wallpaper: optimize caching and performance of wallpaper tab

quickshell/Common/CacheUtils.qml

@@ -7,62 +7,17 @@ import qs.Common
 Singleton {
     id: root
 
-    // Filenames present on disk, so CachingImage never points an Image at a
-    // missing cache file (Qt logs that as a "Cannot open" warning).
-    property var cachedFiles: ({})
-
-    Component.onCompleted: scan()
-
-    function scan() {
-        Proc.runCommand("imagecache_scan", ["ls", "-1", Paths.stringify(Paths.imagecache)], function (output, exitCode) {
-            const map = {};
-            if (exitCode === 0 && output) {
-                const lines = output.split("\n");
-                for (var i = 0; i < lines.length; i++) {
-                    const name = lines[i].trim();
-                    if (name)
-                        map[name] = true;
-                }
-            }
-            root.cachedFiles = map;
-        });
-    }
-
-    function hasCachedFile(name) {
-        return name ? root.cachedFiles[name] === true : false;
-    }
-
-    function recordCachedFile(name) {
-        if (name)
-            root.cachedFiles[name] = true;
-    }
-
-    function forgetCachedFile(name) {
-        if (name && root.cachedFiles[name] !== undefined)
-            delete root.cachedFiles[name];
-    }
-
     function clearImageCache() {
         Quickshell.execDetached(["rm", "-rf", Paths.stringify(Paths.imagecache)]);
         Paths.mkdir(Paths.imagecache);
-        root.cachedFiles = ({});
     }
 
     function clearOldCache(ageInMinutes) {
-        // Rescan on delete completion since we can't know which files matched.
-        Proc.runCommand("imagecache_prune", ["find", Paths.stringify(Paths.imagecache), "-name", "*.png", "-mmin", `+${ageInMinutes}`, "-delete"], function (output, exitCode) {
-            root.scan();
-        });
+        Quickshell.execDetached(["find", Paths.stringify(Paths.imagecache), "-name", "*.png", "-mmin", `+${ageInMinutes}`, "-delete"]);
     }
 
     function clearCacheForSize(size) {
         Quickshell.execDetached(["find", Paths.stringify(Paths.imagecache), "-name", `*@${size}x${size}.png`, "-delete"]);
-        const suffix = `@${size}x${size}.png`;
-        const map = {};
-        for (const key in root.cachedFiles)
-            if (!key.endsWith(suffix))
-                map[key] = true;
-        root.cachedFiles = map;
     }
 
     function getCacheSize(callback) {

quickshell/Common/Paths.qml

@@ -3,6 +3,7 @@ pragma ComponentBehavior: Bound
 
 import Quickshell
 import QtCore
+import QtQuick
 import qs.Services
 
 Singleton {
@@ -19,6 +20,8 @@ Singleton {
 
     readonly property url imagecache: `${cache}/imagecache`
 
+    Component.onCompleted: mkdir(imagecache)
+
     function stringify(path: url): string {
         return path.toString().replace(/%20/g, " ");
     }