From cc681d0f59c8859ba778d2c6c9315e024c759405 Mon Sep 17 00:00:00 2001
From: Daniel Weipert <code@drogueronin.de>
Date: Tue, 6 Jun 2023 11:11:46 +0200
Subject: [sway] add --unique flag to wallpaper script to not cycle through the
 same wallpaper twice per available files

---
 .config/sway/bin/wallpaper.py | 44 ++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 39 insertions(+), 5 deletions(-)

(limited to '.config/sway/bin')

diff --git a/.config/sway/bin/wallpaper.py b/.config/sway/bin/wallpaper.py
index 1dad045..449e5f3 100755
--- a/.config/sway/bin/wallpaper.py
+++ b/.config/sway/bin/wallpaper.py
@@ -26,6 +26,11 @@ parser.add_argument(
     default=600
 )
 
+parser.add_argument(
+    '--unique',
+    default=False
+)
+
 args = parser.parse_args()
 
 config = json.loads(args.config)
@@ -35,6 +40,14 @@ config = json.loads(args.config)
 " Program
 """
 
+# set variables for --unique flag
+already_selected_file_paths = {}
+if args.unique:
+    for weight, config_item in config.items():
+        config[weight]['id'] = hash(json.dumps(config_item, sort_keys=True))
+        already_selected_file_paths[config_item['id']] = []
+
+# run the loop
 running_bg_process = None
 while True:
     probability_number = random.randrange(start=1, stop=100, step=1)
@@ -43,29 +56,50 @@ while True:
     # 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():
+    for weight, config_item 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
+            selected_config = config_item
             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 dirpath, dirnames, filenames in os.walk(os.path.expandvars(selected_config['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)),
+            lambda file_path: (not re.match(os.path.expandvars(selected_config['exclude']), file_path)),
             found_file_paths
         ))
 
+    if args.unique:
+        # filter file paths from already selected paths
+        filtered_file_paths = [
+            item
+            for item in found_file_paths
+            if item not in already_selected_file_paths[selected_config['id']]
+        ]
+
+        # if we cycled through all of them, repeat
+        if not filtered_file_paths:
+            filtered_file_paths = found_file_paths
+            already_selected_file_paths[selected_config['id']] = []
+
+        found_file_paths = filtered_file_paths
+
+    # select file
+    selected_file_path = random.choice(found_file_paths)
+
+    if args.unique:
+        already_selected_file_paths[selected_config['id']].append(selected_file_path)
+
     # run swaybg
-    swaybg_cmd = ['swaybg', '-i', random.choice(found_file_paths), '-m', 'fill']
+    swaybg_cmd = ['swaybg', '-i', selected_file_path, '-m', 'fill']
     replacing_process = subprocess.Popen(swaybg_cmd)
 
     # wait until new instance of swaybg has booted up properly
-- 
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