[sway] build script to enable auto-changing wallpapers

1 files changed, 75 insertions, 0 deletions

diff --git a/.config/sway/bin/wallpaper.py b/.config/sway/bin/wallpaper.py
new file mode 100755
index 0000000..9784625
--- /dev/null
+++ b/.config/sway/bin/wallpaper.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+
+
+import sys, os
+import argparse, json
+import random, subprocess, signal, time
+
+
+"""
+" CLI
+"""
+
+parser = argparse.ArgumentParser(
+    prog='wallpaper',
+    description='Cycle through wallpapers'
+)
+
+parser.add_argument(
+    '--config',
+    required=True,
+    help='{<weight>: { find: <path>, exclude: <path> }, <weight>:...}'
+)
+
+parser.add_argument(
+    '--interval',
+    default=600
+)
+
+args = parser.parse_args()
+
+config = json.loads(args.config)
+
+
+"""
+" Program
+"""
+
+pid_running = -1
+while True:
+    probability_number = random.randrange(start=1, stop=100, step=1)
+
+    # build "find" command based on args.config
+    # see https://stackoverflow.com/questions/16489449/select-element-from-array-with-probability-proportional-to-its-value/16490300#16490300
+    find_cmd = ''
+    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:
+            find_cmd = 'find "{find}" -type f'.format(find=wallpaper_path['find'])
+
+            if 'exclude' in wallpaper_path.keys():
+                find_cmd += ' -not -path "{exclude}"'.format(exclude=wallpaper_path['exclude'])
+
+            break
+
+    # run swaybg
+    swaybg_cmd = f'swaybg -i $({find_cmd} | shuf -n1) -m fill &'
+    subprocess.run(swaybg_cmd, shell=True)
+
+    # 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 pid_running != -1:
+        os.kill(pid_running, signal.SIGTERM)
+
+    # set pid for next iteration
+    pid_running = int(subprocess.check_output(['pidof', 'swaybg']))
+
+    # wait $INTERVAL seconds
+    time.sleep(int(args.interval))