gistfile1.rb

preprocess do
  def generate_gallery_pages
    counter = 1
    photos  = Dir['assets/images/interiors/*'].
                reject { |p| p.match /thumbnail/ }.
                map    { |p| p.gsub('assets','') }
               
    photos.each do |photo|
      site = Nanoc3::Site.new('.')
      site.data_sources[0].create_item(
        nil, # content
        { # attributes
          :title => 'Interiors',
          :section => 'interiors',
          :layout => 'one',
          :photo => photo,
          :number => counter
        },
        "/interiors/#{counter}".cleaned_identifier # path
      )
      
      counter += 1
    end    
  end
  
  generate_gallery_pages
end