refactor: use created_new_file bool rather than keeping track of edits

todo.py

@@ -245,10 +245,10 @@ def remove_file(filename: Path) -> int:
     return 0
 
 
-def quit_program(todos: Todos, edits: int, prev_time: float) -> int:
+def quit_program(todos: Todos, created_new_file: bool, prev_time: float) -> int:
     """Exit the program, writing to disk first"""
     todos, _ = update_modified_time(prev_time, todos)
-    if edits < 1:
+    if created_new_file and len(todos) == 0:
         return remove_file(FILENAME)
     return update_file(FILENAME, todos)
 
@@ -490,8 +490,8 @@ def main(stdscr: curses.window) -> int:
     color and indentation level. Used for copy/paste
     operations.
 
-    edits:
-    int, used to indicate whether the file was newly
+    created_new_file:
+    bool, used to indicate whether the file was newly
     created and modified or not, determines whether
     to delete file in quit_program()
 
@@ -506,7 +506,7 @@ def main(stdscr: curses.window) -> int:
     history = UndoRedo()
     single_line_state = SingleLineModeImpl(SingleLineMode.ON)
     copied_todo = Todo()
-    edits = len(todos)
+    created_new_file = len(todos) == 0
     file_modified_time = get_file_modified_time(FILENAME)
     # if adding a new feature that updates `todos`,
     # make sure it also calls update_file()
@@ -581,7 +581,6 @@ def main(stdscr: curses.window) -> int:
     _print_history(history)
 
     while True:
-        edits += 1
         todos, file_modified_time = update_modified_time(file_modified_time, todos)
         set_header(stdscr, f"{HEADER}:")
         sublist_top = print_todos(stdscr, todos, selected, sublist_top)
@@ -618,14 +617,13 @@ def main(stdscr: curses.window) -> int:
             },
         )
         if isinstance(next_step, Todos):
-            return quit_program(next_step, edits, file_modified_time)
+            return quit_program(next_step, created_new_file, file_modified_time)
         if next_step not in (
             Key.ctrl_r,
             Key.u,
         ):  # redo/undo
             history.add(todos, selected)
         _print_history(history)
-        edits -= 1
 
 
 if __name__ == "__main__":