feat(vga): add vga change color interface

Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>

src/lib.rs

@@ -1,20 +1,22 @@
 #![no_std]
 #![no_main]
 
+mod vga;
 use core::panic::PanicInfo;
+use vga::Color;
 
 #[panic_handler]
 fn panic_handler(info: &PanicInfo) -> ! {
+    vga::change_color(Color::LightRed, Color::Black);
     println!("{}", info);
     loop {}
 }
 
-mod vga;
 
 #[no_mangle]
 pub extern "C" fn julios_main() -> ! {
     println!("Hello World!");
     println!("{}", "***JuliOS***");
-    panic!("Test panick");
+    panic!("Test panic");
     loop {}
 }

src/vga.rs

@@ -9,7 +9,7 @@ const BUFFER_WIDTH: usize = 80;
 lazy_static! {
     pub static ref WRITER: Mutex<Writer> = Mutex::new(Writer {
         column: 0,
-        color_code: ColorCode::new(Color::Green, Color::Black),
+        color_code: ColorCode::new(Color::LightBlue, Color::Black),
         buffer: unsafe { &mut *(0xb8000 as *mut VgaBuffer) }
     });
 }
@@ -30,6 +30,9 @@ pub fn _print(args: fmt::Arguments) {
     use core::fmt::Write;
     WRITER.lock().write_fmt(args).unwrap();
 }
+pub fn change_color(fg: Color, bg: Color) {
+    WRITER.lock().change_color(ColorCode::new(fg, bg))
+}
 
 
 #[allow(dead_code)]
@@ -133,6 +136,10 @@ impl Writer {
             self.buffer.chars[row][col].write(blank);
         }
     }
+
+    fn change_color(&mut self, color: ColorCode) {
+        self.color_code = color;
+    }
 }
 
 impl fmt::Write for Writer {