Make the code about showing notification reusable

[anki-code]

I want to use the notification feature in https://github.com/anki-code/xontrib-prompt-starship

[jnoortheen]

It is using notify-py library. What do you want to be separated?

[anki-code]

This part around focus checking:

xontrib-cmd-durations/xontrib/cmd_done.py

Lines 119 to 142 in c4101bb

	def is_app_window_focused():
	# https://stackoverflow.com/questions/10266281/obtain-active-window-using-python
	if is_darwin_system():
	return _darwin_is_app_window_focused()
	if is_linux_system():
	return _linux_is_app_window_focused()
	return False
	def notify_user(hist, readable: str):
	rtn = hist.rtns[-1]
	cmd = hist.inps[-1]
	if is_app_window_focused():
	return
	from notifypy import Notify
	noti = Notify()
	noti.application_name = xsh.shell.prompt_formatter(NOTIFICATION_APP_NAME)
	noti.title = str(f"{cmd}")
	noti.message = f'{"Failed" if rtn else "Done"} in {readable}'
	noti.send()

To have:

from xontrib.cmd_done.notify import notify_user_if_unfocused

[jnoortheen]

I think it is better to copy-paste.

[anki-code]

It will be cool to have the functionality about detecting focus of the window as a library.