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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, '.js') + '-' + args[0]; // In case of globally installed, get the base dir where executable // subcommand file should be located at var baseDir, link = fs.lstatSync(f).isSymbolicLink() ? fs.readlinkSync(f) : f; // when symbolink is relative path if (link !== f && link.charAt(0) !== '/') { link = path.join(dirname(f), link); } baseDir = dirname(link); // prefer local `./<bin>` to bin in the $PATH var localBin = path.join(baseDir, bin); // whether bin file is a js script with explicit `.js` extension var isExplicitJS = false; if (exists(localBin + '.js')) { bin = localBin + '.js'; 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('\n %s(1) does not exist, try --help\n', bin); } else if (err.code === 'EACCES') { console.error('\n %s(1) not executable. try chmod or run with root\n', 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(); console.error(" error: missing required argument `%s'", name); console.error(); 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) { console.error(); if (flag) { console.error(" error: option `%s' argument missing, got `%s'", option.flags, flag); } else { console.error(" error: option `%s' argument missing", option.flags); } console.error(); process.exit(1); }; /** * Unknown option `flag`. * * @param {String} flag * @api private */ Command.prototype.unknownOption = function(flag) { if (this._allowUnknownOption) return; console.error(); console.error(" error: unknown option `%s'", flag); console.error(); 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(); console.error(" error: variadic arguments must be last `%s'", name); console.error(); 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: ' + 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) .concat(['']) .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; } }