Parse environment variables by defining a struct.
use envopt::EnvOpt;
#[derive(EnvOpt)]
pub enum EnvOpts {
#[envopt(name = "FOO")]
Foo,
#[envopt(name = "BAR", default = "default-bar")]
Bar,
}
pub fn main() {
EnvOpts::validate_or_exit();
println!("FOO: {}", EnvOpts::Foo.value_or_exit());
println!("BAR: {}", EnvOpts::Bar.value_or_exit());
}