whycant 0.1.0

CLI tool to figure out why you can't do something.
Documentation 
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use std::process::Command;

fn main() {
    let hash = Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .ok()
        .filter(|o| o.status.success())
        .and_then(|o| String::from_utf8(o.stdout).ok())
        .map(|s| s.trim().to_owned())
        .filter(|s| !s.is_empty())
        .unwrap_or_else(|| "unknown".into());
    println!("cargo:rustc-env=WHYCANT_GIT_HASH={hash}");
    println!("cargo:rerun-if-changed=.git/HEAD");
    if let Ok(head) = std::fs::read_to_string(".git/HEAD") {
        if let Some(reference) = head.trim().strip_prefix("ref: ") {
            println!("cargo:rerun-if-changed=.git/{reference}");
            println!("cargo:rerun-if-changed=.git/packed-refs");
        }
    }
}