Clap: Either do one or all steps

help
1

I have a case where I want the command to have multiple steps. I want that if the user specified a single step then do that step but if the user does not specify any then we do all steps.

step1
step2
step3

If I do just progname then we do all 3 steps. However if I do progname step2 then I do only step2.

Currently I have them as booleans. I check if all booleans are false then I set all to true. Wondering if there was something in Clap which can achieve this directly.

If I can do multiple steps as well then that works too. E.g: progname step2 step3, will do the 2 steps and skip step1 but this is nice to have.

2

Would a subcommand work? Clap doesn't support running multiple subcommands in a single invocation, but it does support optional subcommands:

use clap::Parser;

#[derive(Debug, Parser)]
struct Args {
    #[command(subcommand)]
    step: Option<Step>
}

#[derive(Debug, clap::Subcommand)]
enum Step {
    One,
    Two,
    Three
}

fn main() {
    let args = Args::parse();

    todo!()
}

If the associated program is run as example, then args.step is None and you can use things like unwrap_or to map that to a default behaviour, while if the program is run as example one then args.step is Some(Step::One), which can be used to select step-specific behaviours.