enzyme 0.3.0

A helper crate to simplify experimenting with Enzyme.
Documentation 
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use dirs;
use std::path::PathBuf;

use super::version_manager::{RUSTC_VER, ENZYME_VER};

/// We offer support for downloading and compiling these two repositories.
pub enum Repo {
    /// For handling the Enzyme repository.
    Enzyme,
    /// For handling the Rust repository.
    Rust,
}

fn assert_existence(path: PathBuf) {
    if !path.is_dir() {
        std::fs::create_dir_all(path.clone())
            .unwrap_or_else(|_| panic!("Couldn't create: {}", path.display()));
    }
}
pub fn get_enzyme_base_path() -> PathBuf {
    let cache_dir = dirs::cache_dir().expect("Enzyme needs access to your cache dir.");
    dbg!(&cache_dir);
    let enzyme_base_path = cache_dir.join("enzyme");
    assert_existence(enzyme_base_path.clone());
    dbg!(&enzyme_base_path);
    enzyme_base_path
}
pub fn get_enzyme_repo_path() -> PathBuf {
    let path = get_enzyme_base_path()
        .join("Enzyme-".to_owned() + ENZYME_VER);
    assert_existence(path.clone());
    path
}
fn get_enzyme_subdir_path() -> PathBuf {
    let path = get_enzyme_repo_path()
        .join("enzyme");
    assert_existence(path.clone());
    path
}
pub fn get_capi_path() -> PathBuf {
    get_enzyme_subdir_path().join("Enzyme").join("CApi.h")
}
pub fn get_bindings_string() -> PathBuf {
    get_enzyme_base_path().join("enzyme.rs")
}
pub fn get_enzyme_build_path() -> PathBuf {
    let enzyme_path = get_enzyme_subdir_path().join("build");
    assert_existence(enzyme_path.clone());
    enzyme_path
}
pub fn get_download_dir() -> PathBuf {
    let enzyme_download_path = get_enzyme_base_path().join("downloads");
    assert_existence(enzyme_download_path.clone());
    enzyme_download_path
}
pub fn get_rustc_repo_path() -> PathBuf {
    let rustc_path = get_enzyme_base_path().join("rustc-".to_owned() + RUSTC_VER + "-src");
    assert_existence(rustc_path.clone());
    rustc_path
}
pub fn get_rustc_build_path() -> PathBuf {
    let rustc_path = get_rustc_repo_path().join("build");
    assert_existence(rustc_path.clone());
    rustc_path
}
fn get_rustc_platform_path() -> PathBuf {
    let platform = env!("TARGET");
    get_rustc_build_path().join(&platform)
}
pub fn get_rustc_stage2_path() -> PathBuf {
    get_rustc_platform_path().join("stage2")
}
pub fn get_llvm_build_path() -> PathBuf {
    get_rustc_platform_path().join("llvm").join("build")
}
pub fn get_llvm_header_path() -> PathBuf {
    get_rustc_platform_path().join("llvm").join("include")
}
pub fn get_remote_enzyme_tarball_path() -> String {
    format!(
        "https://github.com/wsmoses/Enzyme/archive/refs/tags/v{}.tar.gz",
        ENZYME_VER
    )
}
pub fn get_remote_rustc_tarball_path() -> String {
    format!(
        "https://static.rust-lang.org/dist/rustc-{}-src.tar.gz",
        RUSTC_VER
    )
}