Rails core - Jan 2010 - Creating a rails 3 app generator executable using thor

For inspiration I have been looking into rails 3.0pre

I found this in the file bin/rails
--
...
require ''rails/generators''
require ''generators/rails/app/app_generator''

Rails::Generators::AppGenerator.start
--

framework.task
--
...
  desc "Applies the template supplied by LOCATION=/path/to/template"
  task :template do
    template = ENV["LOCATION"]
    template = File.expand_path(template) if template !~ %r{\A[A-Za-z]
[A-Za-z0-9+\-\.]*://}

    require ''rails/generators''
    require ''generators/rails/app/app_generator''
    generator = Rails::Generators::AppGenerator.new [ Rails.root ],
{}, :destination_root => Rails.root
    generator.apply template, :verbose => false
  end

  namespace :update do
    def invoke_from_app_generator(method)
      require ''rails/generators''
      require ''generators/rails/app/app_generator''

      generator = Rails::Generators::AppGenerator.new ["rails"],
{ :with_dispatchers => true },
                                                      :destination_root
=> Rails.root
      generator.invoke(method)
    end

    desc "Update config/boot.rb from your current rails install"
    task :configs do
      invoke_from_app_generator :create_boot_file
      invoke_from_app_generator :create_config_files
    end

    desc "Update Prototype javascripts from your current rails
install"
    task :javascripts do
      invoke_from_app_generator :create_prototype_files
    end

    desc "Add new scripts to the application script/ directory"
    task :scripts do
      invoke_from_app_generator :create_script_files
    end
--

and in railties3.0pre.gemspec
--
..
  s.default_executable = %q{rails}
  s.executables = ["rails"]
..
--

So I assume, to make a gem executable, you simply need to define the
executables, put an executable in the bin folder, fx bin/my_executable
and have that executable require and then call start on the
application generator?

Thanks!

Kristian

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except I run into the following issue

module Nifty
  module Generators
    class ScaffoldGenerator < Base
...
      def initialize(*args, &block)
        super

        args_for_c_m.each do |arg|
          if arg == ''!''
            options[:invert] = true    <<<<<< line 53
...
        if @model_attributes.empty?
          options[:skip_model] = true  <<<<<<<<

end
--
$ nifty_scaffold blip
/opt/local/lib/ruby/gems/1.9.1/gems/railties-3.0.pre/lib/rails/vendor/
thor-0.12.3/lib/thor/core_ext/hash_with_indifferent_access.rb:26:in `
[]
='': can''t modify frozen hash (RuntimeError)
        from /opt/local/lib/ruby/gems/1.9.1/gems/railties-3.0.pre/lib/
rails/
vendor/thor-0.12.3/lib/thor/core_ext/hash_with_indifferent_access.rb:
26:in `[]=''
        from /opt/local/lib/ruby/gems/1.9.1/gems/
very_nifty_generators-0.1.2/
lib/generators/nifty/scaffold/scaffold_generator.rb:53:in `initialize''
--

Is there a nice way to fix this? Do I have to create a non-frozen
custom options collection or someone has a better idea?

Kristian

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I fixed it with a pretty ugly hack :P

      def initialize(*args, &block)
        super

        @my_options ||= {}
...
          if arg == ''!''
            @my_options[:invert] = true
...
        if @model_attributes.empty?
          @my_options[:skip_model] = true

      def do_skip_model?
        options.skip_model? || @my_options[:skip_model]
      end

      def do_invert?
        options.invert? || @my_options[:invert]
      end


      def create_model
        unless do_skip_model?
...

I''m sure there must be better ways around this!

I have also managed to create executables for all my generators!

http://github.com/kristianmandrup/very_nifty_generators

Enjoy!

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