# Load helpers in helpers/
module Middleman::CoreExtensions::ExternalHelpers
  
  # Setup extension
  class << self
    
    # once registered
    def registered(app)
      # Setup a default helpers paths
      app.set :helpers_dir, "helpers"
      app.set :helpers_filename_glob, "**/*_helper.rb"
      app.set :helpers_filename_to_module_name_proc, Proc.new { |filename|
        basename = File.basename(filename, File.extname(filename))
        basename.camelcase
      }
      
      # After config
      app.after_configuration do
        helpers_path = File.expand_path(helpers_dir, root)
        next unless File.exists?(helpers_path)
        
        Dir[File.join(helpers_path, helpers_filename_glob)].each do |filename|
          module_name = helpers_filename_to_module_name_proc.call(filename)
          next unless module_name
          
          require filename
          next unless Object.const_defined?(module_name.to_sym)
          
          helpers Object.const_get(module_name.to_sym)
        end
      end
    end
    alias :included :registered
  end
end