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cli-truncate

Truncate a string to a specific width in the terminal

Gracefully handles ANSI escapes. Like a string styled with chalk. It also supports Unicode surrogate pairs and fullwidth characters.

Install

npm install cli-truncate

Usage

import cliTruncate from 'cli-truncate';

cliTruncate('unicorn', 4);
//=> 'uni…'

// Truncate at different positions
cliTruncate('unicorn', 4, {position: 'start'});
//=> '…orn'

cliTruncate('unicorn', 4, {position: 'middle'});
//=> 'un…n'

cliTruncate('unicorns rainbow dragons', 6, {position: 'end'})
//=> 'unico…'

cliTruncate('\u001B[31municorn\u001B[39m', 4);
//=> '\u001B[31muni\u001B[39m…'

// Truncate Unicode surrogate pairs
cliTruncate('uni\uD83C\uDE00corn', 5);
//=> 'uni\uD83C\uDE00…'

// Truncate fullwidth characters
cliTruncate('안녕하세요', 3);
//=> '안…'

// Truncate the paragraph to the terminal width
const paragraph = 'Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Aenean commodo ligula eget dolor. Aenean massa.';
cliTruncate(paragraph, process.stdout.columns);
//=> 'Lorem ipsum dolor sit amet, consectetuer adipiscing…'

API

cliTruncate(text, columns, options?)

text

Type: string

The text to truncate.

columns

Type: number

The number of columns to occupy in the terminal.

options

Type: object

position

Type: string
Default: 'end'
Values: 'start' | 'middle' | 'end'

The position to truncate the string.

space

Type: boolean
Default: false

Add a space between the text and the ellipsis.

import cliTruncate from 'cli-truncate';

cliTruncate('unicorns', 5, {space: false});
//=> 'unic…'

cliTruncate('unicorns', 5, {space: true});
//=> 'uni …'

cliTruncate('unicorns', 6, {position: 'start', space: true});
//=> '… orns'

cliTruncate('unicorns', 7, {position: 'middle', space: true});
//=> 'uni … s'
preferTruncationOnSpace

Type: boolean
Default: false

Truncate the string from a whitespace if it is within 3 characters from the actual breaking point.

import cliTruncate from 'cli-truncate';

cliTruncate('unicorns rainbow dragons', 20, {position: 'start', preferTruncationOnSpace: true})
//=> '…rainbow dragons'

// without preferTruncationOnSpace
cliTruncate('unicorns rainbow dragons', 20, {position: 'start'})
//=> '…rns rainbow dragons'

cliTruncate('unicorns rainbow dragons', 20, {position: 'middle', preferTruncationOnSpace: true})
//=> 'unicorns…dragons'

cliTruncate('unicorns rainbow dragons', 6, {position: 'end', preferTruncationOnSpace: true})
//=> 'unico…'

// preferTruncationOnSpace would have no effect if space isn't found within next 3 indexes
cliTruncate('unicorns rainbow dragons', 6, {position: 'middle', preferTruncationOnSpace: true})
//=> 'uni…ns'
truncationCharacter

Type: string
Default: …

The character to use at the breaking point.

import cliTruncate from 'cli-truncate';

cliTruncate('unicorns', 5, {position: 'end'});
//=> 'unic…'

cliTruncate('unicorns', 5, {position: 'end', truncationCharacter: '.'});
//=> 'unic.'

cliTruncate('unicorns', 5, {position: 'end', truncationCharacter: ''});
//=> 'unico'

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