[Mac] Use Resources Dir

.github/app/Neothesia.app/Contents/Resources/settings.ron

@@ -0,0 +1,4 @@
+(
+    speed_multiplier: 1,
+    playback_offset: 0,
+)

.gitignore

@@ -1,3 +1,3 @@
 /target
 **/*.rs.bk
-settings.ron
+/settings.ron

Cargo.toml

@@ -47,5 +47,8 @@ serde = { version = "1.0.118", features = ["serde_derive"] }
 # console_error_panic_hook = "0.1.6"
 # console_log = "0.2.0"
 
+[target.'cfg(target_os = "macos")'.dependencies]
+objc = "0.2.7"
+
 [build-dependencies]
 glsl-to-spirv = "0.1.7"

src/config.rs

@@ -8,7 +8,8 @@ pub struct Config {
 
 impl Config {
     pub fn new() -> Self {
-        let config: Option<Config> = if let Ok(file) = std::fs::read_to_string("./settings.ron") {
+        let path = crate::resources::settings_ron();
+        let config: Option<Config> = if let Ok(file) = std::fs::read_to_string(path) {
             match ron::from_str(&file) {
                 Ok(config) => Some(config),
                 Err(err) => {
@@ -30,7 +31,8 @@ impl Config {
 impl Drop for Config {
     fn drop(&mut self) {
         if let Ok(s) = ron::ser::to_string_pretty(self, Default::default()) {
-            std::fs::write("./settings.ron", &s).ok();
+            let path = crate::resources::settings_ron();
+            std::fs::write(path, &s).ok();
         }
     }
 }

src/main.rs

@@ -28,6 +28,8 @@ use winit::{
 
 mod rectangle_pipeline;
 
+mod resources;
+
 pub struct MainState {
     pub midi_file: Option<lib_midi::Midi>,
     pub output_manager: OutputManager,

src/output_manager/mod.rs

@@ -107,7 +107,7 @@ impl OutputManager {
                                 (desc, Box::new(synth.new_output_connection(&font)));
                             self.selected_font_path = Some(font);
                         } else {
-                            let path = std::path::Path::new("./default.sf2");
+                            let path = crate::resources::default_sf2();
                             if path.exists() {
                                 let path = path.into();
                                 self.output_connection =

src/resources.rs

@@ -0,0 +1,50 @@
+pub fn default_sf2() -> PathBuff {
+    #[cfg(not(target_os = "macos"))]
+    return std::path::Path::new("./default.sf2");
+    #[cfg(target_os = "macos")]
+    return bundled_resource_path("default", "sf2")
+        .unwrap_or(std::path::Path::new("./default.sf2"));
+}
+
+pub fn settings_ron() -> PathBuff {
+    #[cfg(not(target_os = "macos"))]
+    return std::path::Path::new("./settings.ron");
+    #[cfg(target_os = "macos")]
+    return bundled_resource_path("settings", "ron")
+        .unwrap_or(std::path::Path::new("./settings.ron"));
+}
+
+#[cfg(target_os = "macos")]
+fn bundled_resource_path(name: &str, extension: &str) -> Option<String> {
+    use objc::runtime::{Class, Object};
+    use objc::{msg_send, sel, sel_impl};
+
+    unsafe {
+        let cls = Class::get("NSBundle").unwrap();
+        let bundle: *mut Object = msg_send![cls, mainBundle];
+        let cls = Class::get("NSString").unwrap();
+        let objc_str: *mut Object = msg_send![cls, alloc];
+        let objc_name: *mut Object = msg_send![objc_str,
+                                              initWithBytes:name.as_ptr()
+                                              length:name.len()
+                                              encoding: 4]; // UTF8_ENCODING
+        let objc_str: *mut Object = msg_send![cls, alloc];
+        let objc_ext: *mut Object = msg_send![objc_str,
+                                              initWithBytes:extension.as_ptr()
+                                              length:extension.len()
+                                              encoding: 4]; // UTF8_ENCODING
+        let ini: *mut Object = msg_send![bundle,
+                                         pathForResource:objc_name
+                                         ofType:objc_ext];
+        let _: () = msg_send![objc_name, release];
+        let _: () = msg_send![objc_ext, release];
+        let cstr: *const i8 = msg_send![ini, UTF8String];
+        if cstr != std::ptr::null() {
+            let rstr = std::ffi::CStr::from_ptr(cstr)
+                .to_string_lossy()
+                .into_owned();
+            return Some(rstr);
+        }
+        None
+    }
+}