rssn 0.2.12

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
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use std::env;

use vergen_gitcl::Build;
use vergen_gitcl::Cargo;
use vergen_gitcl::Emitter;
use vergen_gitcl::Gitcl;
use vergen_gitcl::Rustc;
use vergen_gitcl::Sysinfo;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    const ENV_VAR_NAME: &str = "DEV";

    println!("cargo:rustc-env=VERGEN_SYSINFO_KERNEL_VERSION=unknown");

    let mut emitter = Emitter::default();

    let build = Build::all_build();
    let gitcl = Gitcl::all_git();
    let si = Sysinfo::all_sysinfo();
    let rustc = Rustc::all_rustc();
    let cargo = Cargo::all_cargo();
    emitter
        .add_instructions(&gitcl)?
        .add_instructions(&build)?
        .add_instructions(&si)?
        .add_instructions(&rustc)?
        .add_instructions(&cargo)?
        .emit()?;

    // 1. Attempt to get the environment variable's value.
    match env::var(ENV_VAR_NAME) {
        // 2. If the variable is successfully retrieved (Ok(value)), check if the value is "1".
        | Ok(value) if value == "1" => {
            println!(
                "cargo:warning=Condition met: {} is set to '1'.",
                ENV_VAR_NAME
            );

            // 3. If the value is "1", call the function and use '?' to propagate errors.
            generate_headers()?;
        },
        // 4. If the variable is set to any other value, or not set (Err), skip.
        | _ => {
            println!(
                "cargo:warning=Skipping header generation. Set {}='1' to enable.",
                ENV_VAR_NAME
            );
        },
    }

    Ok(())
}

fn generate_headers() -> Result<(), Box<dyn std::error::Error>> {
    let crate_dir = std::env::var("CARGO_MANIFEST_DIR")?;

    // Generate C header using cbindgen.toml
    match cbindgen::generate(&crate_dir) {
        | Ok(bindings) => {
            bindings.write_to_file("rssn.h");

            println!("cargo:warning=Generated rssn.h");
        },
        | Err(e) => {
            println!(
                "cargo:warning=Failed \
                 to generate C \
                 bindings: {:?}",
                e
            );

            println!("cargo:warning=Continuing build without C header generation");
        },
    }

    // Generate C++ header with custom config
    let cpp_config = cbindgen::Config {
        language: cbindgen::Language::Cxx,
        namespace: Some("rssn".to_string()),
        ..cbindgen::Config::from_file("cbindgen.toml").unwrap_or_default()
    };

    match cbindgen::Builder::new()
        .with_crate(&crate_dir)
        .with_config(cpp_config)
        .generate()
    {
        | Ok(bindings) => {
            bindings.write_to_file("rssn.hpp");

            println!("cargo:warning=Generated rssn.hpp");
        },
        | Err(e) => {
            println!(
                "cargo:warning=Failed \
                 to generate C++ \
                 bindings: {:?}",
                e
            );

            println!("cargo:warning=Continuing build without C++ header generation");
        },
    }

    println!("cargo:rerun-if-changed=src/");

    println!("cargo:rerun-if-changed=cbindgen.toml");

    println!("cargo:rerun-if-changed=Cargo.toml");

    Ok(())
}