Make sure keyboard interrupted renders don't overwrite pre-existing video files

manimlib/scene/scene.py

@@ -124,6 +124,7 @@ class Scene(object):
         except KeyboardInterrupt:
             # Get rid keyboard interupt symbols
             print("", end="\r")
+            self.file_writer.ended_with_interrupt = True
         self.tear_down()
 
     def setup(self) -> None:
@@ -190,7 +191,6 @@ class Scene(object):
         # As long as the copied selection starts with a comment,
         # this will revert to the state of the scene at the first
         # point of running.
-        def checkpoint_paste(skip=False, show_progress=False):
         def checkpoint_paste(skip=False, show_progress=True):
             pasted = pyperclip.paste()
             line0 = pasted.lstrip().split("\n")[0]

manimlib/scene/scene_file_writer.py

@@ -54,6 +54,7 @@ class SceneFileWriter(object):
         self.scene: Scene = scene
         self.writing_process: sp.Popen | None = None
         self.has_progress_display: bool = False
+        self.ended_with_interrupt: bool = False
         self.init_output_directories()
         self.init_audio()
 
@@ -297,7 +298,11 @@ class SceneFileWriter(object):
         self.writing_process.terminate()
         if self.has_progress_display:
             self.progress_display.close()
+
+        if not self.ended_with_interrupt:
             shutil.move(self.temp_file_path, self.final_file_path)
+        else:
+            self.movie_file_path = self.temp_file_path
 
     def combine_movie_files(self) -> None:
         kwargs = {