Kitty terminal closing Intercept about kitty HOT 3 CLOSED

You cannot intercept signals sent to other processes. What is your
actual use case.

from kitty.

I am doing this to build a tui which helps manages session and easily configure the terminal:

i would like to build a script which saves the session data for a particular kitty terminal instance. we have inbuilt commands like kitty @ ls which help us do this. i built a python kitten script which looks something like this:

from typing import List
import json
import os
from kitty.boss import Boss

def main(args: List[str]) -> str:
    pass

from kittens.tui.handler import result_handler
@result_handler(no_ui=True)
def handle_result(args: List[str], answer: str, target_window_id: int, boss: Boss) -> None:
    w = boss.window_id_map.get(target_window_id)
    if w is not None:
        json_data_str = boss.call_remote_control(w, ('ls', f'--match=id:{w.id}'))
        json_data = json.loads(json_data_str)
        # Define the file path
        home_dir = os.path.expanduser("~")
        
        # Define the file path with the correct username
        file_path = os.path.join(home_dir, '.config','kitty', 'lastsession.kitty')        
        # Check if the file exists
        if not os.path.exists(file_path):
            # If the file doesn't exist, create a new one
            with open(file_path, 'w') as f:
                json.dump({}, f)  # Write an empty JSON object
        
        # Write JSON data to the file
        with open(file_path, 'w') as f:
            json.dump(json_data, f)
    boss.close_tab()

this is the simplified version but i have more ifs and else which check for different arguments incoming. i have also mapped some shortcuts in my kitty config file as follows:

map ctrl+shift+q kitten autosave.py close_tab
map ctrl+shift+w kitten autosave.py close_window

i tried the same for alt+f4 which is a common way of closing the terminal, but no dice. Then as i researched more i found that if i am 'trapping' the SIGTERM signal for the kitty instance it would cover the whole "accidentally closing terminal edge case" instead of me handling each individual closing separately.

Any help would be useful.

from kitty.

If you want to perform special actions on window close events, you use
the watcher infrastructure in kitty
https://sw.kovidgoyal.net/kitty/conf/#opt-kitty.watcher

You absolutely cannot handle signals in your code. signals are an
asynchronous, global mechanism.

from kitty.