@sidneys/cli-progress

CLI-Progress

Easy to use Progress-Bar for Command-Line/Terminal Applications

Install

$ npm install cli-progress --save
$ yarn add cli-progress --save

Features

• Simple, Robust and Easy to use
• Full customizable output format (constious placeholders are available)
• Custom Bar Characters
• FPS limiter
• ETA calculation based on elapsed time
• Custom Tokens to display additional data (payload) within the bar
• Only visible in TTY environments
• No callbacks required - designed as pure, external controlled UI widget
• Works in Asynchronous and Synchronous tasks
• Preset/Theme support

Usage

Multiple examples are available e.g. example.js - just try it $ node example.js

const _cliProgress = require('cli-progress');

// create a new progress bar instance and use shades_classic theme
const bar1 = new _cliProgress.Bar({}, _cliProgress.Presets.shades_classic);

// start the progress bar with a total value of 200 and start value of 0
bar1.start(200, 0);

// update the current value in your application..
bar1.update(100);

// stop the progress bar
bar1.stop();

Methods/Syntax

Constructor

Initialize a new Progress bar. An instance can be used multiple times! it's not required to re-create it!

const <instance> = new namespace.Bar(options:object [, preset:object]);

Options

• format (type:string) - progress bar output format @see format section
• fps (type:float) - the maximum update rate (default: 10)
• stream (type:stream) - output stream to use (default: process.stderr)
• stopOnComplete (type:boolean) - automatically call stop() when the value reaches the total (default: false)
• clearOnComplete (type:boolean) - clear the progress bar on complete / stop() call (default: false)
• barsize (type:int) - the length of the progress bar in chars (default: 40)
• align (type:char) - position of the progress bar - 'left' (default), 'right' or 'center'
• barCompleteString (type:char) - character to use as "complete" indicator in the bar (default: "=")
• barIncompleteString (type:char) - character to use as "incomplete" indicator in the bar (default: "-")
• hideCursor (type:boolean) - hide the cursor during progress operation; restored on complete (default: false) - pass null to keep terminal settings
• linewrap (type:boolean) - disable line wrapping (default: false) - pass null to keep terminal settings; pass true to add linebreaks automatically (not recommended)
• etaBuffer (type:int) - number of updates with which to calculate the eta; higher numbers give a more stable eta (default: 10)

::start()

Starts the progress bar and set the total and initial value

<instance>.start(totalValue:int, startValue:int [, payload:object = {}]);

::update()

Sets the current progress value and optionally the payload with values of custom tokens as a second parameter

<instance>.update(currentValue:int [, payload:object = {}]);

::increment()

Increases the current progress value by a specified amount (default +1). Update payload optionally

<instance>.increment([delta:int [, payload:object = {}]]);

::setTotal()

Sets the total progress value while progressbar is active. Especially useful handling dynamic tasks.

<instance>.setTotal(totalValue:int);

::stop()

Stops the progress bar and go to next line

<instance>.stop();

Bar Formatting

The progressbar can be customized by using the following build-in placeholders. They can be combined in any order.

• {bar} - the progress bar, customizable by the options barsize, barCompleteString and barIncompleteString
• {percentage} - the current progress in percent (0-100)
• {total} - the end value
• {value} - the current value set by last update() call
• {eta} - expected time of accomplishment in seconds
• {duration} - elapsed time in seconds
• {eta_formatted} - expected time of accomplishment formatted into appropriate units
• {duration_formatted} - elapsed time formatted into appropriate units

Example

progress [{bar}] {percentage}% | ETA: {eta}s | {value}/{total}

is rendered as

progress [========================================] 100% | ETA: 0s | 200/200

Examples

Example 1 - Set Options

// change the progress characters
// set fps limit to 5
// change the output stream and barsize
const bar = new _progress.Bar({
    barCompleteChar: '#',
    barIncompleteChar: '.',
    fps: 5,
    stream: process.stdout,
    barsize: 65,
    position: 'center'
});

Example 2 - Change Styles defined by Preset

// uee shades preset
// change the barsize
const bar = new _progress.Bar({
    barsize: 65,
    position: 'right'
}, _progress.Presets.shades_grey);

Example 3 - Custom Payload

// create new progress bar with custom token "speed"
const bar = new _progress.Bar({
    format: 'progress [{bar}] {percentage}% | ETA: {eta}s | {value}/{total} | Speed: {speed} kbit'
});

// initialize the bar - set payload token "speed" with the default value "N/A"
bar.start(200, 0, {
    speed: "N/A"
});

// some code/update loop
// ...

// update bar value. set custom token "speed" to 125
bar.update(5, {
    speed: '125'
});

// process finished
bar.stop();

Example 4 - Custom Presets

File mypreset.js

const _colors = require('colors');

module.exports = {
    format: _colors.red(' {bar}') + ' {percentage}% | ETA: {eta}s | {value}/{total} | Speed: {speed} kbit',
    barCompleteChar: '\u2588',
    barIncompleteChar: '\u2591'
};

Application

const _mypreset = require('./mypreset.js');

const bar = new _progress.Bar({
    barsize: 65
}, _mypreset);

Presets/Themes

Need a more modern appearance ? cli-progress supports predefined themes via presets. You are welcome to add your custom one :)

But keep in mind that a lot of the "special-chars" rely on Unicode - it might not work as expected on legacy systems.

Default Presets

The following presets are included by default

• legacy - Styles as of cli-progress v1.3.0
• shades-classic - Unicode background shades are used for the bar
• shades-grey - Unicode background shades with grey bar
• rect - Unicode Rectangles

Any Questions ? Report a Bug ? Enhancements ?

Please open a new issue on GitHub

License

CLI-Progress is OpenSource and licensed under the Terms of The MIT License (X11). You're welcome to contribute!