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opt.js
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opt.js
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var Cmd, Color, Opt, fs;
fs = require('fs');
Color = require('./color').Color;
Cmd = require('./cmd').Cmd;
/**
## Option
Named entity. Options may have short and long keys for use from command line.
@namespace
@class Presents option
*/
exports.Opt = Opt = (function() {
/**
@constructs
@param {COA.Cmd} cmd parent command
*/ function Opt(_cmd) {
this._cmd = _cmd;
this._cmd._opts.push(this);
}
/**
Set a canonical option identifier to be used anywhere in the API.
@param {String} _name option name
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.name = function(_name) {
this._name = _name;
return this;
};
/**
Set a long description for option to be used anywhere in text messages.
@param {String} _title option title
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.title = Cmd.prototype.title;
/**
Set a short key for option to be used with one hyphen from command line.
@param {String} _short
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.short = function(_short) {
this._short = _short;
return this._cmd._optsByKey['-' + _short] = this;
};
/**
Set a short key for option to be used with double hyphens from command line.
@param {String} _long
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.long = function(_long) {
this._long = _long;
return this._cmd._optsByKey['--' + _long] = this;
};
/**
Make an option boolean, i.e. option without value.
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.flag = function() {
this._flag = true;
return this;
};
/**
Makes an option accepts multiple values.
Otherwise, the value will be used by the latter passed.
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.arr = function() {
this._arr = true;
return this;
};
/**
Makes an option required.
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.req = function() {
this._req = 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)
*/
Opt.prototype.only = function() {
this._only = true;
return this;
};
/**
Set a validation (or value) function for option.
Value from command line passes through before becoming available from API.
Using for validation and convertion simple types to any values.
@param {Function} _val validating function,
invoked in the context of option instance
and has one parameter with value from command line
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.val = function(_val) {
this._val = _val;
return this;
};
/**
Set a default value for option.
Default value passed through validation function as ordinary value.
@param {Object} _def
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.def = function(_def) {
this._def = _def;
return this;
};
/**
Make option value outputing stream.
It's add useful validation and shortcut for STDOUT.
@returns {COA.Opt} this instance (for chainability)
*/
Opt.prototype.output = function() {
return this.def(process.stdout).val(function(v) {
if (typeof v === 'string') {
if (v === '-') {
return process.stdout;
} else {
return fs.createWriteStream(v, {
encoding: 'utf8'
});
}
} else {
return v;
}
});
};
/**
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)
*/
Opt.prototype.act = function(act) {
var name, opt;
opt = this;
name = this._name;
this._cmd.act(function(opts) {
var res;
if (name in opts) {
res = act.apply(this, arguments);
if (opt._only) {
return this.reject({
toString: function() {
return res;
},
exitCode: 0
});
} else {
return res;
}
}
});
return this;
};
Opt.prototype._saveVal = function(opts, val) {
var _name;
if (this._val) {
val = this._val(val);
}
if (this._arr) {
(opts[_name = this._name] || (opts[_name] = [])).push(val);
} else {
opts[this._name] = val;
}
return this;
};
Opt.prototype._parse = function(argv, opts) {
return this._saveVal(opts, this._flag ? true : argv.shift());
};
Opt.prototype._checkParsed = function(opts, args) {
return !opts.hasOwnProperty(this._name);
};
Opt.prototype._usage = function() {
var nameStr, res;
res = [];
nameStr = this._name.toUpperCase();
if (this._short) {
res.push('-', Color('lgreen', this._short));
if (!this._flag) {
res.push(' ' + nameStr);
}
res.push(', ');
}
if (this._long) {
res.push('--', Color('green', this._long));
if (!this._flag) {
res.push('=' + nameStr);
}
}
res.push(' : ', this._title);
return res.join('');
};
Opt.prototype._requiredText = function() {
return 'Missing required option:\n ' + this._usage();
};
/**
Finish chain for current option and return parent command instance.
@returns {COA.Cmd} parent command
*/
Opt.prototype.end = Cmd.prototype.end;
return Opt;
})();