class Gem::RequestSet::GemDependencyAPI

def add_dependencies(groups, dependencies) # :nodoc:
  return unless (groups & @without_groups).empty?
  dependencies.each do |dep|
    @set.gem dep.name, *dep.requirement.as_list
  end
end

def find_gemspec(name, path) # :nodoc:
  glob = File.join path, "#{name}.gemspec"
  spec_files = Dir[glob]
  case spec_files.length
  when 1 then
    spec_file = spec_files.first
    spec = Gem::Specification.load spec_file
    return spec if spec
    raise ArgumentError, "invalid gemspec #{spec_file}"
  when 0 then
    raise ArgumentError, "no gemspecs found at #{Dir.pwd}"
  else
    raise ArgumentError,
      "found multiple gemspecs at #{Dir.pwd}, " \
      "use the name: option to specify the one you want"
  end
end

def gem(name, *requirements)
  options = requirements.pop if requirements.last.is_a?(Hash)
  options ||= {}
  options[:git] = @current_repository if @current_repository
  source_set = false
  source_set ||= gem_path       name, options
  source_set ||= gem_git        name, options
  source_set ||= gem_git_source name, options
  source_set ||= gem_source     name, options
  duplicate = @dependencies.include? name
  @dependencies[name] =
    if requirements.empty? && !source_set
      Gem::Requirement.default
    elsif source_set
      Gem::Requirement.source_set
    else
      Gem::Requirement.create requirements
    end
  return unless gem_platforms name, options
  groups = gem_group name, options
  return unless (groups & @without_groups).empty?
  pin_gem_source name, :default unless source_set
  gem_requires name, options
  if duplicate
    warn <<-WARNING
m dependencies file #{@path} requires #{name} more than once.
    WARNING
  end
  @set.gem name, *requirements
end

def gem_deps_file # :nodoc:
  File.basename @path
end

def gem_git(name, options) # :nodoc:
  if gist = options.delete(:gist)
    options[:git] = "https://gist.github.com/#{gist}.git"
  end
  return unless repository = options.delete(:git)
  pin_gem_source name, :git, repository
  reference = gem_git_reference options
  submodules = options.delete :submodules
  @git_set.add_git_gem name, repository, reference, submodules
  true
end

def gem_git_reference(options) # :nodoc:
  ref    = options.delete :ref
  branch = options.delete :branch
  tag    = options.delete :tag
  reference = nil
  reference ||= ref
  reference ||= branch
  reference ||= tag
  if ref && branch
    warn <<-WARNING
m dependencies file #{@path} includes git reference for both ref and branch but only ref is used.
    WARNING
  end
  if (ref || branch) && tag
    warn <<-WARNING
m dependencies file #{@path} includes git reference for both ref/branch and tag but only ref/branch is used.
    WARNING
  end
  reference
end

def gem_git_source(name, options) # :nodoc:
  return unless git_source = (@git_sources.keys & options.keys).last
  source_callback = @git_sources[git_source]
  source_param = options.delete git_source
  git_url = source_callback.call source_param
  options[:git] = git_url
  gem_git name, options
  true
end

def gem_group(name, options) # :nodoc:
  g = options.delete :group
  all_groups = g ? Array(g) : []
  groups = options.delete :groups
  all_groups |= groups if groups
  all_groups |= @current_groups if @current_groups
  all_groups
end

def gem_path(name, options) # :nodoc:
  return unless directory = options.delete(:path)
  pin_gem_source name, :path, directory
  @vendor_set.add_vendor_gem name, directory
  true
end

def gem_platforms(name, options) # :nodoc:
  platform_names = Array(options.delete(:platform))
  platform_names.concat Array(options.delete(:platforms))
  platform_names.concat @current_platforms if @current_platforms
  return true if platform_names.empty?
  platform_names.any? do |platform_name|
    raise ArgumentError, "unknown platform #{platform_name.inspect}" unless
      platform = PLATFORM_MAP[platform_name]
    next false unless Gem::Platform.match_gem? platform, name
    if engines = ENGINE_MAP[platform_name]
      next false unless engines.include? Gem.ruby_engine
    end
    case WINDOWS[platform_name]
    when :only then
      next false unless Gem.win_platform?
    when :never then
      next false if Gem.win_platform?
    end
    VERSION_MAP[platform_name].satisfied_by? Gem.ruby_version
  end
end

def gem_requires(name, options) # :nodoc:
  if options.include? :require
    if requires = options.delete(:require)
      @requires[name].concat Array requires
    end
  else
    @requires[name] << name
  end
  raise ArgumentError, "Unhandled gem options #{options.inspect}" unless options.empty?
end

def gem_source(name, options) # :nodoc:
  return unless source = options.delete(:source)
  pin_gem_source name, :source, source
  @source_set.add_source_gem name, source
  true
end

def gemspec(options = {})
  name              = options.delete(:name) || "{,*}"
  path              = options.delete(:path) || "."
  development_group = options.delete(:development_group) || :development
  spec = find_gemspec name, path
  groups = gem_group spec.name, {}
  self_dep = Gem::Dependency.new spec.name, spec.version
  add_dependencies groups, [self_dep]
  add_dependencies groups, spec.runtime_dependencies
  @dependencies[spec.name] = Gem::Requirement.source_set
  spec.dependencies.each do |dep|
    @dependencies[dep.name] = dep.requirement
  end
  groups << development_group
  add_dependencies groups, spec.development_dependencies
  @vendor_set.add_vendor_gem spec.name, path
  gem_requires spec.name, options
end

def git(repository)
  @current_repository = repository
  yield
ensure
  @current_repository = nil
end

def git_source(name, &callback)
  @git_sources[name] = callback
end

def group(*groups)
  @current_groups = groups
  yield
ensure
  @current_groups = nil
end

def initialize(set, path)
  @set = set
  @path = path
  @current_groups     = nil
  @current_platforms  = nil
  @current_repository = nil
  @dependencies       = {}
  @default_sources    = true
  @git_set            = @set.git_set
  @git_sources        = {}
  @installing         = false
  @requires           = Hash.new {|h, name| h[name] = [] }
  @vendor_set         = @set.vendor_set
  @source_set         = @set.source_set
  @gem_sources        = {}
  @without_groups     = []
  git_source :github do |repo_name|
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include? "/"
    "https://github.com/#{repo_name}.git"
  end
  git_source :bitbucket do |repo_name|
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include? "/"
    user, = repo_name.split "/", 2
    "https://#{user}@bitbucket.org/#{repo_name}.git"
  end
end

def installing=(installing) # :nodoc:
  @installing = installing
end

def load
  instance_eval File.read(@path), @path, 1
  self
end

def pin_gem_source(name, type = :default, source = nil)
  source_description =
    case type
    when :default then "(default)"
    when :path    then "path: #{source}"
    when :git     then "git: #{source}"
    when :source  then "source: #{source}"
    else               "(unknown)"
    end
  raise ArgumentError,
    "duplicate source #{source_description} for gem #{name}" if
      @gem_sources.fetch(name, source) != source
  @gem_sources[name] = source
end

def platform(*platforms)
  @current_platforms = platforms
  yield
ensure
  @current_platforms = nil
end

def ruby(version, options = {})
  engine         = options[:engine]
  engine_version = options[:engine_version]
  raise ArgumentError,
        "You must specify engine_version along with the Ruby engine" if
          engine && !engine_version
  return true if @installing
  unless version == RUBY_VERSION
    message = "Your Ruby version is #{RUBY_VERSION}, " \
              "but your #{gem_deps_file} requires #{version}"
    raise Gem::RubyVersionMismatch, message
  end
  if engine && engine != Gem.ruby_engine
    message = "Your Ruby engine is #{Gem.ruby_engine}, " \
              "but your #{gem_deps_file} requires #{engine}"
    raise Gem::RubyVersionMismatch, message
  end
  if engine_version
    if engine_version != RUBY_ENGINE_VERSION
      message =
        "Your Ruby engine version is #{Gem.ruby_engine} #{RUBY_ENGINE_VERSION}, " \
        "but your #{gem_deps_file} requires #{engine} #{engine_version}"
      raise Gem::RubyVersionMismatch, message
    end
  end
  true
end

def source(url)
  Gem.sources.clear if @default_sources
  @default_sources = false
  Gem.sources << url
end