feat: implement vacation responder functionality with UI integration and localization

app/[locale]/settings/page.tsx

@@ -130,6 +130,19 @@ export default function SettingsPage() {
     });
   }, [checkAuth]);
 
+  // Listen for tab change events from child components
+  useEffect(() => {
+    const handler = (e: Event) => {
+      const tab = (e as CustomEvent).detail as Tab;
+      if (tab) {
+        setActiveTab(tab);
+        try { localStorage.setItem('settings-active-tab', tab); } catch { /* ignore */ }
+      }
+    };
+    window.addEventListener('settings-tab-change', handler);
+    return () => window.removeEventListener('settings-tab-change', handler);
+  }, []);
+
   useEffect(() => {
     if (initialCheckDone && !isAuthenticated && !authLoading) {
       try { sessionStorage.setItem('redirect_after_login', window.location.pathname); } catch { /* ignore */ }

components/settings/filter-settings.tsx

@@ -12,6 +12,7 @@ import { useEmailStore } from "@/stores/email-store";
 import { useSettingsStore } from "@/stores/settings-store";
 import { toast } from "@/stores/toast-store";
 import type { FilterRule } from "@/lib/jmap/sieve-types";
+import { useVacationStore } from "@/stores/vacation-store";
 import {
   Plus,
   GripVertical,
@@ -21,6 +22,7 @@ import {
   Loader2,
   Filter,
   RotateCcw,
+  PalmtreeIcon,
 } from "lucide-react";
 
 function RuleSummary({ rule }: { rule: FilterRule }) {
@@ -137,6 +139,7 @@ export function FilterSettings() {
     isSupported,
     isOpaque,
     rawScript,
+    vacationSettings,
     fetchFilters,
     saveFilters,
     addRule,
@@ -149,6 +152,8 @@ export function FilterSettings() {
     validateScript,
   } = useFilterStore();
 
+  const vacationEnabled = useVacationStore((s) => s.isEnabled) || vacationSettings?.isEnabled;
+
   const [editingRule, setEditingRule] = useState<FilterRule | undefined>();
   const [showRuleModal, setShowRuleModal] = useState(false);
   const [showSieveEditor, setShowSieveEditor] = useState(false);
@@ -389,7 +394,33 @@ export function FilterSettings() {
           </div>
         )}
 
-        {!isOpaque && rules.length === 0 && (
+        {!isOpaque && vacationEnabled && (
+          <button
+            type="button"
+            onClick={() => {
+              try { localStorage.setItem('settings-active-tab', 'vacation'); } catch { /* ignore */ }
+              window.dispatchEvent(new CustomEvent('settings-tab-change', { detail: 'vacation' }));
+            }}
+            className="flex items-center gap-3 w-full p-3 rounded-md border border-green-200 dark:border-green-800 bg-green-50 dark:bg-green-900/20 hover:bg-green-100 dark:hover:bg-green-900/30 transition-colors text-left"
+          >
+            <div className="flex items-center justify-center w-8 h-8 rounded-full bg-green-100 dark:bg-green-900/40">
+              <PalmtreeIcon className="w-4 h-4 text-green-600 dark:text-green-400" />
+            </div>
+            <div className="flex-1 min-w-0">
+              <p className="text-sm font-medium text-green-700 dark:text-green-400">
+                {t("vacation_active")}
+              </p>
+              <p className="text-xs text-green-600/70 dark:text-green-400/70">
+                {t("vacation_active_description")}
+              </p>
+            </div>
+            <span className="text-xs text-green-600 dark:text-green-400 font-medium">
+              {t("vacation_configure")} &rarr;
+            </span>
+          </button>
+        )}
+
+        {!isOpaque && rules.length === 0 && !vacationEnabled && (
           <div className="flex flex-col items-center py-8 text-muted-foreground">
             <Filter className="w-10 h-10 mb-3 opacity-40" />
             <p className="text-sm">{t("no_rules")}</p>

lib/sieve/parser.ts

@@ -40,9 +40,53 @@ function isValidRule(rule: unknown): rule is FilterRule {
   return r.conditions.every(isValidCondition) && r.actions.every(isValidAction);
 }
 
+/**
+ * Detect Stalwart-generated vacation-only scripts (no metadata).
+ * These contain `vacation` command but no other filter logic we need to preserve.
+ */
+function detectVacationOnlyScript(content: string): ParseResult | null {
+  // Must contain a vacation command
+  if (!/\bvacation\b/.test(content)) return null;
+
+  // Strip requires, comments, and whitespace to see if only vacation remains
+  const stripped = content
+    .replace(/^\s*require\s+\[[^\]]*\]\s*;/gm, '')
+    .replace(/#[^\n]*/g, '')
+    .replace(/\/\*[\s\S]*?\*\//g, '')
+    .trim();
+
+  // After stripping, the only meaningful statement should be a vacation command.
+  // Check there are no if/elsif/else blocks (i.e., no filter rules).
+  if (/\b(?:if|elsif|else)\b/.test(stripped)) return null;
+
+  // Extract subject if present
+  const subjectMatch = stripped.match(/:subject\s+"((?:[^"\\]|\\.)*)"/); 
+  const subject = subjectMatch ? subjectMatch[1].replace(/\\"/g, '"').replace(/\\\\/g, '\\') : '';
+
+  // Extract the body text (last quoted string in the vacation command)
+  // Stalwart uses MIME format; extract the plain text after the MIME headers
+  const mimeBodyMatch = stripped.match(/Content-Transfer-Encoding:[^\n]*\n\n([\s\S]*?)"\s*;\s*$/);
+  const simpleBodyMatch = stripped.match(/vacation[^;]*"((?:[^"\\]|\\.)*)"\s*;\s*$/);
+  let textBody = '';
+  if (mimeBodyMatch) {
+    textBody = mimeBodyMatch[1].trim();
+  } else if (simpleBodyMatch) {
+    textBody = simpleBodyMatch[1].replace(/\\"/g, '"').replace(/\\\\/g, '\\');
+  }
+
+  return {
+    rules: [],
+    isOpaque: false,
+    vacation: { isEnabled: true, subject, textBody },
+  };
+}
+
 export function parseScript(content: string): ParseResult {
   const beginIdx = content.indexOf(METADATA_BEGIN);
-  if (beginIdx === -1) return OPAQUE;
+  if (beginIdx === -1) {
+    // No metadata — check if it's a Stalwart vacation-only script
+    return detectVacationOnlyScript(content) || OPAQUE;
+  }
 
   const endIdx = content.indexOf(METADATA_END, beginIdx);
   if (endIdx === -1) return OPAQUE;

locales/en/common.json

@@ -1187,6 +1187,9 @@
       "add_rule": "Add Rule",
       "no_rules": "No filter rules",
       "no_rules_description": "Create rules to automatically organize your incoming emails",
+      "vacation_active": "Vacation Responder is active",
+      "vacation_active_description": "Auto-reply is enabled for incoming messages",
+      "vacation_configure": "Configure",
       "edit_rule": "Edit Rule",
       "new_rule": "New Rule",
       "delete_rule": "Delete Rule",