Feat: Scanlator-based Filtering & Directory Changes

src/lib/chapterList.ts

@@ -0,0 +1,34 @@
+import type { Chapter } from "./types";
+
+export function buildReaderChapterList(
+  chapters:   Chapter[],
+  mangaPrefs: { preferredScanlator?: string; scanlatorFilter?: string[] } | undefined,
+): Chapter[] {
+  const preferred = mangaPrefs?.preferredScanlator ?? "";
+  const filter    = mangaPrefs?.scanlatorFilter ?? [];
+
+  let base = [...chapters].sort((a, b) => a.sourceOrder - b.sourceOrder);
+
+  if (preferred) {
+    const pref: Chapter[] = [], rest: Chapter[] = [];
+    for (const c of base) (c.scanlator === preferred ? pref : rest).push(c);
+    base = [...pref, ...rest];
+  }
+
+  if (filter.length > 0) {
+    const seen = new Map<number, Chapter>();
+    for (const ch of base) {
+      const existing = seen.get(ch.chapterNumber);
+      if (!existing) {
+        seen.set(ch.chapterNumber, ch);
+      } else {
+        const np = filter.indexOf(ch.scanlator ?? "");
+        const op = filter.indexOf(existing.scanlator ?? "");
+        if (np !== -1 && (op === -1 || np < op)) seen.set(ch.chapterNumber, ch);
+      }
+    }
+    base = [...seen.values()].sort((a, b) => a.sourceOrder - b.sourceOrder);
+  }
+
+  return base;
+}