module Bundler

def self.preserve_gem_path
  original_gem_path = ENV["_ORIGINAL_GEM_PATH"]
  gem_path          = ENV["GEM_PATH"]
  ENV["_ORIGINAL_GEM_PATH"] = gem_path          if original_gem_path.nil? || original_gem_path == ""
  ENV["GEM_PATH"]           = original_gem_path if gem_path.nil? || gem_path == ""
end

def self.with_friendly_errors
  begin
    yield
  rescue Bundler::BundlerError => e
    Bundler.ui.error e.message
    Bundler.ui.debug e.backtrace.join("\n")
    exit e.status_code
  rescue Interrupt => e
    Bundler.ui.error "\nQuitting..."
    Bundler.ui.debug e.backtrace.join("\n")
    exit 1
  rescue SystemExit => e
    exit e.status
  rescue Exception => e
    Bundler.ui.error(
      "Unfortunately, a fatal error has occurred. Please see the Bundler \n" \
      "troubleshooting documentation at http://bit.ly/bundler-issues. Thanks! \n")
    raise e
  end
end

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
  @bundle_path ||= Pathname.new(settings.path).expand_path(root)
end

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

def clean_exec(*args)
  with_clean_env { Kernel.exec(*args) }
end

def clean_system(*args)
  with_clean_env { Kernel.system(*args) }
end

def clear_gemspec_cache
  @gemspec_cache = {}
end

def configure
  @configured ||= configure_gem_home_and_path
end

def configure_gem_home
  # TODO: This mkdir_p is only needed for JRuby <= 1.5 and should go away (GH #602)
  FileUtils.mkdir_p bundle_path.to_s rescue nil
  ENV['GEM_HOME'] = File.expand_path(bundle_path, root)
  Bundler.rubygems.clear_paths
end

def configure_gem_home_and_path
  blank_home = ENV['GEM_HOME'].nil? || ENV['GEM_HOME'].empty?
  if settings[:disable_shared_gems]
    ENV['GEM_PATH'] = ''
    configure_gem_home
  elsif blank_home || Bundler.rubygems.gem_dir != bundle_path.to_s
    possibles = [Bundler.rubygems.gem_dir, Bundler.rubygems.gem_path]
    paths = possibles.flatten.compact.uniq.reject { |p| p.empty? }
    ENV["GEM_PATH"] = paths.join(File::PATH_SEPARATOR)
    configure_gem_home
  end
  Bundler.rubygems.refresh
  bundle_path
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)
  @gemspec_cache ||= {}
  key = File.expand_path(file)
  spec = ( @gemspec_cache[key] ||= load_gemspec_uncached(file) )
  # Protect against caching side-effected gemspecs by returning a
  # new instance each time.
  spec.dup if spec
end

def load_gemspec_uncached(file)
  path = Pathname.new(file)
  # Eval the gemspec from its parent directory
  Dir.chdir(path.dirname.to_s) do
    contents = File.read(path.basename.to_s)
    begin
      Gem::Specification.from_yaml(contents)
      # Raises ArgumentError if the file is not valid YAML
    rescue ArgumentError, SyntaxError, Gem::EndOfYAMLException, Gem::Exception
      begin
        eval(contents, TOPLEVEL_BINDING, path.expand_path.to_s)
      rescue LoadError, SyntaxError => e
        original_line = e.backtrace.find { |line| line.include?(path.to_s) }
        msg  = "There was a #{e.class} while evaluating #{path.basename}: \n#{e.message}"
        msg << " from\n  #{original_line}" if original_line
        msg << "\n"
        if e.is_a?(LoadError) && RUBY_VERSION >= "1.9"
          msg << "\nDoes it try to require a relative path? That's been removed 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 defined?(@checked_for_sudo)
  path = bundle_path
  path = path.parent until path.exist?
  sudo_present = which "sudo"
  bin_dir = Pathname.new(Bundler.system_bindir)
  bin_dir = bin_dir.parent until bin_dir.exist?
  @checked_for_sudo = true
  sudo_gems = !File.writable?(path) || !File.writable?(bin_dir)
  @requires_sudo = settings.allow_sudo? && sudo_gems && sudo_present
end

def root
  default_gemfile.dirname.expand_path
end

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

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

def setup(*groups)
  # Just return if all groups are already loaded
  return @setup if defined?(@setup)
  definition.validate_ruby!
  if groups.empty?
    # Load all groups, but only once
    @setup = load.setup
  else
    @completed_groups ||= []
    # Figure out which groups haven't been loaded yet
    unloaded = groups - @completed_groups
    # Record groups that are now loaded
    @completed_groups = groups
    unloaded.any? ? load.setup(*groups) : 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 system_bindir
  # Gem.bindir doesn't always return the location that Rubygems will install
  # system binaries. If you put '-n foo' in your .gemrc, Rubygems will
  # install binstubs there instead. Unfortunately, Rubygems doesn't expose
  # that directory at all, so rather than parse .gemrc ourselves, we allow
  # the directory to be set as well, via `bundle config bindir foo`.
  Bundler.settings[:system_bindir] || Bundler.rubygems.gem_bindir
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(Bundler.rubygems.user_home).join(".bundler")
end

def which(executable)
  if File.executable?(executable)
    executable
  elsif ENV['PATH']
    path = ENV['PATH'].split(File::PATH_SEPARATOR).find do |p|
      File.executable?(File.join(p, executable))
    end
    path && File.expand_path(executable, path)
  end
end

def with_clean_env
  with_original_env do
    ENV.delete_if { |k,_| k[0,7] == 'BUNDLE_' }
    if ENV.has_key? 'RUBYOPT'
      ENV['RUBYOPT'] = ENV['RUBYOPT'].sub '-rbundler/setup', ''
      ENV['RUBYOPT'] = ENV['RUBYOPT'].sub "-I#{File.expand_path('..', __FILE__)}", ''
    end
    yield
  end
end

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