class Bundler::Runtime

def cache(custom_path = nil)
  cache_path = Bundler.app_cache(custom_path)
  SharedHelpers.filesystem_access(cache_path) do |p|
    FileUtils.mkdir_p(p)
  end unless File.exist?(cache_path)
  Bundler.ui.info "Updating files in #{Bundler.settings.app_cache_path}"
  # Do not try to cache specification for the gem described by the .gemspec
  root_gem_name = nil
  if gemspec_cache_hash = Bundler.instance_variable_get(:@gemspec_cache)
    gemspec = gemspec_cache_hash.values.first
    root_gem_name = gemspec.name unless gemspec.nil?
  end
  specs.each do |spec|
    next if spec.name == "bundler"
    next if File.exist?("#{root_gem_name}.gemspec") && spec.source.class == Bundler::Source::Path && root_gem_name && spec.name == root_gem_name
    spec.source.send(:fetch_gem, spec) if Bundler.settings[:cache_all_platforms] && spec.source.respond_to?(:fetch_gem, true)
    spec.source.cache(spec, custom_path) if spec.source.respond_to?(:cache)
  end
  Dir[cache_path.join("*/.git")].each do |git_dir|
    FileUtils.rm_rf(git_dir)
    FileUtils.touch(File.expand_path("../.bundlecache", git_dir))
  end
  prune_cache(cache_path) unless Bundler.settings[:no_prune]
end

def clean(dry_run = false)
  gem_bins             = Dir["#{Gem.dir}/bin/*"]
  git_dirs             = Dir["#{Gem.dir}/bundler/gems/*"]
  git_cache_dirs       = Dir["#{Gem.dir}/cache/bundler/git/*"]
  gem_dirs             = Dir["#{Gem.dir}/gems/*"]
  gem_files            = Dir["#{Gem.dir}/cache/*.gem"]
  gemspec_files        = Dir["#{Gem.dir}/specifications/*.gemspec"]
  spec_gem_paths       = []
  # need to keep git sources around
  spec_git_paths       = @definition.spec_git_paths
  spec_git_cache_dirs  = []
  spec_gem_executables = []
  spec_cache_paths     = []
  spec_gemspec_paths   = []
  specs.each do |spec|
    spec_gem_paths << spec.full_gem_path
    # need to check here in case gems are nested like for the rails git repo
    md = %r{(.+bundler/gems/.+-[a-f0-9]{7,12})}.match(spec.full_gem_path)
    spec_git_paths << md[1] if md
    spec_gem_executables << spec.executables.collect do |executable|
      e = "#{Bundler.rubygems.gem_bindir}/#{executable}"
      [e, "#{e}.bat"]
    end
    spec_cache_paths << spec.cache_file
    spec_gemspec_paths << spec.spec_file
    spec_git_cache_dirs << spec.source.cache_path.to_s if spec.source.is_a?(Bundler::Source::Git)
  end
  spec_gem_paths.uniq!
  spec_gem_executables.flatten!
  stale_gem_bins       = gem_bins - spec_gem_executables
  stale_git_dirs       = git_dirs - spec_git_paths - ["#{Gem.dir}/bundler/gems/extensions"]
  stale_git_cache_dirs = git_cache_dirs - spec_git_cache_dirs
  stale_gem_dirs       = gem_dirs - spec_gem_paths
  stale_gem_files      = gem_files - spec_cache_paths
  stale_gemspec_files  = gemspec_files - spec_gemspec_paths
  removed_stale_gem_dirs = stale_gem_dirs.collect {|dir| remove_dir(dir, dry_run) }
  removed_stale_git_dirs = stale_git_dirs.collect {|dir| remove_dir(dir, dry_run) }
  output = removed_stale_gem_dirs + removed_stale_git_dirs
  unless dry_run
    stale_files = stale_gem_bins + stale_gem_files + stale_gemspec_files
    stale_files.each {|file| FileUtils.rm(file) if File.exist?(file) }
    stale_git_cache_dirs.each {|dir| FileUtils.rm_rf(dir) if File.exist?(dir) }
  end
  output
end

def dependencies_for(*groups)
  if groups.empty?
    dependencies
  else
    dependencies.select {|d| (groups & d.groups).any? }
  end
end

def prune_cache(cache_path)
  SharedHelpers.filesystem_access(cache_path) do |p|
    FileUtils.mkdir_p(p)
  end unless File.exist?(cache_path)
  resolve = @definition.resolve
  prune_gem_cache(resolve, cache_path)
  prune_git_and_path_cache(resolve, cache_path)
end

def prune_gem_cache(resolve, cache_path)
  cached = Dir["#{cache_path}/*.gem"]
  cached = cached.delete_if do |path|
    spec = Bundler.rubygems.spec_from_gem path
    resolve.any? do |s|
      s.name == spec.name && s.version == spec.version && !s.source.is_a?(Bundler::Source::Git)
    end
  end
  if cached.any?
    Bundler.ui.info "Removing outdated .gem files from #{Bundler.settings.app_cache_path}"
    cached.each do |path|
      Bundler.ui.info "  * #{File.basename(path)}"
      File.delete(path)
    end
  end
end

def prune_git_and_path_cache(resolve, cache_path)
  cached = Dir["#{cache_path}/*/.bundlecache"]
  cached = cached.delete_if do |path|
    name = File.basename(File.dirname(path))
    resolve.any? do |s|
      source = s.source
      source.respond_to?(:app_cache_dirname) && source.app_cache_dirname == name
    end
  end
  if cached.any?
    Bundler.ui.info "Removing outdated git and path gems from #{Bundler.settings.app_cache_path}"
    cached.each do |path|
      path = File.dirname(path)
      Bundler.ui.info "  * #{File.basename(path)}"
      FileUtils.rm_rf(path)
    end
  end
end

def remove_dir(dir, dry_run)
  full_name = Pathname.new(dir).basename.to_s
  parts    = full_name.split("-")
  name     = parts[0..-2].join("-")
  version  = parts.last
  output   = "#{name} (#{version})"
  if dry_run
    Bundler.ui.info "Would have removed #{output}"
  else
    Bundler.ui.info "Removing #{output}"
    FileUtils.rm_rf(dir)
  end
  output
end

def require(*groups)
  groups.map!(&:to_sym)
  groups = [:default] if groups.empty?
  @definition.dependencies.each do |dep|
    # Skip the dependency if it is not in any of the requested
    # groups
    next unless (dep.groups & groups).any? && dep.current_platform?
    required_file = nil
    begin
      # Loop through all the specified autorequires for the
      # dependency. If there are none, use the dependency's name
      # as the autorequire.
      Array(dep.autorequire || dep.name).each do |file|
        # Allow `require: true` as an alias for `require: <name>`
        file = dep.name if file == true
        required_file = file
        begin
          Kernel.require file
        rescue => e
          raise e if e.is_a?(LoadError) # we handle this a little later
          raise Bundler::GemRequireError.new e,
            "There was an error while trying to load the gem '#{file}'."
        end
      end
    rescue LoadError => e
      REQUIRE_ERRORS.find {|r| r =~ e.message }
      raise if dep.autorequire || $1 != required_file
      if dep.autorequire.nil? && dep.name.include?("-")
        begin
          namespaced_file = dep.name.tr("-", "/")
          Kernel.require namespaced_file
        rescue LoadError => e
          REQUIRE_ERRORS.find {|r| r =~ e.message }
          raise if $1 != namespaced_file
        end
      end
    end
  end
end

def setup(*groups)
  groups.map!(&:to_sym)
  # Has to happen first
  clean_load_path
  specs = groups.any? ? @definition.specs_for(groups) : requested_specs
  setup_environment
  Bundler.rubygems.replace_entrypoints(specs)
  # Activate the specs
  specs.each do |spec|
    unless spec.loaded_from
      raise GemNotFound, "#{spec.full_name} is missing. Run `bundle` to get it."
    end
    if (activated_spec = Bundler.rubygems.loaded_specs(spec.name)) && activated_spec.version != spec.version
      e = Gem::LoadError.new "You have already activated #{activated_spec.name} #{activated_spec.version}, " \
                             "but your Gemfile requires #{spec.name} #{spec.version}. Prepending " \
                             "`bundle exec` to your command may solve this."
      e.name = spec.name
      if e.respond_to?(:requirement=)
        e.requirement = Gem::Requirement.new(spec.version.to_s)
      else
        e.version_requirement = Gem::Requirement.new(spec.version.to_s)
      end
      raise e
    end
    Bundler.rubygems.mark_loaded(spec)
    load_paths = spec.load_paths.reject {|path| $LOAD_PATH.include?(path) }
    $LOAD_PATH.unshift(*load_paths)
  end
  setup_manpath
  lock(:preserve_bundled_with => true)
  self
end

def setup_environment
  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"] = default_gemfile.to_s
  SharedHelpers.set_bundle_environment
end

def setup_manpath
  # Store original MANPATH for restoration later in with_clean_env()
  ENV["BUNDLE_ORIG_MANPATH"] = ENV["MANPATH"]
  # Add man/ subdirectories from activated bundles to MANPATH for man(1)
  manuals = $LOAD_PATH.map do |path|
    man_subdir = path.sub(/lib$/, "man")
    man_subdir unless Dir[man_subdir + "/man?/"].empty?
  end.compact
  unless manuals.empty?
    ENV["MANPATH"] = manuals.concat(
      ENV["MANPATH"].to_s.split(File::PATH_SEPARATOR)
    ).uniq.join(File::PATH_SEPARATOR)
  end
end