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'use strict';
const
Q = require('q'),
CoaParam = require('./coaparam'),
chalk = require('chalk');
/**
* Option
*
* Named entity. Options may have short and long keys for use from command line.
*
* @namespace
* @class Opt
* @extends CoaParam
*/
module.exports = class Opt extends CoaParam {
/**
* @constructs
* @param {COA.Cmd} cmd - parent command
*/
constructor(cmd) {
super(cmd);
this._short = null;
this._long = null;
this._flag = false;
this._only = false;
this._cmd._opts.push(this);
}
/**
* Set a short key for option to be used with one hyphen from command line.
*
* @param {String} short - short name
* @returns {COA.Opt} - this instance (for chainability)
*/
short(short) {
this._short = short;
this._cmd._optsByKey[`-${short}`] = this;
return this;
}
/**
* Set a short key for option to be used with double hyphens from command line.
*
* @param {String} long - long name
* @returns {COA.Opt} - this instance (for chainability)
*/
long(long) {
this._long = long;
this._cmd._optsByKey[`--${long}`] = this;
return this;
}
/**
* Make an option boolean, i.e. option without value.
*
* @returns {COA.Opt} - this instance (for chainability)
*/
flag() {
this._flag = true;
return this;
}
/**
* Makes an option to act as a command,
* i.e. program will exit just after option action.
*
* @returns {COA.Opt} - this instance (for chainability)
*/
only() {
this._only = true;
return this;
}
/**
* Add action for current option command.
* This action is performed if the current option
* is present in parsed options (with any value).
*
* @param {Function} act - action function,
* invoked in the context of command instance
* and has the parameters:
* - {Object} opts - parsed options
* - {Array} 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.
* @returns {COA.Opt} - this instance (for chainability)
*/
act(act) {
// Need function here for arguments
const opt = this;
this._cmd.act(function(opts) {
if(!opts.hasOwnProperty(opt._name)) return;
const res = act.apply(this, arguments);
if(!opt._only) return res;
return Q.when(res, out => this.reject({
toString : () => out.toString(),
exitCode : 0
}));
});
return this;
}
_saveVal(opts, val) {
this._val && (val = this._val(val));
const name = this._name;
this._arr
? (opts[name] || (opts[name] = [])).push(val)
: (opts[name] = val);
return val;
}
_parse(argv, opts) {
return this._saveVal(opts, this._flag ? true : argv.shift());
}
_checkParsed(opts) {
return !opts.hasOwnProperty(this._name);
}
_usage() {
const res = [],
nameStr = this._name.toUpperCase();
if(this._short) {
res.push('-', chalk.greenBright(this._short));
this._flag || res.push(' ' + nameStr);
res.push(', ');
}
if(this._long) {
res.push('--', chalk.green(this._long));
this._flag || res.push('=' + nameStr);
}
res.push(' : ', this._title);
this._req && res.push(' ', chalk.redBright('(required)'));
return res.join('');
}
_requiredText() {
return `Missing required option:\n ${this._usage()}`;
}
};