structopt-toml 0.4.3

structopt-toml is an default value loader from TOML for structopt.

Examples

The following example show a quick example of structopt-toml.

If derive(Deserialize), derive(StructOptToml) and serde(default) are added to the struct with derive(StructOpt), some functions like from_args_with_toml can be used.

use serde_derive::Deserialize;
use structopt::StructOpt;
use structopt_toml::StructOptToml;

#[derive(Debug, Deserialize, StructOpt, StructOptToml)]
#[serde(default)]
struct Opt {
#[structopt(default_value = "0", short = "a")] a: i32,
#[structopt(default_value = "0", short = "b")] b: i32,
}

fn main() {
let toml_str = r#"
a = 10
"#;
let opt = Opt::from_args_with_toml(toml_str).expect("toml parse failed");
println!("a:{}", opt.a);
println!("b:{}", opt.b);
}

The execution result of the above example is below.

$ ./example
a:10        // value from TOML string
b:0         // value from default_value of structopt

$ ./example -a 20
a:20        // value from command line argument
b:0