kaish-kernel 0.3.0

Core kernel for kaish: lexer, parser, interpreter, and runtime
Documentation 
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//! Build script for kaish-kernel.
//!
//! Captures git hash and build date for `uname -v` output.

use std::process::Command;

fn main() {
    // Rerun when git HEAD changes (covers commits, checkouts, rebases)
    println!("cargo::rerun-if-changed=../../.git/HEAD");
    println!("cargo::rerun-if-changed=../../.git/refs/heads/");

    let git_hash = Command::new("git")
        .args(["rev-parse", "--short", "HEAD"])
        .output()
        .ok()
        .filter(|o| o.status.success())
        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_string())
        .unwrap_or_else(|| "unknown".to_string());

    let build_date = chrono::Utc::now().format("%Y-%m-%d").to_string();

    println!("cargo:rustc-env=KAISH_GIT_HASH={git_hash}");
    println!("cargo:rustc-env=KAISH_BUILD_DATE={build_date}");
}