Model wallpaper display policies

2026-08-18 15:00:18 -04:00
parent 3e98cc2216
commit c8004e400a
4 changed files with 263 additions and 0 deletions
@@ -0,0 +1,97 @@
+function validPath(path, candidates) {
+    if (typeof path !== "string" || !/^\/[^,\n]+$/.test(path))
+        return false;
+    return (candidates || []).includes(path);
+}
+
+function validCollection(paths, candidates) {
+    const result = [];
+    const seen = {};
+    for (const path of paths || []) {
+        if (!validPath(path, candidates) || seen[path])
+            continue;
+        seen[path] = true;
+        result.push(path);
+    }
+    return result;
+}
+
+function validAssignments(assignments, candidates) {
+    const result = {};
+    if (!assignments || typeof assignments !== "object" || Array.isArray(assignments))
+        return result;
+    for (const output of Object.keys(assignments)) {
+        if (!/^[A-Za-z0-9_.-]+$/.test(output))
+            continue;
+        const path = assignments[output];
+        if (validPath(path, candidates))
+            result[output] = path;
+    }
+    return result;
+}
+
+function effectiveMap(mode, globalPath, slideshowPath, assignments, outputs, candidates) {
+    const result = {};
+    const fallback = validPath(globalPath, candidates)
+        ? globalPath
+        : ((candidates || [])[0] || "");
+    const selectedAssignments = validAssignments(assignments, candidates);
+    const slideshow = validPath(slideshowPath, candidates) ? slideshowPath : fallback;
+    for (const output of outputs || []) {
+        if (typeof output !== "string" || !/^[A-Za-z0-9_.-]+$/.test(output))
+            continue;
+        if (mode === "per-monitor")
+            result[output] = selectedAssignments[output] || fallback;
+        else if (mode === "slideshow")
+            result[output] = slideshow;
+        else
+            result[output] = fallback;
+    }
+    return result;
+}
+
+function orderedNext(collection, current) {
+    const paths = collection || [];
+    if (paths.length === 0)
+        return "";
+    const index = paths.indexOf(current);
+    return paths[(index + 1 + paths.length) % paths.length];
+}
+
+function shuffledBag(collection, random) {
+    const result = Array.from(collection || []);
+    const nextRandom = typeof random === "function" ? random : Math.random;
+    for (let index = result.length - 1; index > 0; index--) {
+        const swap = Math.floor(Math.max(0, Math.min(0.999999999, nextRandom())) * (index + 1));
+        const value = result[index];
+        result[index] = result[swap];
+        result[swap] = value;
+    }
+    return result;
+}
+
+function shuffledNext(collection, bag, current, random) {
+    const paths = Array.from(collection || []);
+    if (paths.length === 0)
+        return { path: "", bag: [] };
+
+    const remaining = [];
+    const seen = {};
+    for (const path of bag || []) {
+        if (!paths.includes(path) || seen[path])
+            continue;
+        seen[path] = true;
+        remaining.push(path);
+    }
+    if (remaining.length === 0)
+        remaining.push(...shuffledBag(paths, random));
+
+    if (remaining.length > 1 && remaining[0] === current) {
+        const replacement = remaining.findIndex(path => path !== current);
+        const value = remaining[0];
+        remaining[0] = remaining[replacement];
+        remaining[replacement] = value;
+    }
+
+    return { path: remaining[0], bag: remaining.slice(1) };
+}