ofi

Yet another argument parser.

A tiny cli flags parser.

Install

npm i ofi

Usage

Import:

// ESM
import { parse } from 'ofi';

// CJS
const { parse } = require('ofi');

Setup options parser:

import { parse } from 'ofi';

parse(process.argv.slice(2), {
     number: ['size'],
     string: ['foo', 'name', 'surname'],
     boolean: ['dice', 'friendly'],
     array: ['list', 'my-numbers'],
     alias: { foo: ['f'] },
     default: { surname: 'obama', list: [] }
});

This would give the following results:

$ node program.js --size=3 --name barack -f baz --no-dice --friendly
{
  _: [],
  size: 3,
  name: 'barack',
  surname: 'obama',
  foo: 'baz',
  dice: false,
  list: [],
  friendly: true
}

$ node program.js --list a b c -N hi there --myNumbers=13,1,2,3 -fas
{
    _: ['hi', 'there'],
    surname: 'obama',
    list: [ 'a', 'b', 'c' ],
    N: true,
    'my-numbers': [ 13, 1, 2, 3 ],
    foo: true,
    a: true,
    s: true
}

API

parse(arguments, options?)

Function that parses given arguments.
Returns an argument object argv which contains all parsed flags.

argv._ includes all arguments that weren't associated with any option.
Any argument after -- (end-of-flags) won't be parsed and will end up in argv._ and argv['--'] if populate-- option is set to true.

arguments

Type: String | Array<String>
String or an array of strings to be parsed.

For example:

import { parse } from 'ofi';

parse(process.argv.slice(2));

options

Type: Object
Options for parsing given arguments.

boolean

Arguments that should be parsed as booleans.
Type: String | Array<String>

{ boolean: ['dice'] }

Booleans prefixed with --no will be treated as negations.\

string

Arguments that should be parsed as strings.
Type: String | Array<String>

{ string: ['name'] }

number

Arguments that should be parsed as numbers.
Type: String | Array<String>

{ number: ['age'] }

array

Arguments that should be parsed as arrays.
Type: String | Array<String>

{ array: ['list'] }

default

Set default values.
Type: Object

{ default: { name: 'joe' } }

alias

Set aliases of options.
Type: Object

{ alias: { foo: ['f'], baz: 'b' } }

populate--

Populate '--' property in Argv with everything after double-dash (--, aka. end-of-flags).

Type: Boolean
Default: false

parseNumber

Should values that look like numbers be parsed into them.

Type: Boolean
Default: true

NOTE: This doesn't apply to flags marked as strings.

shortFlagGroup

Should a group of short options be treated as seperate flags.
Example: -abc -> { a: true, b: true, c: true }

Type: Boolean
Default: true

camelize

Convert results to camel-case.

Type: Boolean
Default: false

coerce

Custom synchronous function for parsing provided argument.

Type: Object
Default: undefined

{ coerce: { len: (arg) => arg + ' cm' } }

unknown

Callback function that runs whenever a parsed flag has not been defined in options.

Type: Function
Default: undefined

{ unknown: function (flag) { console.log('Unknown flag: "%s"', flag); } }

License

MIT 💖