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 <a href="../../index.html">All files</a> / <a href="index.html">coa/lib</a> cmd.js
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 <div class='clearfix'>
 <div class='fl pad1y space-right2'>
 81.22% 
 Statements
 147/181
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 <div class='fl pad1y space-right2'>
 71.64% 
 Branches
 96/134
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 68.75% 
 Functions
 33/48
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 <div class='fl pad1y space-right2'>
 82.53% 
 Lines
 137/166
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&nbsp;</td><td class="text"><pre class="prettyprint lang-js">'use strict';
&nbsp;
const
 UTIL = require('util'),
 PATH = require('path'),
 EOL = require('os').EOL,
&nbsp;
 Q = require('q'),
&nbsp;
 CoaObject = require('./coaobject'),
 Color = require('./color'),
 Opt = require('./opt'),
 Arg = require('./arg'),
 completion = require('./completion');
&nbsp;
/**
 * Command
 *
 * Top level entity. Commands may have options and arguments.
 *
 * @namespace
 * @class Cmd
 * @extends CoaObject
 */
class Cmd extends CoaObject {
 /**
 * @constructs
 * @param {COA.Cmd} [cmd] parent command
 */
 constructor(cmd) {
 super(cmd);
&nbsp;
 this._parent(cmd);
 this._cmds = [];
 this._cmdsByName = {};
 this._opts = [];
 this._optsByKey = {};
 this._args = [];
 this._api = null;
 this._ext = false;
 }
&nbsp;
 static create(cmd) {
 return new Cmd(cmd);
 }
&nbsp;
 /**
 * Returns object containing all its subcommands as methods
 * to use from other programs.
 *
 * @returns {Object}
 */
 get api() {
 // Need _this here because of passed arguments into _api
 const _this = this;
 this._api || (this._api = function () {
 return _this.invoke.apply(_this, arguments);
 });
&nbsp;
 const cmds = this._cmdsByName;
 Object.keys(cmds).forEach((c) =&gt; {
 this._api[c] = cmds[c].api;
 });
 return this._api;
 }
&nbsp;
 _parent(cmd) {
 this._cmd = cmd || this;
&nbsp;
 this.isRootCmd
 || cmd._cmds.push(this)
 &amp;&amp; this._name
 &amp;&amp; (this._cmd._cmdsByName[this._name] = this);
&nbsp;
 return this;
 }
&nbsp;
 get isRootCmd() {
 return this._cmd === this;
 }
&nbsp;
 /**
 * Set a canonical command identifier to be used anywhere in the API.
 *
 * @param {String} name - command name
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 name(name) {
 super.name(name);
&nbsp;
 this.isRootCmd
 || (this._cmd._cmdsByName[name] = this);
&nbsp;
 return this;
 }
&nbsp;
 /**
 * Create new or add existing subcommand for current command.
 *
 * @param {COA.Cmd} [cmd] existing command instance
 * @returns {COA.Cmd} new subcommand instance
 */
 cmd(cmd) {
 return cmd?
 cmd._parent(this)
 : new Cmd(this);
 }
&nbsp;
 /**
 * Create option for current command.
 *
 * @returns {COA.Opt} new option instance
 */
 opt() {
 return new Opt(this);
 }
&nbsp;
 /**
 * Create argument for current command.
 *
 * @returns {COA.Opt} new argument instance
 */
 arg() {
 return new Arg(this);
 }
&nbsp;
 /**
 * Add (or set) action for current command.
 *
 * @param {Function} act - action function,
 * invoked in the context of command instance
 * and has the parameters:
 * - {Object} opts - parsed options
 * - {String[]} args - parsed arguments
 * - {Object} res - actions result accumulator
 * It can return rejected promise by Cmd.reject (in case of error)
 * or any other value treated as result.
 * @param {Boolean} [force=false] flag for set action instead add to existings
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 act(act, force) {
 Iif(!act) return this;
&nbsp;
 (!this._act || force) &amp;&amp; (this._act = []);
 this._act.push(act);
&nbsp;
 return this;
 }
&nbsp;
 /**
 * Make command "helpful", i.e. add -h --help flags for print usage.
 *
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 helpful() {
 return this.opt()
 .name('help')
 .title('Help')
 .short('h')
 .long('help')
 .flag()
 .only()
 .act(function() {
 return this.usage();
 })
 .end();
 }
&nbsp;
 /**
 * Adds shell completion to command, adds "completion" subcommand,
 * that makes all the magic.
 * Must be called only on root command.
 *
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 completable() {
 return this.cmd()
 .name('completion')
 .apply(completion)
 .end();
 }
&nbsp;
 /**
 * Allow command to be extendable by external node.js modules.
 *
 * @param {String} [pattern] Pattern of node.js module to find subcommands at.
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 extendable(pattern) {
 this._ext = pattern || true;
 return this;
 }
&nbsp;
 _exit(msg, code) {
 return process.once('exit', function() {
 msg &amp;&amp; console.error(msg);
 return process.exit(code || 0);
 });
 }
&nbsp;
 /**
 * Build full usage text for current command instance.
 *
 * @returns {String} usage text
 */
 usage() {
 const res = [];
&nbsp;
 this._title &amp;&amp; res.push(this._fullTitle());
&nbsp;
 res.push('', 'Usage:');
&nbsp;
 this._cmds.length
 &amp;&amp; res.push([
 '', '', Color('lred', this._fullName()), Color('lblue', 'COMMAND'),
 Color('lgreen', '[OPTIONS]'), Color('lpurple', '[ARGS]')
 ].join(' '));
&nbsp;
 (this._opts.length + this._args.length)
 &amp;&amp; res.push([
 '', '', Color('lred', this._fullName()),
 Color('lgreen', '[OPTIONS]'), Color('lpurple', '[ARGS]')
 ].join(' '));
&nbsp;
 res.push(
 this._usages(this._cmds, 'Commands'),
 this._usages(this._opts, 'Options'),
 this._usages(this._args, 'Arguments')
 );
&nbsp;
 return res.join(EOL);
 }
&nbsp;
 _usage() {
 return Color('lblue', this._name) + ' : ' + this._title;
 }
&nbsp;
 _usages(os, title) {
 if(!os.length) return;
&nbsp;
 return ['', title + ':']
 .concat(os.map(o =&gt; ` ${o._usage()}`))
 .join(EOL);
 }
&nbsp;
 _fullTitle() {
 return `${this.isRootCmd? '' : this._cmd._fullTitle() + EOL}${this._title}`;
 }
&nbsp;
 _fullName() {
 return `${this.isRootCmd? '' : this._cmd._fullName() + ' '}${PATH.basename(this._name)}`;
 }
&nbsp;
 _ejectOpt(opts, opt) {
 const pos = opts.indexOf(opt);
 if(pos === -1)
 return;
&nbsp;
 return opts[pos]._arr?
 opts[pos]
 : opts.splice(pos, 1)[0];
 }
&nbsp;
 _checkRequired(opts, args) {
 if(this._opts.some(opt =&gt; opt._only &amp;&amp; opt._name in opts)) return;
&nbsp;
 const all = this._opts.concat(this._args);
 let i;
 while(i = all.shift())
 if(i._req &amp;&amp; i._checkParsed(opts, args))
 return this.reject(i._requiredText());
 }
&nbsp;
 _parseCmd(argv, unparsed) {
 unparsed || (unparsed = []);
&nbsp;
 let i,
 optSeen = false;
 while(i = argv.shift()) {
 i.indexOf('-') || (optSeen = true);
&nbsp;
 if(optSeen || !/^\w[\w-_]*$/.test(i)) {
 unparsed.push(i);
 continue;
 }
&nbsp;
 let pkg, cmd = this._cmdsByName[i];
 if(!cmd &amp;&amp; this._ext) {
 if(typeof this._ext === 'string') {
 pkg = ~this._ext.indexOf('%s')?
 UTIL.format(this._ext, i)
 : this._ext + i;
&nbsp;
 } else Eif(this._ext === true) {
 pkg = i;
 let c = this;
 while(true) { // eslint-disable-line
 pkg = c._name + '-' + pkg;
 if(c.isRootCmd) break;
 c = c._cmd;
 }
 }
&nbsp;
 const cmdDesc = tryCatch(() =&gt; require(pkg));
 Eif(cmdDesc) {
 if(typeof cmdDesc === 'function') {
 this.cmd().name(i).apply(cmdDesc).end();
&nbsp;
 } else Eif(typeof cmdDesc === 'object') {
 this.cmd(cmdDesc);
 cmdDesc.name(i);
&nbsp;
 } else throw new Error('Error: Unsupported command declaration type, '
 + 'should be a function or COA.Cmd() object');
&nbsp;
 cmd = this._cmdsByName[i];
 }
 }
&nbsp;
 if(cmd) return cmd._parseCmd(argv, unparsed);
&nbsp;
 unparsed.push(i);
 }
&nbsp;
 return { cmd : this, argv : unparsed };
 }
&nbsp;
 _parseOptsAndArgs(argv) {
 const opts = {},
 args = {},
 nonParsedOpts = this._opts.concat(),
 nonParsedArgs = this._args.concat();
&nbsp;
 let res, i;
 while(i = argv.shift()) {
 if(i !== '--' &amp;&amp; i[0] === '-') {
 const m = i.match(/^(--\w[\w-_]*)=(.*)$/);
 if(m) {
 i = m[1];
 this._optsByKey[i]._flag || argv.unshift(m[2]);
 }
&nbsp;
 const opt = this._ejectOpt(nonParsedOpts, this._optsByKey[i]);
 if(!opt) return this.reject(`Unknown option: ${i}`);
&nbsp;
 if(Q.isRejected(res = opt._parse(argv, opts))) return res;
&nbsp;
 continue;
 }
&nbsp;
 i === '--' &amp;&amp; (i = argv.splice(0));
 Array.isArray(i) || (i = [i]);
&nbsp;
 let a;
 while(a = i.shift()) {
 let arg = nonParsedArgs.shift();
 if(!arg) return this.reject(`Unknown argument: ${a}`);
&nbsp;
 arg._arr &amp;&amp; nonParsedArgs.unshift(arg);
 Iif(Q.isRejected(res = arg._parse(a, args))) return res;
 }
 }
&nbsp;
 return {
 opts : this._setDefaults(opts, nonParsedOpts),
 args : this._setDefaults(args, nonParsedArgs)
 };
 }
&nbsp;
 _setDefaults(params, desc) {
 for(const item of desc)
 item._def
 &amp;&amp; !(item._name in params)
 &amp;&amp; item._saveVal(params, item._def);
&nbsp;
 return params;
 }
&nbsp;
 _processParams(params, desc) {
 const notExists = [];
&nbsp;
 for(const item of desc) {
 const n = item._name;
&nbsp;
 Iif(!(n in params)) {
 notExists.push(item);
 continue;
 }
&nbsp;
 const vals = [].concat(params[n]);
 delete params[n];
&nbsp;
 let res;
 for(const v of vals)
 Iif(Q.isRejected(res = item._saveVal(params, v)))
 return res;
 }
&nbsp;
 return this._setDefaults(params, notExists);
 }
&nbsp;
 _parseArr(argv) {
 return Q.when(this._parseCmd(argv), (p) =&gt;
 Q.when(p.cmd._parseOptsAndArgs(p.argv), (r) =&gt; ({
 cmd : p.cmd,
 opts : r.opts,
 args : r.args
 })));
 }
&nbsp;
 _do(inputPromise) {
 return Q.when(inputPromise, (input) =&gt; {
 return [this._checkRequired]
 .concat(input.cmd._act || [])
 .reduce((res, act) =&gt;
 Q.when(res, (prev) =&gt; act.call(input.cmd, input.opts, input.args, prev)),
 void 0);
 });
 }
&nbsp;
 /**
 * Parse arguments from simple format like NodeJS process.argv
 * and run ahead current program, i.e. call process.exit when all actions done.
 *
 * @param {String[]} argv - arguments
 * @returns {COA.Cmd} - this instance (for chainability)
 */
 run(argv) {
 argv || (argv = process.argv.slice(2));
&nbsp;
 const cb = (code) =&gt; (res) =&gt; res?
 this._exit(res.stack || res.toString(), res.exitCode || code)
 : this._exit();
&nbsp;
 Q.when(this.do(argv), cb(0), cb(1)).done();
&nbsp;
 return this;
 }
&nbsp;
 /**
 * Invoke specified (or current) command using provided
 * options and arguments.
 *
 * @param {String|String[]} [cmds] - subcommand to invoke (optional)
 * @param {Object} [opts] - command options (optional)
 * @param {Object} [args] - command arguments (optional)
 * @returns {Q.Promise}
 */
 invoke(cmds, opts, args) {
 cmds || (cmds = []);
 opts || (opts = {});
 args || (args = {});
 typeof cmds === 'string' &amp;&amp; (cmds = cmds.split(' '));
&nbsp;
 if(arguments.length &lt; 3 &amp;&amp; !Array.isArray(cmds)) {
 args = opts;
 opts = cmds;
 cmds = [];
 }
&nbsp;
 return Q.when(this._parseCmd(cmds), (p) =&gt; {
 if(p.argv.length)
 return this.reject(`Unknown command: ${cmds.join(' ')}`);
&nbsp;
 return Q.all([this._processParams(opts, this._opts), this._processParams(args, this._args)])
 .spread((_opts, _args) =&gt;
 this._do({
 cmd : p.cmd,
 opts : _opts,
 args : _args
 })
 .fail((res) =&gt; (res &amp;&amp; res.exitCode === 0)?
 res.toString()
 : this.reject(res)));
 });
 }
}
&nbsp;
/**
 * Convenient function to run command from tests.
 *
 * @param {String[]} argv - arguments
 * @returns {Q.Promise}
 */
Cmd.prototype.do = function(argv) {
 return this._do(this._parseArr(argv || []));
};
&nbsp;
function tryCatch(fn, cb) {
 try {
 return fn();
 } catch(e) {
 return cb(e);
 }
}
&nbsp;
module.exports = Cmd;
&nbsp;</pre></td></tr>
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