class Bundler::SpecSet

def for(dependencies, skip = [], check = false, match_current_platform = false)
  handled, deps, specs = {}, dependencies.dup, []
  skip << 'bundler'
  until deps.empty?
    dep = deps.shift
    next if handled[dep] || skip.include?(dep.name)
    spec = lookup[dep.name].find do |s|
      match_current_platform ?
        Gem::Platform.match(s.platform) :
        s.match_platform(dep.__platform)
    end
    handled[dep] = true
    if spec
      specs << spec
      spec.dependencies.each do |d|
        next if d.type == :development
        d = DepProxy.new(d, dep.__platform) unless match_current_platform
        deps << d
      end
    elsif check
      return false
    end
  end
  if spec = lookup['bundler'].first
    specs << spec
  end
  check ? true : SpecSet.new(specs)
end