fix(build): generate Suwayomi WebUI revision

src/features/theme/services/MaterialYouRevision.test.ts

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+import assert from 'node:assert/strict';
+import { describe, it } from 'node:test';
+import { formatWebUIRevision } from '@/features/theme/services/MaterialYouRevision.ts';
+
+describe('formatWebUIRevision', () => {
+    it('matches the revision format required by Suwayomi custom WebUI builds', () => {
+        assert.equal(formatWebUIRevision(3356), 'r3356\n');
+    });
+
+    it('rejects invalid git commit counts', () => {
+        assert.throws(() => formatWebUIRevision(0), /positive integer/);
+        assert.throws(() => formatWebUIRevision(4.5), /positive integer/);
+    });
+});

src/features/theme/services/MaterialYouRevision.ts

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+export const formatWebUIRevision = (commitCount: number): string => {
+    if (!Number.isInteger(commitCount) || commitCount < 1) {
+        throw new Error('WebUI revision commit count must be a positive integer');
+    }
+
+    return `r${commitCount}\n`;
+};