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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
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Example of overriding the magic bool behavior
$ custom-bool --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser
USAGE:
custom-bool[EXE] [OPTIONS] --foo <FOO> <BOOM>
ARGS:
<BOOM> [possible values: true, false]
OPTIONS:
--bar <BAR> [default: false]
--foo <FOO> [possible values: true, false]
-h, --help Print help information
-V, --version Print version information
$ custom-bool
? failed
error: The following required arguments were not provided:
--foo <FOO>
<BOOM>
USAGE:
custom-bool[EXE] [OPTIONS] --foo <FOO> <BOOM>
For more information try --help
$ custom-bool --foo true false
[examples/derive_ref/custom-bool.rs:31] opt = Opt {
foo: true,
bar: false,
boom: false,
}
$ custom-bool --foo true --bar true false
[examples/derive_ref/custom-bool.rs:31] opt = Opt {
foo: true,
bar: true,
boom: false,
}