Improve debugging

README.md

@@ -35,7 +35,7 @@ A virtual machine for controlling a wifi led strip.
 | jl (rgd, rgi, rgl)  | jumps to rgl if rgd < rgi                                                    | 0x21 |
 | je (rgd, rgi, rgl)  | jumps to rgl if rgd == rgi                                                   | 0x22 |
 | pause (rgd)         | pauses for rgd milliseconds                                                  | 0xF0 |
-| cmd (rgd)           | executes the command in rgd                                                  | 0xF1 |
+| cmd (rgd) (currently not supported)           | executes the command in rgd                                                  | 0xF1 |
 | send (rcr, rcg, rcb)| sends the values stored in the color registers to the strip                  | 0xF2 |
 
 ### Registers

src/runtime.rs

@@ -143,10 +143,10 @@ impl Runtime {
         let text = text_ref.borrow_mut();
         while self.current_index < text.len() {
             let token = text.get(self.current_index).unwrap();
-            token.invoke(self)?;
             if self.debug {
-                println!("{:?}", token);
+                println!("{:0>4}: {:?}", self.current_index, token);
             }
+            token.invoke(self)?;
 
             if let Some(code) = self.exit {
                 self.strip_controller

src/tokens.rs

@@ -629,8 +629,6 @@ impl Token for CmdToken {
 
     fn invoke(&self, _: &mut Runtime) -> io::Result<()> {
         unimplemented!();
-
-        Ok(())
     }
 }