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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
27 lines
744 B
Rust
27 lines
744 B
Rust
// Note: this requires the `derive` feature
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use clap::Parser;
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#[derive(Parser)]
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#[clap(author, version, about, long_about = None)]
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struct Cli {
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#[clap(short = 'f', action)]
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eff: bool,
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#[clap(short = 'p', value_name = "PEAR", value_parser)]
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pea: Option<String>,
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#[clap(last = true, value_parser)]
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slop: Vec<String>,
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}
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fn main() {
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let args = Cli::parse();
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// This is what will happen with `myprog -f -p=bob -- sloppy slop slop`...
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println!("-f used: {:?}", args.eff); // -f used: true
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println!("-p's value: {:?}", args.pea); // -p's value: Some("bob")
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println!("'slops' values: {:?}", args.slop); // 'slops' values: Some(["sloppy", "slop", "slop"])
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// Continued program logic goes here...
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}
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