Introduction to slice-ansi

slice-ansi is a powerful library that enables developers to slice and manipulate strings containing ANSI escape codes efficiently. This library ensures that the integrity of ANSI strings is maintained, making it incredibly useful for creating terminal applications.

API Explanations with Code Snippets

1. sliceAnsi(string, start, end)

Slices the given string from the start index up to, but not including, the end index.

  const sliceAnsi = require('slice-ansi');
  const input = '\u001b[31mHello, \u001b[39mWorld!';
  console.log(sliceAnsi(input, 0, 5)); // '\u001b[31mHello'

2. sliceAnsi.escapes(string)

Returns an array of ANSI escape codes found in the string.

  const sliceAnsi = require('slice-ansi');
  const input = '\u001b[31mHello, \u001b[39mWorld!';
  console.log(sliceAnsi.escapes(input)); // ['\u001b[31m', '\u001b[39m']

3. sliceAnsi.split(string, index)

Splits the string at the specified index into an array containing the two parts.

  const sliceAnsi = require('slice-ansi');
  const input = '\u001b[31mHello, \u001b[39mWorld!';
  console.log(sliceAnsi.split(input, 7)); // ['\u001b[31mHello, ', '\u001b[39mWorld!']

Application Example

Below is an example of a simple terminal application that utilizes slice-ansi to highlight and manipulate text.

  const sliceAnsi = require('slice-ansi');
  const input = '\u001b[32mThis is a test string.\u001b[0m';
  
  // Highlight a part of the string
  const highlightStart = 5;
  const highlightEnd = 10;
  const highlighted = [
    sliceAnsi(input, 0, highlightStart),
    '\u001b[43m', // Yellow background
    sliceAnsi(input, highlightStart, highlightEnd),
    '\u001b[49m', // Reset background
    sliceAnsi(input, highlightEnd)
  ].join('');
  
  console.log(highlighted); // Output string with highlighted portion

In the example, a part of the string is highlighted using ANSI codes. The integrity of the ANSI string is maintained, thanks to slice-ansi.

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