gio:application-set-option-context-parameter-string (application parameter)

application -- a g:application instance
parameter -- a string which is displayed in the first line of --help output

Sets the parameter string to be used by the command line handling of the application. This function registers the argument to be passed to the g:option-context-new function when the internal g:option-context instance of the application is created.

See the g:option-context-new function for more information about the parameter argument.