877 lines
19 KiB
JavaScript
877 lines
19 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var EventEmitter = require('events').EventEmitter;
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var spawn = require('child_process').spawn;
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var path = require('path');
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var dirname = path.dirname;
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var basename = path.basename;
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/**
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* Expose the root command.
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*/
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exports = module.exports = new Command;
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/**
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* Expose `Command`.
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*/
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exports.Command = Command;
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/**
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* Expose `Option`.
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*/
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exports.Option = Option;
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/**
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* Initialize a new `Option` with the given `flags` and `description`.
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*
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* @param {String} flags
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* @param {String} description
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* @api public
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*/
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function Option(flags, description) {
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this.flags = flags;
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this.required = ~flags.indexOf('<');
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this.optional = ~flags.indexOf('[');
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this.bool = !~flags.indexOf('-no-');
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flags = flags.split(/[ ,|]+/);
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if (flags.length > 1 && !/^[[<]/.test(flags[1])) this.short = flags.shift();
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this.long = flags.shift();
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this.description = description || '';
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}
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/**
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* Return option name.
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*
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* @return {String}
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* @api private
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*/
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Option.prototype.name = function(){
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return this.long
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.replace('--', '')
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.replace('no-', '');
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};
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/**
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* Check if `arg` matches the short or long flag.
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*
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* @param {String} arg
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* @return {Boolean}
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* @api private
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*/
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Option.prototype.is = function(arg){
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return arg == this.short
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|| arg == this.long;
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};
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/**
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* Initialize a new `Command`.
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*
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* @param {String} name
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* @api public
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*/
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function Command(name) {
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this.commands = [];
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this.options = [];
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this._execs = [];
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this._args = [];
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this._name = name;
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}
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/**
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* Inherit from `EventEmitter.prototype`.
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*/
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Command.prototype.__proto__ = EventEmitter.prototype;
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/**
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* Add command `name`.
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*
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* The `.action()` callback is invoked when the
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* command `name` is specified via __ARGV__,
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* and the remaining arguments are applied to the
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* function for access.
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*
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* When the `name` is "*" an un-matched command
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* will be passed as the first arg, followed by
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* the rest of __ARGV__ remaining.
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*
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* Examples:
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*
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* program
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* .version('0.0.1')
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* .option('-C, --chdir <path>', 'change the working directory')
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* .option('-c, --config <path>', 'set config path. defaults to ./deploy.conf')
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* .option('-T, --no-tests', 'ignore test hook')
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*
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* program
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* .command('setup')
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* .description('run remote setup commands')
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* .action(function(){
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* console.log('setup');
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* });
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*
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* program
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* .command('exec <cmd>')
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* .description('run the given remote command')
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* .action(function(cmd){
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* console.log('exec "%s"', cmd);
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* });
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*
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* program
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* .command('*')
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* .description('deploy the given env')
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* .action(function(env){
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* console.log('deploying "%s"', env);
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* });
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*
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* program.parse(process.argv);
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*
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* @param {String} name
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* @param {String} [desc]
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* @return {Command} the new command
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* @api public
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*/
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Command.prototype.command = function(name, desc) {
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var args = name.split(/ +/);
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var cmd = new Command(args.shift());
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if (desc) cmd.description(desc);
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if (desc) this.executables = true;
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if (desc) this._execs[cmd._name] = true;
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this.commands.push(cmd);
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cmd.parseExpectedArgs(args);
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cmd.parent = this;
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if (desc) return this;
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return cmd;
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};
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/**
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* Add an implicit `help [cmd]` subcommand
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* which invokes `--help` for the given command.
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*
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* @api private
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*/
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Command.prototype.addImplicitHelpCommand = function() {
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this.command('help [cmd]', 'display help for [cmd]');
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};
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/**
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* Parse expected `args`.
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*
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* For example `["[type]"]` becomes `[{ required: false, name: 'type' }]`.
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*
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* @param {Array} args
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* @return {Command} for chaining
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* @api public
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*/
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Command.prototype.parseExpectedArgs = function(args){
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if (!args.length) return;
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var self = this;
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args.forEach(function(arg){
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switch (arg[0]) {
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case '<':
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self._args.push({ required: true, name: arg.slice(1, -1) });
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break;
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case '[':
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self._args.push({ required: false, name: arg.slice(1, -1) });
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break;
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}
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});
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return this;
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};
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/**
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* Register callback `fn` for the command.
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*
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* Examples:
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*
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* program
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* .command('help')
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* .description('display verbose help')
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* .action(function(){
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* // output help here
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* });
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*
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* @param {Function} fn
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* @return {Command} for chaining
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* @api public
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*/
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Command.prototype.action = function(fn){
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var self = this;
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var listener = function(args, unknown){
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// Parse any so-far unknown options
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args = args || [];
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unknown = unknown || [];
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var parsed = self.parseOptions(unknown);
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// Output help if necessary
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outputHelpIfNecessary(self, parsed.unknown);
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// If there are still any unknown options, then we simply
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// die, unless someone asked for help, in which case we give it
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// to them, and then we die.
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if (parsed.unknown.length > 0) {
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self.unknownOption(parsed.unknown[0]);
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}
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// Leftover arguments need to be pushed back. Fixes issue #56
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if (parsed.args.length) args = parsed.args.concat(args);
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self._args.forEach(function(arg, i){
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if (arg.required && null == args[i]) {
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self.missingArgument(arg.name);
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}
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});
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// Always append ourselves to the end of the arguments,
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// to make sure we match the number of arguments the user
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// expects
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if (self._args.length) {
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args[self._args.length] = self;
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} else {
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args.push(self);
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}
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fn.apply(this, args);
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};
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this.parent.on(this._name, listener);
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if (this._alias) this.parent.on(this._alias, listener);
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return this;
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};
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/**
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* Define option with `flags`, `description` and optional
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* coercion `fn`.
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*
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* The `flags` string should contain both the short and long flags,
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* separated by comma, a pipe or space. The following are all valid
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* all will output this way when `--help` is used.
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*
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* "-p, --pepper"
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* "-p|--pepper"
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* "-p --pepper"
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*
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* Examples:
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*
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* // simple boolean defaulting to false
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* program.option('-p, --pepper', 'add pepper');
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*
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* --pepper
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* program.pepper
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* // => Boolean
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*
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* // simple boolean defaulting to true
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* program.option('-C, --no-cheese', 'remove cheese');
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*
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* program.cheese
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* // => true
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*
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* --no-cheese
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* program.cheese
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* // => false
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*
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* // required argument
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* program.option('-C, --chdir <path>', 'change the working directory');
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*
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* --chdir /tmp
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* program.chdir
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* // => "/tmp"
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*
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* // optional argument
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* program.option('-c, --cheese [type]', 'add cheese [marble]');
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*
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* @param {String} flags
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* @param {String} description
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* @param {Function|Mixed} fn or default
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* @param {Mixed} defaultValue
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* @return {Command} for chaining
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* @api public
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*/
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Command.prototype.option = function(flags, description, fn, defaultValue){
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var self = this
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, option = new Option(flags, description)
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, oname = option.name()
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, name = camelcase(oname);
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// default as 3rd arg
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if ('function' != typeof fn) defaultValue = fn, fn = null;
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// preassign default value only for --no-*, [optional], or <required>
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if (false == option.bool || option.optional || option.required) {
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// when --no-* we make sure default is true
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if (false == option.bool) defaultValue = true;
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// preassign only if we have a default
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if (undefined !== defaultValue) self[name] = defaultValue;
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}
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// register the option
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this.options.push(option);
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// when it's passed assign the value
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// and conditionally invoke the callback
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this.on(oname, function(val){
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// coercion
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if (null !== val && fn) val = fn(val, undefined === self[name] ? defaultValue : self[name]);
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// unassigned or bool
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if ('boolean' == typeof self[name] || 'undefined' == typeof self[name]) {
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// if no value, bool true, and we have a default, then use it!
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if (null == val) {
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self[name] = option.bool
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? defaultValue || true
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: false;
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} else {
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self[name] = val;
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}
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} else if (null !== val) {
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// reassign
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self[name] = val;
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}
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});
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return this;
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};
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/**
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* Parse `argv`, settings options and invoking commands when defined.
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*
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* @param {Array} argv
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* @return {Command} for chaining
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* @api public
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*/
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Command.prototype.parse = function(argv){
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// implicit help
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if (this.executables) this.addImplicitHelpCommand();
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// store raw args
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this.rawArgs = argv;
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// guess name
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this._name = this._name || basename(argv[1], '.js');
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// process argv
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var parsed = this.parseOptions(this.normalize(argv.slice(2)));
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var args = this.args = parsed.args;
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var result = this.parseArgs(this.args, parsed.unknown);
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// executable sub-commands
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var name = result.args[0];
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if (this._execs[name]) return this.executeSubCommand(argv, args, parsed.unknown);
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return result;
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};
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/**
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* Execute a sub-command executable.
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*
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* @param {Array} argv
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* @param {Array} args
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* @param {Array} unknown
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* @api private
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*/
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Command.prototype.executeSubCommand = function(argv, args, unknown) {
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args = args.concat(unknown);
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if (!args.length) this.help();
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if ('help' == args[0] && 1 == args.length) this.help();
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// <cmd> --help
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if ('help' == args[0]) {
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args[0] = args[1];
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args[1] = '--help';
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}
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// executable
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var dir = dirname(argv[1]);
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var bin = basename(argv[1], '.js') + '-' + args[0];
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// check for ./<bin> first
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var local = path.join(dir, bin);
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// run it
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args = args.slice(1);
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args.unshift(local);
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var proc = spawn('node', args, { stdio: 'inherit', customFds: [0, 1, 2] });
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proc.on('error', function(err){
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if (err.code == "ENOENT") {
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console.error('\n %s(1) does not exist, try --help\n', bin);
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} else if (err.code == "EACCES") {
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console.error('\n %s(1) not executable. try chmod or run with root\n', bin);
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}
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});
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this.runningCommand = proc;
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};
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/**
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* Normalize `args`, splitting joined short flags. For example
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* the arg "-abc" is equivalent to "-a -b -c".
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* This also normalizes equal sign and splits "--abc=def" into "--abc def".
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*
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* @param {Array} args
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* @return {Array}
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* @api private
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*/
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Command.prototype.normalize = function(args){
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var ret = []
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, arg
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, lastOpt
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, index;
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for (var i = 0, len = args.length; i < len; ++i) {
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arg = args[i];
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i > 0 && (lastOpt = this.optionFor(args[i-1]));
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if (lastOpt && lastOpt.required) {
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ret.push(arg);
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} else if (arg.length > 1 && '-' == arg[0] && '-' != arg[1]) {
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arg.slice(1).split('').forEach(function(c){
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ret.push('-' + c);
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});
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} else if (/^--/.test(arg) && ~(index = arg.indexOf('='))) {
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ret.push(arg.slice(0, index), arg.slice(index + 1));
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} else {
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ret.push(arg);
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}
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}
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return ret;
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};
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/**
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* Parse command `args`.
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*
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* When listener(s) are available those
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* callbacks are invoked, otherwise the "*"
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* event is emitted and those actions are invoked.
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*
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* @param {Array} args
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* @return {Command} for chaining
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* @api private
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*/
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Command.prototype.parseArgs = function(args, unknown){
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var cmds = this.commands
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, len = cmds.length
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, name;
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if (args.length) {
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name = args[0];
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if (this.listeners(name).length) {
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this.emit(args.shift(), args, unknown);
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} else {
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this.emit('*', args);
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}
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} else {
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outputHelpIfNecessary(this, unknown);
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// If there were no args and we have unknown options,
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// then they are extraneous and we need to error.
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if (unknown.length > 0) {
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this.unknownOption(unknown[0]);
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}
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}
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return this;
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};
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/**
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* Return an option matching `arg` if any.
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*
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* @param {String} arg
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* @return {Option}
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* @api private
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*/
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Command.prototype.optionFor = function(arg){
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for (var i = 0, len = this.options.length; i < len; ++i) {
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if (this.options[i].is(arg)) {
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return this.options[i];
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}
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}
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};
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/**
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* Parse options from `argv` returning `argv`
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* void of these options.
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*
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* @param {Array} argv
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* @return {Array}
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* @api public
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*/
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Command.prototype.parseOptions = function(argv){
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var args = []
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, len = argv.length
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, literal
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, option
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, arg;
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var unknownOptions = [];
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// parse options
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for (var i = 0; i < len; ++i) {
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arg = argv[i];
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// literal args after --
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if ('--' == arg) {
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literal = true;
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continue;
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}
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if (literal) {
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args.push(arg);
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continue;
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}
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// find matching Option
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option = this.optionFor(arg);
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// option is defined
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if (option) {
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// requires arg
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if (option.required) {
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arg = argv[++i];
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if (null == arg) return this.optionMissingArgument(option);
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this.emit(option.name(), arg);
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// optional arg
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} else if (option.optional) {
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arg = argv[i+1];
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if (null == arg || ('-' == arg[0] && '-' != arg)) {
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arg = null;
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} else {
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++i;
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}
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this.emit(option.name(), arg);
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// bool
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} else {
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this.emit(option.name());
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}
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continue;
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}
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// looks like an option
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if (arg.length > 1 && '-' == arg[0]) {
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unknownOptions.push(arg);
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// If the next argument looks like it might be
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// an argument for this option, we pass it on.
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// If it isn't, then it'll simply be ignored
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if (argv[i+1] && '-' != argv[i+1][0]) {
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unknownOptions.push(argv[++i]);
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}
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continue;
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}
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// arg
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args.push(arg);
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}
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return { args: args, unknown: unknownOptions };
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};
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/**
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* Argument `name` is missing.
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*
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* @param {String} name
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* @api private
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*/
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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){
|
|
console.error();
|
|
console.error(" error: unknown option `%s'", flag);
|
|
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 (0 == arguments.length) return this._version;
|
|
this._version = str;
|
|
flags = flags || '-V, --version';
|
|
this.option(flags, 'output the version number');
|
|
this.on('version', function(){
|
|
console.log(str);
|
|
process.exit(0);
|
|
});
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Set the description `str`.
|
|
*
|
|
* @param {String} str
|
|
* @return {String|Command}
|
|
* @api public
|
|
*/
|
|
|
|
Command.prototype.description = function(str){
|
|
if (0 == arguments.length) return this._description;
|
|
this._description = str;
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Set an alias for the command
|
|
*
|
|
* @param {String} alias
|
|
* @return {String|Command}
|
|
* @api public
|
|
*/
|
|
|
|
Command.prototype.alias = function(alias){
|
|
if (0 == arguments.length) return this._alias;
|
|
this._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 arg.required
|
|
? '<' + arg.name + '>'
|
|
: '[' + arg.name + ']';
|
|
});
|
|
|
|
var usage = '[options'
|
|
+ (this.commands.length ? '] [command' : '')
|
|
+ ']'
|
|
+ (this._args.length ? ' ' + args : '');
|
|
|
|
if (0 == arguments.length) return this._usage || usage;
|
|
this._usage = str;
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Return the largest option length.
|
|
*
|
|
* @return {Number}
|
|
* @api private
|
|
*/
|
|
|
|
Command.prototype.largestOptionLength = function(){
|
|
return this.options.reduce(function(max, option){
|
|
return Math.max(max, option.flags.length);
|
|
}, 0);
|
|
};
|
|
|
|
/**
|
|
* Return help for options.
|
|
*
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
Command.prototype.optionHelp = function(){
|
|
var width = this.largestOptionLength();
|
|
|
|
// Prepend the help information
|
|
return [pad('-h, --help', width) + ' ' + 'output usage information']
|
|
.concat(this.options.map(function(option){
|
|
return pad(option.flags, width)
|
|
+ ' ' + option.description;
|
|
}))
|
|
.join('\n');
|
|
};
|
|
|
|
/**
|
|
* Return command help documentation.
|
|
*
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
Command.prototype.commandHelp = function(){
|
|
if (!this.commands.length) return '';
|
|
return [
|
|
''
|
|
, ' Commands:'
|
|
, ''
|
|
, this.commands.map(function(cmd){
|
|
var args = cmd._args.map(function(arg){
|
|
return arg.required
|
|
? '<' + arg.name + '>'
|
|
: '[' + arg.name + ']';
|
|
}).join(' ');
|
|
|
|
return cmd._name
|
|
+ (cmd._alias
|
|
? '|' + cmd._alias
|
|
: '')
|
|
+ (cmd.options.length
|
|
? ' [options]'
|
|
: '') + ' ' + args
|
|
+ (cmd.description()
|
|
? '\n ' + cmd.description()
|
|
: '')
|
|
+ '\n';
|
|
}).join('\n').replace(/^/gm, ' ')
|
|
, ''
|
|
].join('\n');
|
|
};
|
|
|
|
/**
|
|
* Return program help documentation.
|
|
*
|
|
* @return {String}
|
|
* @api private
|
|
*/
|
|
|
|
Command.prototype.helpInformation = function(){
|
|
return [
|
|
''
|
|
, ' Usage: ' + this._name
|
|
+ (this._alias
|
|
? '|' + this._alias
|
|
: '')
|
|
+ ' ' + this.usage()
|
|
, '' + this.commandHelp()
|
|
, ' Options:'
|
|
, ''
|
|
, '' + this.optionHelp().replace(/^/gm, ' ')
|
|
, ''
|
|
, ''
|
|
].join('\n');
|
|
};
|
|
|
|
/**
|
|
* Output help information for this command
|
|
*
|
|
* @api public
|
|
*/
|
|
|
|
Command.prototype.outputHelp = function(){
|
|
process.stdout.write(this.helpInformation());
|
|
this.emit('--help');
|
|
};
|
|
|
|
/**
|
|
* Output help information and exit.
|
|
*
|
|
* @api public
|
|
*/
|
|
|
|
Command.prototype.help = function(){
|
|
this.outputHelp();
|
|
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);
|
|
}
|
|
}
|
|
}
|