reg_constants/build.rs

use std::env;
use std::process::Command;

fn main() {
    let out_dir = env::var("OUT_DIR").unwrap();
    let python = env::var("PYTHON").unwrap_or("python3".to_string());

    let regtool =
        env::var("MATCHA_REGTOOL").expect("missing environment variable 'MATCHA_REGTOOL'");
    println!("cargo:rerun-if-env-changed=MATCHA_REGTOOL");
    println!("cargo:rerun-if-changed={}", regtool);

    let plic_hjson =
        env::var("MATCHA_PLIC_HJSON").expect("missing environment variable 'MATCHA_PLIC_HJSON'");
    println!("cargo:rerun-if-env-changed=MATCHA_PLIC_HJSON");
    println!("cargo:rerun-if-changed={}", plic_hjson);

    let mut cmd = Command::new("/usr/bin/env");
    cmd.arg(python)
        .arg(regtool)
        .arg("-R")
        .arg("-o")
        .arg(format!("{}/plic.rs", out_dir))
        .arg(plic_hjson);
    println!("Running: {:?}", cmd);
    assert!(cmd.status().unwrap().success());
}