Hybrid flag/option

[sasq64]

I would like to have support for options that can act as flags if no argument is given.
These options would require the forms -Xsomething or --longer=something when used as options.

opts.add_hybrid_option("--sign", stringValue, "Sign archive with specified key or default if none given", "defaultKey");

if(stringValue != "") {
  // Perfom signing
}

Should print help text such as;
--sign[=TEXT]

[henryiii]

Just thinking:

This is almost possible currently if you set the min/max allowed options to 0/1, respectively. The requirement of the special forms could be added as an "allowed forms" type option, with flags. Something like: ->allowed_short_form(CLI::NoSpace)->allowed_long_form(CLI::Equals).

[henryiii]

This is now possible!