If there is no command in the argument list, the run command is returned
by default.
If the --help argument previously handled by prepareOptions,
this.options.help is already true, with this returning the requested
command. If no command was requested (just dub --help) this returns the
help command.
Get an instance of the requested command.
If there is no command in the argument list, the run command is returned by default.
If the --help argument previously handled by prepareOptions, this.options.help is already true, with this returning the requested command. If no command was requested (just dub --help) this returns the help command.