use std::process::Command; fn main() {    let version = Command::new(if cfg!(windows) { "git.exe" } else { "git" })        .args(["describe", r"--match=v*\.*\.*"])        .output()        .ok()        .and_then(|out| {            if !out.status.success() {                return None;            }            try_parse_describe(&out.stdout)        })        .unwrap_or_else(|| env!("CARGO_PKG_VERSION").into());    println!("cargo:rustc-env=GIX_VERSION={version}");} fn try_parse_describe(input: &[u8]) -> Option<String> {    let input = std::str::from_utf8(input).ok()?;    let trimmed = input.trim();    (!trimmed.is_empty()).then(|| trimmed.to_owned())}