pure-bindgen.rs

//! Regenerate the committed language bindings from the `pure-ffi` C ABI.
//!
//! ```sh
//! cargo run -p pure-ffi --features bindgen --bin pure-bindgen
//! ```
//!
//! Emits, relative to the crate root:
//!   * `include/pure_study.h`                 — C header (cbindgen), for
//!                                              C consumers and csbindgen/P-Invoke.
//!   * `bindings/csharp/PureStudyNative.g.cs` — C# P/Invoke shim (csbindgen).
//!
//! Kotlin/Android binds the same header via JNA (see `bindings/kotlin/`); its
//! wrapper is hand-written rather than generated, so it is not produced here.
//!
//! This is a developer tool, kept out of the cdylib so a plain build /
//! cross-compile never pulls host-only generators.

use std::path::Path;

fn main() {
    let crate_dir = env!("CARGO_MANIFEST_DIR");
    generate_c_header(crate_dir);
    generate_csharp(crate_dir);
    println!("bindings regenerated.");
}

fn generate_c_header(crate_dir: &str) {
    let out = Path::new(crate_dir).join("include/pure_study.h");
    std::fs::create_dir_all(out.parent().unwrap()).expect("create include/");

    let config = cbindgen::Config {
        language: cbindgen::Language::C,
        pragma_once: true,
        cpp_compat: true, // wrap in extern "C" when compiled as C++
        documentation: true,
        documentation_style: cbindgen::DocumentationStyle::C99,
        header: Some(
            "/* pure-study C ABI — GENERATED by `cargo run -p pure-ffi \
             --features bindgen`. Do not edit by hand. */"
                .to_string(),
        ),
        usize_is_size_t: true,
        ..Default::default()
    };

    cbindgen::Builder::new()
        .with_crate(crate_dir)
        .with_config(config)
        .generate()
        .expect("cbindgen: generate C header")
        .write_to_file(&out);
    println!("wrote {}", out.display());
}

fn generate_csharp(crate_dir: &str) {
    let out = Path::new(crate_dir).join("bindings/csharp/PureStudyNative.g.cs");
    std::fs::create_dir_all(out.parent().unwrap()).expect("create bindings/csharp/");

    csbindgen::Builder::default()
        .input_extern_file(Path::new(crate_dir).join("src/lib.rs"))
        .csharp_class_name("PureStudyNative")
        .csharp_dll_name("pure_ffi")
        .csharp_namespace("PureStudy.Native")
        .csharp_class_accessibility("public")
        .generate_csharp_file(&out)
        .expect("csbindgen: generate C# bindings");
    println!("wrote {}", out.display());
}