Mark commands (and flags) as hidden about cli HOT 5 CLOSED

I'll get started on this soon.

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@mitchellh What are you thinking of doing? Another filter function? It may be nice to just have simple structs that define commands/flags that can be passed in and these have options on them, like hiding them that would effect auto-complete and normal help output.

Would make it possible to add interfaces on them so that help could be auto-generated etc. Having flag sets attached to the command would be nice. Auto-complete will need to parse flags as well so everyone will need to hack together separate solutions at this point.

I believe @sethvargo has some nice flags structs in a Vault PR.

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I'm not planning on touching flags at all, this is just a command-level thing to hide from the help map and the autocomplete map.

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@mitchellh Understood. Was just suggesting it may be worth taking another look at this now that all the tools are building slightly separate solutions arounds help output/flags/autocomplete/etc

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I don't think this will affect that, since hidden/not hidden will always be a parent feature you'd want over fine tuning help output. I think flags should be taken a look at as soon as we look at help more seriously since those are tied together.

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