mirror of
https://github.com/clap-rs/clap
synced 2024-12-13 22:32:33 +00:00
d840d5650e
Before #2005, `Clap` was a special trait that derived all clap traits it detected were relevant (including an enum getting both `ArgEnum`, `Clap`, and `Subcommand`). Now, we have elevated `Clap`, `Args`, `Subcommand`, and `ArgEnum` to be user facing but the name `Clap` isn't very descriptive. This also helps further clarify the relationships so a crate providing an item to be `#[clap(flatten)]` or `#[clap(subcommand)]` is more likely to choose the needed trait to derive. Also, my proposed fix fo #2785 includes making `App` attributes almost exclusively for `Clap`. Clarifying the names/roles will help communicate this. For prior discussion, see #2583
48 lines
856 B
Rust
48 lines
856 B
Rust
use clap::Parser;
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#[derive(Parser, PartialEq, Debug)]
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struct Opt {
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#[clap(subcommand)]
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sub: Box<Sub>,
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}
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#[derive(Parser, PartialEq, Debug)]
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enum Sub {
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Flame {
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#[clap(flatten)]
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arg: Box<Ext>,
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},
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}
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#[derive(Parser, PartialEq, Debug)]
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struct Ext {
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arg: u32,
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}
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#[test]
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fn boxed_flatten_subcommand() {
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assert_eq!(
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Opt {
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sub: Box::new(Sub::Flame {
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arg: Box::new(Ext { arg: 1 })
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})
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},
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Opt::parse_from(&["test", "flame", "1"])
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);
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}
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#[test]
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fn update_boxed_flatten_subcommand() {
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let mut opt = Opt::parse_from(&["test", "flame", "1"]);
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opt.update_from(&["test", "flame", "42"]);
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assert_eq!(
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Opt {
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sub: Box::new(Sub::Flame {
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arg: Box::new(Ext { arg: 42 })
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})
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},
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opt
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);
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}
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