Include Git Commit Hash in Binary

[Thomas Frans]

Is your feature request related to a problem? Please describe.
I encountered a bug today that caused ncspot to freeze and ignore any signals (SIGTERM, 'q'...). I wanted to create a bug report for it but it's not reproducible and since I installed with cargo install --git https://github.com/hrkfdn/ncspot ncspot, I don't know the exact version I'm using.

Describe the solution you'd like
Since it makes sense for developers to dogfood the latest release, it would be handy to include the Git commit hash so the exact commit can be added to bug reports.

I looked online and found there are crates which let you do this. Even simpler would be to take the approach Alacritty takes. It gets the commit hash in the build.rs and makes it available to the actual build.

fn main() {
    let mut version = String::from(env!("CARGO_PKG_VERSION"));
    if let Some(commit_hash) = commit_hash() {
        version = format!("{version} ({commit_hash})");
    }
    println!("cargo:rustc-env=VERSION={version}");

    ...
}

fn commit_hash() -> Option<String> {
    Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .ok()
        .filter(|output| output.status.success())
        .and_then(|output| String::from_utf8(output.stdout).ok())
        .map(|hash| hash.trim().into())
}

[Henrik Friedrichsen]

The Alacritty approach looks good