module Bundler::SharedHelpers

def clean_load_path
  # handle 1.9 where system gems are always on the load path
  if defined?(::Gem)
    me = File.expand_path("../../", __FILE__)
    $LOAD_PATH.reject! do |p|
      next if File.expand_path(p) =~ /^#{Regexp.escape(me)}/
      p != File.dirname(__FILE__) &&
        Bundler.rubygems.gem_path.any?{|gp| p =~ /^#{Regexp.escape(gp)}/ }
    end
    $LOAD_PATH.uniq!
  end
end

def default_gemfile
  gemfile = find_gemfile
  raise GemfileNotFound, "Could not locate Gemfile" unless gemfile
  Pathname.new(gemfile)
end

def default_lockfile
  Pathname.new("#{default_gemfile}.lock")
end

def find_gemfile
  given = ENV['BUNDLE_GEMFILE']
  return given if given && !given.empty?
  previous = nil
  current  = File.expand_path(Dir.pwd)
  until !File.directory?(current) || current == previous
    if ENV['BUNDLE_SPEC_RUN']
      # avoid stepping above the tmp directory when testing
      return nil if File.file?(File.join(current, 'bundler.gemspec'))
    end
    # otherwise return the Gemfile if it's there
    filename = File.join(current, 'Gemfile')
    return filename if File.file?(filename)
    current, previous = File.expand_path("..", current), current
  end
end

def in_bundle?
  find_gemfile
end