feat(userscript): add kagane.to site adapter

userscript/test/logic.test.js

@@ -57,6 +57,7 @@ const {
   asura,
   demonic,
   comix,
+  kagane,
   anchorsFromHTML,
   statusOf,
 } = require("../manga-bookmark.user.js");
@@ -274,6 +275,90 @@ test("asura and demonic ignore the seriesId argument", () => {
   });
 });
 
+// ============================================================
+// kagane — reader URLs carry uuids and no chapter number, so the number has to
+// come out of og:title. When that fails, chapterNum is null and the existing
+// progress logic records the current chapter rather than guessing.
+// ============================================================
+
+const KAGANE_SERIES = "019f84bc-9ba0-7ed9-86f5-8b905ec7c28b";
+const KAGANE_BOOK = "019fa2e0-6dbd-73ca-b40b-fe06ab75eb0e";
+
+test("kagane detects a series page", () => {
+  metaTags = {
+    "og:title": "Infinite Decryption: The Strongest Level 0",
+    "og:image": "https://kagane.to/api/v2/image/abc/compressed",
+  };
+  const p = kagane.detect(loc("https://kagane.to/series/" + KAGANE_SERIES));
+  assert.equal(p.type, "series");
+  assert.equal(p.site, "kagane");
+  assert.equal(p.seriesId, KAGANE_SERIES);
+  assert.equal(p.title, "Infinite Decryption: The Strongest Level 0");
+  assert.equal(p.cover, "https://kagane.to/api/v2/image/abc/compressed");
+  assert.equal(p.seriesUrl, "https://kagane.to/series/" + KAGANE_SERIES);
+});
+
+test("kagane reads the chapter number out of og:title", () => {
+  metaTags = {
+    "og:title": "Infinite Decryption: The Strongest Level 0 - Chapter 41 - Episode 41",
+    "og:image": "https://kagane.to/api/v2/image/abc/compressed",
+  };
+  const p = kagane.detect(
+    loc("https://kagane.to/series/" + KAGANE_SERIES + "/reader/" + KAGANE_BOOK)
+  );
+  assert.equal(p.type, "chapter");
+  assert.equal(p.seriesId, KAGANE_SERIES);
+  assert.equal(p.title, "Infinite Decryption: The Strongest Level 0");
+  assert.equal(p.chapterNum, 41);
+  assert.equal(p.chapterLabel, "Chapter 41");
+  assert.equal(p.seriesUrl, "https://kagane.to/series/" + KAGANE_SERIES);
+});
+
+test("kagane yields a null chapterNum when og:title has no chapter", () => {
+  metaTags = { "og:title": "Infinite Decryption: The Strongest Level 0" };
+  const p = kagane.detect(
+    loc("https://kagane.to/series/" + KAGANE_SERIES + "/reader/" + KAGANE_BOOK)
+  );
+  assert.equal(p.type, "chapter");
+  assert.equal(p.chapterNum, null);
+});
+
+test("kagane ignores unrelated paths", () => {
+  assert.equal(kagane.detect(loc("https://kagane.to/search")).type, "other");
+});
+
+test("kagane anchor scanning is structurally impossible and returns null", () => {
+  const anchors = anchorsFromHTML(
+    `<a href="/series/${KAGANE_SERIES}/reader/${KAGANE_BOOK}">Chapter 41</a>`
+  );
+  assert.equal(kagane.latestChapterFromAnchors(anchors, KAGANE_SERIES), null);
+});
+
+test("kagane latestChapterFromApi takes the max chapter_no", async () => {
+  globalThis.fetch = async (url) => {
+    assert.equal(url, "/api/v2/series/" + KAGANE_SERIES);
+    return {
+      ok: true,
+      json: async () => ({
+        series_books: [
+          { chapter_no: "1", title: "Episode 1" },
+          { chapter_no: "41", title: "Episode 41" },
+          { chapter_no: "40.5", title: "Episode 40.5" },
+        ],
+      }),
+    };
+  };
+  assert.deepEqual(await kagane.latestChapterFromApi(KAGANE_SERIES), {
+    num: 41,
+    label: "Chapter 41",
+  });
+});
+
+test("kagane latestChapterFromApi returns null on a challenge or error", async () => {
+  globalThis.fetch = async () => ({ ok: false, status: 403 });
+  assert.equal(await kagane.latestChapterFromApi(KAGANE_SERIES), null);
+});
+
 // ============================================================
 // Shared helpers
 // ============================================================