gistfile1.txt

function depth_first_categories(category){
  category.categories.forEach(function(category){
    emit(category.name, category);
    depth_first_categories(category);
  }
}
function(doc) {
  if (doc['couchrest-type'] == 'CategoryList' && doc.categories) {
    doc.categories.forEach(function(category){
      depth_first_categories(category);
    });
  }
}