Don't allow previous recording's size to show when starting new recording

[srec] / srec.py

diff --git a/srec.py b/srec.py
index 8207c91352fa434fdc32c6ebf971bec236d4cafe..0828310be4dfc96b2b21cc912462ed5937b31331 100644 (file)
--- a/srec.py
+++ b/srec.py
@@ -4,6 +4,8 @@
 # under the terms of the GNU General Public License as published by the
 # Free Software Foundation, version 3.
 
+from __future__ import annotations
+
 from dataclasses import dataclass
 from datetime import datetime
 import os
@@ -23,6 +25,11 @@ from gi.repository import GLib  # nopep8 pylint: disable=wrong-import-position
 class Stream:
     process: subprocess.Popen[bytes]
 
+    @staticmethod
+    def start(command: list[str]) -> Stream:
+        # pylint: disable=consider-using-with
+        return Stream(process=subprocess.Popen(command, stdin=subprocess.PIPE))
+
     def stop(self) -> None:
         stdin = self.process.stdin
         assert stdin is not None
@@ -67,27 +74,31 @@ def summarize_size(n: int) -> str:
     return str(n)
 
 
+def begin_monitoring_file_size(size_display: Gtk.Label, filename: str) -> None:
+    def update_size_display() -> Any:
+        done = recording is None
+        if done:
+            size_display.set_label('')
+        else:
+            try:
+                size = summarize_size(os.stat(filename).st_size)
+            except FileNotFoundError:
+                size = '--'
+            size_display.set_label(f'<big>{size}</big>')
+        return GLib.SOURCE_REMOVE if done else GLib.SOURCE_CONTINUE
+    GLib.timeout_add_seconds(1, update_size_display)
+
+
 def on_start_recording(_: Gtk.Button, stack: Gtk.Stack) -> None:
     global recording  # pylint: disable=global-statement
     assert recording is None
 
     filename = make_filename()
-    size_display = find_size_display(stack)
-
-    def update_size_display() -> Any:
-        try:
-            size = summarize_size(os.stat(filename).st_size)
-        except FileNotFoundError:
-            size = '--'
-        size_display.set_label(f'<big>{size}</big>')
-        return GLib.SOURCE_REMOVE if recording is None else GLib.SOURCE_CONTINUE
-    GLib.timeout_add_seconds(1, update_size_display)
+    begin_monitoring_file_size(find_size_display(stack), filename)
 
-    command = (['ffmpeg', '-framerate', '25'] + video_source(stack) +
-               ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
-    # pylint: disable=consider-using-with
-    recording = Stream(
-        process=subprocess.Popen(command, stdin=subprocess.PIPE))
+    recording = Stream.start(
+        ['ffmpeg', '-framerate', '25'] + video_source(stack) +
+        ['-f', 'pulse', '-ac', '2', '-i', 'default', filename])
     stack.set_visible_child_name("recording")