Update math chapter weights, enhance content clarity in directed numbers section, and add new curriculum category for Foundation. Implement chapter navigation improvements and style updates for better user experience across the platform.

scripts/sync-chapters.ts

@@ -6,6 +6,7 @@ import { $ } from "bun";
 const ROOT = join(import.meta.dir, "..");
 const CONTENT = join(ROOT, "content");
 const GENERATED_META = join(ROOT, "data/_generated/chapters-meta.json");
+const GENERATED_NAV = join(ROOT, "data/_generated/chapter-nav.json");
 const GENERATED_WIDGETS = join(ROOT, "frontend/src/generated/chapter-widgets.ts");
 const STATIC_ROOT = join(ROOT, "static");
 const CHAPTER_CSS_DIR = join(STATIC_ROOT, "css/chapters");
@@ -19,6 +20,30 @@ type ChaptersMetaFile = {
   chapters: Record<string, ChapterMeta>;
 };
 
+type CurriculumChapter = {
+  slug: string;
+  title: string;
+  status: "live" | "planned";
+};
+
+type CurriculumFile = {
+  strands: Array<{ chapters: CurriculumChapter[] }>;
+};
+
+type NavLink = {
+  slug: string;
+  title: string;
+};
+
+type ChapterNavEntry = {
+  prev: NavLink | null;
+  next: NavLink | null;
+};
+
+type ChapterNavFile = {
+  byKey: Record<string, ChapterNavEntry>;
+};
+
 function parseChapterTemplate(markdown: string): boolean {
   return /template\s*=\s*["']chapter\.html["']/.test(markdown);
 }
@@ -167,6 +192,41 @@ async function syncChapter(chapter: {
   return { key, meta: { hasSupplement, hasCss }, widgets };
 }
 
+async function buildChapterNav(
+  discovered: Array<{ subject: string; slug: string }>
+): Promise<ChapterNavFile> {
+  const discoveredSet = new Set(discovered.map((c) => `${c.subject}/${c.slug}`));
+  const byKey: Record<string, ChapterNavEntry> = {};
+  const subjects = [...new Set(discovered.map((c) => c.subject))];
+
+  for (const subject of subjects) {
+    const curriculumPath = join(ROOT, "data", `${subject}-curriculum.json`);
+    if (!existsSync(curriculumPath)) continue;
+
+    const curriculum = JSON.parse(await readFile(curriculumPath, "utf8")) as CurriculumFile;
+    const sequence: NavLink[] = [];
+
+    for (const strand of curriculum.strands) {
+      for (const chapter of strand.chapters) {
+        if (chapter.status !== "live") continue;
+        const key = `${subject}/${chapter.slug}`;
+        if (!discoveredSet.has(key)) continue;
+        sequence.push({ slug: chapter.slug, title: chapter.title });
+      }
+    }
+
+    for (let i = 0; i < sequence.length; i++) {
+      const key = `${subject}/${sequence[i].slug}`;
+      byKey[key] = {
+        prev: i > 0 ? sequence[i - 1] : null,
+        next: i < sequence.length - 1 ? sequence[i + 1] : null,
+      };
+    }
+  }
+
+  return { byKey };
+}
+
 function buildWidgetRegistry(
   entries: Array<{ key: string; widgets: string[]; dir: string }>
 ): string {
@@ -210,6 +270,9 @@ async function main() {
   await mkdir(dirname(GENERATED_WIDGETS), { recursive: true });
   await writeFile(GENERATED_WIDGETS, buildWidgetRegistry(widgetEntries));
 
+  const chapterNav = await buildChapterNav(chapters);
+  await writeFile(GENERATED_NAV, `${JSON.stringify(chapterNav, null, 2)}\n`);
+
   console.log(`Synced ${chapters.length} chapter(s).`);
 }