color your LXDE taskbar on the weekend

taskbar_tint.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

##=========================================================
##  taskbar_tint.py                                Mar 2019
##
##  Eli Innis   @Doyousketch2      Doyousketch2 @ yahoo.com
##
##  GNU GPLv3                 gnu.org/licenses/gpl-3.0.html

"""  libs  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"""

import os
import sys                             ##  to retrieve args
import subprocess as sp           ##  commandline processes

""" vars  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"""

# ┌───────────── minute (0 - 59)
# │ ┌───────────── hour (0 - 23)
# │ │ ┌───────────── day of the month (1 - 31)
# │ │ │ ┌───────────── month (1 - 12)
# │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday;
# │ │ │ │ │                                   7 is also Sunday on some systems)
# │ │ │ │ │
# │ │ │ │ │
# * * * * * command to execute

'''
crontab -e

# 4 am  Mon
0 4 * * 1 ~/.config/lxpanel/taskbar_tint.py weekday

#  4 pm  Fri
0 16 * * 5 ~/.config/lxpanel/taskbar_tint.py weekend

'''

configdir = '~/.config/lxpanel/LXDE/panels/'
temp  = configdir +'temp'
panel = configdir +'panel'
bak   = panel +'.bak'

weekDay_color  = '#3465a4'
weekEnd_color  = '#75507b'

arg  = ''
if len( sys .argv ) > 1:
    arg  = sys .argv[1]

## https://stackoverflow.com/questions/55030437/how-can-i-change-one-line-in-text-file-with-python
## I feel like this can all be written to temp text, then output the entire contents in one go.
## I've done it before, but so tired right now, not looking up the specifics.

with open( panel, 'r' ) as data,  open( temp, 'w' ) as tmp:
    for line in data:
        if line .startswith( '  tintcolor' ):
            if arg == 'weekend':
                tmp .write( '  tintcolor=' +weekEnd_color )
            else:
                tmp .write( '  tintcolor=' +weekDay_color )
        else:
            tmp .write( line )

if os .path .isfile( bak ):
    os .remove( bak )

os .rename( panel, bak )
os .rename( temp,  panel )

sp .run( ['lxpanelctl', 'restart'] )