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DEFAULT_ALIASES = { rails: { actions: "-a", orm: "-o", javascripts: "-j", javascript_engine: "-je", resource_controller: "-c", scaffold_controller: "-c", stylesheets: "-y", stylesheet_engine: "-se", scaffold_stylesheet: "-ss", template_engine: "-e", test_framework: "-t" }, test_unit: { fixture_replacement: "-r", } }
 
DEFAULT_OPTIONS = { rails: { api: false, assets: true, force_plural: false, helper: true, integration_tool: nil, javascripts: true, javascript_engine: :js, orm: false, resource_controller: :controller, resource_route: true, scaffold_controller: :scaffold_controller, stylesheets: true, stylesheet_engine: :css, scaffold_stylesheet: true, system_tests: nil, test_framework: nil, template_engine: :erb } }
 
RAILS_DEV_PATH = File.expand_path("../../../../../..", __dir__)
 

We need to store the RAILS_DEV_PATH in a constant, otherwise the path can change in Ruby 1.8.7 when we FileUtils.cd.

RESERVED_NAMES = %w[application destroy plugin runner test]
 
Class Public methods
api_only!()

Configure generators for API only applications. It basically hides everything that is usually browser related, such as assets and session migration generators, and completely disable helpers and assets so generators such as scaffold won't create them.

# File railties/lib/rails/generators.rb, line 117
def api_only!
  hide_namespaces "assets", "helper", "css", "js"

  options[:rails].merge!(
    api: true,
    assets: false,
    helper: false,
    template_engine: nil
  )

  if ARGV.first == "mailer"
    options[:rails].merge!(template_engine: :erb)
  end
end
fallbacks()

Hold configured generators fallbacks. If a plugin developer wants a generator group to fallback to another group in case of missing generators, they can add a fallback.

For example, shoulda is considered a test_framework and is an extension of test_unit. However, most part of shoulda generators are similar to test_unit ones.

Shoulda then can tell generators to search for test_unit generators when some of them are not available by adding a fallback:

Rails::Generators.fallbacks[:shoulda] = :test_unit
# File railties/lib/rails/generators.rb, line 109
def fallbacks
  @fallbacks ||= {}
end
help(command = "generate")

Show help message with available generators.

# File railties/lib/rails/generators.rb, line 180
def help(command = "generate")
  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_generators
end
hidden_namespaces()

Returns an array of generator namespaces that are hidden. Generator namespaces may be hidden for a variety of reasons. Some are aliased such as “rails:migration” and can be invoked with the shorter “migration”, others are private to other generators such as “css:scaffold”.

# File railties/lib/rails/generators.rb, line 142
def hidden_namespaces
  @hidden_namespaces ||= begin
    orm      = options[:rails][:orm]
    test     = options[:rails][:test_framework]
    template = options[:rails][:template_engine]
    css      = options[:rails][:stylesheet_engine]

    [
      "rails",
      "resource_route",
      "#{orm}:migration",
      "#{orm}:model",
      "#{test}:controller",
      "#{test}:helper",
      "#{test}:integration",
      "#{test}:system",
      "#{test}:mailer",
      "#{test}:model",
      "#{test}:scaffold",
      "#{test}:view",
      "#{test}:job",
      "#{template}:controller",
      "#{template}:scaffold",
      "#{template}:mailer",
      "#{css}:scaffold",
      "#{css}:assets",
      "css:assets",
      "css:scaffold"
    ]
  end
end
hide_namespace(*namespaces)
Alias for: hide_namespaces
hide_namespaces(*namespaces)
Also aliased as: hide_namespace
# File railties/lib/rails/generators.rb, line 174
def hide_namespaces(*namespaces)
  hidden_namespaces.concat(namespaces)
end
invoke(namespace, args = ARGV, config = {})

Receives a namespace, arguments and the behavior to invoke the generator. It's used as the default entry point for generate, destroy and update commands.

# File railties/lib/rails/generators.rb, line 267
def invoke(namespace, args = ARGV, config = {})
  names = namespace.to_s.split(":")
  if klass = find_by_namespace(names.pop, names.any? && names.join(":"))
    args << "--help" if args.empty? && klass.arguments.any?(&:required?)
    klass.start(args, config)
  else
    options     = sorted_groups.flat_map(&:last)
    suggestions = options.sort_by { |suggested| levenshtein_distance(namespace.to_s, suggested) }.first(3)
    msg =  "Could not find generator '#{namespace}'. ".dup
    msg << "Maybe you meant #{ suggestions.map { |s| "'#{s}'" }.to_sentence(last_word_connector: " or ", locale: :en) }\n"
    msg << "Run `rails generate --help` for more options."
    puts msg
  end
end
no_color!()

Remove the color from output.

# File railties/lib/rails/generators.rb, line 133
def no_color!
  Thor::Base.shell = Thor::Shell::Basic
end
print_generators()
# File railties/lib/rails/generators.rb, line 201
def print_generators
  sorted_groups.each { |b, n| print_list(b, n) }
end
public_namespaces()
# File railties/lib/rails/generators.rb, line 196
def public_namespaces
  lookup!
  subclasses.map(&:namespace)
end
sorted_groups()
# File railties/lib/rails/generators.rb, line 205
def sorted_groups
  namespaces = public_namespaces
  namespaces.sort!

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

  rails = groups.delete("rails")
  rails.map! { |n| n.sub(/^rails:/, "") }
  rails.delete("app")
  rails.delete("plugin")
  rails.delete("encrypted_secrets")

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

  [[ "rails", rails ]] + groups.sort.to_a
end
Class Private methods
command_type()
# File railties/lib/rails/generators.rb, line 305
def command_type # :doc:
  @command_type ||= "generator"
end
file_lookup_paths()
# File railties/lib/rails/generators.rb, line 313
def file_lookup_paths # :doc:
  @file_lookup_paths ||= [ "{#{lookup_paths.join(',')}}", "**", "*_generator.rb" ]
end
lookup_paths()
# File railties/lib/rails/generators.rb, line 309
def lookup_paths # :doc:
  @lookup_paths ||= %w( rails/generators generators )
end
print_list(base, namespaces)
# File railties/lib/rails/generators.rb, line 284
def print_list(base, namespaces) # :doc:
  namespaces = namespaces.reject { |n| hidden_namespaces.include?(n) }
  super
end