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#!/usr/bin/env python
import sys, os
import argparse, json
import random, re, subprocess, time
"""
" CLI
"""
parser = argparse.ArgumentParser(
prog='wallpaper',
description='Cycle through wallpapers'
)
parser.add_argument(
'--config',
required=True,
help='{"<weight>": { "find": "<path>", "exclude": "<regex>" }, "<weight>":...}'
)
parser.add_argument(
'--interval',
default=600
)
args = parser.parse_args()
config = json.loads(args.config)
"""
" Program
"""
running_bg_process = None
while True:
probability_number = random.randrange(start=1, stop=100, step=1)
# select config to use based on args.config
# see https://stackoverflow.com/questions/16489449/select-element-from-array-with-probability-proportional-to-its-value/16490300#16490300
selected_config = {}
accumulative = 0
for weight, wallpaper_path in config.items():
lower_bound = accumulative
accumulative += int(weight)
upper_bound = accumulative
if lower_bound <= probability_number and probability_number <= upper_bound:
selected_config = wallpaper_path
break
# build list of file paths to choose from
found_file_paths = []
for dirpath, dirnames, filenames in os.walk(os.path.expandvars(wallpaper_path['find'])):
for filename in filenames:
found_file_paths.append(f'{dirpath}/{filename}')
if 'exclude' in selected_config.keys():
found_file_paths = list(filter(
lambda file_path: (not re.match(os.path.expandvars(wallpaper_path['exclude']), file_path)),
found_file_paths
))
# run swaybg
swaybg_cmd = ['swaybg', '-i', random.choice(found_file_paths), '-m', 'fill']
replacing_process = subprocess.Popen(swaybg_cmd)
# wait until new instance of swaybg has booted up properly
time.sleep(5)
# kill the previous process
# the new swaybg process takes its place automatically
if running_bg_process:
running_bg_process.terminate()
# set running process for next iteration
running_bg_process = replacing_process
# wait $INTERVAL seconds
time.sleep(int(args.interval))
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