aboutsummaryrefslogtreecommitdiffstats
path: root/railties/lib/generators.rb
blob: c97c61507acce7330e78e30f26d91ec5b7dba442 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
activesupport_path = "#{File.dirname(__FILE__)}/../../activesupport/lib"
$:.unshift(activesupport_path) if File.directory?(activesupport_path)

begin
  require 'active_support/mini'
rescue LoadError
  require 'rubygems'
  gem 'activesupport'
  require 'active_support/mini'
end

$:.unshift(File.dirname(__FILE__))

require 'vendor/thor-0.11.5/lib/thor'
require 'generators/base'
require 'generators/named_base'

module Rails
  module Generators
    DEFAULT_ALIASES = {
      :rails => {
        :actions => '-a',
        :orm => '-o',
        :resource_controller => '-c',
        :scaffold_controller => '-c',
        :stylesheets => '-y',
        :template_engine => '-e',
        :test_framework => '-t'
      },

      :test_unit => {
        :fixture_replacement => '-r',
      },

      :plugin => {
        :generator => '-g',
        :tasks => '-r'
      }
    }

    DEFAULT_OPTIONS = {
      :active_record => {
        :migration  => true,
        :timestamps => true
      },

      :erb => {
        :form => false,
        :layout => true
      },

      :rails => {
        :force_plural => false,
        :helper => true,
        :layout => true,
        :orm => :active_record,
        :integration_tool => :test_unit,
        :performance_tool => :test_unit,
        :resource_controller => :controller,
        :scaffold_controller => :scaffold_controller,
        :singleton => false,
        :stylesheets => true,
        :template_engine => :erb,
        :test_framework => :test_unit
      },

      :test_unit => {
        :fixture => true,
        :fixture_replacement => nil
      },

      :plugin => {
        :generator => false,
        :tasks => false
      }
    }

    def self.aliases #:nodoc:
      @@aliases ||= DEFAULT_ALIASES.dup
    end

    def self.options #:nodoc:
      @@options ||= DEFAULT_OPTIONS.dup
    end

    # Get paths only from loaded rubygems. In other words, to use rspec
    # generators, you first have to ensure that rspec gem was already loaded.
    #
    def self.rubygems_generators_paths
      paths = []
      return paths unless defined?(Gem)

      Gem.loaded_specs.each do |name, spec|
        generator_path = File.join(spec.full_gem_path, "lib/generators")
        paths << generator_path if File.exist?(generator_path)
      end

      paths
    end

    # If RAILS_ROOT is defined, add vendor/gems, vendor/plugins and lib/generators
    # paths.
    #
    def self.rails_root_generators_paths
      paths = []
      if defined?(RAILS_ROOT)
        paths += Dir[File.join(RAILS_ROOT, "vendor", "gems", "gems", "*", "lib", "generators")]
        paths += Dir[File.join(RAILS_ROOT, "vendor", "plugins", "*", "lib", "generators")]
        paths << File.join(RAILS_ROOT, "lib", "generators")
      end
      paths
    end

    # 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
    #
    def self.fallbacks
      @@fallbacks ||= {}
    end

    # Remove the color from output.
    #
    def self.no_color!
      Thor::Base.shell = Thor::Shell::Basic
    end

    # Generators load paths used on lookup. The lookup happens as:
    #
    #   1) lib generators
    #   2) vendor/plugin generators
    #   3) vendor/gems generators
    #   4) ~/rails/generators
    #   5) rubygems generators
    #   6) builtin generators
    #
    # TODO Remove hardcoded paths for all, except (1).
    #
    def self.load_paths
      @@load_paths ||= begin
        paths = self.rails_root_generators_paths
        paths << File.join(Thor::Util.user_home, ".rails", "generators")
        paths += self.rubygems_generators_paths
        paths << File.expand_path(File.join(File.dirname(__FILE__), "generators"))
        paths
      end
    end
    load_paths # Cache load paths. Needed to avoid __FILE__ pointing to wrong paths.

    # Receives a namespace and tries different combinations to find a generator.
    #
    # ==== Examples
    #
    #   find_by_namespace :webrat, :rails, :integration
    #
    # Will search for the following generators:
    #
    #   "rails:generators:webrat", "webrat:generators:integration", "webrat"
    #
    # If the namespace has ":" included we consider that a absolute namespace
    # was given and the lookup above does not happen. Just the name is searched.
    #
    # Finally, it deals with one kind of shortcut:
    #
    #   find_by_namespace "test_unit:model"
    #
    # It will search for generators at:
    #
    #   "test_unit:generators:model", "test_unit:model"
    #
    def self.find_by_namespace(name, base=nil, context=nil) #:nodoc:
      name, attempts = name.to_s, []

      case name.count(':')
        when 1
          base, name = name.split(':')
          return find_by_namespace(name, base)
        when 0
          attempts << "#{base}:generators:#{name}"    if base
          attempts << "#{name}:generators:#{context}" if context
      end

      attempts << name
      unloaded = attempts - namespaces
      lookup(unloaded)

      attempts.each do |namespace|
        klass = Thor::Util.find_by_namespace(namespace)
        return klass if klass
      end

      invoke_fallbacks_for(name, base)
    end

    # 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.
    #
    def self.invoke(namespace, args=ARGV, config={})
      if klass = find_by_namespace(namespace, "rails")
        args << "--help" if klass.arguments.any? { |a| a.required? } && args.empty?
        klass.start args, config
      else
        puts "Could not find generator #{namespace}."
      end
    end

    # Show help message with available generators.
    #
    def self.help
      rails = Rails::Generators.builtin.map do |group, name|
        name if group == "rails"
      end
      rails.compact!
      rails.sort!

      puts "Please select a generator."
      puts "Builtin: #{rails.join(', ')}."

      # Load paths and remove builtin
      paths, others = load_paths.dup, []
      paths.pop

      paths.each do |path|
        tail = [ "*", "*", "*_generator.rb" ]

        until tail.empty?
          others += Dir[File.join(path, *tail)].collect do |file|
            file.split('/')[-tail.size, 2].join(':').sub(/_generator\.rb$/, '')
          end
          tail.shift
        end
      end

      others.sort!
      puts "Others: #{others.join(', ')}." unless others.empty?
    end

    protected

      # Return all defined namespaces.
      #
      def self.namespaces #:nodoc:
        Thor::Base.subclasses.map{ |klass| klass.namespace }
      end

      # Keep builtin generators in an Array[Array[group, name]].
      #
      def self.builtin #:nodoc:
        Dir[File.dirname(__FILE__) + '/generators/*/*'].collect do |file|
          file.split('/')[-2, 2]
        end
      end

      # Try callbacks for the given base.
      #
      def self.invoke_fallbacks_for(name, base)
        return nil unless base && fallbacks[base.to_sym]
        invoked_fallbacks = []

        Array(fallbacks[base.to_sym]).each do |fallback|
          next if invoked_fallbacks.include?(fallback)
          invoked_fallbacks << fallback

          klass = find_by_namespace(name, fallback)
          return klass if klass
        end

        nil
      end

      # Receives namespaces in an array and tries to find matching generators
      # in the load path. Each path is traversed into directory lookups. For
      # example:
      #
      #   rails:generators:model
      #
      # Becomes:
      #
      #   generators/rails/model/model_generator.rb
      #   generators/rails/model_generator.rb
      #   generators/model_generator.rb
      #
      def self.lookup(attempts) #:nodoc:
        attempts.each do |attempt|
          generators_path = ['.']

          paths = attempt.gsub(':generators:', ':').split(':')
          name  = "#{paths.last}_generator.rb"

          until paths.empty?
            generators_path.unshift File.join(*paths)
            paths.pop
          end

          generators_path.uniq!
          generators_path = "{#{generators_path.join(',')}}"

          self.load_paths.each do |path|
            Dir[File.join(path, generators_path, name)].each do |file|
              begin
                require file
              rescue Exception => e
                warn "[WARNING] Could not load generator at #{file.inspect}. Error: #{e.message}"
              end
            end
          end
        end
      end

  end
end