command-line-args

What is command-line-args?

The command-line-args npm package is a library for parsing command-line arguments in Node.js applications. It allows developers to define options and parse them from the command line, making it easier to handle user inputs and configurations.

What are command-line-args's main functionalities?

Basic Argument Parsing

This feature allows you to define and parse basic command-line arguments. In this example, the 'file' option expects a string value, and the 'verbose' option is a boolean flag.

const commandLineArgs = require('command-line-args');

const optionDefinitions = [
  { name: 'file', type: String },
  { name: 'verbose', type: Boolean }
];

const options = commandLineArgs(optionDefinitions);
console.log(options);

Default Values

This feature allows you to set default values for options. If the user does not provide a value for 'file' or 'verbose', the defaults 'default.txt' and 'false' will be used, respectively.

const commandLineArgs = require('command-line-args');

const optionDefinitions = [
  { name: 'file', type: String, defaultValue: 'default.txt' },
  { name: 'verbose', type: Boolean, defaultValue: false }
];

const options = commandLineArgs(optionDefinitions);
console.log(options);

Multiple Values

This feature allows you to handle multiple values for a single option. In this example, the 'files' option can accept multiple string values.

const commandLineArgs = require('command-line-args');

const optionDefinitions = [
  { name: 'files', type: String, multiple: true, defaultOption: true }
];

const options = commandLineArgs(optionDefinitions);
console.log(options);

Aliases

This feature allows you to define aliases for options. In this example, 'help' can be accessed with '-h' and 'version' with '-v'.

const commandLineArgs = require('command-line-args');

const optionDefinitions = [
  { name: 'help', alias: 'h', type: Boolean },
  { name: 'version', alias: 'v', type: Boolean }
];

const options = commandLineArgs(optionDefinitions);
console.log(options);

Other packages similar to command-line-args

yargs

Yargs is a popular library for parsing command-line arguments in Node.js. It provides a rich set of features, including command handling, argument validation, and automatic help generation. Compared to command-line-args, yargs offers more advanced features and a more user-friendly API.

commander

Commander is another widely-used library for building command-line interfaces in Node.js. It supports option parsing, command definitions, and automatic help generation. Commander is known for its simplicity and ease of use, making it a good alternative to command-line-args for simpler use cases.

minimist

Minimist is a lightweight library for parsing command-line arguments. It provides basic functionality for handling options and arguments, but lacks some of the advanced features found in command-line-args, yargs, and commander. Minimist is a good choice for projects that require minimal overhead.

README

command-line-args

Collect command-line options, generate a usage guide..

• Support most option notation styles
  • long options (--find lib.js)
  • short options (-f lib.js)
  • getopt-style combinations (-xvf lib.js)
  • option=val style (--find=lib.js)
• Customisable usage guide generator
• Modular - define reusage option sets.
• Split options into groups, for apps with a large set of options.
• Fine control over validation, type

Install

$ npm install command-line-args --save

API Reference

Modules

command-line-args

definition

definitions

option

## command-line-args ### CliArgs(definitions, argv) ⇒ object ⏏ **Kind**: Exported function

Param	Type
definitions	module:command-line-args.argDefType
argv	Array.<string>

definition

• definition
  • Definition ⏏
    • .name : string
    • .type : function
    • .alias : string
    • .multiple : boolean
    • .value : boolean
    • .defaultOption : boolean
    • .group : string | Array.<string>

Definition ⏏

Option Definition

Kind: Exported class

definition.name : string

Kind: instance property of Definition

definition.type : function

Kind: instance property of Definition

definition.alias : string

a single character

Kind: instance property of Definition

definition.multiple : boolean

Kind: instance property of Definition

definition.value : boolean

Kind: instance property of Definition

definition.defaultOption : boolean

Kind: instance property of Definition

definition.group : string | Array.<string>

Kind: instance property of Definition

definitions

option

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© 2015 Lloyd Brookes <[e-mail]>. Documented by jsdoc-to-markdown.