Tray icon showing status of a watch-like command

webpack_tray.py

#!/usr/bin/env python3

import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)

from PySide6.QtGui import QIcon
from PySide6.QtWidgets import QApplication, QSystemTrayIcon

import re
import sys
import threading

if __name__ == '__main__':
    app = QApplication([])
    app.setQuitOnLastWindowClosed(False)

    PROCESSING_ICON = QIcon('/usr/share/icons/Adwaita/24x24/emblems/emblem-synchronizing-symbolic.symbolic.png')
    SUCCESS_ICON = QIcon('/usr/share/icons/Adwaita/24x24/emblems/emblem-ok-symbolic.symbolic.png')
    FAILURE_ICON = QIcon('/usr/share/icons/Adwaita/24x24/emblems/emblem-important-symbolic.symbolic.png')

    SUCCESS_PAT = re.compile('Compiled successfully')
    FAILURE_PAT = re.compile('Failed to compile')

    TOOLTIP = "Webpack build status"

    def reader(tray):
        for line in sys.stdin:
            sys.stdout.write(line)
            if line.strip() == '':
                continue
            if re.search(SUCCESS_PAT, line) is not None:
                tray.setIcon(SUCCESS_ICON)
                continue
            if re.search(FAILURE_PAT, line) is not None:
                tray.setIcon(FAILURE_ICON)
                continue
            
            tray.setIcon(PROCESSING_ICON)


    tray = QSystemTrayIcon()
    tray.setIcon(PROCESSING_ICON)
    tray.setVisible(True)
    thread = threading.Thread(target=reader, args=(tray,), daemon=True)
    thread.start()
    app.exec()