This is just a quick example of how to use the raw ASCII output from CAVA in an application

cava_ascii_output_parser.js

// A minimal set of NodeJS code for parsing incoming ASCII data from CAVA and turning it into useful data.
// This code would need to have cava's output piped to it:
// Ex: $ cava -p ~/.config/cava/raw | node cava_ascii_output_parser.js

process.stdin.setEncoding('utf8');

let str = '';
process.stdin.on('readable', () => {
  let chunk;
	
  // Use a loop to make sure we read all available data.
  while ((chunk = process.stdin.read()) !== null) {
    str += chunk;
		// CAVA's convention for marking the ends of frames is the @ symbol
    const frameEnd = str.indexOf('@');
		
    if (frameEnd > 0) {
      displayFrame(str.substring(0, frameEnd));
      str = str.substring(frameEnd + 1);
    }
  }
});

function displayFrame(f) {
  frame.pop();
	// Bars are separated by semi-colons
  frame.push(f.split(';'));
	
	// Do something with the frames
	// This line references code not present in the gist
  visualizers.forEach(draw);
}

process.stdin.on('end', () => {
  console.log('end');
});