feat: Add CPM and Rust support

CPM.cmake

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: MIT
+#
+# SPDX-FileCopyrightText: Copyright (c) 2019-2023 Lars Melchior and contributors
+
+set(CPM_DOWNLOAD_VERSION 0.38.7)
+set(CPM_HASH_SUM "83e5eb71b2bbb8b1f2ad38f1950287a057624e385c238f6087f94cdfc44af9c5")
+
+if(CPM_SOURCE_CACHE)
+  set(CPM_DOWNLOAD_LOCATION "${CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+elseif(DEFINED ENV{CPM_SOURCE_CACHE})
+  set(CPM_DOWNLOAD_LOCATION "$ENV{CPM_SOURCE_CACHE}/cpm/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+else()
+  set(CPM_DOWNLOAD_LOCATION "${CMAKE_BINARY_DIR}/cmake/CPM_${CPM_DOWNLOAD_VERSION}.cmake")
+endif()
+
+# Expand relative path. This is important if the provided path contains a tilde (~)
+get_filename_component(CPM_DOWNLOAD_LOCATION ${CPM_DOWNLOAD_LOCATION} ABSOLUTE)
+
+file(DOWNLOAD
+     https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_DOWNLOAD_VERSION}/CPM.cmake
+     ${CPM_DOWNLOAD_LOCATION} EXPECTED_HASH SHA256=${CPM_HASH_SUM}
+)
+
+include(${CPM_DOWNLOAD_LOCATION})

Rust.cmake

@@ -0,0 +1,39 @@
+# Dependencies that are downloaded using the CPM package manager
+include("${CMAKE_CURRENT_LIST_DIR}/CPM.cmake")
+
+option(USE_RUST "Use Rust" ON)
+if(USE_RUST)
+
+  # Define USING_RUST to be used in C++ code
+  add_definitions(-DUSING_RUST)
+
+  # Install corrosion – a Rust to C++ bridge
+  cpmaddpackage(NAME Corrosion GITHUB_REPOSITORY corrosion-rs/corrosion GIT_TAG
+                v0.4.7)
+
+  # Rust directory: rust in root dir
+  set(RUST_DIR "${CMAKE_CURRENT_SOURCE_DIR}/rust")
+
+  # Add a rust library After this, all you need to do is link to the rust
+  # library in your C++ like this: target_link_libraries(SharedCode INTERFACE
+  # myrustlib)
+  corrosion_import_crate(MANIFEST_PATH "${RUST_DIR}/{{ cookiecutter.__rust_lib_name }}/Cargo.toml")
+
+  corrosion_add_cxxbridge(
+    {{ cookiecutter.__rust_lib_name }}
+    CRATE
+    {{ cookiecutter.__rust_crate_name }}
+    MANIFEST_PATH
+    "${RUST_DIR}/{{ cookiecutter.__rust_lib_name }}"
+    # NOTE: These file paths are relative to the root of the rust crate's src
+    # dir eg rust/{{ cookiecutter.__rust_lib_name }}/src.
+    FILES
+    "lib.rs")
+
+  if(MSVC)
+    # Note: This is required because we use `cxx` which uses `cc` to compile and
+    # link C++ code.
+    corrosion_set_env_vars({{ cookiecutter.__rust_crate_name }} "CFLAGS=-MDd" "CXXFLAGS=-MDd")
+  endif()
+
+endif()