UnitConversion Ubiquity command (uses GNU Units)

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var UnitConversion = {};

UnitConversion.convert = function(from, to, callback) {
  jQuery.get('http://www.sabberworm.com/get_file/units/', {from: from, to: to}, callback);
};

UnitConversion.conversionFinished = function(data, textStatus) {
  if(data.indexOf('invalid') !== -1) {
    displayMessage(data);
    return;
  }
  CmdUtils.setSelection(data);
};

UnitConversion.prepareFrom = function(modifiers) {
  var from = CmdUtils.getSelection();
  if(modifiers['from']) {
    from = modifiers['from'].text;
  }
  from = from.replace(/(\d+)\s*\/\s*(\d+)/, "$1|$2");
  from = from.replace(/(USD|\$)(d+)/, 'USD $2');
  return from;
};

UnitConversion.getPreview = function(previewBlock, input, modifiers) {
  var short_message = "Converts ${from} to ${to}";
  var long_message = CmdUtils.renderTemplate(short_message, {from: '${from} (${converted_from})', to: '${to}'});
  
  var from = UnitConversion.prepareFrom(modifiers);
  var to = input.text;
  
  previewBlock.innerHTML = CmdUtils.renderTemplate(short_message, {from: from, to: to});
  
  if(!from) {
    return;
  }
  
  UnitConversion.convert(from, '', function(data, textStatus) {
    previewBlock.innerHTML = CmdUtils.renderTemplate(long_message, {from: from, converted_from: data, to: to});
  });
};


CmdUtils.CreateCommand({
  name: 'unit-convert',
  takes: {to: noun_arb_text},
  modifiers: {from: noun_arb_text},
  preview: UnitConversion.getPreview,
  execute: function(input, modifiers) {
    UnitConversion.convert(UnitConversion.prepareFrom(modifiers), input.text, UnitConversion.conversionFinished);
  },
  description: "Converts the unit of the selected text (or the from modifier) to the specfied unit using GNU Units.",
  author: {name: 'Raphael Schweikert', homepage: 'http://www.sabberworm.com/'}
});