Use escape key to exit editing

The escape key can now be used to exit edit mode. In writing a todo,
this will also cancel the new todo.

Author: Piturnah

src/main.rs

@@ -410,8 +410,14 @@ fn main() {
                                 if editing {
                                     ui.edit_field(todo, &mut editing_cursor, x / 2);
 
-                                    if let Some('\n') = ui.key.take().map(|x| x as u8 as char) {
-                                        editing = false;
+                                    match ui.key.take().map(|x| x as u8 as char) {
+                                        Some('\n') => editing = false,
+                                        Some('\u{1b}') => {
+                                            editing = false;
+                                            list_delete(&mut todos, &mut todo_curr);
+                                            break;
+                                        }
+                                        _ => {}
                                     }
                                 } else {
                                     ui.label_fixed_width(
@@ -483,7 +489,9 @@ fn main() {
                                 if editing {
                                     ui.edit_field(done, &mut editing_cursor, x / 2);
 
-                                    if let Some('\n') = ui.key.take().map(|x| x as u8 as char) {
+                                    if let Some('\n') | Some('\u{1b}') =
+                                        ui.key.take().map(|x| x as u8 as char)
+                                    {
                                         editing = false;
                                     }
                                 } else {