
*/
Command.prototype.helpInformation = function() {
var desc = [];
if (this._description) {
desc = [
this._description,
''
];
var argsDescription = this._argsDescription;
if (argsDescription && this._args.length) {
var width = this.padWidth();
desc.push('Arguments:');
desc.push('');
this._args.forEach(function(arg) {
desc.push(' ' + pad(arg.name, width) + ' ' + argsDescription[arg.name]);
});
desc.push('');
}
}
var cmdName = this._name;
if (this._alias) {
cmdName = cmdName + '|' + this._alias;
}
var usage = [
'Usage: ' + cmdName + ' ' + this.usage(),
''
];
var cmds = [];
var commandHelp = this.commandHelp();
if (commandHelp) cmds = [commandHelp];
var options = [
'Options:',
'' + this.optionHelp().replace(/^/gm, ' '),
''
];
return usage
.concat(desc)
.concat(options)
.concat(cmds)
.join('\n');
};
/**
* Output help information for this command
*
* @api public
*/
Command.prototype.outputHelp = function(cb) {
if (!cb) {
cb = function(passthru) {
return passthru;
};
}
process.stdout.write(cb(this.helpInformation()));
this.emit('--help');
};
/**
* Output help information and exit.
*
* @api public
*/
Command.prototype.help = function(cb) {
this.outputHelp(cb);
process.exit();
};
/**
* Camel-case the given `flag`
*
* @param {String} flag
* @return {String}
* @api private
*/
function camelcase(flag) {
return flag.split('-').reduce(function(str, word) {
return str + word[0].toUpperCase() + word.slice(1);
});
}
/**
* Pad `str` to `width`.
*
* @param {String} str
* @param {Number} width
* @return {String}
* @api private
*/
function pad(str, width) {
var len = Math.max(0, width - str.length);
return str + Array(len + 1).join(' ');
}
/**
* Output help information if necessary
*
* @param {Command} command to output help for
* @param {Array} array of options to search for -h or --help
* @api private
*/
function outputHelpIfNecessary(cmd, options) {
options = options || [];
for (var i = 0; i < options.length; i++) {
if (options[i] === '--help' || options[i] === '-h') {
cmd.outputHelp();
process.exit(0);
}
}
}
/**
* Takes an argument an returns its human readable equivalent for help usage.
*
* @param {Object} arg
* @return {String}
* @api private
*/
function humanReadableArgName(arg) {
var nameOutput = arg.name + (arg.variadic === true ? '...' : '');
return arg.required
? '<' + nameOutput + '>'
: '[' + nameOutput + ']';
}
// for versions before node v0.8 when there weren't `fs.existsSync`
function exists(file) {
try {
if (fs.statSync(file).isFile()) {
return true;
}
} catch (e) {
return false;
}
}