module Gem

# File lib/rubygems.rb, line 222
def self.bin_path(name, exec_name = nil, *requirements)
  # TODO: fails test_self_bin_path_bin_file_gone_in_latest
  # Gem::Specification.find_by_name(name, *requirements).bin_file exec_name

  raise ArgumentError, "you must supply exec_name" unless exec_name

  requirements = Gem::Requirement.default if
    requirements.empty?

  dep = Gem::Dependency.new name, requirements

  loaded = Gem.loaded_specs[name]

  return loaded.bin_file exec_name if loaded && dep.matches_spec?(loaded)

  specs = dep.matching_specs(true)

  raise Gem::GemNotFoundException,
        "can't find gem #{name} (#{requirements})" if specs.empty?

  specs = specs.find_all { |spec|
    spec.executables.include? exec_name
  } if exec_name

  unless spec = specs.last
    msg = "can't find gem #{name} (#{requirements}) with executable #{exec_name}"
    raise Gem::GemNotFoundException, msg
  end

  spec.bin_file exec_name
end

# File lib/rubygems.rb, line 257
def self.binary_mode
  'rb'
end

# File lib/rubygems.rb, line 264
def self.bindir(install_dir=Gem.dir)
  return File.join install_dir, 'bin' unless
    install_dir.to_s == Gem.default_dir.to_s
  Gem.default_bindir
end

# File lib/rubygems.rb, line 1155
def clear_default_specs
  @path_to_default_spec_map.clear
end

# File lib/rubygems.rb, line 275
def self.clear_paths
  @paths         = nil
  @user_home     = nil
  Gem::Specification.reset
  Gem::Security.reset if defined?(Gem::Security)
end

# File lib/rubygems.rb, line 285
def self.config_file
  @config_file ||= File.join Gem.user_home, '.gemrc'
end

# File lib/rubygems.rb, line 292
def self.configuration
  @configuration ||= Gem::ConfigFile.new []
end

# File lib/rubygems.rb, line 300
def self.configuration=(config)
  @configuration = config
end

# File lib/rubygems.rb, line 308
  def self.datadir(gem_name)
# TODO: deprecate
    spec = @loaded_specs[gem_name]
    return nil if spec.nil?
    spec.datadir
  end

# File lib/rubygems/defaults.rb, line 116
def self.default_bindir
  if defined? RUBY_FRAMEWORK_VERSION then # mac framework support
    '/usr/bin'
  else # generic install
    RbConfig::CONFIG['bindir']
  end
end

# File lib/rubygems/defaults.rb, line 145
def self.default_cert_path
  File.join Gem.user_home, ".gem", "gem-public_cert.pem"
end

# File lib/rubygems/defaults.rb, line 29
def self.default_dir
  path = if defined? RUBY_FRAMEWORK_VERSION then
           [
             File.dirname(RbConfig::CONFIG['sitedir']),
             'Gems',
             RbConfig::CONFIG['ruby_version']
           ]
         elsif RbConfig::CONFIG['rubylibprefix'] then
           [
            RbConfig::CONFIG['rubylibprefix'],
            'gems',
            RbConfig::CONFIG['ruby_version']
           ]
         else
           [
             RbConfig::CONFIG['libdir'],
             ruby_engine,
             'gems',
             RbConfig::CONFIG['ruby_version']
           ]
         end

  @default_dir ||= File.join(*path)
end

# File lib/rubygems/defaults.rb, line 102
def self.default_exec_format
  exec_format = RbConfig::CONFIG['ruby_install_name'].sub('ruby', '%s') rescue '%s'

  unless exec_format =~ /%s/ then
    raise Gem::Exception,
      "[BUG] invalid exec_format #{exec_format.inspect}, no %s"
  end

  exec_format
end

# File lib/rubygems/defaults.rb, line 61
def self.default_ext_dir_for base_dir
  nil
end

# File lib/rubygems/defaults.rb, line 152
def self.default_gems_use_full_paths?
  ruby_engine != 'ruby'
end

# File lib/rubygems/defaults.rb, line 138
def self.default_key_path
  File.join Gem.user_home, ".gem", "gem-private_key.pem"
end

# File lib/rubygems/defaults.rb, line 91
def self.default_path
  path = []
  path << user_dir if user_home && File.exist?(user_home)
  path << default_dir
  path << vendor_dir if vendor_dir and File.directory? vendor_dir
  path
end

# File lib/rubygems/defaults.rb, line 68
def self.default_rubygems_dirs
  nil # default to standard layout
end

# File lib/rubygems/defaults.rb, line 13
def self.default_sources
  %w[https://rubygems.org/]
end

# File lib/rubygems/defaults.rb, line 21
def self.default_spec_cache_dir
  File.join Gem.user_home, '.gem', 'specs'
end

# File lib/rubygems.rb, line 318
def self.deflate(data)
  require 'zlib'
  Zlib::Deflate.deflate data
end

# File lib/rubygems.rb, line 345
def self.dir
  paths.home
end

# File lib/rubygems.rb, line 701
def self.done_installing(&hook)
  @done_installing_hooks << hook
end

# File lib/rubygems.rb, line 379
def self.ensure_default_gem_subdirectories dir = Gem.dir, mode = nil
  ensure_subdirectories(dir, mode, REPOSITORY_DEFAULT_GEM_SUBDIRECTORIES)
end

# File lib/rubygems.rb, line 366
def self.ensure_gem_subdirectories dir = Gem.dir, mode = nil
  ensure_subdirectories(dir, mode, REPOSITORY_SUBDIRECTORIES)
end

# File lib/rubygems.rb, line 426
def self.find_files(glob, check_load_path=true)
  files = []

  files = find_files_from_load_path glob if check_load_path

  files.concat Gem::Specification.stubs.map { |spec|
    spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
  }.flatten

  # $LOAD_PATH might contain duplicate entries or reference
  # the spec dirs directly, so we prune.
  files.uniq! if check_load_path

  return files
end

# File lib/rubygems.rb, line 460
def self.find_latest_files(glob, check_load_path=true)
  files = []

  files = find_files_from_load_path glob if check_load_path

  files.concat Gem::Specification.latest_specs(true).map { |spec|
    spec.matches_for_glob("#{glob}#{Gem.suffix_pattern}")
  }.flatten

  # $LOAD_PATH might contain duplicate entries or reference
  # the spec dirs directly, so we prune.
  files.uniq! if check_load_path

  return files
end

# File lib/rubygems.rb, line 1134
def find_unresolved_default_spec(path)
  Gem.suffixes.each do |suffix|
    spec = @path_to_default_spec_map["#{path}#{suffix}"]
    return spec if spec
  end
  nil
end

# File lib/rubygems.rb, line 208
def self.finish_resolve(request_set=Gem::RequestSet.new)
  request_set.import Gem::Specification.unresolved_deps.values

  request_set.resolve_current.each do |s|
    s.full_spec.activate
  end
end

# File lib/rubygems.rb, line 521
def self.gunzip(data)
  require 'rubygems/util'
  Gem::Util.gunzip data
end

# File lib/rubygems.rb, line 529
def self.gzip(data)
  require 'rubygems/util'
  Gem::Util.gzip data
end

# File lib/rubygems.rb, line 561
def self.host
  # TODO: move to utils
  @host ||= Gem::DEFAULT_HOST
end

# File lib/rubygems.rb, line 568
def self.host= host
  # TODO: move to utils
  @host = host
end

# File lib/rubygems.rb, line 537
def self.inflate(data)
  require 'rubygems/util'
  Gem::Util.inflate data
end

# File lib/rubygems.rb, line 550
def self.install name, version = Gem::Requirement.default, *options
  require "rubygems/dependency_installer"
  inst = Gem::DependencyInstaller.new(*options)
  inst.install name, version
  inst.installed_gems
end

# File lib/rubygems.rb, line 829
def self.latest_rubygems_version
  latest_version_for('rubygems-update') or
    raise "Can't find 'rubygems-update' in any repo. Check `gem source list`."
end

# File lib/rubygems.rb, line 816
def self.latest_spec_for name
  dependency   = Gem::Dependency.new name
  fetcher      = Gem::SpecFetcher.fetcher
  spec_tuples, = fetcher.spec_for_dependency dependency

  spec, = spec_tuples.first

  spec
end

# File lib/rubygems.rb, line 837
def self.latest_version_for name
  spec = latest_spec_for name
  spec and spec.version
end

# File lib/rubygems.rb, line 1000
def self.load_env_plugins
  path = "rubygems_plugin"

  files = []
  $LOAD_PATH.each do |load_path|
    globbed = Dir["#{File.expand_path path, load_path}#{Gem.suffix_pattern}"]

    globbed.each do |load_path_file|
      files << load_path_file if File.file?(load_path_file.untaint)
    end
  end

  load_plugin_files files
end

# File lib/rubygems.rb, line 577
def self.load_path_insert_index
  $LOAD_PATH.each_with_index do |path, i|
    return i if path.instance_variable_defined?(:@gem_prelude_index)
  end

  index = $LOAD_PATH.index RbConfig::CONFIG['sitelibdir']

  index
end

# File lib/rubygems.rb, line 988
def self.load_plugins
  # Remove this env var by at least 3.0
  if ENV['RUBYGEMS_LOAD_ALL_PLUGINS']
    load_plugin_files find_files('rubygems_plugin', false)
  else
    load_plugin_files find_latest_files('rubygems_plugin', false)
  end
end

# File lib/rubygems.rb, line 592
def self.load_yaml
  return if @yaml_loaded
  return unless defined?(gem)

  test_syck = ENV['TEST_SYCK']

  # Only Ruby 1.8 and 1.9 have syck
  test_syck = false unless /^1\./ =~ RUBY_VERSION

  unless test_syck
    begin
      gem 'psych', '>= 1.2.1'
    rescue Gem::LoadError
      # It's OK if the user does not have the psych gem installed.  We will
      # attempt to require the stdlib version
    end

    begin
      # Try requiring the gem version *or* stdlib version of psych.
      require 'psych'
    rescue ::LoadError
      # If we can't load psych, thats fine, go on.
    else
      # If 'yaml' has already been required, then we have to
      # be sure to switch it over to the newly loaded psych.
      if defined?(YAML::ENGINE) && YAML::ENGINE.yamler != "psych"
        YAML::ENGINE.yamler = "psych"
      end

      require 'rubygems/psych_additions'
      require 'rubygems/psych_tree'
    end
  end

  require 'yaml'

  # If we're supposed to be using syck, then we may have to force
  # activate it via the YAML::ENGINE API.
  if test_syck and defined?(YAML::ENGINE)
    YAML::ENGINE.yamler = "syck" unless YAML::ENGINE.syck?
  end

  # Now that we're sure some kind of yaml library is loaded, pull
  # in our hack to deal with Syck's DefaultKey ugliness.
  require 'rubygems/syck_hack'

  @yaml_loaded = true
end

# File lib/rubygems.rb, line 644
def self.location_of_caller
  caller[1] =~ /(.*?):(\d+).*?$/i
  file = $1
  lineno = $2.to_i

  [file, lineno]
end

# File lib/rubygems.rb, line 655
def self.marshal_version
  "#{Marshal::MAJOR_VERSION}.#{Marshal::MINOR_VERSION}"
end

# File lib/rubygems.rb, line 200
def self.needs
  rs = Gem::RequestSet.new

  yield rs

  finish_resolve rs
end

# File lib/rubygems.rb, line 349
def self.path
  paths.path
end

# File lib/rubygems/defaults.rb, line 84
def self.path_separator
  File::PATH_SEPARATOR
end

# File lib/rubygems.rb, line 326
def self.paths
  @paths ||= Gem::PathSupport.new
end

# File lib/rubygems.rb, line 334
def self.paths=(env)
  clear_paths
  @paths = Gem::PathSupport.new env
  Gem::Specification.dirs = @paths.path
end

# File lib/rubygems.rb, line 669
def self.platforms
  @platforms ||= []
  if @platforms.empty?
    @platforms = [Gem::Platform::RUBY, Gem::Platform.local]
  end
  @platforms
end

# File lib/rubygems.rb, line 662
def self.platforms=(platforms)
  @platforms = platforms
end

# File lib/rubygems.rb, line 684
def self.post_build(&hook)
  @post_build_hooks << hook
end

# File lib/rubygems.rb, line 692
def self.post_install(&hook)
  @post_install_hooks << hook
end

# File lib/rubygems.rb, line 709
def self.post_reset(&hook)
  @post_reset_hooks << hook
end

# File lib/rubygems.rb, line 718
def self.post_uninstall(&hook)
  @post_uninstall_hooks << hook
end

# File lib/rubygems.rb, line 727
def self.pre_install(&hook)
  @pre_install_hooks << hook
end

# File lib/rubygems.rb, line 735
def self.pre_reset(&hook)
  @pre_reset_hooks << hook
end

# File lib/rubygems.rb, line 744
def self.pre_uninstall(&hook)
  @pre_uninstall_hooks << hook
end

# File lib/rubygems.rb, line 753
def self.prefix
  prefix = File.dirname RUBYGEMS_DIR

  if prefix != File.expand_path(RbConfig::CONFIG['sitelibdir']) and
     prefix != File.expand_path(RbConfig::CONFIG['libdir']) and
     'lib' == File.basename(RUBYGEMS_DIR) then
    prefix
  end
end

# File lib/rubygems.rb, line 773
def self.read_binary(path)
  open path, 'rb+' do |f|
    f.flock(File::LOCK_EX)
    f.read
  end
rescue Errno::EACCES
  open path, 'rb' do |f|
    f.read
  end
rescue Errno::ENOLCK # NFS
  if Thread.main != Thread.current
    raise
  else
    open path, 'rb' do |f|
      f.read
    end
  end
end

# File lib/rubygems.rb, line 766
def self.refresh
  Gem::Specification.reset
end

# File lib/rubygems.rb, line 1113
def register_default_spec(spec)
  new_format = Gem.default_gems_use_full_paths? || spec.require_paths.any? {|path| spec.files.any? {|f| f.start_with? path } }

  if new_format
    prefix_group = spec.require_paths.map {|f| f + "/"}.join("|")
    prefix_pattern = /^(#{prefix_group})/
  end

  spec.files.each do |file|
    if new_format
      file = file.sub(prefix_pattern, "")
      next unless $~
    end

    @path_to_default_spec_map[file] = spec
  end
end

# File lib/rubygems.rb, line 1146
def remove_unresolved_default_spec(spec)
  spec.files.each do |file|
    @path_to_default_spec_map.delete(file)
  end
end

# File lib/rubygems.rb, line 795
def self.ruby
  if @ruby.nil? then
    @ruby = File.join(RbConfig::CONFIG['bindir'],
                      "#{RbConfig::CONFIG['ruby_install_name']}#{RbConfig::CONFIG['EXEEXT']}")

    @ruby = "\"#{@ruby}\"" if @ruby =~ /\s/
  end

  @ruby
end

# File lib/rubygems/test_case.rb, line 64
def self.ruby= ruby
  @ruby = ruby
end

# File lib/rubygems.rb, line 809
def self.ruby_api_version
  @ruby_api_version ||= RbConfig::CONFIG['ruby_version'].dup
end

# File lib/rubygems/defaults.rb, line 127
def self.ruby_engine
  if defined? RUBY_ENGINE then
    RUBY_ENGINE
  else
    'ruby'
  end
end

# File lib/rubygems.rb, line 845
def self.ruby_version
  return @ruby_version if defined? @ruby_version
  version = RUBY_VERSION.dup

  if defined?(RUBY_PATCHLEVEL) && RUBY_PATCHLEVEL != -1 then
    version << ".#{RUBY_PATCHLEVEL}"
  elsif defined?(RUBY_REVISION) then
    version << ".dev.#{RUBY_REVISION}"
  end

  @ruby_version = Gem::Version.new version
end

# File lib/rubygems.rb, line 861
def self.rubygems_version
  return @rubygems_version if defined? @rubygems_version
  @rubygems_version = Gem::Version.new Gem::VERSION
end

# File lib/rubygems/test_case.rb, line 48
def self.searcher=(searcher)
  @searcher = searcher
end

# File lib/rubygems.rb, line 870
def self.sources
  @sources ||= Gem::SourceList.from(default_sources)
end

# File lib/rubygems.rb, line 881
def self.sources= new_sources
  if !new_sources
    @sources = nil
  else
    @sources = Gem::SourceList.from(new_sources)
  end
end

# File lib/rubygems.rb, line 353
def self.spec_cache_dir
  paths.spec_cache_dir
end

# File lib/rubygems.rb, line 892
def self.suffix_pattern
  @suffix_pattern ||= "{#{suffixes.join(',')}}"
end

# File lib/rubygems.rb, line 899
def self.suffixes
  @suffixes ||= ['',
                 '.rb',
                 *%w(DLEXT DLEXT2).map { |key|
                   val = RbConfig::CONFIG[key]
                   next unless val and not val.empty?
                   ".#{val}"
                 }
                ].compact.uniq
end

# File lib/rubygems.rb, line 914
def self.time(msg, width = 0, display = Gem.configuration.verbose)
  now = Time.now

  value = yield

  elapsed = Time.now - now

  ui.say "%2$*1$s: %3$3.3fs" % [-width, msg, elapsed] if display

  value
end

# File lib/rubygems.rb, line 180
def self.try_activate path
  # finds the _latest_ version... regardless of loaded specs and their deps
  # if another gem had a requirement that would mean we shouldn't
  # activate the latest version, then either it would already be activated
  # or if it was ambiguous (and thus unresolved) the code in our custom
  # require will try to activate the more specific version.

  spec = Gem::Specification.find_by_path path
  return false unless spec
  return true if spec.activated?

  begin
    spec.activate
  rescue Gem::LoadError # this could fail due to gem dep collisions, go lax
    Gem::Specification.find_by_name(spec.name).activate
  end

  return true
end

# File lib/rubygems.rb, line 929
def self.ui
  require 'rubygems/user_interaction'

  Gem::DefaultUserInteraction.ui
end

# File lib/rubygems.rb, line 1035
def self.use_gemdeps path = nil
  raise_exception = path

  path ||= ENV['RUBYGEMS_GEMDEPS']
  return unless path

  path = path.dup

  if path == "-" then
    require 'rubygems/util'

    Gem::Util.traverse_parents Dir.pwd do |directory|
      dep_file = GEM_DEP_FILES.find { |f| File.file?(f) }

      next unless dep_file

      path = File.join directory, dep_file
      break
    end
  end

  path.untaint

  unless File.file? path then
    return unless raise_exception

    raise ArgumentError, "Unable to find gem dependencies file at #{path}"
  end

  rs = Gem::RequestSet.new
  @gemdeps = rs.load_gemdeps path

  rs.resolve_current.map do |s|
    sp = s.full_spec
    sp.activate
    sp
  end
rescue Gem::LoadError, Gem::UnsatisfiableDependencyError => e
  warn e.message
  warn "You may need to `gem install -g` to install missing gems"
  warn ""
end

# File lib/rubygems.rb, line 939
def self.use_paths(home, *paths)
  paths = nil if paths == [nil]
  paths = paths.first if Array === Array(paths).first
  self.paths = { "GEM_HOME" => home, "GEM_PATH" => paths }
end

# File lib/rubygems/defaults.rb, line 75
def self.user_dir
  parts = [Gem.user_home, '.gem', ruby_engine]
  parts << RbConfig::CONFIG['ruby_version'] unless RbConfig::CONFIG['ruby_version'].empty?
  File.join parts
end

# File lib/rubygems.rb, line 948
def self.user_home
  @user_home ||= find_home.untaint
end

# File lib/rubygems/test_case.rb, line 56
def self.win_platform=(val)
  @@win_platform = val
end

# File lib/rubygems.rb, line 955
def self.win_platform?
  if @@win_platform.nil? then
    ruby_platform = RbConfig::CONFIG['host_os']
    @@win_platform = !!WIN_PATTERNS.find { |r| ruby_platform =~ r }
  end

  @@win_platform
end