application and plugin generation run bundle check unless --skip-gemfile

The purpose of this feature is that the user knows whether
dependencies are satisfied. In particular, if they are not
he will be warned upfront, rather than finding out himself
in an abrupt way by trying to run something.

railties/CHANGELOG

@@ -1,5 +1,7 @@
 *Rails 3.1.0 (unreleased)*
 
+* Application and plugin generation run bundle check unless --skip-gemfile. [fxn]
+
 * Fixed database tasks for jdbc* adapters #jruby
 
   [Rashmi Yadav]

railties/lib/rails/generators/app_base.rb

@@ -184,9 +184,20 @@ module Rails
         "gem '#{options[:javascript]}-rails'" unless options[:skip_javascript]
       end
 
-      def bundle_if_dev_or_edge
-        bundle_command = File.basename(Thor::Util.ruby_command).sub(/ruby/, 'bundle')
-        run "#{bundle_command} install" if dev_or_edge?
+      def bundle_command(command)
+        # We use backticks and #print here instead of vanilla #system because it
+        # is easier to silence stdout in the existing test suite this way. The
+        # end-user gets the bundler commands called anyway.
+        #
+        # Thanks to James Tucker for the Gem tricks involved in this call.
+        print `"#{Gem.ruby}" -rubygems "#{Gem.bin_path('bundler', 'bundle')}" #{command}`
+      end
+
+      def run_bundle
+        unless options[:skip_gemfile]
+          command = dev_or_edge? ? 'install' : 'check'
+          bundle_command(command)
+        end
       end
 
       def dev_or_edge?

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -225,7 +225,7 @@ module Rails
         build(:leftovers)
       end
 
-      public_task :apply_rails_template, :bundle_if_dev_or_edge
+      public_task :apply_rails_template, :run_bundle
 
     protected
 

railties/lib/rails/generators/rails/plugin_new/plugin_new_generator.rb

@@ -209,7 +209,7 @@ task :default => :test
         build(:leftovers)
       end
 
-      public_task :apply_rails_template, :bundle_if_dev_or_edge
+      public_task :apply_rails_template, :run_bundle
 
     protected
 

railties/test/generators/plugin_new_generator_test.rb

@@ -119,17 +119,17 @@ class PluginNewGeneratorTest < Rails::Generators::TestCase
     assert_match(/It works from file!/, run_generator([destination_root, "-m", "lib/template.rb"]))
   end
 
-  def test_ensure_that_tests_works
+  def test_ensure_that_tests_work
     run_generator
     FileUtils.cd destination_root
-    `bundle install`
+    `bundle install` # use backticks to silence stdout
     assert_match(/1 tests, 1 assertions, 0 failures, 0 errors/, `bundle exec rake test`)
   end
 
   def test_ensure_that_tests_works_in_full_mode
     run_generator [destination_root, "--full", "--skip_active_record"]
     FileUtils.cd destination_root
-    `bundle install`
+    `bundle install` # use backticks to silence stdout
     assert_match(/1 tests, 1 assertions, 0 failures, 0 errors/, `bundle exec rake test`)
   end
 

railties/test/generators/shared_generator_tests.rb

@@ -6,7 +6,6 @@ module SharedGeneratorTests
     Rails.application = TestApp::Application
     super
     Rails::Generators::AppGenerator.instance_variable_set('@desc', nil)
-    @bundle_command = File.basename(Thor::Util.ruby_command).sub(/ruby/, 'bundle')
 
     Kernel::silence_warnings do
       Thor::Base.shell.send(:attr_accessor, :always_force)
@@ -24,7 +23,12 @@ module SharedGeneratorTests
   def test_skeleton_is_created
     run_generator
 
-    default_files.each{ |path| assert_file path }
+    default_files.each { |path| assert_file path }
+  end
+
+  def test_generation_runs_bundle_check
+    generator([destination_root]).expects(:bundle_command).with('check').once
+    silence(:stdout) { generator.invoke_all }
   end
 
   def test_plugin_new_generate_pretend
@@ -112,17 +116,23 @@ module SharedGeneratorTests
   end
 
   def test_dev_option
-    generator([destination_root], :dev => true).expects(:run).with("#{@bundle_command} install")
-    silence(:stdout){ generator.invoke_all }
+    generator([destination_root], :dev => true).expects(:bundle_command).with('install').once
+    silence(:stdout) { generator.invoke_all }
     rails_path = File.expand_path('../../..', Rails.root)
     assert_file 'Gemfile', /^gem\s+["']rails["'],\s+:path\s+=>\s+["']#{Regexp.escape(rails_path)}["']$/
   end
 
   def test_edge_option
-    generator([destination_root], :edge => true).expects(:run).with("#{@bundle_command} install")
-    silence(:stdout){ generator.invoke_all }
+    generator([destination_root], :edge => true).expects(:bundle_command).with('install').once
+    silence(:stdout) { generator.invoke_all }
     assert_file 'Gemfile', %r{^gem\s+["']rails["'],\s+:git\s+=>\s+["']#{Regexp.escape("git://github.com/rails/rails.git")}["']$}
   end
+
+  def test_skip_gemfile
+    generator([destination_root], :skip_gemfile => true).expects(:bundle_command).never
+    silence(:stdout) { generator.invoke_all }
+    assert_no_file 'Gemfile'
+  end
 end
 
 module SharedCustomGeneratorTests
@@ -130,7 +140,6 @@ module SharedCustomGeneratorTests
     Rails.application = TestApp::Application
     super
     Rails::Generators::AppGenerator.instance_variable_set('@desc', nil)
-    @bundle_command = File.basename(Thor::Util.ruby_command).sub(/ruby/, 'bundle')
   end
 
   def teardown