Change terminal profile based on dark mode in macOS Catalina

dark_mode.py

#!/usr/bin/python3
import asyncio
import sys

SCRIPT = """
tell application "Terminal"
    set default settings to settings set "{}"
end tell

tell application "Terminal"
    set current settings of tabs of windows to settings set "{}"
end tell
"""

THEMES = {
    True: "One Dark",
    False: "One Light",
}

async def get_mode():
    proc = await asyncio.create_subprocess_exec(
        *["defaults", "read", "-g", "AppleInterfaceStyle"],
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )
    out_data = await proc.stdout.readline()
    return out_data.decode()

async def set_terminal_theme(output):
    osascript = SCRIPT.format(THEMES["Dark" in output])
    await asyncio.create_subprocess_exec(*["osascript", "-e", osascript])

async def main(input):
    while len(input)>1:
        out = await get_mode()
        await set_terminal_theme(out)
        await asyncio.sleep(5)

if __name__ == "__main__":
    loop = asyncio.get_event_loop()
    try:
        loop.run_until_complete(main(sys.argv))
    except KeyboardInterrupt:
        pass
    finally:
        loop.close()