Add Default impls

src/cpu.rs

@@ -37,6 +37,12 @@ pub struct CPU {
     pub memory: Memory,
 }
 
+impl Default for CPU {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl CPU {
     pub fn new() -> CPU {
         CPU {
@@ -554,7 +560,14 @@ impl CPU {
 
         let mask = Status::PS_CARRY | Status::PS_OVERFLOW;
 
-		self.registers.status.set_with_mask( mask, Status::new(StatusArgs { carry: did_carry, overflow: did_overflow, ..StatusArgs::none() }),);
+        self.registers.status.set_with_mask(
+            mask,
+            Status::new(StatusArgs {
+                carry: did_carry,
+                overflow: did_overflow,
+                ..StatusArgs::none()
+            }),
+        );
 
         self.load_accumulator(result);
 
@@ -618,10 +631,13 @@ impl CPU {
 
         self.registers.status.set_with_mask(
             mask,
-				Status::new(StatusArgs { carry: did_carry, overflow: did_overflow, ..StatusArgs::none() }),
+            Status::new(StatusArgs {
+                carry: did_carry,
+                overflow: did_overflow,
+                ..StatusArgs::none()
+            }),
         );
 
-
         self.load_accumulator(result);
     }
 
@@ -809,7 +825,9 @@ mod tests {
     #[test]
     fn decimal_subtract_test() {
         let mut cpu = CPU::new();
-		cpu.registers.status.or(Status::PS_DECIMAL_MODE | Status::PS_CARRY);
+        cpu.registers
+            .status
+            .or(Status::PS_DECIMAL_MODE | Status::PS_CARRY);
         cpu.registers.accumulator = 0;
 
         cpu.subtract_with_carry(0x48);

src/memory.rs

@@ -54,9 +54,17 @@ pub struct Memory {
     bytes: [u8; MEMORY_SIZE],
 }
 
+impl Default for Memory {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Memory {
     pub fn new() -> Memory {
-        Memory { bytes: [0; MEMORY_SIZE] }
+        Memory {
+            bytes: [0; MEMORY_SIZE],
+        }
     }
 
     pub fn get_byte(&self, address: Address) -> u8 {
@@ -101,7 +109,10 @@ mod tests {
     fn test_memory_set_bytes() {
         let mut memory = Memory::new();
         memory.set_bytes(Address(0x0100), &[1, 2, 3, 4, 5]);
-        assert_eq!(memory.get_slice(Address(0x00FF), AddressDiff(7)), &[0, 1, 2, 3, 4, 5, 0]);
+        assert_eq!(
+            memory.get_slice(Address(0x00FF), AddressDiff(7)),
+            &[0, 1, 2, 3, 4, 5, 0]
+        );
     }
 
     #[test]

src/registers.rs

@@ -26,7 +26,7 @@
 // POSSIBILITY OF SUCH DAMAGE.
 
 use address::{Address, AddressDiff};
-use memory::{STACK_ADDRESS_LO, STACK_ADDRESS_HI};
+use memory::{STACK_ADDRESS_HI, STACK_ADDRESS_LO};
 
 // Useful for constructing Status instances
 #[derive(Copy, Clone)]
@@ -88,15 +88,18 @@ impl Status {
         })
     }
 
-    pub fn new(StatusArgs { negative,
+    pub fn new(
+        StatusArgs {
+            negative,
             overflow,
             unused,
             brk,
             decimal_mode,
             disable_interrupts,
             zero,
-                            carry }: StatusArgs) -> Status
+            carry,
-    {
+        }: StatusArgs,
+    ) -> Status {
         let mut out = Status::empty();
 
         if negative {
@@ -169,6 +172,12 @@ pub struct Registers {
     pub status: Status,
 }
 
+impl Default for Registers {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Registers {
     pub fn new() -> Registers {
         // TODO akeeton: Revisit these defaults.