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instance method
OptionParser#def_head_option
def_head_option(*opts, &block)
lib/optparse.rb
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# File tmp/rubies/ruby-3.1.3/lib/optparse.rb, line 1484
def define_head(*opts, &block)
top.prepend(*(sw = make_switch(opts, block)))
sw[0]
end
Alias of #define_head
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.