Enable optional commands; Add printHelp function
#25
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The 'command' field of a Flags struct can now be a '?union' in addition to a plain 'union'.
Since 'parse' no longer returns an error, and instead exits directly, be helpful by printing the active Help menu after the error message, for context on where the error came from and what options exist.
I think I was overflowing the write buffer w/o more frequent flushing
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This allows the
command: unionfield of a Flags struct to becommand: ?unionto make subcommands optional. An example demonstrating its use has been added as well.An additional function,
printHelp, has been added to the rootflagsmodule to allow users to more easily print help / usage in cases other than parsing errors.