ansi.js

var fg = {
    30: 'fg-black'
  , 31: 'fg-red'
  , 32: 'fg-green'
  , 33: 'fg-yellow'
  , 34: 'fg-blue'
  , 35: 'fg-magenta'
  , 36: 'fg-cyan'
  , 37: 'fg-white'
  , 90: 'fg-grey'
};

var bg = {
    40: 'bg-black'
  , 41: 'bg-red'
  , 42: 'bg-green'
  , 43: 'bg-yellow'
  , 44: 'bg-blue'
  , 45: 'bg-magenta'
  , 46: 'bg-cyan'
  , 47: 'bg-white'
};

var decoration = {
    1: 'bold'
  , 3: 'italic'
  , 4: 'underline'
};

function parse(str) {
  return str.replace(/\033\[(\d+(?:;\d+)*)m(.*?)(?=\033|$)/g, function(_, val, str){
    var classes = val.split(';').map(function(val){
      return fg[val]
        || bg[val]
        || decoration[val]
        || 'normal';
    });

    return '<span class="' + classes.join(' ') + '">'
      + str
      + '</span>';
  });
}