Add support for bundle install --standalone, which will allow a bundl…

…e to work without rubygems or bundler at runtime. This is useful for packaging up an app using something like warbler, rawr, or as a .app using MacRuby

lib/bundler/cli.rb

@@ -154,6 +154,8 @@ def check
       "Install using defaults tuned for deployment environments"
     method_option "production", :type => :boolean, :banner =>
       "Deprecated, please use --deployment instead"
+    method_option "standalone", :type => :array, :lazy_default => [], :banner =>
+      "Make a bundle that can work without the Bundler runtime"
     def install
       opts = options.dup
       opts[:without] ||= []
@@ -210,8 +212,13 @@ def install
       Bundler.settings[:path] = "vendor/bundle" if opts[:deployment]
       Bundler.settings[:path] = opts[:path] if opts[:path]
       Bundler.settings[:bin] = opts["binstubs"] if opts[:binstubs]
+      Bundler.settings[:path]   = nil if opts[:system]
+      Bundler.settings[:path]   = "vendor/bundle" if opts[:deployment]
+      Bundler.settings[:path]   = opts[:path] if opts[:path]
+      Bundler.settings[:path] ||= "bundle" if opts[:standalone]
+      Bundler.settings[:bin]    = opts["binstubs"] if opts[:binstubs]
       Bundler.settings[:disable_shared_gems] = '1' if Bundler.settings[:path]
-      Bundler.settings.without = opts[:without] unless opts[:without].empty?
+      Bundler.settings.without  = opts[:without] unless opts[:without].empty?
       Bundler.ui.be_quiet! if opts[:quiet]
 
       Installer.install(Bundler.root, Bundler.definition, opts)

lib/bundler/installer.rb

@@ -64,6 +64,7 @@ def run(options)
       end
 
       lock
+      generate_standalone(options[:standalone]) if options[:standalone]
     end
 
   private
@@ -81,5 +82,36 @@ def generate_bundler_executable_stubs(spec)
         end
       end
     end
+
+    def generate_standalone(groups)
+      path = Bundler.settings[:path]
+      bundler_path = File.join(path, "bundler")
+      FileUtils.mkdir_p(bundler_path)
+
+      paths = []
+
+      if groups.empty?
+        specs = Bundler.definition.requested_specs
+      else
+        specs = Bundler.definition.specs_for groups.map { |g| g.to_sym }
+      end
+
+      specs.each do |spec|
+        next if spec.name == "bundler"
+
+        spec.require_paths.each do |path|
+          full_path = File.join(spec.full_gem_path, path)
+          paths << Pathname.new(full_path).relative_path_from(Bundler.root)
+        end
+      end
+
+      File.open File.join(bundler_path, "setup.rb"), "w" do |file|
+        lines = paths.map do |path|
+          %{$:.unshift "#{path}"}
+        end
+
+        file.puts lines.join("\n")
+      end
+    end
   end
 end

spec/install/gems/standalone_spec.rb

@@ -0,0 +1,162 @@
+require "spec_helper"
+
+describe "bundle install --standalone" do
+  describe "with simple gems" do
+    before do
+      install_gemfile <<-G, :standalone => true
+        source "file://#{gem_repo1}"
+        gem "rails"
+      G
+    end
+
+    it "still makes the gems available to normal bundler" do
+      should_be_installed "actionpack 2.3.2", "rails 2.3.2"
+    end
+
+    it "generates a bundle/bundler/setup.rb" do
+      bundled_app("bundle/bundler/setup.rb").should exist
+    end
+
+    it "makes the gems available without bundler" do
+      ruby <<-RUBY, :no_lib => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        puts ACTIONPACK
+      RUBY
+
+      out.should == "2.3.2"
+    end
+
+    it "works on a different system" do
+      FileUtils.mv(bundled_app, "#{bundled_app}2")
+      Dir.chdir("#{bundled_app}2")
+
+      ruby <<-RUBY, :no_lib => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        puts ACTIONPACK
+      RUBY
+
+      out.should == "2.3.2"
+    end
+  end
+
+  describe "with a combination of gems and git repos" do
+    before do
+      build_git "devise", "1.0"
+
+      install_gemfile <<-G, :standalone => true
+        source "file://#{gem_repo1}"
+        gem "rails"
+        gem "devise", :git => "#{lib_path('devise-1.0')}"
+      G
+    end
+
+    it "still makes the gems available to normal bundler" do
+      should_be_installed "actionpack 2.3.2", "rails 2.3.2", "devise 1.0"
+    end
+
+    it "generates a bundle/bundler/setup.rb" do
+      bundled_app("bundle/bundler/setup.rb").should exist
+    end
+
+    it "makes the gems available without bundler" do
+      ruby <<-RUBY, :no_lib => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "devise"
+        require "actionpack"
+        puts DEVISE
+        puts ACTIONPACK
+      RUBY
+
+      out.should == "1.0\n2.3.2"
+    end
+  end
+
+  describe "with groups" do
+    before do
+      build_git "devise", "1.0"
+
+      install_gemfile <<-G, :standalone => true
+        source "file://#{gem_repo1}"
+        gem "rails"
+
+        group :test do
+          gem "rspec"
+          gem "rack-test"
+        end
+      G
+    end
+
+    it "makes the gems available without bundler" do
+      ruby <<-RUBY, :no_lib => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        require "spec"
+        require "rack/test"
+        puts ACTIONPACK
+        puts SPEC
+        puts RACK_TEST
+      RUBY
+
+      out.should == "2.3.2\n1.2.7\n1.0"
+    end
+
+    it "allows creating a standalone file with limited groups" do
+      bundle "install --standalone default"
+
+      ruby <<-RUBY, :no_lib => true, :expect_err => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        puts ACTIONPACK
+        require "spec"
+      RUBY
+
+      out.should == "2.3.2"
+      err.should =~ /no such file to load.*spec/
+    end
+
+    it "allows --without to limit the groups used in a standalone" do
+      bundle "install --standalone --without test"
+
+      ruby <<-RUBY, :no_lib => true, :expect_err => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        puts ACTIONPACK
+        require "spec"
+      RUBY
+
+      out.should == "2.3.2"
+      err.should =~ /no such file to load.*spec/
+    end
+
+    it "allows remembered --without to limit the groups used in a standalone" do
+      bundle "install --without test"
+      bundle "install --standalone"
+
+      ruby <<-RUBY, :no_lib => true, :expect_err => true
+        $:.unshift File.expand_path("bundle")
+        require "bundler/setup"
+
+        require "actionpack"
+        puts ACTIONPACK
+        require "spec"
+      RUBY
+
+      out.should == "2.3.2"
+      err.should =~ /no such file to load.*spec/
+    end
+  end
+end

spec/support/helpers.rb

@@ -68,7 +68,8 @@ def ruby(ruby, options = {})
       expect_err = options.delete(:expect_err)
       env = (options.delete(:env) || {}).map{|k,v| "#{k}='#{v}' "}.join
       ruby.gsub!(/["`\$]/) {|m| "\\#{m}" }
-      sys_exec(%{#{env}#{Gem.ruby} -I#{lib} -e "#{ruby}"}, expect_err)
+      lib_option = options[:no_lib] ? "" : " -I#{lib}"
+      sys_exec(%{#{env}#{Gem.ruby}#{lib_option} -e "#{ruby}"}, expect_err)
     end
 
     def gembin(cmd)