feat(userspace): programs in /bin w/o .elf; bin manifests (needs = display) so shell runs snake; Ctrl+C kills foreground via terminal interrupt notification; ctrl keys; sleep

crates/drivers/input/virtio/src/keymap.rs

@@ -4,6 +4,17 @@ use port_input_device::Key;
 
 pub const LEFT_SHIFT: u16 = 42;
 pub const RIGHT_SHIFT: u16 = 54;
+pub const LEFT_CTRL: u16 = 29;
+pub const RIGHT_CTRL: u16 = 97;
+
+/// A letter typed with Ctrl held is its control character, as on a
+/// terminal: Ctrl+C is 3. Anything else is itself.
+pub fn with_ctrl(key: Key) -> Key {
+    match key {
+        Key::Char(c) if c.is_ascii_alphabetic() => Key::Char(c.to_ascii_lowercase() & 0x1f),
+        k => k,
+    }
+}
 
 /// Rows of the main block: the first key's code, then each key unshifted
 /// and shifted.
@@ -41,6 +52,14 @@ pub fn key(code: u16, shift: bool) -> Option<Key> {
 mod tests {
     use super::*;
 
+    #[test]
+    fn ctrl_letters_are_control_characters() {
+        assert_eq!(with_ctrl(Key::Char(b'c')), Key::Char(3));
+        assert_eq!(with_ctrl(Key::Char(b'C')), Key::Char(3));
+        assert_eq!(with_ctrl(Key::Char(b'1')), Key::Char(b'1'));
+        assert_eq!(with_ctrl(Key::Enter), Key::Enter);
+    }
+
     #[test]
     fn letters_digits_and_shift() {
         assert_eq!(key(35, false), Some(Key::Char(b'h')));