Backtab support (#129)

crossterm_input/src/input/input.rs

@@ -225,6 +225,7 @@ where
         Some(b'B') => InputEvent::Keyboard(KeyEvent::Down),
         Some(b'H') => InputEvent::Keyboard(KeyEvent::Home),
         Some(b'F') => InputEvent::Keyboard(KeyEvent::End),
+        Some(b'Z') => InputEvent::Keyboard(KeyEvent::BackTab),
         Some(b'M') => {
             // X10 emulation mouse encoding: ESC [ CB Cx Cy (6 characters only).
             // NOTE (@imdaveho): cannot find documentation on this

crossterm_input/src/input/mod.rs

@@ -102,6 +102,7 @@ pub enum KeyEvent {
     End,
     PageUp,
     PageDown,
+    BackTab,
     Delete,
     Insert,
     F(u8),

crossterm_input/src/input/windows_input.rs

@@ -15,7 +15,7 @@ use winapi::um::{
     winuser::{
         VK_BACK, VK_CONTROL, VK_DELETE, VK_DOWN, VK_END, VK_ESCAPE, VK_F1, VK_F10, VK_F11, VK_F12,
         VK_F2, VK_F3, VK_F4, VK_F5, VK_F6, VK_F7, VK_F8, VK_F9, VK_HOME, VK_INSERT, VK_LEFT,
-        VK_MENU, VK_NEXT, VK_PRIOR, VK_RETURN, VK_RIGHT, VK_SHIFT, VK_UP,
+        VK_MENU, VK_NEXT, VK_PRIOR, VK_RETURN, VK_RIGHT, VK_SHIFT, VK_TAB, VK_UP,
     },
 };
 
@@ -249,6 +249,16 @@ fn handle_key_event(key_event: &KeyEventRecord, seq: &mut Vec<u8>) {
             seq.push(b'2');
             seq.push(b'~');
         }
+        VK_TAB => {
+            let key_state = &key_event.control_key_state;
+            if key_state.has_state(SHIFT_PRESSED) {
+                seq.push(b'\x1B');
+                seq.push(b'[');
+                seq.push(b'Z');
+            } else {
+                seq.push(b'\t');
+            }
+        }
         _ => {
             // Modifier Keys (Ctrl, Alt, Shift) Support
             // NOTE (@imdaveho): test to check if characters outside of