module Bundler

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

def app_config_path
  ENV['BUNDLE_APP_CONFIG'] ?
    Pathname.new(ENV['BUNDLE_APP_CONFIG']).expand_path(root) :
    root.join('.bundle')
end

def bin_path
  @bin_path ||= begin
    path = settings[:bin] || "bin"
    path = Pathname.new(path).expand_path(root)
    FileUtils.mkdir_p(path)
    Pathname.new(path).expand_path
  end
end

def bundle_path
  # STDERR.puts settings.path
  @bundle_path ||= Pathname.new(settings.path).expand_path(root)
end

def cache
  bundle_path.join("cache/bundler")
end

def configure
  @configured ||= begin
    configure_gem_home_and_path
    true
  end
end

def configure_gem_home_and_path
  if settings[:disable_shared_gems]
    ENV['GEM_PATH'] = ''
    ENV['GEM_HOME'] = File.expand_path(bundle_path, root)
  elsif Gem.dir != bundle_path.to_s
    paths = [Gem.dir, Gem.path].flatten.compact.uniq.reject{|p| p.empty? }
    ENV["GEM_PATH"] = paths.join(File::PATH_SEPARATOR)
    ENV["GEM_HOME"] = bundle_path.to_s
  end
  FileUtils.mkdir_p bundle_path.to_s
  Gem.clear_paths
end

def default_gemfile
  SharedHelpers.default_gemfile
end

def default_lockfile
  SharedHelpers.default_lockfile
end

def definition(unlock = nil)
  @definition = nil if unlock
  @definition ||= begin
    configure
    upgrade_lockfile
    Definition.build(default_gemfile, default_lockfile, unlock)
  end
end

def environment
  Bundler::Environment.new(root, definition)
end

def home
  bundle_path.join("bundler")
end

def install_path
  home.join("gems")
end

def load
  @load ||= Runtime.new(root, definition)
end

def load_gemspec(file)
  path = Pathname.new(file)
  # Eval the gemspec from its parent directory
  Dir.chdir(path.dirname) do
    begin
      Gem::Specification.from_yaml(path.basename)
      # Raises ArgumentError if the file is not valid YAML
    rescue ArgumentError, SyntaxError, Gem::EndOfYAMLException, Gem::Exception
      begin
        eval(File.read(path.basename), TOPLEVEL_BINDING, path.expand_path.to_s)
      rescue LoadError => e
        original_line = e.backtrace.find { |line| line.include?(path.to_s) }
        msg  = "There was a LoadError while evaluating #{path.basename}:\n  #{e.message}"
        msg << " from\n  #{original_line}" if original_line
        msg << "\n"
        if RUBY_VERSION >= "1.9.0"
          msg << "\nDoes it try to require a relative path? That doesn't work in Ruby 1.9."
        end
        raise GemspecError, msg
      end
    end
  end
end

def mkdir_p(path)
  if requires_sudo?
    sudo "mkdir -p '#{path}'" unless File.exist?(path)
  else
    FileUtils.mkdir_p(path)
  end
end

def read_file(file)
  File.open(file, "rb") { |f| f.read }
end

def require(*groups)
  setup(*groups).require(*groups)
end

def requires_sudo?
  return @requires_sudo if @checked_for_sudo
  path = bundle_path
  path = path.parent until path.exist?
  sudo_present = !(`which sudo` rescue '').empty?
  @checked_for_sudo = true
  @requires_sudo = settings.allow_sudo? && !File.writable?(path) && sudo_present
end

def root
  default_gemfile.dirname.expand_path
end

def ruby_scope
  "#{Gem.ruby_engine}/#{Gem::ConfigMap[:ruby_version]}"
end

def settings
  @settings ||= Settings.new(app_config_path)
end

def setup(*groups)
  return @setup if defined?(@setup) && @setup
  if groups.empty?
    # Load all groups, but only once
    @setup = load.setup
  else
    # Figure out which groups haven't been loaded yet
    unloaded = groups - (@completed_groups || [])
    # Record groups that are now loaded
    @completed_groups = groups | (@completed_groups || [])
    # Load any groups that are not yet loaded
    unloaded.any? ? load.setup(*unloaded) : load
  end
end

def specs_path
  bundle_path.join("specifications")
end

def sudo(str)
  `sudo -p 'Enter your password to install the bundled RubyGems to your system: ' #{str}`
end

def tmp
  user_bundle_path.join("tmp", Process.pid.to_s)
end

def ui
  @ui ||= UI.new
end

def upgrade_lockfile
  lockfile = default_lockfile
  if lockfile.exist? && lockfile.read(3) == "---"
    Bundler.ui.warn "Detected Gemfile.lock generated by 0.9, deleting..."
    lockfile.rmtree
  end
end

def user_bundle_path
  Pathname.new(Gem.user_home).join(".bundler")
end

def with_clean_env
  bundled_env = ENV.to_hash
  ENV.replace(ORIGINAL_ENV)
  yield
ensure
  ENV.replace(bundled_env.to_hash)
end