I have a clap struct as follows:
#[derive(Clap)]
#[clap(
version = "0.1.0",
author = "..."
)]
pub struct Cli {
#[clap(long)]
arg_a: Option<String>,
#[clap(long)]
arg_b: Option<String>,
#[clap(long)]
arg_c: Option<String>,
#[clap(long)]
other_arguments: Option<usize>,
}
How do I specify that at least one of {arg_a, arg_b, arg_c} must be present, but also more can be present?
You can read about argument relations at https://github.com/clap-rs/clap/blob/v3.1.14/examples/tutorial_derive/README.md#argument-relations
Add for example:
#[clap(group(
ArgGroup::new("my-group")
.required(true)
.args(&["arg-a", "arg-b", "arg-c"]),
))]
https://docs.rs/clap/latest/clap/struct.ArgGroup.html#method.required "Require an argument from the group to be present when parsing."