Excluding tool name from being parsed

[just-ero]

I want to use clap as a command parser (not a command line parser). The input are arbitrary strings where arguments are simply delimited by spaces.

This is what I tried:

#[derive(Debug, clap::Parser)]
#[command()]
struct SampleCmd {
    #[arg()]
    sample_arg: String,
}

fn main() -> anyhow::Result<()> {
    let mut rl = rustyline::DefaultEditor::new()?;

    let line = rl.readline("> ")?;
    println!("cmd input: {}", line);

    let cmd = SampleCmd::parse_from(line.split(' '));
    println!("{:?}", cmd);

    Ok(())
}

This is the output if I add any arbitrary first argument:

> PLACEHOLDER my-arg
cmd input: PLACEHOLDER my-arg
SampleCmd { sample_arg: "my-arg" }

This is the output if the first argument is omitted:

> my-arg
cmd input: my-arg
error: the following required arguments were not provided:
  <SAMPLE_ARG>

[epage]

You are likely looking for no_binary_name

You may also be interested in our repl example which instead uses multicall