Merge bundler to standard libraries.

  rubygems 2.7.x depends bundler-1.15.x. This is preparation for
  rubygems and bundler migration.

  * lib/bundler.rb, lib/bundler/*: files of bundler-1.15.4
  * spec/bundler/*: rspec examples of bundler-1.15.4. I applied patches.
    * https://github.com/bundler/bundler/pull/6007
    * Exclude not working examples on ruby repository.
    * Fake ruby interpriter instead of installed ruby.
  * Makefile.in: Added test task named `test-bundler`. This task is only
    working macOS/linux yet. I'm going to support Windows environment later.
  * tool/sync_default_gems.rb: Added sync task for bundler.

  [Feature #12733][ruby-core:77172]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59779 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 46 insertions, 0 deletions

diff --git a/lib/bundler/dep_proxy.rb b/lib/bundler/dep_proxy.rb
new file mode 100644
index 0000000000..998975bbaf
--- /dev/null
+++ b/lib/bundler/dep_proxy.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+module Bundler
+  class DepProxy
+    attr_reader :__platform, :dep
+
+    def initialize(dep, platform)
+      @dep = dep
+      @__platform = platform
+    end
+
+    def hash
+      @hash ||= dep.hash
+    end
+
+    def ==(other)
+      dep == other.dep && __platform == other.__platform
+    end
+
+    alias_method :eql?, :==
+
+    def type
+      @dep.type
+    end
+
+    def name
+      @dep.name
+    end
+
+    def requirement
+      @dep.requirement
+    end
+
+    def to_s
+      s = name.dup
+      s << " (#{requirement})" unless requirement == Gem::Requirement.default
+      s << " #{__platform}" unless __platform == Gem::Platform::RUBY
+      s
+    end
+
+  private
+
+    def method_missing(*args, &blk)
+      @dep.send(*args, &blk)
+    end
+  end
+end