dargs

Reverse minimist. Convert an object of options into an array of command-line arguments.

Useful when spawning command-line tools.

Install

$ npm install dargs

Usage

import dargs from 'dargs';

const object = {
    _: ['some', 'option'],          // Values in '_' will be appended to the end of the generated argument list
    '--': ['separated', 'option'],  // Values in '--' will be put at the very end of the argument list after the escape option (`--`)
    foo: 'bar',
    hello: true,                    // Results in only the key being used
    cake: false,                    // Prepends `no-` before the key
    camelCase: 5,                   // CamelCase is slugged to `camel-case`
    multiple: ['value', 'value2'],  // Converted to multiple arguments
    pieKind: 'cherry',
    sad: ':('
};

const excludes = ['sad', /.*Kind$/];  // Excludes and includes accept regular expressions
const includes = ['camelCase', 'multiple', 'sad', /^pie.*/];
const aliases = {file: 'f'};

console.log(dargs(object, {excludes}));
/*
[
    '--foo=bar',
    '--hello',
    '--no-cake',
    '--camel-case=5',
    '--multiple=value',
    '--multiple=value2',
    'some',
    'option',
    '--',
    'separated',
    'option'
]
*/

console.log(dargs(object, {excludes, includes}));
/*
[
    '--camel-case=5',
    '--multiple=value',
    '--multiple=value2'
]
*/


console.log(dargs(object, {includes}));
/*
[
    '--camel-case=5',
    '--multiple=value',
    '--multiple=value2',
    '--pie-kind=cherry',
    '--sad=:('
]
*/


console.log(dargs({
    foo: 'bar',
    hello: true,
    file: 'baz'
}, {aliases}));
/*
[
    '--foo=bar',
    '--hello',
    '-f', 'baz'
]
*/

API

dargs(object, options?)

object

Type: object

Object to convert to command-line arguments.

options

Type: object

excludes

Type: Array<string | RegExp>

Keys or regex of keys to exclude. Takes precedence over includes.

includes

Type: Array<string | RegExp>

Keys or regex of keys to include.

aliases

Type: object

Maps keys in object to an aliased name. Matching keys are converted to arguments with a single dash (-) in front of the aliased key and the value in a separate array item. Keys are still affected by includes and excludes.

useEquals

Type: boolean
Default: true

Setting this to false makes it return the key and value as separate array items instead of using a = separator in one item. This can be useful for tools that doesn't support --foo=bar style flags.

import dargs from 'dargs';

console.log(dargs({foo: 'bar'}, {useEquals: false}));
/*
[
    '--foo', 'bar'
]
*/

shortFlag

Type: boolean
Default: true

Make a single character option key {a: true} become a short flag -a instead of --a.

import dargs from 'dargs';

console.log(dargs({a: true}));
//=> ['-a']

console.log(dargs({a: true}, {shortFlag: false}));
//=> ['--a']

ignoreTrue

Type: boolean
Default: false

Exclude true values. Can be useful when dealing with argument parsers that only expect negated arguments like --no-foo.

ignoreFalse

Type: boolean
Default: false

Exclude false values. Can be useful when dealing with strict argument parsers that throw on unknown arguments like --no-foo.

allowCamelCase

Type: boolean
Default: false

By default, camel-cased keys will be hyphenated. Enabling this will bypass the conversion process.

import dargs from 'dargs';

console.log(dargs({fooBar: 'baz'}));
//=> ['--foo-bar', 'baz']

console.log(dargs({fooBar: 'baz'}, {allowCamelCase: true}));
//=> ['--fooBar', 'baz']

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