1 files changed, 71 insertions, 0 deletions
diff --git a/lib/rubygems/vendor/optparse/lib/optparse/version.rb b/lib/rubygems/vendor/optparse/lib/optparse/version.rb
new file mode 100644
index 0000000000..5d79e9db44
--- /dev/null
+++ b/lib/rubygems/vendor/optparse/lib/optparse/version.rb
@@ -0,0 +1,71 @@
+# frozen_string_literal: false
+# Gem::OptionParser internal utility
+
+class << Gem::OptionParser
+  def show_version(*pkgs)
+    progname = ARGV.options.program_name
+    result = false
+    show = proc do |klass, cname, version|
+      str = "#{progname}"
+      unless klass == ::Object and cname == :VERSION
+        version = version.join(".") if Array === version
+        str << ": #{klass}" unless klass == Object
+        str << " version #{version}"
+      end
+      [:Release, :RELEASE].find do |rel|
+        if klass.const_defined?(rel)
+          str << " (#{klass.const_get(rel)})"
+        end
+      end
+      puts str
+      result = true
+    end
+    if pkgs.size == 1 and pkgs[0] == "all"
+      self.search_const(::Object, /\AV(?:ERSION|ersion)\z/) do |klass, cname, version|
+        unless cname[1] == ?e and klass.const_defined?(:Version)
+          show.call(klass, cname.intern, version)
+        end
+      end
+    else
+      pkgs.each do |pkg|
+        begin
+          pkg = pkg.split(/::|\//).inject(::Object) {|m, c| m.const_get(c)}
+          v = case
+              when pkg.const_defined?(:Version)
+                pkg.const_get(n = :Version)
+              when pkg.const_defined?(:VERSION)
+                pkg.const_get(n = :VERSION)
+              else
+                n = nil
+                "unknown"
+              end
+          show.call(pkg, n, v)
+        rescue NameError
+        end
+      end
+    end
+    result
+  end
+
+  def each_const(path, base = ::Object)
+    path.split(/::|\//).inject(base) do |klass, name|
+      raise NameError, path unless Module === klass
+      klass.constants.grep(/#{name}/i) do |c|
+        klass.const_defined?(c) or next
+        klass.const_get(c)
+      end
+    end
+  end
+
+  def search_const(klass, name)
+    klasses = [klass]
+    while klass = klasses.shift
+      klass.constants.each do |cname|
+        klass.const_defined?(cname) or next
+        const = klass.const_get(cname)
+        yield klass, cname, const if name === cname
+        klasses << const if Module === const and const != ::Object
+      end
+    end
+  end
+end