mirror of
https://github.com/clap-rs/clap
synced 2024-12-14 14:52:33 +00:00
bfa02fd418
This ports our example testing over to [trycmd](https://docs.rs/) so we can: - More thoroughly test our examples - Provide always-up-to-date example usage The old way of testing automatically picked up examples. This new way requires we have a `.md` file that uses the example in some way. Notes: - Moved overall example description to the `.md` file - I added cross-linking between related examples - `14_groups` had a redundant paragraph (twice talked about "one and only one"
28 lines
1.1 KiB
Rust
28 lines
1.1 KiB
Rust
use clap::{arg, App, AppSettings};
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fn main() {
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let matches = App::new("myapp")
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.setting(AppSettings::SubcommandsNegateReqs)
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// Negates requirement of parent command.
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.arg(arg!(<input> "input file to use"))
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// Required positional argument called input. This
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// will be only required if subcommand is not present.
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.subcommand(App::new("test").about("does some testing"))
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// if program is invoked with subcommand, you do not
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// need to specify the <input> argument anymore due to
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// the AppSettings::SubcommandsNegateReqs setting.
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.get_matches();
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// Calling unwrap() on "input" would not be advised here, because although it's required,
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// if the user uses a subcommand, those requirements are no longer required. Hence, we should
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// use some sort of 'if let' construct
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if let Some(inp) = matches.value_of("input") {
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println!("The input file is: {}", inp);
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}
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match matches.subcommand_name() {
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Some("test") => println!("The 'test' subcommand was used"),
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None => {}
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_ => unreachable!(),
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}
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}
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