Implement backspace

src/interrupts.rs

@@ -59,9 +59,14 @@ extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: InterruptStac
     if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
         if let Some(key) = keyboard.process_keyevent(key_event) {
             match key {
-                DecodedKey::Unicode(character) => print!("{}", character),
-                DecodedKey::RawKey(key) => print!("{:?}", key),
-            }
+                DecodedKey::Unicode(character) => {
+                    if character == '\u{8}' {
+                        crate::vga_buffer::backspace();
+                    } else {
+                        print!("{}", character)
+                    }
+                },
+                DecodedKey::RawKey(key) => print!("{:#?}", key), }
         }
     }
 

src/vga_buffer.rs

@@ -150,4 +150,14 @@ pub fn _print(args: fmt::Arguments) {
 }   
 
 
-
+pub fn backspace() {
+    let mut writer = WRITER.lock();
+    let row = BUFFER_HEIGHT - 1;
+    let col = writer.column_position;
+    let color_code = writer.color_code;
+    writer.buffer.chars[row][col - 1].write(ScreenChar {
+        ascii_character: b' ',
+        color_code
+    });
+    writer.column_position -= 1;
+}