From 4868e16d65e92aa371e6ef2ae94122ac2dafd23e Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Wed, 17 May 2023 12:40:48 +0200
Subject: [sway] fix python based wallpapers by being more pythonic

---
 .config/sway/bin/wallpaper.py | 38 +++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/.config/sway/bin/wallpaper.py b/.config/sway/bin/wallpaper.py
index 9784625..1dad045 100755
--- a/.config/sway/bin/wallpaper.py
+++ b/.config/sway/bin/wallpaper.py
@@ -3,7 +3,7 @@
 
 import sys, os
 import argparse, json
-import random, subprocess, signal, time
+import random, re, subprocess, time
 
 
 """
@@ -18,7 +18,7 @@ parser = argparse.ArgumentParser(
 parser.add_argument(
     '--config',
     required=True,
-    help='{<weight>: { find: <path>, exclude: <path> }, <weight>:...}'
+    help='{"<weight>": { "find": "<path>", "exclude": "<regex>" }, "<weight>":...}'
 )
 
 parser.add_argument(
@@ -35,13 +35,13 @@ config = json.loads(args.config)
 " Program
 """
 
-pid_running = -1
+running_bg_process = None
 while True:
     probability_number = random.randrange(start=1, stop=100, step=1)
 
-    # build "find" command based on args.config
+    # 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
-    find_cmd = ''
+    selected_config = {}
     accumulative = 0
     for weight, wallpaper_path in config.items():
         lower_bound = accumulative
@@ -49,27 +49,35 @@ while True:
         upper_bound = accumulative
 
         if lower_bound <= probability_number and probability_number <= upper_bound:
-            find_cmd = 'find "{find}" -type f'.format(find=wallpaper_path['find'])
+            selected_config = wallpaper_path
+            break
 
-            if 'exclude' in wallpaper_path.keys():
-                find_cmd += ' -not -path "{exclude}"'.format(exclude=wallpaper_path['exclude'])
+    # 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}')
 
-            break
+    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 = f'swaybg -i $({find_cmd} | shuf -n1) -m fill &'
-    subprocess.run(swaybg_cmd, shell=True)
+    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 pid_running != -1:
-        os.kill(pid_running, signal.SIGTERM)
+    if running_bg_process:
+        running_bg_process.terminate()
 
-    # set pid for next iteration
-    pid_running = int(subprocess.check_output(['pidof', 'swaybg']))
+    # set running process for next iteration
+    running_bg_process = replacing_process
 
     # wait $INTERVAL seconds
     time.sleep(int(args.interval))
-- 
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