OptionParser#define_by_keywords

define_by_keywords(options, method, **params)

# File tmp/rubies/ruby-3.3.0/lib/optparse/kwargs.rb, line 10
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

Creates an option from the given parameters params. See Parameters for New Options.

The block, if given, is the handler for the created option. When the option is encountered during command-line parsing, the block is called with the argument given for the option, if any. See Option Handlers.

See also #define #define_head #def_head_option #define_tail also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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