Derive: how to enable trailing_var_arg with derive

[fritzrehde]

I am creating a cli tool that works like this:

watchbind [OPTIONS] [CMD]

But CMD shouldn't have to be one argument like "ls -la", I want to be able to take everything after the options, i.e. ls -la without the quotes.
With the builder syntax I got it to work using

.trailing_var_arg(true)
		.arg(
			Arg::new("command")
				.help("Command to execute periodically")
				.multiple_values(true)
				.required(true)
				.value_parser(value_parser!(String)),
		)

But with derive I currently only have

	/// Command to execute periodically
	command: String,

TLDR: How do I allow an argument like ls -la instead of "ls -la" (without trailing_var_arg because that doesn't seem to exist for derive).

[epage]

trailing_var_arg exists in the derive. It might not show up by searching the derive reference but take a look at the documentation for raw Command attributes

You'll have to make the field's type be Vec<String>.

[epage]

See also #4090

[fritzrehde]

Works well with

	/// Command to execute periodically
	#[arg(trailing_var_arg(true))]
	command: Option<Vec<String>>,

[epage]

Yes, in clap v4 it was added as an arg attribute. I went with the more general solution in case you were on v3