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extern crate bindgen;
use std::env;
use std::path::PathBuf;
// Clang extra args env variable name
const MOSQUITTO_PLUGIN_CLANG_EXTRA_ARGS: &str = "MOSQUITTO_PLUGIN_CLANG_EXTRA_ARGS";
fn main() {
// Tell cargo to invalidate the built crate whenever the wrapper changes
println!("cargo:rerun-if-changed=wrapper.h");
// Tell cargo to invalidate the built crate whenever the extra args variable changes
println!(
"cargo:rerun-if-env-changed={}",
MOSQUITTO_PLUGIN_CLANG_EXTRA_ARGS
);
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let builder = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("wrapper.h")
// Filter functions with mosquitto_.*
.allowlist_function("mosquitto_.*")
// Filter types with mosquitto_.*
.allowlist_type("mosquitto_.*")
// Filter variables with MOSQ_.*
.allowlist_var("MOSQ_.*")
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks));
// If the clang extra arguments variable is set, add the arguments
let builder = if let Ok(args) = env::var(MOSQUITTO_PLUGIN_CLANG_EXTRA_ARGS) {
builder.clang_args(args.split_whitespace())
} else {
builder
};
let bindings = builder
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}