node-getopt

node-getopt
===========
Featured command line parser.

Basic Usage
-----------

Parse Commandline

code: oneline.js

// node-getopt oneline example.
opt = require('node-getopt').create([
['s' , '' , 'short option.'],
['' , 'long' , 'long option.'],
['S' , 'short-with-arg=ARG' , 'option with argument', 'S'],
['L' , 'long-with-arg=ARG' , 'long option with argument'],
['' , 'color[=COLOR]' , 'COLOR is optional'],
['m' , 'multi-with-arg=ARG+' , 'multiple option with argument'],
['' , 'no-comment'],
['h' , 'help' , 'display this help'],
['v' , 'version' , 'show version']
]) // create Getopt instance
.bindHelp() // bind option 'help' to default action
.parseSystem(); // parse command line

console.info({argv: opt.argv, options: opt.options});

$ node oneline.js foo -s --long-with-arg bar -m a -m b -- --others

{ argv: [ 'foo', '--others' ],
options:
{ 'short-with-arg': 'S',
s: true,
'long-with-arg': 'bar',
'multi-with-arg': [ 'a', 'b' ],
S: 'S',
L: 'bar',
m: [ 'a', 'b' ] } }

$ node oneline.js -h

Usage: node oneline.js

-s short option.
--long long option.
-S, --short-with-arg=ARG option with argument
-L, --long-with-arg=ARG long option with argument
--color[=COLOR] COLOR is optional
-m, --multi-with-arg=ARG+ multiple option with argument
--no-comment
-h, --help display this help
-v, --version show version

code: simple.js

// examples/simple.js
// argv parse
Getopt = require('node-getopt');

// Getopt arguments options
// '=': has argument
// '[=]': has argument but optional
// '+': multiple option supported
getopt = new Getopt([
['s'],
['S' , '='],
['' , 'long-with-arg=ARG'],
['m' , '=+'],
['' , 'color[=COLOR]'],
['h' , 'help']
]).bindHelp();

// process.argv needs slice(2) for it starts with 'node' and 'script name'
// parseSystem is alias of parse(process.argv.slice(2))
// opt = getopt.parseSystem();
opt = getopt.parse(process.argv.slice(2));
console.info({argv: opt.argv, options: opt.options});

$ node simple.js foo -s --long-with-arg bar -m a -m b -- --others

{ argv: [ 'foo', '--others' ],
options: { s: true, 'long-with-arg': 'bar', m: [ 'a', 'b' ] } }

Work with help

code: help.js

// examples/help.js
// Works with help
Getopt = require('node-getopt');

getopt = new Getopt([
['s' , '' , 'short option.'],
['' , 'long' , 'long option.'],
['S' , 'short-with-arg=ARG' , 'option with argument', 'S'],
['L' , 'long-with-arg=ARG' , 'long option with argument'],
['' , 'color[=COLOR]' , 'COLOR is optional'],
['m' , 'multi-with-arg=ARG+' , 'multiple option with argument'],
['' , 'no-comment'],
['h' , 'help' , 'display this help']
]);

// Use custom help template instead of default help
// [[OPTIONS]] is the placeholder for options list
getopt.setHelp(
"Usage: node help.js [OPTION]\n" +
"node-getopt help demo.\n" +
"\n" +
"[[OPTIONS]]\n" +
"\n" +
"Installation: npm install node-getopt\n" +
"Respository: https://github.com/jiangmiao/node-getopt"
);

getopt.showHelp();

$ node examples/help.js

Usage: node help.js [OPTION]
node-getopt help demo.

-s short option.
--long long option.
-S, --short-with-arg=ARG option with argument (default: S)
-L, --long-with-arg=ARG long option with argument
--color[=COLOR] COLOR is optional
-m, --multi-with-arg=ARG+ multiple option with argument
--no-comment
-h, --help display this help

Installation: npm install node-getopt
Respository: https://github.com/jiangmiao/node-getopt

Features
--------

short option name

$ node simple.js -s
{ argv: [], options: { short: true } }

$ node simple.js -S foo
{ argv: [], options: { 'short-with-arg': 'foo' } }

long option name

$ node simple.js --long
{ argv: [], options: { long: true } }

$ node simple.js --long-with-arg foo
{ argv: [], options: { 'long-with-arg': 'foo' } }

argument required

$ node simple.js --long-with-arg
ERROR: option long-with-arg need argument

$ node simple.js --long-with-arg foo
{ argv: [], options: { 'long-with-arg': 'foo' } }

$ node simple.js --long-with-arg=foo
{ argv: [], options: { 'long-with-arg': 'foo' } }

optional argument

$ node simple.js --color
{ argv: [], options: { color: '' } }

$ node simple.js --color=foo
{ argv: [], options: { color: 'foo' } }

$ node simple.js --color foo
{ argv: [ 'foo' ], options: { color: '' }

chain option

$ node simple.js -slS foo
{ argv: [],
options: { short: true, long: true, 'short-with-arg': 'foo' } }

multi option supported

$ node simple.js -m a -m b -m c
{ argv: [], options: { 'multi-with-arg': [ 'a', 'b', 'c' ] } }

text argv supported

$ node simple.js foo -m a bar -m b baz -m c
{ argv: [ 'foo', 'bar', 'baz' ],
options: { 'multi-with-arg': [ 'a', 'b', 'c' ] } }

keep text after --

$ node simple.js -s -- -s
{ argv: [ '-s' ], options: { short: true } }

References
----------

require('node-getopt') returns class Getopt

Getopt Methods:

constructor(Array options)
options is a set of option. each option contains 4 fields.
[short_name, long_name_with_definition, comment, default]
Definition:
* '=ARG': has argument
* '[=ARG]': has argument but optional
* '+': multiple option supported

ARG can be replaced by any word.

Getopt parse(Array argv)
parse argv

Returns: {argv: '...', options: {...}, ...}

Getopt parseSystem()
alias of parse(process.argv.slice(2))

Getopt setHelp(String helpTemplate)
Set help template. the placeholders will be replaced by getopt.

Placeholders:
* [[OPTIONS]] - The options list

Returns: String

String getHelp()
Get the help generated.

Getopt showHelp()
console.info(getopt.getHelp());

Getopt bindHelp([String HELP])
set help template to HELP if HELP is not empty.
bind 'help' option to default action, show help and exit with 0.

Getpot on(String optionName, Function action)
trigger the action when optionName is found.
the 'this' in action will be the instance of Getopt.

Getopt error(Function callback)
when parse failed callback will be trigger. default is display error message and exit with 1.

Getopt Static Methods:

create(Array options)
equals new Getopt(options)

Others:

default help template:

"Usage: node #{process.argv[1].match(/(?:.[\/\\])?(.)$/)[1]}\n\n[[OPTIONS]]\n"

Remarks
-------

v0.2. is NOT compatible with v0.1.