Class: Gem::DependencyInstaller

# File 'lib/rubygems/dependency_installer.rb', line 191

def consider_remote?
  @domain == :both or @domain == :remote
end

# File 'lib/rubygems/dependency_installer.rb', line 38

attr_reader :document

# File 'lib/rubygems/dependency_installer.rb', line 43

attr_reader :errors

# File 'lib/rubygems/dependency_installer.rb', line 48

attr_reader :installed_gems

# File 'lib/rubygems/dependency_installer.rb', line 167

def available_set_for(dep_or_name, version) # :nodoc:
  if String === dep_or_name
    find_spec_by_name_and_version dep_or_name, version, @prerelease
  else
    dep = dep_or_name.dup
    dep.prerelease = @prerelease
    @available = find_gems_with_sources dep
  end

  @available.pick_best!
end

# File 'lib/rubygems/dependency_installer.rb', line 201

def find_gems_with_sources(dep, best_only=false) # :nodoc:
  set = Gem::AvailableSet.new

  if consider_local?
    sl = Gem::Source::Local.new

    if spec = sl.find_gem(dep.name)
      if dep.matches_spec? spec
        set.add spec, sl
      end
    end
  end

  if consider_remote?
    begin
      # TODO this is pulled from #spec_for_dependency to allow
      # us to filter tuples before fetching specs.
      #
      tuples, errors = Gem::SpecFetcher.fetcher.search_for_dependency dep

      if best_only && !tuples.empty?
        tuples.sort! do |a,b|
          if b[0].version == a[0].version
            if b[0].platform != Gem::Platform::RUBY
              1
            else
              -1
            end
          else
            b[0].version <=> a[0].version
          end
        end
        tuples = [tuples.first]
      end

      specs = []
      tuples.each do |tup, source|
        begin
          spec = source.fetch_spec(tup)
        rescue Gem::RemoteFetcher::FetchError => e
          errors << Gem::SourceFetchProblem.new(source, e)
        else
          specs << [spec, source]
        end
      end

      if @errors
        @errors += errors
      else
        @errors = errors
      end

      set << specs

    rescue Gem::RemoteFetcher::FetchError => e
      # FIX if there is a problem talking to the network, we either need to always tell
      # the user (no really_verbose) or fail hard, not silently tell them that we just
      # couldn't find their requested gem.
      verbose do
        "Error fetching remote data:\t\t#{e.message}\n" \
          "Falling back to local-only install"
      end
      @domain = :local
    end
  end

  set
end

# File 'lib/rubygems/dependency_installer.rb', line 275

def find_spec_by_name_and_version(gem_name,
                                  version = Gem::Requirement.default,
                                  prerelease = false)
  set = Gem::AvailableSet.new

  if consider_local?
    if gem_name =~ /\.gem$/ and File.file? gem_name
      src = Gem::Source::SpecificFile.new(gem_name)
      set.add src.spec, src
    elsif gem_name =~ /\.gem$/
      Dir[gem_name].each do |name|
        begin
          src = Gem::Source::SpecificFile.new name
          set.add src.spec, src
        rescue Gem::Package::FormatError
        end
      end
    else
      local = Gem::Source::Local.new

      if s = local.find_gem(gem_name, version)
        set.add s, local
      end
    end
  end

  if set.empty?
    dep = Gem::Dependency.new gem_name, version
    dep.prerelease = true if prerelease

    set = find_gems_with_sources(dep, true)
    set.match_platform!
  end

  if set.empty?
    raise Gem::SpecificGemNotFoundException.new(gem_name, version, @errors)
  end

  @available = set
end

# File 'lib/rubygems/dependency_installer.rb', line 322

def gather_dependencies # :nodoc:
  specs = @available.all_specs

  # these gems were listed by the user, always install them
  keep_names = specs.map { |spec| spec.full_name }

  if @dev_shallow
    @toplevel_specs = keep_names
  end

  dependency_list = Gem::DependencyList.new @development
  dependency_list.add(*specs)
  to_do = specs.dup
  add_found_dependencies to_do, dependency_list unless @ignore_dependencies

  # REFACTOR maybe abstract away using Gem::Specification.include? so
  # that this isn't dependent only on the currently installed gems
  dependency_list.specs.reject! { |spec|
    not keep_names.include?(spec.full_name) and
    Gem::Specification.include?(spec)
  }

  unless dependency_list.ok? or @ignore_dependencies or @force
    reason = dependency_list.why_not_ok?.map { |k,v|
      "#{k} requires #{v.join(", ")}"
    }.join("; ")
    raise Gem::DependencyError, "Unable to resolve dependencies: #{reason}"
  end

  @gems_to_install = dependency_list.dependency_order.reverse
end

# File 'lib/rubygems/dependency_installer.rb', line 355

def in_background(what) # :nodoc:
  fork_happened = false
  if @build_docs_in_background and Process.respond_to?(:fork)
    begin
      Process.fork do
        yield
      end
      fork_happened = true
      say "#{what} in a background process."
    rescue NotImplementedError
    end
  end
  yield unless fork_happened
end

# File 'lib/rubygems/dependency_installer.rb', line 384

def install(dep_or_name, version = Gem::Requirement.default)
  request_set = resolve_dependencies dep_or_name, version

  @installed_gems = []

  options = {
    :bin_dir             => @bin_dir,
    :build_args          => @build_args,
    :document            => @document,
    :env_shebang         => @env_shebang,
    :force               => @force,
    :format_executable   => @format_executable,
    :ignore_dependencies => @ignore_dependencies,
    :prerelease          => @prerelease,
    :security_policy     => @security_policy,
    :user_install        => @user_install,
    :wrappers            => @wrappers,
    :build_root          => @build_root,
    :install_as_default  => @install_as_default,
    :dir_mode            => @dir_mode,
    :data_mode           => @data_mode,
    :prog_mode           => @prog_mode,
  }
  options[:install_dir] = @install_dir if @only_install_dir

  request_set.install options do |_, installer|
    @installed_gems << installer.spec if installer
  end

  @installed_gems.sort!

  # Since this is currently only called for docs, we can be lazy and just say
  # it's documentation. Ideally the hook adder could decide whether to be in
  # the background or not, and what to call it.
  in_background "Installing documentation" do
    Gem.done_installing_hooks.each do |hook|
      hook.call self, @installed_gems
    end
  end unless Gem.done_installing_hooks.empty?

  @installed_gems
end

# File 'lib/rubygems/dependency_installer.rb', line 427

def install_development_deps # :nodoc:
  if @development and @dev_shallow
    :shallow
  elsif @development
    :all
  else
    :none
  end
end

# File 'lib/rubygems/dependency_installer.rb', line 437

def resolve_dependencies(dep_or_name, version) # :nodoc:
  request_set = Gem::RequestSet.new
  request_set.development         = @development
  request_set.development_shallow = @dev_shallow
  request_set.soft_missing = @force
  request_set.prerelease = @prerelease
  request_set.remote = false unless consider_remote?

  installer_set = Gem::Resolver::InstallerSet.new @domain
  installer_set.ignore_installed = @only_install_dir

  if consider_local?
    if dep_or_name =~ /\.gem$/ and File.file? dep_or_name
      src = Gem::Source::SpecificFile.new dep_or_name
      installer_set.add_local dep_or_name, src.spec, src
      version = src.spec.version if version == Gem::Requirement.default
    elsif dep_or_name =~ /\.gem$/
      Dir[dep_or_name].each do |name|
        begin
          src = Gem::Source::SpecificFile.new name
          installer_set.add_local dep_or_name, src.spec, src
        rescue Gem::Package::FormatError
        end
      end
      # else This is a dependency. InstallerSet handles this case
    end
  end

  dependency =
    if spec = installer_set.local?(dep_or_name)
      Gem::Dependency.new spec.name, version
    elsif String === dep_or_name
      Gem::Dependency.new dep_or_name, version
    else
      dep_or_name
    end

  dependency.prerelease = @prerelease

  request_set.import [dependency]

  installer_set.add_always_install dependency

  request_set.always_install = installer_set.always_install

  if @ignore_dependencies
    installer_set.ignore_dependencies = true
    request_set.ignore_dependencies   = true
    request_set.soft_missing          = true
  end

  request_set.resolve installer_set

  @errors.concat request_set.errors

  request_set
end