clap/clap_mangen

clap_mangen

Manpage generation for clap

Dual-licensed under Apache 2.0 or MIT.

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About

Generate ROFF from a clap::App.

Example

We're going to assume you want to generate your man page as part of your development rather than your shipped program having a flag to generate it.

In your Cargo.toml:

[build-dependencies]
clap_mangen = "0.1"

In your build.rs:

fn main() -> std::io::Result<()> {
    let out_dir = std::path::PathBuf::from(std::env::var_os("OUT_DIR").ok_or_else(|| std::io::ErrorKind::NotFound)?);

    let app = clap::App::new("mybin")
        .arg(clap::arg!(-n --name <NAME>))
        .arg(clap::arg!(-c --count <NUM>));

    let man = clap_mangen::Man::new(app);
    let mut buffer: Vec<u8> = Default::default();
    man.render(&mut buffer)?;

    std::fs::write(out_dir.join("mybin.1"), buffer)?;

    Ok(())
}

Tip: Consider a cargo xtask instead of a build.rs to reduce build costs.