optparse/kwargs.rb

* lib/optparse/kwargs.rb (OptionParser#define_by_keywords):
  [EXPERIMENTAL] extract command line option definitions from the
  information of keyword arguments.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56423 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/optparse/kwargs.rb b/lib/optparse/kwargs.rb
new file mode 100644
index 0000000000..ed58cc142b
--- /dev/null
+++ b/lib/optparse/kwargs.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+require 'optparse'
+
+class OptionParser
+  def define_by_keywords(options, meth, **opts)
+    meth.parameters.each do |type, name|
+      case type
+      when :key, :keyreq
+        op, cl = *(type == :key ? %w"[ ]" : ["", ""])
+        define("--#{name}=#{op}#{name.upcase}#{cl}", *opts[name]) do |o|
+          options[name] = o
+        end
+      end
+    end
+    options
+  end
+end