Removing errors when swaybg is not installed

waypaper/__main__.py

@@ -7,7 +7,7 @@ import argparse
 from waypaper.config import Config
 from waypaper.app import App
 from waypaper.changer import change_wallpaper
-from waypaper.common import get_random_file
+from waypaper.common import get_random_file, check_missing_backends
 from waypaper.aboutdata import AboutData
 from waypaper.options import FILL_OPTIONS, BACKEND_OPTIONS
 from waypaper.translations import English, German, French, Russian, Polish, Chinese
@@ -44,6 +44,7 @@ def run():
     """Read user arguments and either run GUI app or just reset the wallpaper"""
 
     cf.read_parameters_from_user_arguments(args)
+    missing_backends = check_missing_backends()
 
     # Set the wallpaper and quit:
     if args.restore:
@@ -54,7 +55,7 @@ def run():
 
             if wallpaper is None:
                 continue
-            change_wallpaper(wallpaper, cf.fill_option, cf.color, cf.backend, monitor, cf.swww_transition, txt)
+            change_wallpaper(wallpaper, cf, monitor, txt, missing_backends)
             time.sleep(0.1)
         exit(0)
 

waypaper/app.py

@@ -3,7 +3,6 @@
 import subprocess
 import threading
 import os
-import shutil
 import gi
 from pathlib import Path
 from platformdirs import user_cache_path
@@ -12,7 +11,7 @@ from PIL import Image
 from waypaper.aboutdata import AboutData
 from waypaper.changer import change_wallpaper
 from waypaper.config import Config
-from waypaper.common import get_image_paths, get_random_file
+from waypaper.common import get_image_paths, get_random_file, check_missing_backends
 from waypaper.options import FILL_OPTIONS, BACKEND_OPTIONS, SORT_OPTIONS, SORT_DISPLAYS
 
 gi.require_version("Gtk", "3.0")
@@ -221,12 +220,7 @@ class App(Gtk.Window):
 
     def check_backends(self):
         """Before running the app, check which backends are installed"""
-        self.missing_backends = []
+        self.missing_backends = check_missing_backends()
-        for backend in BACKEND_OPTIONS:
-            if backend == "wallutils":
-                backend = "setwallpaper"
-            is_backend_missing = not bool(shutil.which(backend))
-            self.missing_backends.append(is_backend_missing)
 
         # Show error message if no backends are installed:
         if all(self.missing_backends):
@@ -411,8 +405,7 @@ class App(Gtk.Window):
         self.load_image_grid()
         print(self.txt.msg_path, self.cf.selected_wallpaper)
         self.cf.fill_option = self.fill_option_combo.get_active_text() or self.cf.fill_option
-        change_wallpaper(self.cf.selected_wallpaper, self.cf.fill_option, self.cf.color,
+        change_wallpaper(self.cf.selected_wallpaper, self.cf, self.cf.selected_monitor, self.txt, self.missing_backends)
-                         self.cf.backend, self.cf.selected_monitor, self.cf.swww_transition, self.txt)
         self.cf.save()
 
 
@@ -438,8 +431,7 @@ class App(Gtk.Window):
             return
         print(self.txt.msg_path, self.cf.selected_wallpaper)
         self.cf.fill_option = self.fill_option_combo.get_active_text() or self.cf.fill_option
-        change_wallpaper(self.cf.selected_wallpaper, self.cf.fill_option, self.cf.color,
+        change_wallpaper(self.cf.selected_wallpaper, self.cf, self.cf.selected_monitor, self.txt, self.missing_backends)
-                         self.cf.backend, self.cf.selected_monitor, self.cf.swww_transition, self.txt)
         self.cf.save()
 
 
@@ -506,8 +498,7 @@ class App(Gtk.Window):
             self.cf.selected_wallpaper = wallpaper_path
             print(self.txt.msg_path, self.cf.selected_wallpaper)
             self.cf.fill_option = self.fill_option_combo.get_active_text() or self.cf.fill_option
-            change_wallpaper(self.cf.selected_wallpaper, self.cf.fill_option, self.cf.color,
+            change_wallpaper(self.cf.selected_wallpaper, self.cf, self.cf.selected_monitor, self.txt, self.missing_backends)
-                             self.cf.backend, self.cf.selected_monitor, self.cf.swww_transition, self.txt)
             self.cf.save()
 
         # Prevent other default key handling:

waypaper/changer.py

@@ -3,10 +3,17 @@
 import subprocess
 import time
 
+from waypaper.options import BACKEND_OPTIONS
 
-def change_wallpaper(image_path, fill_option, color, backend, monitor, transition, txt):
+
+def change_wallpaper(image_path, cf, monitor, txt, missing_backends):
     """Run a system command to change the wallpaper depending on the backend"""
 
+    fill_option = cf.fill_option
+    color = cf.color
+    backend = cf.backend
+    swww_transition = cf.swww_transition
+
     try:
         # swaybg backend:
         if backend == "swaybg":
@@ -34,16 +41,19 @@ def change_wallpaper(image_path, fill_option, color, backend, monitor, transitio
                     "tile": "no",
                     }
             fill = fill_types[fill_option.lower()]
-            try:
+            is_swaybg_installed = not missing_backends[BACKEND_OPTIONS.index("swaybg")]
-                subprocess.Popen(["killall", "swaybg"])
+            if is_swaybg_installed:
-                time.sleep(0.005)
+                try:
-            except Exception as e:
+                    subprocess.Popen(["killall", "swaybg"])
-                print(f"{ERR_KILL} {e}")
+                    time.sleep(0.005)
+                except Exception as e:
+                    print(f"{ERR_KILL} {e}")
+            print(missing_backends)
             subprocess.Popen(["swww", "init"])
             command = ["swww", "img", image_path]
             command.extend(["--resize", fill])
             command.extend(["--fill-color", color])
-            command.extend(["--transition-type", transition])
+            command.extend(["--transition-type", swww_transition])
             # command.extend(["--transition-step", str(30)])
             if monitor != "All":
                 command.extend(["--outputs", monitor])

waypaper/common.py

@@ -2,8 +2,9 @@
 
 import os
 import random
+import shutil
 
-from waypaper.options import IMAGE_EXTENSIONS
+from waypaper.options import IMAGE_EXTENSIONS, BACKEND_OPTIONS
 
 def has_image_extension(file_path, backend):
     """Check if the file has image extension"""
@@ -35,3 +36,14 @@ def get_random_file(folder, include_subfolders):
         return random.choice(image_paths)
     except:
         return None
+
+
+def check_missing_backends():
+    """Check which backends are installed in the system"""
+    missing_backends = []
+    for backend in BACKEND_OPTIONS:
+        if backend == "wallutils":
+            backend = "setwallpaper"
+        is_backend_missing = not bool(shutil.which(backend))
+        missing_backends.append(is_backend_missing)
+    return missing_backends