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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, test_framework: false, template_engine: :erb } }
 
RAILS_DEV_PATH = File.expand_path("../../../../../..", File.dirname(__FILE__))
 

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 views, helpers and assets so generators such as scaffold won't create them.

# File railties/lib/rails/generators.rb, line 110
def self.api_only!
  hide_namespaces "assets", "helper", "css", "js"

  options[:rails].merge!(
    api: true,
    assets: false,
    helper: false,
    template_engine: nil
  )
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 102
def self.fallbacks
  @fallbacks ||= {}
end
help(command = 'generate')

Show help message with available generators.

# File railties/lib/rails/generators.rb, line 230
def self.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 192
def self.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}:mailer",
      "#{test}:model",
      "#{test}:scaffold",
      "#{test}:view",
      "#{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 223
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 172
def self.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}'. "
    msg << "Maybe you meant #{ suggestions.map {|s| "'#{s}'"}.to_sentence(last_word_connector: " or ") }\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 122
def self.no_color!
  Thor::Base.shell = Thor::Shell::Basic
end
print_generators()
# File railties/lib/rails/generators.rb, line 251
def self.print_generators
  sorted_groups.each { |b, n| print_list(b, n) }
end
public_namespaces()
# File railties/lib/rails/generators.rb, line 246
def self.public_namespaces
  lookup!
  subclasses.map(&:namespace)
end
sorted_groups()
# File railties/lib/rails/generators.rb, line 255
def self.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")

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

  [["rails", rails]] + groups.sort.to_a
end
subclasses()

Track all generators subclasses.

# File railties/lib/rails/generators.rb, line 127
def self.subclasses
  @subclasses ||= []
end
Class Protected methods
levenshtein_distance(str1, str2)

This code is based directly on the Text gem implementation Returns a value representing the “cost” of transforming str1 into str2

# File railties/lib/rails/generators.rb, line 277
def self.levenshtein_distance str1, str2
  s = str1
  t = str2
  n = s.length
  m = t.length

  return m if (0 == n)
  return n if (0 == m)

  d = (0..m).to_a
  x = nil

  # avoid duplicating an enumerable object in the loop
  str2_codepoint_enumerable = str2.each_codepoint

  str1.each_codepoint.with_index do |char1, i|
    e = i+1

    str2_codepoint_enumerable.with_index do |char2, j|
      cost = (char1 == char2) ? 0 : 1
      x = [
           d[j+1] + 1, # insertion
           e + 1,      # deletion
           d[j] + cost # substitution
          ].min
      d[j] = e
      e = x
    end

    d[m] = x
  end

  x
end