1 files changed, 27 insertions, 0 deletions
diff --git a/lib/optparse/kwargs.rb b/lib/optparse/kwargs.rb
new file mode 100644
index 0000000000..59a2f61544
--- /dev/null
+++ b/lib/optparse/kwargs.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+require_relative '../optparse'
+
+class OptionParser
+  # :call-seq:
+  #   define_by_keywords(options, method, **params)
+  #
+  # :include: ../../doc/optparse/creates_option.rdoc
+  #
+  # Defines options which set in to _options_ for keyword parameters
+  # of _method_.
+  #
+  # Parameters for each keywords are given as elements of _params_.
+  #
+  def define_by_keywords(options, method, **params)
+    method.parameters.each do |type, name|
+      case type
+      when :key, :keyreq
+        op, cl = *(type == :key ? %w"[ ]" : ["", ""])
+        define("--#{name}=#{op}#{name.upcase}#{cl}", *params[name]) do |o|
+          options[name] = o
+        end
+      end
+    end
+    options
+  end
+end