help

# File railties/lib/rails/generators.rb, line 206
    def self.help(command = 'generate')
      lookup!

      namespaces = subclasses.map{ |k| k.namespace }
      namespaces.sort!

      groups = Hash.new { |h,k| h[k] = [] }
      namespaces.each do |namespace|
        base = namespace.split(':').first
        groups[base] << namespace
      end

      puts "Usage: rails #{command} GENERATOR [args] [options]"
      puts
      puts "General options:"
      puts "  -h, [--help]     # Print generator's options and usage"
      puts "  -p, [--pretend]  # Run but do not make any changes"
      puts "  -f, [--force]    # Overwrite files that already exist"
      puts "  -s, [--skip]     # Skip files that already exist"
      puts "  -q, [--quiet]    # Suppress status output"
      puts
      puts "Please choose a generator below."
      puts

      # Print Rails defaults first.
      rails = groups.delete("rails")
      rails.map! { |n| n.sub(/^rails:/, '') }
      rails.delete("app")
      print_list("rails", rails)

      hidden_namespaces.each {|n| groups.delete(n.to_s) }

      groups.sort.each { |b, n| print_list(b, n) }
    end