build.rs

//! The build.rs file is necessary to generate rules.zip.
//! rules.zip are needed so there is a way to get the rules dir into the build since you can't get from the crate.
//! The expectation is that most builds (with the exception of WASM builds) will need a build.rs file to extract the rules.
#![allow(clippy::needless_return)]
#![allow(dead_code)] // include! of rules_archive.rs pulls in the downloadable packager too

include!("src/rules_archive.rs");

fn main() {
    println!("cargo::rerun-if-changed=build.rs");
    println!("cargo::rerun-if-changed=src/rules_archive.rs");
    println!("cargo::rerun-if-changed=Rules");

    // This doesn't work because the build claims OUT_DIR is not defined(?)
    // let archive = PathBuf::from(concat!(env!("OUT_DIR"),"/rules.zip"));
    if std::env::var("CARGO_FEATURE_INCLUDE_ZIP").is_ok() {
        let out_dir = PathBuf::from(std::env::var_os("OUT_DIR").unwrap());
        let rules_dir = std::env::current_dir().unwrap().join("Rules");
        let staging = out_dir.join("rules_src");
        if staging.exists() {
            let _ = std::fs::remove_dir_all(&staging);
        }
        if let Err(e) = copy_rules_tree(&rules_dir, &staging, true) {
            panic!("build.rs failed to stage minimized Rules: {}", e);
        }
        let archive_path = out_dir.join("rules.zip");
        if let Err(e) = write_rules_archive(&staging, &archive_path, include_zip_compression()) {
            panic!("build.rs failed to write {}: {}", archive_path.display(), e);
        }
    }
}