Mirrors/clap
2
0
Fork 0
mirror of https://github.com/clap-rs/clap synced 2024-12-13 14:22:34 +00:00
Code Issues Projects Releases Packages Wiki Activity

docs(tutorial): Provide better default_value_t example

Browse source
This commit is contained in:
Ed Page 2022-09-16 16:14:01 -05:00
parent acb0fb7809
commit 3cadb8f255
4 changed files with 21 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
examples/tutorial_builder/03_05_default_values.md
View file

@ -2,19 +2,19 @@
$ 03_05_default_values --help $ 03_05_default_values --help
A simple to use, efficient, and full-featured Command Line Argument Parser A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: 03_05_default_values[EXE] [NAME] Usage: 03_05_default_values[EXE] [PORT]
Arguments: Arguments:
[NAME] [default: alice] [PORT] [default: 2020]
Options: Options:
-h, --help Print help information -h, --help Print help information
-V, --version Print version information -V, --version Print version information
$ 03_05_default_values $ 03_05_default_values
name: "alice" port: 2020
$ 03_05_default_values bob $ 03_05_default_values 22
name: "bob" port: 22
``` ```

12
examples/tutorial_builder/03_05_default_values.rs
View file

@ -1,14 +1,18 @@
use clap::{arg, command}; use clap::{arg, command, value_parser};
fn main() { fn main() {
let matches = command!() // requires `cargo` feature let matches = command!() // requires `cargo` feature
.arg(arg!([NAME]).default_value("alice")) .arg(
arg!([PORT])
.value_parser(value_parser!(u16))
.default_value("2020"),
)
.get_matches(); .get_matches();
println!( println!(
"name: {:?}", "port: {:?}",
matches matches
.get_one::<String>("NAME") .get_one::<u16>("PORT")
.expect("default ensures there is always a value") .expect("default ensures there is always a value")
); );
} }

10
examples/tutorial_derive/03_05_default_values.md
View file

@ -2,19 +2,19 @@
$ 03_05_default_values_derive --help $ 03_05_default_values_derive --help
A simple to use, efficient, and full-featured Command Line Argument Parser A simple to use, efficient, and full-featured Command Line Argument Parser
Usage: 03_05_default_values_derive[EXE] [NAME] Usage: 03_05_default_values_derive[EXE] [PORT]
Arguments: Arguments:
[NAME] [default: alice] [PORT] [default: 2020]
Options: Options:
-h, --help Print help information -h, --help Print help information
-V, --version Print version information -V, --version Print version information
$ 03_05_default_values_derive $ 03_05_default_values_derive
name: "alice" port: 2020
$ 03_05_default_values_derive bob $ 03_05_default_values_derive 22
name: "bob" port: 22
``` ```

6
examples/tutorial_derive/03_05_default_values.rs
View file

@ -3,12 +3,12 @@ use clap::Parser;
#[derive(Parser)] #[derive(Parser)]
#[command(author, version, about, long_about = None)] #[command(author, version, about, long_about = None)]
struct Cli { struct Cli {
#[arg(default_value_t = String::from("alice"))] #[arg(default_value_t = 2020)]
name: String, port: u16,
} }
fn main() { fn main() {
let cli = Cli::parse(); let cli = Cli::parse();
println!("name: {:?}", cli.name); println!("port: {:?}", cli.port);
} }