Use Application Support directory on macOS. (#553)

src/game/config.cpp

@@ -162,6 +162,13 @@ std::filesystem::path zelda64::get_app_folder_path() {
        return std::filesystem::path{getenv("APP_FOLDER_PATH")};
    }
 
+#if defined(__APPLE__)
+   const auto supportdir = zelda64::get_application_support_directory();
+   if (supportdir) {
+       return *supportdir / zelda64::program_id;
+   }
+#endif
+
    const char *homedir;
 
    if ((homedir = getenv("HOME")) == nullptr) {

src/main/support_apple.mm

@@ -12,6 +12,15 @@ namespace zelda64 {
         });
     }
 
+    std::optional<std::filesystem::path> get_application_support_directory() {
+        NSArray *dirs = NSSearchPathForDirectoriesInDomains(NSApplicationSupportDirectory, NSUserDomainMask, YES);
+        if ([dirs count] > 0) {
+            NSString *dir = [dirs firstObject];
+            return std::filesystem::path([dir UTF8String]);
+        }
+        return std::nullopt;
+    }
+
     std::filesystem::path get_bundle_resource_directory() {
         NSString *bundlePath = [[NSBundle mainBundle] resourcePath];
         return std::filesystem::path([bundlePath UTF8String]);