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https://github.com/clap-rs/clap
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647896d929
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
30 lines
971 B
Rust
30 lines
971 B
Rust
use clap::{arg, Args as _, Command, FromArgMatches as _, Parser};
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#[derive(Parser, Debug)]
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struct DerivedArgs {
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#[clap(short, long, action)]
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derived: bool,
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}
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fn main() {
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let cli = Command::new("CLI").arg(arg!(-b - -built).action(clap::ArgAction::SetTrue));
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// Augment built args with derived args
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let cli = DerivedArgs::augment_args(cli);
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let matches = cli.get_matches();
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println!(
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"Value of built: {:?}",
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*matches.get_one::<bool>("built").unwrap()
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);
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println!(
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"Value of derived via ArgMatches: {:?}",
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*matches.get_one::<bool>("derived").unwrap()
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);
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// Since DerivedArgs implements FromArgMatches, we can extract it from the unstructured ArgMatches.
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// This is the main benefit of using derived arguments.
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let derived_matches = DerivedArgs::from_arg_matches(&matches)
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.map_err(|err| err.exit())
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.unwrap();
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println!("Value of derived: {:#?}", derived_matches);
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}
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