2 files changed, 100 insertions, 0 deletions
diff --git a/lib/bundler/runtime/dependency.rb b/lib/bundler/runtime/dependency.rb
new file mode 100644
index 0000000000..75d15a27fa
--- /dev/null
+++ b/lib/bundler/runtime/dependency.rb
@@ -0,0 +1,56 @@
+module Bundler
+  class InvalidEnvironmentName < StandardError; end
+
+  class Dependency
+    attr_reader :name, :version, :require_as, :only, :except
+
+    def initialize(name, options = {}, &block)
+      options.each do |k, v|
+        options[k.to_s] = v
+      end
+
+      @name       = name
+      @version    = options["version"] || ">= 0"
+      @require_as = Array(options["require_as"] || name)
+      @only       = Array(options["only"]).map {|e| e.to_s } if options["only"]
+      @except     = Array(options["except"]).map {|e| e.to_s } if options["except"]
+      @block      = block
+
+      if (@only && @only.include?("rubygems")) || (@except && @except.include?("rubygems"))
+        raise InvalidEnvironmentName, "'rubygems' is not a valid environment name"
+      end
+    end
+
+    def in?(environment)
+      environment = environment.to_s
+
+      return false unless !@only || @only.include?(environment)
+      return false if @except && @except.include?(environment)
+      true
+    end
+
+    def to_s
+      to_gem_dependency.to_s
+    end
+
+    def require(environment)
+      return unless in?(environment)
+
+      @require_as.each do |file|
+        super(file)
+      end
+
+      @block.call if @block
+    end
+
+    def to_gem_dependency
+      @gem_dep ||= Gem::Dependency.new(name, version)
+    end
+
+    def ==(o)
+      [name, version, require_as, only, except] ==
+        [o.name, o.version, o.require_as, o.only, o.except]
+    end
+
+  end
+end
diff --git a/lib/bundler/runtime/dsl.rb b/lib/bundler/runtime/dsl.rb
new file mode 100644
index 0000000000..436867b4db
--- /dev/null
+++ b/lib/bundler/runtime/dsl.rb
@@ -0,0 +1,44 @@
+module Bundler
+  class ManifestFileNotFound < StandardError; end
+
+  def self.require(environment = nil)
+    ManifestBuilder.run(@gemfile, environment || :default)
+  end
+
+  class ManifestBuilder
+    def self.run(gemfile, environment)
+      unless File.exist?(gemfile)
+        raise ManifestFileNotFound, "#{gemfile.inspect} does not exist"
+      end
+
+      builder = new(environment)
+      builder.instance_eval(File.read(gemfile))
+      builder
+    end
+
+    def initialize(environment)
+      @environment = environment
+    end
+
+    def bundle_path(*) ; end
+
+    def bin_path(*) ; end
+
+    def disable_rubygems(*) ; end
+
+    def disable_system_gems(*) ; end
+
+    def source(*) ; end
+
+    def clear_sources(*) ; end
+
+    def gem(name, *args, &blk)
+      options = args.last.is_a?(Hash) ? args.pop : {}
+      version = args.last
+
+      dep = Dependency.new(name, options.merge(:version => version), &blk)
+      dep.require(@environment)
+      dep
+    end
+  end
+end
+\ No newline at end of file