Provide possibility to overwrite version

[nicolaiunrein]

Rust Version

rustc 1.46.0

Affected Version of clap

3.0.0-beta.1

Expected Behavior Summary

Provide possibility to overwrite how the --version argument is handled.

Actual Behavior Summary

Clap prints version prefixed with binary name even if I specify version as an argument and handle it myself.

Steps to Reproduce the issue

Run the example

Sample Code or Link to Sample Code

use clap::Clap;

#[derive(Clap)]
#[clap(author = "Author", name = "example")]
struct Opts {
    /// Print version and exit
    #[clap(short, long)]
    version: bool,
}

fn main() {
    let opts = Opts::parse();

    if opts.version {
        println!("TEST_VERSION");
    }
}

Running example -v prints example and not TEST_VERSION

[pksunkara]

https://docs.rs/clap/2.33.3/clap/enum.AppSettings.html#variant.DisableVersion

[pksunkara]

https://github.com/clap-rs/clap/tree/master/clap_derive/examples

[nicolaiunrein]

Could you provide a working example? I tried

use clap::Clap;

#[derive(Clap)]
#[clap(author = "Author", name = "example", version = AppSettings::NoAutoVersion )]
struct Opts {
    /// Print version and exit
    #[clap(short, long)]
    version: bool,
}

fn main() {
    let opts = Opts::parse();

    if opts.version {
        println!("TEST_VERSION");
    }
}

But now -v and --version just get ignored

[pksunkara]

use clap::{Clap, AppSettings};

#[derive(Clap)]
#[clap(author = "Author", name = "example", global_settings = &[NoAutoVersion])]
struct Opts {
    /// Print version and exit
    #[clap(short, long)]
    version: bool,
}

fn main() {
    let opts = Opts::parse();

    if opts.version {
        println!("TEST_VERSION");
    }
}

[nicolaiunrein]

Thanks for the example but it does not compile: no method named `global_settings` found for struct `clap::App<'_>` in the current scope and using global_setting = NoAutoVersion gives the same result as before.

[pksunkara]

As you can see from here, it is working. Not sure what the issue is in your case.

[thewh1teagle]

For anyone who look to override default version:

#[derive(Parser, Debug)]
#[command(author, version, about, long_about = None, disable_version_flag = true)]
struct Args {
  ...
}