Rust to Flutter Build Script

This script compiles a Rust library for both Android and iOS and copies the generated libraries to the appropriate Flutter project directories.

Features:

• Installs missing cross-compilation targets.
• Compiles Rust for Android.
• Conditionally compiles Rust for iOS if running on macOS.
• Optionally includes x86 and x86_64 Android targets using the -x flag.
• Automatically cleans the build directory before compiling.
• Copies .so (Android) and .dylib (iOS) files to the Flutter project.

Usage:

1. Ensure the following are installed:

   • cargo-ndk: Install via cargo install cargo-ndk.
   • Android NDK (set ANDROID_NDK_HOME or ANDROID_SDK_ROOT).
   • Rust toolchains for iOS targets if compiling on macOS.

2. Run the script:

   ./rust_to_flutter.sh [-x] <path_to_rust_project> <path_to_flutter_project>
   

   • The optional -x flag includes x86 and x86_64 targets for Android.

Examples:

• Standard build for Android and (on macOS) iOS:

  ./rust_to_flutter.sh ./rust_project ./flutter_project
  

• Include x86 and x86_64 targets for Android:

  ./rust_to_flutter.sh -x ./rust_project ./flutter_project
  

Notes:

• Android libraries are copied to android/app/src/main/jniLibs/<arch>.
• iOS libraries are copied to the ios directory.

Additional Information:

• iOS compilation is skipped automatically if the script is not running on macOS.
• The script checks for missing Rust cross-compilation targets and installs them as needed.