Creating executable rails 3 generators

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

Aha! Require the app generator and then start it :slight_smile:

then in framework.task


desc “Applies the template supplied by LOCATION=/path/to/template”
task :template do

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

Here the utility method invoke_from_app_generator requires the app
generator and invokes a specific method.
Specific tasks then use this utility method to execute specific parts
of the app generator as needed…

and in railties3.0pre.gemspec


s.default_executable = %q{rails}
s.executables = [“rails”]

Defines the executable rails found in the bin folder

So I assume, to make a gem executable, you simply need to

  1. define the executables in the gemspec
  2. put an executable in the bin folder, fx bin/my_executable
  3. have that executable require a generator and then call start on the
    generator
  4. install the gem
  5. run the executable passing in any defined arguments as per the
    generator

Commens, ideas, suggestions?

Thanks!

Kristian

It almost works… 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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