surrealpatch/src/cli/version.rs

use anyhow::Error;
use clap;

const NAME: &'static str = env!("CARGO_PKG_NAME");
const VERSION: &'static str = env!("CARGO_PKG_VERSION");

macro_rules! get_cfg {
	($i:ident : $($s:expr),+) => (
		let $i = || { $( if cfg!($i=$s) { return $s; } );+ "unknown"};
	)
}

pub fn init(_: &clap::ArgMatches) -> Result<(), Error> {
	get_cfg!(target_os: "windows", "macos", "ios", "linux", "android", "freebsd", "openbsd", "netbsd");

	get_cfg!(target_arch: "x86", "x86_64", "mips", "powerpc", "powerpc64", "arm", "aarch64");

	println!("{} {} for {} on {}", NAME, VERSION, target_os(), target_arch());

	Ok(())
}