##
 # Flattens the icons object to a one-dimensional array of possible search terms.
 
 require 'set'
 
 module Jekyll
   module FlattenArray
     def flattenIconFilters(icons)
       flattened = Set.new
       icons.each do |icon|
         toAdd = []
 
         toAdd.push(icon["class"].downcase) # Add class as a filter value
 
         # Add any existing aliases as a filter value
         if not icon["aliases"].nil?
           icon["aliases"].each do |iconAlias|
             toAdd.push(iconAlias.downcase)
           end
         end
 
         # Add any existing filters as a filter value
         if not icon["filter"].nil?
           icon["filter"].each do |iconFilter|
             toAdd.push(iconFilter.downcase)
           end
         end
         flattened.merge(toAdd)
 
         print toAdd if toAdd.include? true
         print toAdd if toAdd.include? false
       end
       return flattened.to_a # .to_a because we can't jsonify a <Set>
     end
   end
 end
 
 Liquid::Template.register_filter(Jekyll::FlattenArray)