Comply with docopt / POSIX POSIX.1-2017 12.1 Utility Argument Syntax

[HaleTom]

The +options are "unique". Most shells use -o thing --longoption -- arg1 arg2 where -- marks the end of options.

Would you consider complying with POSIX 12.1 Utility Argument Syntax or perhaps easier, the python docopt which is largly POSIX compliant.

Besides principle of least surprise, docopt compliance brings extra goodies like automatic bash/zsh completion generation.

For community:
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[anki-code]

hi @HaleTom !

The xxh is using the plus sign for the xxh arguments to save the ability to use the minus sign for the original ssh (or another tool) arguments. This allows just replace the first two letters in the ssh command to convert it to the xxh command:

ssh -i ~/mykey user@host
xxh -i ~/mykey user@host
xxh -i ~/mykey user@host +s xonsh