save path as option

src/lib.rs

@@ -30,6 +30,7 @@ pub mod util;
 
 pub struct Options {
     pub rom_path: String,
+    pub save_path: Option<String>,
     pub bootrom_path: Option<String>,
     pub connect_serial: bool,
     pub verbose: bool,
@@ -53,9 +54,13 @@ pub fn init(
 ) {
     VERBOSE.set(options.verbose).unwrap();
 
-    let maybe_save = PathBuf::from_str(&options.rom_path)
+    let maybe_save = if let Some(path) = options.save_path {
-        .unwrap()
+        PathBuf::from_str(&path).unwrap()
-        .with_extension("sav");
+    } else {
+        PathBuf::from_str(&options.rom_path)
+            .unwrap()
+            .with_extension("sav")
+    };
 
     let rom: Rom = match fs::read(options.rom_path) {
         Ok(data) => Rom::load(data, maybe_save),

src/main.rs

@@ -22,6 +22,10 @@ struct Args {
     #[arg(short, long)]
     rom: String,
 
+    /// Save path
+    #[arg(long)]
+    save_path: Option<String>,
+
     /// BootROM path
     #[arg(short, long)]
     bootrom: Option<String>,
@@ -62,6 +66,7 @@ fn main() {
 
     let options = gb_emu::Options {
         rom_path: args.rom,
+        save_path: args.save_path,
         bootrom_path: args.bootrom,
         connect_serial: args.connect_serial,
         verbose: args.verbose,