Expand description
structopt-yaml is an default value loader from YAML for structopt.
§Examples
The following example show a quick example of structopt-yaml.
If derive(Deserialize), derive(StructOptYaml) and serde(default) are added to the struct
with derive(StructOpt), some functions like from_args_with_yaml can be used.
use serde_derive::Deserialize;
use structopt::StructOpt;
use structopt_yaml::StructOptYaml;
#[derive(Debug, Deserialize, StructOpt, StructOptYaml)]
#[serde(default)]
struct Opt {
#[structopt(default_value = "0", short = "a")] a: i32,
#[structopt(default_value = "0", short = "b")] b: i32,
}
fn main() {
let yaml_str = r#"
a: 10
"#;
let opt = Opt::from_args_with_yaml(yaml_str).expect("yaml parse failed");
println!("a:{}", opt.a);
println!("b:{}", opt.b);
}The execution result of the above example is below.
ⓘ
$ ./example
a:10 // value from YAML string
b:0 // value from default_value of structopt
$ ./example -a 20
a:20 // value from command line argument
b:0