var firstLineLimit = 30;
var secondLineLimit = 55;

$("<Textarea id>").keyup(function () {
  var value = $(this).val();

  var lines = value.split("\n");
  var totalLines = lines.length;

  var firstLine = lines[0];
  var firstLineLength = firstLine.length;
  var firstLineRest = '';

  var cursorPosition = $(this).caret().start;

  // If the first line is too long, susbtract the rest.
  if (firstLineLength > firstLineLimit) {
  	// Get the rest of the first line.
  	var restLength = firstLineLength - firstLineLimit;
  	firstLineRest = firstLine.substr(firstLineLimit, restLength);

  	// Substract the first line to its maximum length.
  	firstLine = firstLine.substr(0, firstLineLimit);
  }

  // Write rest of chars for first line to screen.
  $('<wrapper id> .first-line').html(firstLineLimit - firstLine.length);

  // Remove the first line from the text part.
  var restLines = lines.splice(1, (lines.length - 1));

  // Paste the rest of the lines together as the second line.
  var secondLine = restLines.join(' ');

  // Paste the rest of the first line together with the second line.
  secondLine = firstLineRest + secondLine;

  var secondLineLength = secondLine.length;

  // If the second line is too long, susbtract the rest.
  if (secondLineLength > secondLineLimit) {
  	// Substract the second line to its maximum length.
  	secondLine = secondLine.substr(0, secondLineLimit);
  }

  // Write rest of chars for second line to screen.
  $('<wrapper id> .second-line').html(secondLineLimit - secondLine.length);

  // If there is a second line or there were multiple lines,
  // add the newline to the first line.
  if (secondLine.length || (totalLines > 1)) {
  	// Paste first and second line together with a newline in between.
  	value = firstLine + "\n" + secondLine;
  }

  // Else, just keep the first line as a value.
  else {
  	value = firstLine;
  }

  // Fill in the new value.
  $(this).val(value).caret(cursorPosition, cursorPosition);
});