.. _darknight_example:

Change Color Preset by Time of Day
==================================

The script changes the color preset based on time of day. Edit the constants at the top to customize it for your needs.

.. code-block:: python

    #!/usr/bin/env python3.7

    import asyncio
    import datetime
    import iterm2

    # Clock time to change colors.
    LIGHT_TIME=(7, 0)
    DARK_TIME=(16, 0)

    # Color presets to use
    LIGHT_PRESET_NAME="Light Background"
    DARK_PRESET_NAME="Dark Background"

    # Profiles to update
    PROFILES=["Default"]

    def datetime_after(t, time):
	today = datetime.datetime(t.year, t.month, t.day, time[0], time[1])
	if today > t:
	    return today
	# Same time tomorrow
	return today + datetime.timedelta(1)


    def next_deadline_after(t):
	light_deadline = datetime_after(t, LIGHT_TIME)
	dark_deadline = datetime_after(t, DARK_TIME)
	if light_deadline < dark_deadline:
	    return (LIGHT_PRESET_NAME, light_deadline)
	return (DARK_PRESET_NAME, dark_deadline)

    def get_duration():
	now = datetime.datetime.now()
	preset_name, deadline = next_deadline_after(now)
	duration = (deadline - now).seconds
	print("Sleep for {} seconds until {}".format(duration, deadline))
	return duration, preset_name

    async def set_colors(connection, preset_name):
	print("Change to preset {}".format(preset_name))
	preset = await iterm2.ColorPreset.async_get(connection, preset_name)
	for partial in (await iterm2.PartialProfile.async_query(connection)):
	    if partial.name in PROFILES:
		await partial.async_set_color_preset(preset)

    async def main(connection):
	while True:
	    duration, preset_name = get_duration()
	    await asyncio.sleep(duration)
	    await set_colors(connection, preset_name)
	    await asyncio.sleep(1)

    iterm2.run_forever(main)

:Download:`Download<darknight.its>`