cool keys, bound check printing, add backspace

src/main.rs

@@ -73,8 +73,22 @@ impl Model {
 impl Perform for Model {
     // draw a character to the screen and update states
     fn print(&mut self, c: char) {
+        if self.cursor.col < self.buffer.width {
+        // scrolls
+        while self.cursor.row >= self.buffer.height {
+            for row in 0..(self.buffer.height - 1) {
+                for col in 0..self.buffer.width {
+                    self.buffer.set(col, row, self.buffer.get(col, row + 1));
+                };
+            };
+            for col in 0..self.buffer.width {
+                self.buffer.set(col, self.buffer.height - 1, None);
+            }
+            self.cursor.row -= 1;
+        };
         self.buffer.set(self.cursor.col, self.cursor.row, Some(c));
         self.cursor.col += 1;
+        }
         println!("[print] {:?}", c);
     }
 
@@ -83,6 +97,10 @@ impl Perform for Model {
         match byte {
             0x0D => self.cursor.col = 0,
             0x0A => self.cursor.row = self.cursor.row + 1,
+            0x08 => {
+                self.cursor.col = self.cursor.col - 1;
+                self.buffer.set(self.cursor.col, self.cursor.row, None);
+            },
             _ => (),
         }
         println!("[execute] {:02x}", byte);
@@ -241,10 +259,9 @@ fn main() {
             Err(_e) => (),
         };
 
-        let keys = window.get_keys_pressed(KeyRepeat::No);
+        let keys = window.get_keys_pressed(KeyRepeat::Yes);
-        if !keys.is_empty() { println!("{:?}", keys); }
+        let shift = window.is_key_down(Key::LeftShift) || window.is_key_down(Key::RightShift) || window.is_key_down(Key::CapsLock);
-        let shift = window.is_key_down(Key::LeftShift);
+        let ctrl = window.is_key_down(Key::LeftCtrl) || window.is_key_down(Key::RightCtrl);
-        let ctrl = window.is_key_down(Key::LeftCtrl);
         if !keys.is_empty() {
             let bytes: Vec<u8> = keys
                 .iter()