Choose save data location

src/config.rs

@@ -1,9 +1,10 @@
 use anyhow::Result;
+use bytemuck::NoUninit;
 use clap::{Parser, ValueEnum};
 use egui::{Color32, Pos2, Vec2};
 use serde::{Deserialize, Serialize};
 
-use crate::{emulator::SimId, persistence::Persistence, window::DisplayMode};
+use crate::{emulator::SimId, filesystem::Persistence, window::DisplayMode};
 use std::path::PathBuf;
 
 #[derive(Parser)]
@@ -53,6 +54,9 @@ pub struct CliArgs {
     /// Set a preference for whether to use a low-power or high-performance GPU adapter
     #[arg(long)]
     pub wgpu_power_preference: Option<PowerPreferenceWrapper>,
+    /// Choose whether save files are kept in the rom or the data directory
+    #[arg(long)]
+    pub save_data_location: Option<SaveDataLocation>,
 }
 
 #[derive(ValueEnum, Clone, Copy)]
@@ -90,12 +94,27 @@ const fn default_power_preference() -> wgpu::PowerPreference {
     wgpu::PowerPreference::LowPower
 }
 
+#[derive(Serialize, Deserialize, Clone, Copy, PartialEq, Eq, ValueEnum, Debug, NoUninit)]
+#[repr(usize)]
+pub enum SaveDataLocation {
+    /// The same directory as the ROM
+    RomDirectory,
+    /// This application's data directory
+    DataDirectory,
+}
+
+const fn default_save_data_location() -> SaveDataLocation {
+    SaveDataLocation::RomDirectory
+}
+
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq)]
 pub struct AppConfig {
     #[serde(default = "default_power_preference")]
     pub power_preference: wgpu::PowerPreference,
     #[serde(default)]
     pub force_fallback: bool,
+    #[serde(default = "default_save_data_location")]
+    pub save_data_location: SaveDataLocation,
 }
 
 impl AppConfig {
@@ -106,6 +125,7 @@ impl AppConfig {
         Self {
             power_preference: default_power_preference(),
             force_fallback: false,
+            save_data_location: default_save_data_location(),
         }
     }
 
@@ -123,6 +143,10 @@ impl AppConfig {
             self.force_fallback = force_fallback;
             updated = true;
         }
+        if let Some(save_data_location) = args.save_data_location {
+            self.save_data_location = save_data_location;
+            updated = true;
+        }
         updated
     }
 }