pw/astro.config.mjs

import { defineConfig } from 'astro/config';
import sitemap from '@astrojs/sitemap';
import AstroPWA from '@vite-pwa/astro';
import tailwindcss from '@tailwindcss/vite';
import { execFileSync } from 'node:child_process';
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const ROOT = path.dirname(fileURLToPath(import.meta.url));

// ── lastmod til sitemap ────────────────────────────────────────────────────────
// Google bruger kun lastmod hvis den er troværdig, så vi gætter aldrig: statiske
// sider får datoen for deres SIDSTE COMMIT, blogindlæg får updated/date fra
// frontmatter, og alt vi ikke kan datere præcist får slet ingen lastmod.
// NB: kræver fuld git-historik — deploy-workflowen bruger fetch-depth: 0.
// Er historikken shallow (eller mangler .git), falder vi stille tilbage til
// "ingen lastmod" i stedet for at udgive en forkert dato.

const gitLastModified = (file) => {
  try {
    const out = execFileSync('git', ['log', '-1', '--format=%cI', '--', file], {
      cwd: ROOT,
      encoding: 'utf8',
      stdio: ['ignore', 'pipe', 'ignore'],
    }).trim();
    return out || null;
  } catch {
    return null;
  }
};

// Shallow clone => hver fil ser ud til at være ændret i den ene commit vi har.
// Så er datoerne værdiløse, og vi dropper lastmod helt.
const gitHistoryIsUsable = (() => {
  try {
    const n = execFileSync('git', ['rev-list', '--count', 'HEAD'], {
      cwd: ROOT,
      encoding: 'utf8',
      stdio: ['ignore', 'pipe', 'ignore'],
    }).trim();
    return Number(n) > 1;
  } catch {
    return false;
  }
})();

const walk = (dir) =>
  fs.existsSync(dir)
    ? fs.readdirSync(dir, { withFileTypes: true }).flatMap((e) => {
        const p = path.join(dir, e.name);
        return e.isDirectory() ? walk(p) : [p];
      })
    : [];

// src/pages/foo.astro -> /foo/ ; src/pages/index.astro -> / ; [dynamiske] springes over
const routeForPage = (file) => {
  const rel = path.relative(path.join(ROOT, 'src/pages'), file).replace(/\\/g, '/');
  if (rel.includes('[') || rel.startsWith('404.')) return null;
  if (!rel.endsWith('.astro')) return null;
  const noExt = rel.slice(0, -'.astro'.length);
  if (noExt === 'index') return '/';
  return `/${noExt.replace(/\/index$/, '')}/`;
};

// Minimal frontmatter-læsning — vi skal kun bruge date/updated/tags/draft.
const readFrontmatter = (file) => {
  const src = fs.readFileSync(file, 'utf8');
  const m = src.match(/^---\r?\n([\s\S]*?)\r?\n---/);
  if (!m) return {};
  const fm = {};
  for (const line of m[1].split(/\r?\n/)) {
    const kv = line.match(/^(\w+):\s*(.*)$/);
    if (!kv) continue;
    const [, k, rawv] = kv;
    const v = rawv.trim().replace(/^['"]|['"]$/g, '');
    if (k === 'tags') {
      const inline = v.match(/^\[(.*)\]$/);
      fm.tags = inline
        ? inline[1].split(',').map((t) => t.trim().replace(/^['"]|['"]$/g, '')).filter(Boolean)
        : [];
    } else {
      fm[k] = v;
    }
  }
  return fm;
};

const iso = (v) => {
  const d = new Date(v);
  return Number.isNaN(d.getTime()) ? null : d.toISOString();
};
const newest = (dates) => dates.filter(Boolean).sort().at(-1) ?? null;

const buildLastmodMap = () => {
  const map = new Map();
  if (!gitHistoryIsUsable) return map;

  for (const file of walk(path.join(ROOT, 'src/pages'))) {
    const route = routeForPage(file);
    if (!route) continue;
    const d = gitLastModified(file);
    if (d) map.set(route, d);
  }

  // Blogindlæg: frontmatter er sandheden om hvornår indholdet sidst ændrede sig.
  const postDates = [];
  const tagDates = new Map();
  for (const file of walk(path.join(ROOT, 'src/content/blog'))) {
    if (!file.endsWith('.md')) continue;
    const fm = readFrontmatter(file);
    if (fm.draft === 'true') continue;
    const d = iso(fm.updated || fm.date);
    if (!d) continue;
    const slug = path.basename(file, '.md');
    map.set(`/blog/${slug}/`, d);
    postDates.push(d);
    for (const t of fm.tags ?? []) {
      const key = t.toLowerCase();
      tagDates.set(key, newest([tagDates.get(key), d]));
    }
  }

  // Oversigtssider er lige så friske som det nyeste de viser.
  const latest = newest(postDates);
  if (latest) {
    map.set('/blog/', latest);
    map.set('/tags/', latest);
    for (const [tag, d] of tagDates) map.set(`/tags/${tag}/`, d);
  }
  return map;
};

const lastmodByRoute = buildLastmodMap();

export default defineConfig({
  site: 'https://asger.xn--weirse-fya.dk',
  trailingSlash: 'ignore',
  integrations: [
    sitemap({
      changefreq: 'weekly',
      priority: 0.7,
      serialize(item) {
        const pathname = new URL(item.url).pathname;
        if (pathname === '/') item.priority = 1.0;
        const lastmod = lastmodByRoute.get(pathname);
        if (lastmod) item.lastmod = lastmod;
        return item;
      },
    }),
    // Service worker → offline support + installable PWA. autoUpdate + outdated-cache
    // cleanup so a redeploy never strands a visitor on a stale version. Reuses the
    // existing public/site.webmanifest (manifest: false = don't generate another).
    AstroPWA({
      registerType: 'autoUpdate',
      manifest: false,
      includeManifestIcons: false,
      workbox: {
        globPatterns: ['**/*.{html,css,js,svg,png,woff2,xml,txt,webmanifest}'],
        cleanupOutdatedCaches: true,
        clientsClaim: true,
        skipWaiting: true,
      },
      devOptions: { enabled: false },
    }),
  ],
  prefetch: { prefetchAll: true, defaultStrategy: 'viewport' },
  vite: { plugins: [tailwindcss()] },
});