feat: add cbindgen support

wfassoc-cdylib/build.rs

@@ -0,0 +1,23 @@
+extern crate cbindgen;
+
+use std::{env, path::Path};
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let crate_dir_path = Path::new(&crate_dir);
+    let cbindgen_toml_path = crate_dir_path.join("cbindgen.toml");
+    let cbindgen_config = cbindgen::Config::from_file(cbindgen_toml_path)
+        .expect("Unable to load cbindgen configuration file.");
+
+    let out_dir = env::var("OUT_DIR").unwrap();
+    let out_dir_path = Path::new(&out_dir);
+    let wfassoc_h_path = out_dir_path.join("wfassoc.h");
+
+    cbindgen::Builder::new()
+        .with_crate(crate_dir)
+        .with_config(cbindgen_config)
+        .generate()
+        .expect("Unable to generate bindings")
+        .write_to_file(wfassoc_h_path);
+}