Fix usage writing when using custom version flag #224
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Hi @alexflint , this is a small follow-up to PR #223 :)
I realized that I forgot to update the write usage function, and it was still printing the output of
Version()
even if a custom--version
flag spec is present in the arguments. This is now also fixed and I added more unit tests for help/usage writing.I also took the opportunity to improve a bit the way version flag specs are scanned for both usage and help writing.
I belive that this PR now fully addresses issue #171 because, when using a custom
--version
flag, the builtin version string (if any) is not printed anymore in usage and errors.Fixes #171