Add Rust support

Signed-off-by: Dom Rodriguez <shymega@shymega.org.uk>

src/rust/CMakeLists.txt

@@ -0,0 +1,13 @@
+find_program(CXXBRIDGE cxxbridge PATHS "$ENV{HOME}/.cargo/bin/")
+if (CXXBRIDGE STREQUAL "CXXBRIDGE-NOTFOUND")
+    find_program(CARGO cargo PATHS "$ENV{HOME}/.cargo/bin/")
+    if (CARGO STREQUAL "CARGO-NOTFOUND")
+        message(FATAL_ERROR "Requires cargo available in path, install via rustup https://rustup.rs/")
+    endif()
+    message("Could not find cxxbridge, trying to install with `cargo install cxxbridge-cmd'")
+    execute_process(COMMAND ${CARGO} install cxxbridge-cmd)
+    find_program(CXXBRIDGE cxxbridge PATHS "$ENV{HOME}/.cargo/bin/")
+endif()
+
+corrosion_import_crate(MANIFEST_PATH Cargo.toml)
+corrosion_add_cxxbridge(rustlib CRATE openpinebuds_rs FILES lib.rs)

src/rust/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "openpinebuds-rs"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+name = "openpinebuds_rs"
+crate-type = ["staticlib"]
+
+[dependencies]
+cxx = "1.0"
+
+[build-dependencies]
+cxx-build = "1.0"

src/rust/src/lib.rs

@@ -0,0 +1,21 @@
+//! Rust library for OpenPineBuds
+#![deny(
+    warnings,
+    missing_copy_implementations,
+    missing_debug_implementations,
+    missing_docs,
+    clippy::all,
+    clippy::cargo,
+    trivial_casts,
+    trivial_numeric_casts,
+    unused_import_braces,
+    unused_qualifications,
+    unused_extern_crates,
+    variant_size_differences
+)]
+
+#[cxx::bridge]
+mod ffi {
+//! Rust FFI module for OpenPineBuds
+
+}