gistfile1.js

function separateLines (input, chars) {
  var lines = [];
  
  while (input.length > chars) {
    var text = input.substr(0, chars);
    var i = text.lastIndexOf(" ");
    
    if (i == -1) {
      i = chars - 1;
    }
    
    lines.push(text.substr(0, i));
    input = input.substr(i + 1);
  }
   
  if (input.length > 0) {
    lines.push(input);
  }

  return lines;
}