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, 85 insertions, 0 deletions

diff --git a/lib/bundler/current_ruby.rb b/lib/bundler/current_ruby.rb
new file mode 100644
index 0000000000..cca40100ad
--- /dev/null
+++ b/lib/bundler/current_ruby.rb
@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+module Bundler
+  # Returns current version of Ruby
+  #
+  # @return [CurrentRuby] Current version of Ruby
+  def self.current_ruby
+    @current_ruby ||= CurrentRuby.new
+  end
+
+  class CurrentRuby
+    KNOWN_MINOR_VERSIONS = %w(
+      1.8
+      1.9
+      2.0
+      2.1
+      2.2
+      2.3
+      2.4
+      2.5
+    ).freeze
+
+    KNOWN_MAJOR_VERSIONS = KNOWN_MINOR_VERSIONS.map {|v| v.split(".", 2).first }.uniq.freeze
+
+    KNOWN_PLATFORMS = %w(
+      jruby
+      maglev
+      mingw
+      mri
+      mswin
+      mswin64
+      rbx
+      ruby
+      x64_mingw
+    ).freeze
+
+    def ruby?
+      !mswin? && (!defined?(RUBY_ENGINE) || RUBY_ENGINE == "ruby" || RUBY_ENGINE == "rbx" || RUBY_ENGINE == "maglev")
+    end
+
+    def mri?
+      !mswin? && (!defined?(RUBY_ENGINE) || RUBY_ENGINE == "ruby")
+    end
+
+    def rbx?
+      ruby? && defined?(RUBY_ENGINE) && RUBY_ENGINE == "rbx"
+    end
+
+    def jruby?
+      defined?(RUBY_ENGINE) && RUBY_ENGINE == "jruby"
+    end
+
+    def maglev?
+      defined?(RUBY_ENGINE) && RUBY_ENGINE == "maglev"
+    end
+
+    def mswin?
+      Bundler::WINDOWS
+    end
+
+    def mswin64?
+      Bundler::WINDOWS && Bundler.local_platform != Gem::Platform::RUBY && Bundler.local_platform.os == "mswin64" && Bundler.local_platform.cpu == "x64"
+    end
+
+    def mingw?
+      Bundler::WINDOWS && Bundler.local_platform != Gem::Platform::RUBY && Bundler.local_platform.os == "mingw32" && Bundler.local_platform.cpu != "x64"
+    end
+
+    def x64_mingw?
+      Bundler::WINDOWS && Bundler.local_platform != Gem::Platform::RUBY && Bundler.local_platform.os == "mingw32" && Bundler.local_platform.cpu == "x64"
+    end
+
+    (KNOWN_MINOR_VERSIONS + KNOWN_MAJOR_VERSIONS).each do |version|
+      trimmed_version = version.tr(".", "")
+      define_method(:"on_#{trimmed_version}?") do
+        RUBY_VERSION.start_with?("#{version}.")
+      end
+
+      KNOWN_PLATFORMS.each do |platform|
+        define_method(:"#{platform}_#{trimmed_version}?") do
+          send(:"#{platform}?") && send(:"on_#{trimmed_version}?")
+        end
+      end
+    end
+  end
+end