"gomplate -in flibbit" should produce an error about gomplate HOT 6 CLOSED

@hairyhenderson this looks to have a quick fix so I submitted PR #208 that registers cobra.NoArgs for the rootCmd as mentioned by @docwhat earlier #192 (comment)

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Thanks for reporting this, @docwhat! I agree - that's a bit odd. This used to be the case, but I think additional args are silently ignored ever since I moved to using cobra for parsing args.

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When I was using kingpin I had a similar problem; I was not checking all the error conditions.

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Reading the docs on arguments, I think what you want is a line in the RootCmd section saying something like:

...
Args: NoArgs,
...

But I'm not sure, since I'm just speed reading the docs and change history of cobra.

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@hairyhenderson

P.S. For macOS users Homebrew/homebrew-core#15811

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thanks @docwhat - I already have a tap at https://github.com/hairyhenderson/homebrew-tap, but being in core would be cool!

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