module Bundler::SharedHelpers

def bundler_ruby_lib
  File.expand_path("../..", __FILE__)
end

def chdir(dir, &blk)
  Bundler.rubygems.ext_lock.synchronize do
    Dir.chdir dir, &blk
  end
end

def clean_load_path
  # handle 1.9 where system gems are always on the load path
  return unless defined?(::Gem)
  bundler_lib = bundler_ruby_lib
  loaded_gem_paths = Bundler.rubygems.loaded_gem_paths
  $LOAD_PATH.reject! do |p|
    next if File.expand_path(p).start_with?(bundler_lib)
    loaded_gem_paths.delete(p)
  end
  $LOAD_PATH.uniq!
end

def const_get_safely(constant_name, namespace)
  const_in_namespace = namespace.constants.include?(constant_name.to_s) ||
    namespace.constants.include?(constant_name.to_sym)
  return nil unless const_in_namespace
  namespace.const_get(constant_name)
end

def default_bundle_dir
  bundle_dir = find_directory(".bundle")
  return nil unless bundle_dir
  bundle_dir = Pathname.new(bundle_dir)
  global_bundle_dir = Bundler.user_home.join(".bundle")
  return nil if bundle_dir == global_bundle_dir
  bundle_dir
end

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

def default_lockfile
  gemfile = default_gemfile
  case gemfile.basename.to_s
  when "gems.rb" then Pathname.new(gemfile.sub(/.rb$/, ".locked"))
  else Pathname.new("#{gemfile}.lock")
  end.untaint
end

def deprecate_gemfile(gemfile)
  return unless gemfile && File.basename(gemfile) == "Gemfile"
  Bundler::SharedHelpers.major_deprecation \
    "gems.rb and gems.locked will be prefered to Gemfile and Gemfile.lock."
end

def filesystem_access(path, action = :write, &block)
  # Use block.call instead of yield because of a bug in Ruby 2.2.2
  # See https://github.com/bundler/bundler/issues/5341 for details
  block.call(path.dup.untaint)
rescue Errno::EACCES
  raise PermissionError.new(path, action)
rescue Errno::EAGAIN
  raise TemporaryResourceError.new(path, action)
rescue Errno::EPROTO
  raise VirtualProtocolError.new
rescue Errno::ENOSPC
  raise NoSpaceOnDeviceError.new(path, action)
rescue *[const_get_safely(:ENOTSUP, Errno)].compact
  raise OperationNotSupportedError.new(path, action)
rescue Errno::EEXIST, Errno::ENOENT
  raise
rescue SystemCallError => e
  raise GenericSystemCallError.new(e, "There was an error accessing `#{path}`.")
end

def find_directory(*names)
  search_up(*names) do |dirname|
    return dirname if File.directory?(dirname)
  end
end

def find_file(*names)
  search_up(*names) do |filename|
    return filename if File.file?(filename)
  end
end

def find_gemfile
  given = ENV["BUNDLE_GEMFILE"]
  return given if given && !given.empty?
  find_file("Gemfile", "gems.rb")
end

def in_bundle?
  find_gemfile
end

def major_deprecation(message)
  return unless prints_major_deprecations?
  @major_deprecation_ui ||= Bundler::UI::Shell.new("no-color" => true)
  ui = Bundler.ui.is_a?(@major_deprecation_ui.class) ? Bundler.ui : @major_deprecation_ui
  ui.warn("[DEPRECATED FOR #{Bundler::VERSION.split(".").first.to_i + 1}.0] #{message}")
end

def print_major_deprecations!
  deprecate_gemfile(find_gemfile) if find_gemfile == find_file("Gemfile")
  if RUBY_VERSION < "2"
    major_deprecation("Bundler will only support ruby >= 2.0, you are running #{RUBY_VERSION}")
  end
  return if Bundler.rubygems.provides?(">= 2")
  major_deprecation("Bundler will only support rubygems >= 2.0, you are running #{Bundler.rubygems.version}")
end

def prints_major_deprecations?
  require "bundler"
  deprecation_release = Bundler::VERSION.split(".").drop(1).include?("99")
  return false if !deprecation_release && !Bundler.settings[:major_deprecations]
  require "bundler/deprecate"
  return false if Bundler::Deprecate.skip
  true
end

def pwd
  Bundler.rubygems.ext_lock.synchronize do
    Pathname.pwd
  end
end

def search_up(*names)
  previous = nil
  current  = File.expand_path(SharedHelpers.pwd).untaint
  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
    names.each do |name|
      filename = File.join(current, name)
      yield filename
    end
    previous = current
    current = File.expand_path("..", current)
  end
end

def set_bundle_environment
  set_bundle_variables
  set_path
  set_rubyopt
  set_rubylib
end

def set_bundle_variables
  begin
    ENV["BUNDLE_BIN_PATH"] = Bundler.rubygems.bin_path("bundler", "bundle", VERSION)
  rescue Gem::GemNotFoundException
    ENV["BUNDLE_BIN_PATH"] = File.expand_path("../../../exe/bundle", __FILE__)
  end
  # Set BUNDLE_GEMFILE
  ENV["BUNDLE_GEMFILE"] = find_gemfile.to_s
  ENV["BUNDLER_VERSION"] = Bundler::VERSION
end

def set_path
  paths = (ENV["PATH"] || "").split(File::PATH_SEPARATOR)
  paths.unshift "#{Bundler.bundle_path}/bin"
  ENV["PATH"] = paths.uniq.join(File::PATH_SEPARATOR)
end

def set_rubylib
  rubylib = (ENV["RUBYLIB"] || "").split(File::PATH_SEPARATOR)
  rubylib.unshift bundler_ruby_lib
  ENV["RUBYLIB"] = rubylib.uniq.join(File::PATH_SEPARATOR)
end

def set_rubyopt
  rubyopt = [ENV["RUBYOPT"]].compact
  return if !rubyopt.empty? && rubyopt.first =~ %r{-rbundler/setup}
  rubyopt.unshift %(-rbundler/setup)
  ENV["RUBYOPT"] = rubyopt.join(" ")
end

def with_clean_git_env(&block)
  keys    = %w(GIT_DIR GIT_WORK_TREE)
  old_env = keys.inject({}) do |h, k|
    h.update(k => ENV[k])
  end
  keys.each {|key| ENV.delete(key) }
  block.call
ensure
  keys.each {|key| ENV[key] = old_env[key] }
end