sparse-ir-capi 0.8.0

C API for SparseIR Rust implementation
Documentation 
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use std::env;
use std::fs;
use std::path::PathBuf;
use std::process::Command;

fn main() {
    println!("cargo:rerun-if-changed=cbindgen.toml");
    println!("cargo:rerun-if-changed=src/lib.rs");

    // Track source files for rebuild detection
    let src_dir = PathBuf::from("src");
    for entry in fs::read_dir(&src_dir).unwrap() {
        let entry = entry.unwrap();
        let path = entry.path();
        if path.extension().and_then(|s| s.to_str()) == Some("rs") {
            println!("cargo:rerun-if-changed={}", path.display());
        }
    }

    // Check if cbindgen is available
    let cbindgen_output = Command::new("cbindgen").arg("--version").output();

    if cbindgen_output.is_err() {
        println!("cargo:warning=cbindgen not found. Install with: cargo install cbindgen");
        println!("cargo:warning=Header files will not be automatically generated.");
        return;
    }

    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
    let include_dir = PathBuf::from(&crate_dir).join("include");
    let sparseir_subdir = include_dir.join("sparseir");
    let sparseir_header = sparseir_subdir.join("sparseir.h");

    // Create sparseir subdirectory if it doesn't exist
    fs::create_dir_all(&sparseir_subdir).expect("Failed to create include/sparseir directory");

    // Generate sparseir.h directly with C++ compatibility (adds extern "C" blocks)
    let output = Command::new("cbindgen")
        .arg("--config")
        .arg("cbindgen.toml")
        .arg("--cpp-compat")
        .arg("--output")
        .arg(&sparseir_header)
        .current_dir(&crate_dir)
        .output()
        .expect("Failed to run cbindgen");

    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        panic!("cbindgen failed:\n{}", stderr);
    }
}