How to generate a string of a CLI invocation from a derive struct

[jmrgibson]

I have a job scheduling application where jobs (which are CLI args + an environment) are submitted to a scheduler to be executed on remote compute. Most of the apps we run are rust binaries, and so I would like to generate a CLI invocation from a derive struct (i.e., the reverse of what Clap usually does)

For example, if I have

#[clap(Derive)]
struct Foo {
   #[clap(long)]
   bar: String
   #[clap(long)]
   baz: String
}

let x = Foo{
   bar: "1".to_string(),
   baz: "2".to_string(),
}

I would like to have a function (lets call it as_invocation) that renders the args and their values to a string as they would appear on the CLI, like below

assert_eq!(x.as_invocation(), "--bar=1, --baz=2".to_string())

Is something like this possible?

[epage]

We don't support this. The issue for this is #3131