class Bundler::Runtime

def cache
  FileUtils.mkdir_p(cache_path) unless File.exists?(cache_path)
  Bundler.ui.info "Updating .gem files in vendor/cache"
  specs.each do |spec|
    next if spec.name == 'bundler'
    spec.source.cache(spec) if spec.source.respond_to?(:cache)
  end
  prune_cache unless Bundler.settings[:no_prune]
end

def cache_path
  root.join("vendor/cache")
end

def dependencies_for(*groups)
  if groups.empty?
    dependencies
  else
    dependencies.select { |d| (groups & d.groups).any? }
  end
end

def prune_cache
  FileUtils.mkdir_p(cache_path) unless File.exists?(cache_path)
  resolve = @definition.resolve
  cached  = Dir["#{cache_path}/*.gem"]
  cached = cached.delete_if do |path|
    spec = Bundler.rubygems.spec_from_gem path
    resolve.any? do |s|
      s.name == spec.name && s.version == spec.version && !s.source.is_a?(Bundler::Source::Git)
    end
  end
  if cached.any?
    Bundler.ui.info "Removing outdated .gem files from vendor/cache"
    cached.each do |path|
      Bundler.ui.info "  * #{File.basename(path)}"
      File.delete(path)
    end
  end
end

def require(*groups)
  groups.map! { |g| g.to_sym }
  groups = [:default] if groups.empty?
  @definition.dependencies.each do |dep|
    # Skip the dependency if it is not in any of the requested
    # groups
    next unless ((dep.groups & groups).any? && dep.current_platform?)
    required_file = nil
    begin
      # Loop through all the specified autorequires for the
      # dependency. If there are none, use the dependency's name
      # as the autorequire.
      Array(dep.autorequire || dep.name).each do |file|
        required_file = file
        Kernel.require file
      end
    rescue LoadError => e
      REGEXPS.find { |r| r =~ e.message }
      raise if dep.autorequire || $1 != required_file
    end
  end
end

def setup(*groups)
  # Has to happen first
  clean_load_path
  specs = groups.any? ? @definition.specs_for(groups) : requested_specs
  setup_environment
  Bundler.rubygems.replace_entrypoints(specs)
  # Activate the specs
  specs.each do |spec|
    unless spec.loaded_from
      raise GemNotFound, "#{spec.full_name} is missing. Run `bundle` to get it."
    end
    if activated_spec = Bundler.rubygems.loaded_specs(spec.name) and activated_spec.version != spec.version
      e = Gem::LoadError.new "You have already activated #{activated_spec.name} #{activated_spec.version}, " \
                             "but your Gemfile requires #{spec.name} #{spec.version}. Consider using bundle exec."
      e.name = spec.name
      if e.respond_to?(:requirement=)
        e.requirement = Gem::Requirement.new(spec.version.to_s)
      else
        e.version_requirement = Gem::Requirement.new(spec.version.to_s)
      end
      raise e
    end
    Bundler.rubygems.mark_loaded(spec)
    load_paths = spec.load_paths.reject {|path| $LOAD_PATH.include?(path)}
    $LOAD_PATH.unshift(*load_paths)
  end
  lock
  self
end

def setup_environment
  begin
    ENV["BUNDLE_BIN_PATH"] = Bundler.rubygems.bin_path("bundler", "bundle", VERSION)
  rescue Gem::GemNotFoundException
    ENV["BUNDLE_BIN_PATH"] = File.expand_path("../../../bin/bundle", __FILE__)
  end
  # Set PATH
  paths = (ENV["PATH"] || "").split(File::PATH_SEPARATOR)
  paths.unshift "#{Bundler.bundle_path}/bin"
  ENV["PATH"] = paths.uniq.join(File::PATH_SEPARATOR)
  # Set BUNDLE_GEMFILE
  ENV["BUNDLE_GEMFILE"] = default_gemfile.to_s
  # Set RUBYOPT
  rubyopt = [ENV["RUBYOPT"]].compact
  if rubyopt.empty? || rubyopt.first !~ /-rbundler\/setup/
    rubyopt.unshift "-rbundler/setup"
    rubyopt.unshift "-I#{File.expand_path('../..', __FILE__)}"
    ENV["RUBYOPT"] = rubyopt.join(' ')
  end
end