cli-ux

What is cli-ux?

The cli-ux npm package provides a set of utilities for building command-line interfaces (CLIs). It offers features such as progress bars, spinners, prompts, and table formatting to enhance the user experience of CLI applications.

What are cli-ux's main functionalities?

Progress Bar

This feature allows you to display a progress bar in the terminal. The code sample demonstrates how to create and update a progress bar that increments by 5% every 100 milliseconds until it reaches 100%.

const cli = require('cli-ux');

const progress = cli.progress({ format: 'progress [{bar}] {percentage}% | ETA: {eta}s' });
progress.start(100, 0);

let value = 0;
const interval = setInterval(() => {
  value += 5;
  progress.update(value);
  if (value >= 100) {
    clearInterval(interval);
    progress.stop();
  }
}, 100);

Spinner

This feature provides a spinner to indicate ongoing processes. The code sample shows how to start a spinner with a message and stop it after 3 seconds with a 'done' message.

const cli = require('cli-ux');

cli.action.start('Processing');
setTimeout(() => {
  cli.action.stop('done');
}, 3000);

Prompt

This feature allows you to prompt the user for input. The code sample demonstrates how to ask the user for their name and then greet them with the provided input.

const cli = require('cli-ux');

(async () => {
  const name = await cli.prompt('What is your name?');
  console.log(`Hello, ${name}!`);
})();

Table

This feature allows you to display data in a table format. The code sample shows how to create a table with two columns: 'name' and 'age', and display two rows of data.

const cli = require('cli-ux');

const data = [
  { name: 'John', age: 30 },
  { name: 'Jane', age: 25 }
];
cli.table(data, {
  name: {
    minWidth: 7
  },
  age: {
    header: 'Age'
  }
});

Other packages similar to cli-ux

ora

Ora is a lightweight and elegant terminal spinner. It provides similar functionality to the spinner feature in cli-ux but focuses solely on spinners, offering more customization options and better performance.

inquirer

Inquirer is a powerful library for creating interactive command-line prompts. It offers more advanced and flexible prompt types compared to cli-ux, making it a better choice for complex user interactions.

blessed

Blessed is a comprehensive library for building terminal interfaces. It provides a wide range of widgets, including tables, forms, and more, offering greater flexibility and customization than cli-ux.

progress

Progress is a simple and flexible progress bar library for Node.js. It offers similar functionality to the progress bar feature in cli-ux but with a more minimalistic approach and fewer dependencies.

README

cli-ux

cli IO utilities

Usage

The following assumes you have installed cli-ux to your project with npm install cli-ux or yarn add cli-ux and have it required in your script (TypeScript example):

import cli from 'cli-ux'
cli.prompt('What is your name?')

JavaScript:

const {cli} = require('cli-ux')

cli.prompt('What is your name?')

cli.prompt()

Prompt for user input.

// just prompt for input
await cli.prompt('What is your name?')

// mask input after enter is pressed
await cli.prompt('What is your two-factor token?', {type: 'mask'})

// mask input on keypress (before enter is pressed)
await cli.prompt('What is your password?', {type: 'hide'})

// yes/no confirmation
await cli.confirm('Continue?')

// "press any key to continue"
await cli.anykey()

cli.url(text, uri)

Create a hyperlink (if supported in the terminal)

await cli.url('sometext', 'https://google.com')
// shows sometext as a hyperlink in supported terminals
// shows https://google.com in unsupported terminals

cli.open

Open a url in the browser

await cli.open('https://oclif.io')

cli.action

Shows a spinner

// start the spinner
cli.action.start('starting a process')
// show on stdout instead of stderr
cli.action.start('starting a process', {stdout: true})

// stop the spinner
cli.action.stop() // shows 'starting a process... done'
cli.action.stop('custom message') // shows 'starting a process... custom message'

This degrades gracefully when not connected to a TTY. It queues up any writes to stdout/stderr so they are displayed above the spinner.

cli.annotation

Shows an iterm annotation

// start the spinner
cli.annotation('sometest', 'annotated with this text')

cli.wait

Waits for 1 second or given milliseconds

await cli.wait()
await cli.wait(3000)

cli.table

Displays tabular data

cli.table(data, columns, options)

Where:

• data: array of data objects to display
• columns: Table.Columns
• options: Table.Options

cli.table.flags is an object containing all the flags to include in your command class.

{
  columns: Flags.string({exclusive: ['additional'], description: 'only show provided columns (comma-seperated)'}),
  sort: Flags.string({description: 'property to sort by (prepend '-' for descending)'}),
  filter: Flags.string({description: 'filter property by partial string matching, ex: name=foo'}),
  csv: Flags.boolean({exclusive: ['no-truncate'], description: 'output is csv format'}),
  extra: Flags.boolean({char: 'x', description: 'show all columns'}),
  'no-truncate': Flags.boolean({exclusive: ['csv'], description: 'do not truncate output to fit screen'}),
  'no-header': Flags.boolean({exclusive: ['csv'], description: 'hide table header from output'}),
}

Table.Columns defines the table columns and their display options.

const columns: Table.Columns = {
  // where `.name` is a property of a data object
  name: {}, // "Name" inferred as the column header
  id: {
    header: 'ID', // override column header
    minWidth: '10', // column must display at this width or greater
    extra: true, // only display this column when the --extra flag is present
    get: row => `US-O1-${row.id}`, // custom getter for data row object 
  },
}

Table.Options defines the table options, most of which are the parsed flags from the user for display customization, all of which are optional.

const options: Table.Options = {
  printLine: myLogger, // custom logger
  columns: flags.columns,
  sort: flags.sort,
  filter: flags.filter,
  csv: flags.csv,
  extra: flags.extra,
  'no-truncate': flags['no-truncate]',
  'no-header': flags['no-header]',
}

Example class:

import {Command} from '@oclif/command'
import {cli} from 'cli-ux'
import axios from 'axios'

export default class Users extends Command {
  static flags = {
    ...cli.table.flags
  }

  async run() {
    const {flags} = this.parse(Users)
    const {data: users} = await axios.get('https://jsonplaceholder.typicode.com/users')

    cli.table(users, {
      name: {
        minWidth: 7,
      },
      company: {
        get: row => row.company && row.company.name
      },
      id: {
        header: 'ID',
        extra: true
      }
    }, {
      printLine: this.log,
      ...flags, // parsed flags
    })
  }
}

Displays:

$ example-cli users
Name   Team
Jordan Sales
Jamie  Engineering

$ example-cli users --extra
Name   Team        ID
Jordan Sales       100
Jamie  Engineering 200

$ example-cli users --columns=name
Name
Jordan
Jamie

$ example-cli users --filter="team=sales"
Name   Team        ID
Jordan Sales       100

$ example-cli users --sort=team
Name   Team        ID
Jamie  Engineering 200
Jordan Sales       100

cli.tree

Generate a tree and display it

let tree = cli.tree()
tree.insert('foo')
tree.insert('bar')

let subtree = cli.tree()
subtree.insert('qux')
tree.nodes.bar.insert('baz', subtree)

tree.display()

Outputs:

├─ foo
└─ bar
   └─ baz
      └─ qux