Moving in thor

.gitignore

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+.DS_Store
+tmp
+pkg

LICENSE

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+Copyright (c) 2009 Engine Yard
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Rakefile

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+$:.unshift File.expand_path("../lib", __FILE__)
+
+require 'rubygems'
+require 'rubygems/specification'
+require 'bubble'
+
+spec = Gem::Specification.new do |s|
+  s.name     = "bubble"
+  s.version  = Bubble::VERSION
+  s.authors  = ["Carl Lerche", "Yehuda Katz"]
+  s.email    = ["carlhuda@engineyard.com"]
+  s.homepage = "http://github.com/carlhuda/bubble"
+  s.summary  = "Bubbles are fun"
+
+  s.platform = Gem::Platform::RUBY
+
+  s.required_rubygems_version = ">= 1.3.5"
+
+  s.files        = Dir.glob("{bin,lib}/**/*") + %w(LICENSE README)
+  s.executables  = ['bbl']
+  s.require_path = 'lib'
+end
+
+begin
+  require 'spec/rake/spectask'
+rescue LoadError
+  task :spec do
+    $stderr.puts '`gem install rspec` to run specs'
+  end
+else
+  desc "Run specs"
+  Spec::Rake::SpecTask.new do |t|
+    t.spec_files = FileList['spec/**/*_spec.rb']
+    t.spec_opts  = %w(-fs --color)
+    t.warning    = true
+  end
+end
+
+desc "create a gemspec file"
+task :gemspec do
+  File.open("#{spec.name}.gemspec", 'w') do |file|
+    file.puts spec.to_ruby
+  end
+end
+
+task :default => :spec

lib/bubble.rb

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+module Bubble
+  VERSION = "0.9.0.pre"
+
+  autoload :Definition,  'bubble/definition'
+  autoload :Dependency,  'bubble/dependency'
+  autoload :Dsl,         'bubble/dsl'
+  autoload :Environment, 'bubble/environment'
+
+  class GemfileNotFound < StandardError; end
+  class GemNotFound     < StandardError; end
+  class VersionConflict < StandardError; end
+
+  def self.load(gemfile = nil)
+    Environment.new(definition(gemfile))
+  end
+
+  def self.definition(gemfile = nil)
+    Definition.from_gemfile(gemfile)
+  end
+end

lib/bubble/definition.rb

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+module Bubble
+  class Definition
+    def self.from_gemfile(gemfile)
+      gemfile = Pathname.new(gemfile || default_gemfile).expand_path
+
+      unless gemfile.file?
+        raise GemfileNotFound, "`#{gemfile}` not found"
+      end
+
+      definition = new
+      Dsl.evaluate(gemfile, definition)
+      definition
+    end
+
+    def self.default_gemfile
+      current = Pathname.new(Dir.pwd)
+
+      until current.root?
+        filename = current.join("Gemfile")
+        return filename if filename.exist?
+        current = current.parent
+      end
+
+      raise GemfileNotFound, "the default Gemfile was not found"
+    end
+
+    attr_reader :dependencies
+
+    def initialize
+      @dependencies = []
+    end
+  end
+end

lib/bubble/dependency.rb

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+require 'rubygems/dependency'
+
+module Bubble
+  class Dependency < Gem::Dependency
+    def initialize(name, version, options = {}, &blk)
+      options.each do |k, v|
+        options[k.to_s] = v
+      end
+
+      super(name, version)
+    end
+  end
+end

lib/bubble/dsl.rb

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+module Bubble
+  class Dsl
+    def self.evaluate(gemfile, definition)
+      builder = new(definition)
+      builder.instance_eval(File.read(gemfile.to_s), gemfile.to_s, 1)
+      definition
+    end
+
+    def initialize(definition)
+      @definition = definition
+    end
+
+    def gem(name, *args)
+      options = Hash === args.last ? args.pop : {}
+      version = args.last || ">= 0"
+
+      @definition.dependencies << Dependency.new(name, version, options)
+    end
+  end
+end

lib/bubble/environment.rb

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+module Bubble
+  class Environment
+    def initialize(definition)
+      @definition = definition
+    end
+
+    def dependencies
+      @definition.dependencies
+    end
+
+    def gems
+      []
+    end
+  end
+end