graphwalker-studio 1.0.2

use std::process::Command;

fn git_output(args: &[&str]) -> Option<String> {
    let output = Command::new("git").args(args).output().ok()?;
    if !output.status.success() {
        return None;
    }
    String::from_utf8(output.stdout)
        .ok()
        .map(|value| value.trim().to_string())
        .filter(|value| !value.is_empty())
}

fn main() {
    for path in ["HEAD", "packed-refs"] {
        if let Some(path) = git_output(&["rev-parse", "--git-path", path]) {
            println!("cargo:rerun-if-changed={path}");
        }
    }
    if let Some(reference) = git_output(&["symbolic-ref", "-q", "HEAD"]) {
        if let Some(path) = git_output(&["rev-parse", "--git-path", &reference]) {
            println!("cargo:rerun-if-changed={path}");
        }
    }

    let git_id =
        git_output(&["rev-parse", "--short=7", "HEAD"]).unwrap_or_else(|| "unknown".to_string());
    println!("cargo:rustc-env=GRAPHWALKER_GIT_ID={git_id}");
}