Parse groups of arguments into Vec of structs

[pronebird]

Hi,

I'd like to collect repeating named args into a struct. Consider the followng command:

cli --username <username> --password <password> \
    --query <query a> --db a \
    --query <query b> --db b \
    --query <query c>

Which I'd like to turn into something like this:

#[derive(Debug, Clone, Args, Default)]
struct ProgramArgs {
    #[arg(long, short)]
    username: String,

    #[arg(long, short)]
    password: String,

    #[arg(long, short, num_args(1..))]
    queries: Vec<Query>,
}

#[derive(Debug, Clone, Args, Default)]
struct Query {
  #[arg(long, short)]
  query: String,

  #[arg(long, short)]
  db: Option<String>,
}

Is it possible to achieve such behavior with clap?

[epage]

We are tracking this in #1704 with #2222 as a version of it that is the soonest that will happen. If someone doesn't get to it soon, I'll get to it when my focus is next on clap which will most likely be when i finish up some big cargo features I'm in the middle of.