hard wrap selected textarea to 72 columns

hardwrap.js

(function() {
function wrap(s, maxLength) {
  return s.split(' ').reduce(function(acc, x) {
    var i = acc.length - 1;
    var last = acc[i] == '' ? x : (acc[i] + ' ' + x);

    if (last.length > maxLength) {
      acc.push(x);
    } else {
      acc[i] = last;
    }

    return acc;
  }, ['']).join('\n')
};

var maxLength = 72;

document.activeElement.value = wrap(document.activeElement.value, maxLength);
}());