Added bundler as default gems. Revisit [Feature #12733]

  * bin/*, lib/bundler/*, lib/bundler.rb, spec/bundler, man/*:
    Merge from latest stable branch of bundler/bundler repository and
    added workaround patches. I will backport them into upstream.
  * common.mk, defs/gmake.mk: Added `test-bundler` task for test suite
    of bundler.
  * tool/sync_default_gems.rb: Added sync task for bundler.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65509 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

9 files changed, 632 insertions, 0 deletions

diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/action.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/action.rb
new file mode 100644
index 0000000000..c04c7eec9c
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/action.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+module Bundler::Molinillo
+  class DependencyGraph
+    # An action that modifies a {DependencyGraph} that is reversible.
+    # @abstract
+    class Action
+      # rubocop:disable Lint/UnusedMethodArgument
+
+      # @return [Symbol] The name of the action.
+      def self.action_name
+        raise 'Abstract'
+      end
+
+      # Performs the action on the given graph.
+      # @param  [DependencyGraph] graph the graph to perform the action on.
+      # @return [Void]
+      def up(graph)
+        raise 'Abstract'
+      end
+
+      # Reverses the action on the given graph.
+      # @param  [DependencyGraph] graph the graph to reverse the action on.
+      # @return [Void]
+      def down(graph)
+        raise 'Abstract'
+      end
+
+      # @return [Action,Nil] The previous action
+      attr_accessor :previous
+
+      # @return [Action,Nil] The next action
+      attr_accessor :next
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb
new file mode 100644
index 0000000000..9849aea2fe
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular.rb
@@ -0,0 +1,66 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # (see DependencyGraph#add_edge_no_circular)
+    class AddEdgeNoCircular < Action
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :add_vertex
+      end
+
+      # (see Action#up)
+      def up(graph)
+        edge = make_edge(graph)
+        edge.origin.outgoing_edges << edge
+        edge.destination.incoming_edges << edge
+        edge
+      end
+
+      # (see Action#down)
+      def down(graph)
+        edge = make_edge(graph)
+        delete_first(edge.origin.outgoing_edges, edge)
+        delete_first(edge.destination.incoming_edges, edge)
+      end
+
+      # @!group AddEdgeNoCircular
+
+      # @return [String] the name of the origin of the edge
+      attr_reader :origin
+
+      # @return [String] the name of the destination of the edge
+      attr_reader :destination
+
+      # @return [Object] the requirement that the edge represents
+      attr_reader :requirement
+
+      # @param  [DependencyGraph] graph the graph to find vertices from
+      # @return [Edge] The edge this action adds
+      def make_edge(graph)
+        Edge.new(graph.vertex_named(origin), graph.vertex_named(destination), requirement)
+      end
+
+      # Initialize an action to add an edge to a dependency graph
+      # @param [String] origin the name of the origin of the edge
+      # @param [String] destination the name of the destination of the edge
+      # @param [Object] requirement the requirement that the edge represents
+      def initialize(origin, destination, requirement)
+        @origin = origin
+        @destination = destination
+        @requirement = requirement
+      end
+
+      private
+
+      def delete_first(array, item)
+        return unless index = array.index(item)
+        array.delete_at(index)
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
new file mode 100644
index 0000000000..0a1e08255b
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex.rb
@@ -0,0 +1,62 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # (see DependencyGraph#add_vertex)
+    class AddVertex < Action # :nodoc:
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :add_vertex
+      end
+
+      # (see Action#up)
+      def up(graph)
+        if existing = graph.vertices[name]
+          @existing_payload = existing.payload
+          @existing_root = existing.root
+        end
+        vertex = existing || Vertex.new(name, payload)
+        graph.vertices[vertex.name] = vertex
+        vertex.payload ||= payload
+        vertex.root ||= root
+        vertex
+      end
+
+      # (see Action#down)
+      def down(graph)
+        if defined?(@existing_payload)
+          vertex = graph.vertices[name]
+          vertex.payload = @existing_payload
+          vertex.root = @existing_root
+        else
+          graph.vertices.delete(name)
+        end
+      end
+
+      # @!group AddVertex
+
+      # @return [String] the name of the vertex
+      attr_reader :name
+
+      # @return [Object] the payload for the vertex
+      attr_reader :payload
+
+      # @return [Boolean] whether the vertex is root or not
+      attr_reader :root
+
+      # Initialize an action to add a vertex to a dependency graph
+      # @param [String] name the name of the vertex
+      # @param [Object] payload the payload for the vertex
+      # @param [Boolean] root whether the vertex is root or not
+      def initialize(name, payload, root)
+        @name = name
+        @payload = payload
+        @root = root
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge.rb
new file mode 100644
index 0000000000..1d9f4b327d
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # (see DependencyGraph#delete_edge)
+    class DeleteEdge < Action
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :delete_edge
+      end
+
+      # (see Action#up)
+      def up(graph)
+        edge = make_edge(graph)
+        edge.origin.outgoing_edges.delete(edge)
+        edge.destination.incoming_edges.delete(edge)
+      end
+
+      # (see Action#down)
+      def down(graph)
+        edge = make_edge(graph)
+        edge.origin.outgoing_edges << edge
+        edge.destination.incoming_edges << edge
+        edge
+      end
+
+      # @!group DeleteEdge
+
+      # @return [String] the name of the origin of the edge
+      attr_reader :origin_name
+
+      # @return [String] the name of the destination of the edge
+      attr_reader :destination_name
+
+      # @return [Object] the requirement that the edge represents
+      attr_reader :requirement
+
+      # @param  [DependencyGraph] graph the graph to find vertices from
+      # @return [Edge] The edge this action adds
+      def make_edge(graph)
+        Edge.new(
+          graph.vertex_named(origin_name),
+          graph.vertex_named(destination_name),
+          requirement
+        )
+      end
+
+      # Initialize an action to add an edge to a dependency graph
+      # @param [String] origin_name the name of the origin of the edge
+      # @param [String] destination_name the name of the destination of the edge
+      # @param [Object] requirement the requirement that the edge represents
+      def initialize(origin_name, destination_name, requirement)
+        @origin_name = origin_name
+        @destination_name = destination_name
+        @requirement = requirement
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb
new file mode 100644
index 0000000000..385dcbdd06
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/detach_vertex_named.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # @see DependencyGraph#detach_vertex_named
+    class DetachVertexNamed < Action
+      # @!group Action
+
+      # (see Action#name)
+      def self.action_name
+        :add_vertex
+      end
+
+      # (see Action#up)
+      def up(graph)
+        return [] unless @vertex = graph.vertices.delete(name)
+
+        removed_vertices = [@vertex]
+        @vertex.outgoing_edges.each do |e|
+          v = e.destination
+          v.incoming_edges.delete(e)
+          if !v.root? && v.incoming_edges.empty?
+            removed_vertices.concat graph.detach_vertex_named(v.name)
+          end
+        end
+
+        @vertex.incoming_edges.each do |e|
+          v = e.origin
+          v.outgoing_edges.delete(e)
+        end
+
+        removed_vertices
+      end
+
+      # (see Action#down)
+      def down(graph)
+        return unless @vertex
+        graph.vertices[@vertex.name] = @vertex
+        @vertex.outgoing_edges.each do |e|
+          e.destination.incoming_edges << e
+        end
+        @vertex.incoming_edges.each do |e|
+          e.origin.outgoing_edges << e
+        end
+      end
+
+      # @!group DetachVertexNamed
+
+      # @return [String] the name of the vertex to detach
+      attr_reader :name
+
+      # Initialize an action to detach a vertex from a dependency graph
+      # @param [String] name the name of the vertex to detach
+      def initialize(name)
+        @name = name
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/log.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/log.rb
new file mode 100644
index 0000000000..8582dd19c1
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/log.rb
@@ -0,0 +1,126 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_edge_no_circular'
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/add_vertex'
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/delete_edge'
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/detach_vertex_named'
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/set_payload'
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/tag'
+
+module Bundler::Molinillo
+  class DependencyGraph
+    # A log for dependency graph actions
+    class Log
+      # Initializes an empty log
+      def initialize
+        @current_action = @first_action = nil
+      end
+
+      # @!macro [new] action
+      #   {include:DependencyGraph#$0}
+      #   @param [Graph] graph the graph to perform the action on
+      #   @param (see DependencyGraph#$0)
+      #   @return (see DependencyGraph#$0)
+
+      # @macro action
+      def tag(graph, tag)
+        push_action(graph, Tag.new(tag))
+      end
+
+      # @macro action
+      def add_vertex(graph, name, payload, root)
+        push_action(graph, AddVertex.new(name, payload, root))
+      end
+
+      # @macro action
+      def detach_vertex_named(graph, name)
+        push_action(graph, DetachVertexNamed.new(name))
+      end
+
+      # @macro action
+      def add_edge_no_circular(graph, origin, destination, requirement)
+        push_action(graph, AddEdgeNoCircular.new(origin, destination, requirement))
+      end
+
+      # {include:DependencyGraph#delete_edge}
+      # @param [Graph] graph the graph to perform the action on
+      # @param [String] origin_name
+      # @param [String] destination_name
+      # @param [Object] requirement
+      # @return (see DependencyGraph#delete_edge)
+      def delete_edge(graph, origin_name, destination_name, requirement)
+        push_action(graph, DeleteEdge.new(origin_name, destination_name, requirement))
+      end
+
+      # @macro action
+      def set_payload(graph, name, payload)
+        push_action(graph, SetPayload.new(name, payload))
+      end
+
+      # Pops the most recent action from the log and undoes the action
+      # @param [DependencyGraph] graph
+      # @return [Action] the action that was popped off the log
+      def pop!(graph)
+        return unless action = @current_action
+        unless @current_action = action.previous
+          @first_action = nil
+        end
+        action.down(graph)
+        action
+      end
+
+      extend Enumerable
+
+      # @!visibility private
+      # Enumerates each action in the log
+      # @yield [Action]
+      def each
+        return enum_for unless block_given?
+        action = @first_action
+        loop do
+          break unless action
+          yield action
+          action = action.next
+        end
+        self
+      end
+
+      # @!visibility private
+      # Enumerates each action in the log in reverse order
+      # @yield [Action]
+      def reverse_each
+        return enum_for(:reverse_each) unless block_given?
+        action = @current_action
+        loop do
+          break unless action
+          yield action
+          action = action.previous
+        end
+        self
+      end
+
+      # @macro action
+      def rewind_to(graph, tag)
+        loop do
+          action = pop!(graph)
+          raise "No tag #{tag.inspect} found" unless action
+          break if action.class.action_name == :tag && action.tag == tag
+        end
+      end
+
+      private
+
+      # Adds the given action to the log, running the action
+      # @param [DependencyGraph] graph
+      # @param [Action] action
+      # @return The value returned by `action.up`
+      def push_action(graph, action)
+        action.previous = @current_action
+        @current_action.next = action if @current_action
+        @current_action = action
+        @first_action ||= action
+        action.up(graph)
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/set_payload.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/set_payload.rb
new file mode 100644
index 0000000000..37286d104a
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/set_payload.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # @see DependencyGraph#set_payload
+    class SetPayload < Action # :nodoc:
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :set_payload
+      end
+
+      # (see Action#up)
+      def up(graph)
+        vertex = graph.vertex_named(name)
+        @old_payload = vertex.payload
+        vertex.payload = payload
+      end
+
+      # (see Action#down)
+      def down(graph)
+        graph.vertex_named(name).payload = @old_payload
+      end
+
+      # @!group SetPayload
+
+      # @return [String] the name of the vertex
+      attr_reader :name
+
+      # @return [Object] the payload for the vertex
+      attr_reader :payload
+
+      # Initialize an action to add set the payload for a vertex in a dependency
+      # graph
+      # @param [String] name the name of the vertex
+      # @param [Object] payload the payload for the vertex
+      def initialize(name, payload)
+        @name = name
+        @payload = payload
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/tag.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/tag.rb
new file mode 100644
index 0000000000..d6ad16e07a
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/tag.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'bundler/vendor/molinillo/lib/molinillo/dependency_graph/action'
+module Bundler::Molinillo
+  class DependencyGraph
+    # @!visibility private
+    # @see DependencyGraph#tag
+    class Tag < Action
+      # @!group Action
+
+      # (see Action.action_name)
+      def self.action_name
+        :tag
+      end
+
+      # (see Action#up)
+      def up(_graph)
+      end
+
+      # (see Action#down)
+      def down(_graph)
+      end
+
+      # @!group Tag
+
+      # @return [Object] An opaque tag
+      attr_reader :tag
+
+      # Initialize an action to tag a state of a dependency graph
+      # @param [Object] tag an opaque tag
+      def initialize(tag)
+        @tag = tag
+      end
+    end
+  end
+end
diff --git a/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/vertex.rb b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/vertex.rb
new file mode 100644
index 0000000000..7ecdc4b65a
--- /dev/null
+++ b/lib/bundler/vendor/molinillo/lib/molinillo/dependency_graph/vertex.rb
@@ -0,0 +1,136 @@
+# frozen_string_literal: true
+
+module Bundler::Molinillo
+  class DependencyGraph
+    # A vertex in a {DependencyGraph} that encapsulates a {#name} and a
+    # {#payload}
+    class Vertex
+      # @return [String] the name of the vertex
+      attr_accessor :name
+
+      # @return [Object] the payload the vertex holds
+      attr_accessor :payload
+
+      # @return [Array<Object>] the explicit requirements that required
+      #   this vertex
+      attr_reader :explicit_requirements
+
+      # @return [Boolean] whether the vertex is considered a root vertex
+      attr_accessor :root
+      alias root? root
+
+      # Initializes a vertex with the given name and payload.
+      # @param [String] name see {#name}
+      # @param [Object] payload see {#payload}
+      def initialize(name, payload)
+        @name = name.frozen? ? name : name.dup.freeze
+        @payload = payload
+        @explicit_requirements = []
+        @outgoing_edges = []
+        @incoming_edges = []
+      end
+
+      # @return [Array<Object>] all of the requirements that required
+      #   this vertex
+      def requirements
+        (incoming_edges.map(&:requirement) + explicit_requirements).uniq
+      end
+
+      # @return [Array<Edge>] the edges of {#graph} that have `self` as their
+      #   {Edge#origin}
+      attr_accessor :outgoing_edges
+
+      # @return [Array<Edge>] the edges of {#graph} that have `self` as their
+      #   {Edge#destination}
+      attr_accessor :incoming_edges
+
+      # @return [Array<Vertex>] the vertices of {#graph} that have an edge with
+      #   `self` as their {Edge#destination}
+      def predecessors
+        incoming_edges.map(&:origin)
+      end
+
+      # @return [Array<Vertex>] the vertices of {#graph} where `self` is a
+      #   {#descendent?}
+      def recursive_predecessors
+        vertices = predecessors
+        vertices += Compatibility.flat_map(vertices, &:recursive_predecessors)
+        vertices.uniq!
+        vertices
+      end
+
+      # @return [Array<Vertex>] the vertices of {#graph} that have an edge with
+      #   `self` as their {Edge#origin}
+      def successors
+        outgoing_edges.map(&:destination)
+      end
+
+      # @return [Array<Vertex>] the vertices of {#graph} where `self` is an
+      #   {#ancestor?}
+      def recursive_successors
+        vertices = successors
+        vertices += Compatibility.flat_map(vertices, &:recursive_successors)
+        vertices.uniq!
+        vertices
+      end
+
+      # @return [String] a string suitable for debugging
+      def inspect
+        "#{self.class}:#{name}(#{payload.inspect})"
+      end
+
+      # @return [Boolean] whether the two vertices are equal, determined
+      #   by a recursive traversal of each {Vertex#successors}
+      def ==(other)
+        return true if equal?(other)
+        shallow_eql?(other) &&
+          successors.to_set == other.successors.to_set
+      end
+
+      # @param  [Vertex] other the other vertex to compare to
+      # @return [Boolean] whether the two vertices are equal, determined
+      #   solely by {#name} and {#payload} equality
+      def shallow_eql?(other)
+        return true if equal?(other)
+        other &&
+          name == other.name &&
+          payload == other.payload
+      end
+
+      alias eql? ==
+
+      # @return [Fixnum] a hash for the vertex based upon its {#name}
+      def hash
+        name.hash
+      end
+
+      # Is there a path from `self` to `other` following edges in the
+      # dependency graph?
+      # @return true iff there is a path following edges within this {#graph}
+      def path_to?(other)
+        _path_to?(other)
+      end
+
+      alias descendent? path_to?
+
+      # @param [Vertex] other the vertex to check if there's a path to
+      # @param [Set<Vertex>] visited the vertices of {#graph} that have been visited
+      # @return [Boolean] whether there is a path to `other` from `self`
+      def _path_to?(other, visited = Set.new)
+        return false unless visited.add?(self)
+        return true if equal?(other)
+        successors.any? { |v| v._path_to?(other, visited) }
+      end
+      protected :_path_to?
+
+      # Is there a path from `other` to `self` following edges in the
+      # dependency graph?
+      # @return true iff there is a path following edges within this {#graph}
+      def ancestor?(other)
+        other.path_to?(self)
+      end
+
+      alias is_reachable_from? ancestor?
+    end
+  end
+end