NoArg - CLI Argument Parser

Introduction

noarg is a lightweight Node.js package designed to simplify command-line argument parsing for CLI applications. With noarg, you can effortlessly define and parse command-line arguments and options, making it easier to build robust and user-friendly command-line interfaces.

Installation

To install noarg package, you can use npm:

npm install noarg

Command Structure

app [command] [fixed length arguments] [any length arguments] [options]

Getting Started

Importing the Package

You can import noarg into your Node.js application as follows:

import NoArg, { t } from 'noarg'

Creating a Command

You can create a command with noarg.create() method. Each command can have its own set of options, arguments, and configurations.

const app = NoArg.create(commandName, commandConfig, commandHandler)

• commandName: Name of the command.
• commandConfig: Configuration object for the command.
• commandHandler: Function to handle the command execution.

Example

const app = NoArg.create(
  'app',
  {
    description: 'This is a test program',
    options: {
      config: t.string().global(),
    },
    arguments: [
      { name: 'arg-1', type: t.number() },
      { name: 'arg-2', type: t.boolean() },
      { name: 'arg-3' },
    ],
    listArgument: {
      name: 'args',
      type: t.string(),
      minLength: 1,
      maxLength: 3,
    },
    config: {},
  },
  (args, options) => {
    console.log({ app: args })
  }
)

Example: Command Structure

node app.js arg-1 true arg-3 listArgs-1 listArgs-2 --config config.json

Types

• t.string(): Defines an option of type string.
• t.number(): Defines an option of type number.
• t.boolean(): Defines an option of type boolean.
• t.array(): Defines an option of type array. (Only available for options)
• t.tuple(): Defines an option of type tuple. (Only available for options)

Tips

• Help option is automatically available.
• Add --use or -u option just after --help or -h option to see how to use it

  Example

  node app.js --help --use
  node app.js -h -u

Conclusion

noarg simplifies the process of parsing command-line arguments for Node.js applications. With its intuitive API and powerful features, you can easily build CLI applications with robust argument handling.