mirror of
https://github.com/clap-rs/clap
synced 2024-12-15 07:12:32 +00:00
6cc76e7237
While having convinience derives can be helpful, deriving traits that are not used in similar situations (`Clap` and `ArgEnum`) can make things harder - From a user, derives are opaque and create uncertainty on how to use the API if not kept crystal clear (deriving a name gives you the trait by that name) - This makes documentation harder to write and read - You can use types in unintended places, which is made worse for crate APIs because changing this breaks compatibility. Fixes #2584
25 lines
452 B
Rust
25 lines
452 B
Rust
//! Usage example of `arg_enum`
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//!
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//! All the variants of the enum and the enum itself support `rename_all`
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use clap::{ArgEnum, Clap};
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#[derive(ArgEnum, Debug, PartialEq)]
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enum ArgChoice {
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Foo,
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Bar,
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// Aliases are supported
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#[clap(alias = "b", alias = "z")]
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Baz,
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}
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#[derive(Clap, PartialEq, Debug)]
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struct Opt {
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#[clap(arg_enum)]
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arg: ArgChoice,
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}
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fn main() {
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let opt = Opt::parse();
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println!("{:#?}", opt);
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}
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