feat(builder): Set/Append Actions #3777
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This round out the new style actions and allow us to start deprecating occurrences. As part of an effort to unify code paths, this does change flag parsing to do splits. This will only be a problem if the user enables splits but we'll at least not crash. Once we also address clap-rs#3776, we'll be able to have envs all work the same.
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Jun 6, 2022
This is the derive support for clap-rs#3774 (see also clap-rs#3775, clap-rs#3777) This combined with `value_parser` replaces `parser`. The main frustration with this is that `ArgAction::Count` (the replacement for `parse(from_occurrences)` must be a `u64`. We could come up with a magic attribute that is meant to be the value parser's parsed type. We could then use `TryFrom` to convert the parsed type to the user's type to allow more. That is an exercise for the future. Alternatively, we have clap-rs#3792. Prep for this included - clap-rs#3782 - clap-rs#3783 - clap-rs#3786 - clap-rs#3789 - clap-rs#3793
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This round out the new style actions and allow us to start deprecating
occurrences.
As part of an effort to unify code paths, this does change flag parsing
to do splits. This will only be a problem if the user enables splits
but we'll at least not crash. Once we also address #3776, we'll be able
to have envs all work the same.