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This is the derive support for #3774 (see also #3775, #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 #3792. Prep for this included - #3782 - #3783 - #3786 - #3789 - #3793
47 lines
995 B
Markdown
47 lines
995 B
Markdown
*Jump to [source](custom-bool.rs)*
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Example of overriding the magic `bool` behavior
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```console
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$ custom-bool --help
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clap [..]
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A simple to use, efficient, and full-featured Command Line Argument Parser
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USAGE:
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custom-bool[EXE] [OPTIONS] --foo <FOO> <BOOM>
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ARGS:
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<BOOM> [possible values: true, false]
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OPTIONS:
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--bar <BAR> [default: false]
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--foo <FOO> [possible values: true, false]
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-h, --help Print help information
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-V, --version Print version information
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$ custom-bool
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? failed
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error: The following required arguments were not provided:
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--foo <FOO>
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<BOOM>
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USAGE:
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custom-bool[EXE] [OPTIONS] --foo <FOO> <BOOM>
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For more information try --help
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$ custom-bool --foo true false
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[examples/derive_ref/custom-bool.rs:31] opt = Opt {
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foo: true,
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bar: false,
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boom: false,
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}
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$ custom-bool --foo true --bar true false
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[examples/derive_ref/custom-bool.rs:31] opt = Opt {
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foo: true,
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bar: true,
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boom: false,
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}
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```
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