Make delete key work

src/tui.rs

@@ -180,6 +180,17 @@ impl Editor {
         }
     }
 
+    fn delete(&mut self) {
+        let (r, col) = self.cursor;
+        let line_len = self.buffer[r].len();
+        if col < line_len {
+            self.buffer[r].remove(col);
+        } else if r + 1 < self.buffer.len() {
+            let next = self.buffer.remove(r + 1);
+            self.buffer[r].push_str(&next);
+        }
+    }
+
     fn newline(&mut self) {
         let (r, col) = self.cursor;
         let col = col.min(self.buffer[r].len());
@@ -479,6 +490,7 @@ fn step(
         match key.code {
             KeyCode::Char(c) if !ctrl => editor.insert_char(c),
             KeyCode::Backspace => editor.backspace(),
+            KeyCode::Delete => editor.delete(),
             KeyCode::Enter => editor.newline(),
             KeyCode::Left => editor.left(),
             KeyCode::Right => editor.right(),