Print usage if no command specified

openresty / opm

OpenResty Package Manager

https://opm.openresty.org/

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Closed tisonkun closed 4 years ago

tisonkun commented 4 years ago

It seems more desirable to print usage when user doesn't specify command instead of a error message without hint.

cc @agentzh

doujiang24 commented 4 years ago

@TisonKun thanks, I'm on your side.

tisonkun commented 4 years ago

Thanks for reviewing and meriging!