Allow passing multiple arguments to mount multiple disks

README.md

@@ -20,7 +20,7 @@ After that, just run `cargo build --release`. The resulting binary will be saved
 
 **fox32** attempts to read its ROM from a file called `fox32.rom` in the current directory. If this file isn't found then it falls back to `../fox32rom/fox32.rom`, and if this file isn't found then it exits.
 
-Passing a file as an argument will mount that file as Disk 0.
+Passing files as arguments will mount those files as disks, in the order that the arguments were passed.
 
 See [encoding.md](encoding.md) for information about the instruction set.
 

src/main.rs

@@ -102,7 +102,11 @@ fn main() {
     };
 
     if args.len() > 1 {
-        bus.disk_controller.insert(File::open(&args[1]).expect("failed to load provided disk image"), 0);
+        let mut args_iter = args.iter();
+        args_iter.next();
+        for (i, arg) in args_iter.enumerate() {
+            bus.disk_controller.insert(File::open(&arg).expect("failed to load provided disk image"), i as u8);
+        }
     }
 
     let (mut runtime, memory): (Box<dyn Runtime>, MemoryWrapped) = {