Desktop: Unify save file handling and add file dialog for export (#3008)

* Prepare save file unification

* Desktop add save file dialog

desktop/src/app.rs

@@ -2,6 +2,7 @@ use crate::CustomEvent;
 use crate::WindowSize;
 use crate::consts::APP_NAME;
 use crate::dialogs::dialog_open_graphite_file;
+use crate::dialogs::dialog_save_file;
 use crate::dialogs::dialog_save_graphite_file;
 use crate::render::GraphicsState;
 use crate::render::WgpuContext;
@@ -83,17 +84,17 @@ impl WinitApp {
 		}
 
 		for message in responses.extract_if(.., |m| matches!(m, FrontendMessage::TriggerSaveDocument { .. })) {
-			let FrontendMessage::TriggerSaveDocument { document_id, name, path, document } = message else {
+			let FrontendMessage::TriggerSaveDocument { document_id, name, path, content } = message else {
 				unreachable!()
 			};
 			if let Some(path) = path {
-				let _ = std::fs::write(&path, document);
+				let _ = std::fs::write(&path, content);
 			} else {
 				let event_loop_proxy = self.event_loop_proxy.clone();
 				let _ = thread::spawn(move || {
 					let path = futures::executor::block_on(dialog_save_graphite_file(name));
 					if let Some(path) = path {
-						if let Err(e) = std::fs::write(&path, document) {
+						if let Err(e) = std::fs::write(&path, content) {
 							tracing::error!("Failed to save file: {}: {}", path.display(), e);
 						} else {
 							let message = Message::Portfolio(PortfolioMessage::DocumentPassMessage {
@@ -107,6 +108,18 @@ impl WinitApp {
 			}
 		}
 
+		for message in responses.extract_if(.., |m| matches!(m, FrontendMessage::TriggerSaveFile { .. })) {
+			let FrontendMessage::TriggerSaveFile { name, content } = message else { unreachable!() };
+			let _ = thread::spawn(move || {
+				let path = futures::executor::block_on(dialog_save_file(name));
+				if let Some(path) = path {
+					if let Err(e) = std::fs::write(&path, content) {
+						tracing::error!("Failed to save file: {}: {}", path.display(), e);
+					}
+				}
+			});
+		}
+
 		for message in responses.extract_if(.., |m| matches!(m, FrontendMessage::TriggerVisitLink { .. })) {
 			let _ = thread::spawn(move || {
 				let FrontendMessage::TriggerVisitLink { url } = message else { unreachable!() };

desktop/src/dialogs.rs

@@ -20,3 +20,7 @@ pub(crate) async fn dialog_save_graphite_file(name: String) -> Option<PathBuf> {
 		.await
 		.map(|f| f.path().to_path_buf())
 }
+
+pub(crate) async fn dialog_save_file(name: String) -> Option<PathBuf> {
+	AsyncFileDialog::new().set_title("Save File").set_file_name(name).save_file().await.map(|f| f.path().to_path_buf())
+}