Can I make a subcommand that accept everything?

[JakkuSakura]

I have the following, but it gives me the error error: Found argument '-b' which wasn't expected, or isn't valid in this context. How can I make it working? AllowExternalSubcommand could work, but I'm not gonna have nice completion and help message.

pub fn copy_subcommand() -> App<'static> {
    // this is not meant to be used directly only for help message
    App::new("copy")
        .alias("--cp")
        .arg(Arg::new("from").multiple(true).required(true))
        .arg(Arg::new("to").multiple(true).last(true).required(true))
        .about("Copy mode accepts two parts of arguments <from> and <to>, the two parts are separated by [--]. <from> is the exact as Consumer mode, and <to> is the exact as Producer mode.")
}
pub fn get_arg_matcher() -> App<'static> {
    App::new("kafcat")
        .subcommands(vec![copy_subcommand()])
        .setting(AppSettings::SubcommandRequiredElseHelp)
        .arg(
            Arg::new("log")
                .long("log")
                .about("Configure the logging format: Off, Error, Warn, Info, Debug, Trace")
                .takes_value(true),
        )
}

vec!["kafcat", "copy", "-b", "localhost", "-t", "topic1", "-e", "--", "-b", "localhost", "-t", "topic2"]

[pksunkara]

You don't want copy subcommand to work at all but you made it as a subcommand? That's not possible at all. I am not even sure what you are trying to achieve.

[JakkuSakura]

I have a consumer and a producer subcommand. I will forward arguments to these two subcommands.
In this example, "-b", "localhost", "-t", "topic1", "-e" are for consumer, and "-b", "localhost", "-t", "topic2" are for producer.

vec!["kafcat", "copy", "-b", "localhost", "-t", "topic1", "-e", "--", "-b", "localhost", "-t", "topic2"]

[ldm0]

The user might want to get the raw arguments into two parts in the 'copy' subcommand, and forward them to another two Apps for processing?

[JakkuSakura]

Yes, it's just what I think

[ldm0]

Have you tried: ArgSettings::AllowHyphenValues?

[ldm0]

@qiujiangkun try this:

use clap::*;

    pub fn copy_subcommand() -> App<'static> {
        // this is not meant to be used directly only for help message
        App::new("copy")
            .setting(AppSettings::AllowLeadingHyphen)
            .alias("--cp")
            .arg(Arg::new("from").multiple(true).required(true))
            .arg(Arg::new("to").multiple(true).last(true).required(true))
            .about("Copy mode accepts two parts of arguments <from> and <to>, the two parts are separated by [--]. <from> is the exact as Consumer mode, and <to> is the exact as Producer mode.")
    }
    pub fn get_arg_matcher() -> App<'static> {
        App::new("kafcat")
            .subcommands(vec![copy_subcommand()])
            .setting(AppSettings::SubcommandRequiredElseHelp)
            .arg(
                Arg::new("log")
                    .long("log")
                    .about("Configure the logging format: Off, Error, Warn, Info, Debug, Trace")
                    .takes_value(true),
            )
    }
    
fn main() {
    let m = get_arg_matcher().get_matches_from(
        &vec!["kafcat", "copy", "-b", "localhost", "-t", "topic1", "-e", "--", "-b", "localhost", "-t", "topic2"]
    );
    dbg!(m);
}

[JakkuSakura]

Just tried. It's weird. I can see AllowHyphenValues on docs.rs, but not in my crate. I can only see a AllowLeadingHyphen. I tried the latter. It says error: Found argument 'localhost1' which wasn't expected, or isn't valid in this context

[ldm0]

Use the AppSettings rather than ArgSettings, and use clap's git master. I tried it and it works.

[JakkuSakura]

Thanks, I got it working