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fix(cli): reduce spinner flickering under patch_stdout

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KawaiiSpinner used a two-phase clear+redraw approach: first write
\r + spaces to blank the line, then \r + new frame. When running
inside prompt_toolkit's patch_stdout proxy, each phase could trigger
a separate repaint, causing visible flickering every 120ms.

Replace with a single \r\033[K (carriage return + ANSI erase-to-EOL)
write so the line is cleared and redrawn atomically.
This commit is contained in:
0xbyt4 2026-02-26 23:55:07 +03:00
parent bf9dd83c10
commit f92875bc3e
1 changed files with 4 additions and 3 deletions
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7
agent/display.py
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@ -182,8 +182,9 @@ class KawaiiSpinner:
frame = self.spinner_frames[self.frame_idx % len(self.spinner_frames)] frame = self.spinner_frames[self.frame_idx % len(self.spinner_frames)]
elapsed = time.time() - self.start_time elapsed = time.time() - self.start_time
line = f" {frame} {self.message} ({elapsed:.1f}s)" line = f" {frame} {self.message} ({elapsed:.1f}s)"
clear = '\r' + ' ' * self.last_line_len + '\r' # Use \r + ANSI erase-to-EOL in a single write to avoid the
self._write(clear + line, end='', flush=True) # two-phase clear+redraw that flickers under patch_stdout.
self._write(f"\r\033[K{line}", end='', flush=True)
self.last_line_len = len(line) self.last_line_len = len(line)
self.frame_idx += 1 self.frame_idx += 1
time.sleep(0.12) time.sleep(0.12)
@ -203,7 +204,7 @@ class KawaiiSpinner:
self.running = False self.running = False
if self.thread: if self.thread:
self.thread.join(timeout=0.5) self.thread.join(timeout=0.5)
self._write('\r' + ' ' * (self.last_line_len + 5) + '\r', end='', flush=True) self._write('\r\033[K', end='', flush=True)
if final_message: if final_message:
self._write(f" {final_message}", flush=True) self._write(f" {final_message}", flush=True)