From 3eefa5d6443d65568099dd90fb162c796f9eeba7 Mon Sep 17 00:00:00 2001
From: Ali Orhun Akkirman <aoakkirman@gmail.com>
Date: Sun, 27 Sep 2026 17:46:12 +0300
Subject: [PATCH] Add installable PWA support

---
 README.md                   |  12 ++++++++
 index.html                  |   6 ++++
 public/icons/icon-192.png   | Bin 0 -> 1500 bytes
 public/icons/icon-512.png   | Bin 0 -> 4335 bytes
 public/manifest.webmanifest |  25 +++++++++++++++++
 scripts/build.mjs           |  51 ++++++++++++++++++++++++++++++++--
 scripts/verify-offline.mjs  |  47 ++++++++++++++++++++++++++++----
 src/app.js                  |  20 +++++++++++++-
 src/sw.js                   |  53 ++++++++++++++++++++++++++++++++++++
 9 files changed, 205 insertions(+), 9 deletions(-)
 create mode 100644 public/icons/icon-192.png
 create mode 100644 public/icons/icon-512.png
 create mode 100644 public/manifest.webmanifest
 create mode 100644 src/sw.js

diff --git a/README.md b/README.md
index 9e998c0..bcb0ca4 100644
--- a/README.md
+++ b/README.md
@@ -140,6 +140,18 @@ Bu kontrol, build çıktısında uzak script/style/module bağlantısı kalmadı
 
 ---
 
+## PWA ve çevrimdışı kullanım
+
+GitHub Pages sürümü installable PWA olarak yayınlanır. Manifest, uygulama ikonları ve service worker build sırasında `dist/` içine dahil edilir.
+
+- `start_url` ve `scope` relative (`./`) tutulduğu için proje `/mathnote/` gibi GitHub Pages alt yollarında çalışır.
+- İlk başarılı ziyarette uygulama shell'i, JavaScript/CSS, KaTeX fontları, manifest ve ikonlar precache edilir.
+- Yeni build'de dosya içeriğinden yeni bir cache sürümü üretilir; service worker aktive olduğunda eski MathNote cache'leri temizlenir.
+- Service worker yalnızca HTTP/HTTPS üzerinde kaydolur. Bu nedenle `dist/index.html` dosyasını doğrudan `file://` ile açma desteği korunur.
+- Destekleyen tarayıcılar MathNote'u masaüstüne veya ana ekrana bağımsız uygulama olarak kurabilir.
+
+---
+
 ## GitHub Pages
 
 Repo, GitHub Pages üzerinde kaynak `index.html` dosyasını doğrudan yayınlamak yerine GitHub Actions ile build edilir. `.github/workflows/pages.yml` workflow'u:
diff --git a/index.html b/index.html
index 42ef209..bdfcb8b 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,12 @@
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Math Notebook</title>
+<meta name="theme-color" content="#1971c2">
+<meta name="application-name" content="MathNote">
+<meta name="apple-mobile-web-app-capable" content="yes">
+<meta name="apple-mobile-web-app-status-bar-style" content="default">
+<link rel="manifest" href="./manifest.webmanifest">
+<link rel="apple-touch-icon" href="./icons/icon-192.png">
 <link rel="icon" type="image/png" 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jj/+OHlv3Ua8jtoieZjhyafbeGUwNwa2EO8RVn6wSbKyD+LbImxOdHAbt9y3PaTjn/ZCFyVrkasW49uiusfVlGaNj0cgqtg4eaY7rzT6qpu2Gf3GyhL/WcCAlMBpJjlemb/14WZ5C+NdDh2UJQsnysWDesjiF9bIgsdexwtJtEzbZnLl0J5OgOZsiSQMndGXdpECzB2u5U2bxpBWWWEDUVYqPtyIbeFyWOOb2JEEfoNAWxw38zBkWiA0zIVQqZSd79lKYYA+EXI5Q4AennaTDBvUXfhxRc8uZ1U4CabAaF6/RKrSeauElptkfbBH+WxcjYNzEZ0ybidINjA5CUqIinIBpWu54ea54O97nG30kCvoYgFIC+XBw3knltbVyuNxuGPPjTO62llm4w4+v9Me4BvOru/X/bKNigP9FCPNyMJ416XURZVWmaBq5EHEAP0U+ZUFx2kgjWtflv0X6bEYYoPkswRANdTVqmMwJ7MbJs6RdR9vxqMqhhSf2mCZhsLuL/AWRG4eM0RGDO/zM4Lg2etaLD4CqPOZ0TsUdRRqjvMr7BEUhMuJZivxre1hHGPxtXRVrUb8ho3fyOKX3pc7cHZQKz3NdDanjvJBg/NwyTir9c9wnqY7X+LLzh3rBYZ07OMwDXAR0xBYh7GcpfCrC1yJ/GIUadHilTLxnqckF9vcQX07yiP/uEHS0/GtQSXpsSVv4RPW1jJ+9EWVUBlUdXpUlULKIaD1rhGJNk8oCiKYrYDM+Ei8CM7Zh1/QUb5cca/8a81D0qdHhrbO+d06yLz7bsT6lCTPPPe2PLH07ZghQVa2usu5ZX75jY/kj8N6K4y3XJwoubRvf66+DKHjlTlPmRVdlMXnjwT9bsn5Y31yimJy3QeQ0PeYFKyH8Fo1U6UeHj6iUF4DvYAGElYfMK4G/EB5m3uvR3YkGsm3Owk4S2BahY0UJfbrZT6w+PsDT8vCJ9+QBbPHy8ZNW2TWQ8vkkVnjpGfXDhUGgPxf7zgqe3KLzbdZqPvBSkJjZO/5UbL2I7DcmakLcb6hysWQKLsKoKRVgAiNC0YER2Lzl70nL63CBwr5R2TB9JukX+9OMnLcdHlx5XrwRCTluFQZ2KcjmTXRqGewUZo2/TmZMuFqGYyXqgvxDpBvk4/DBxbE9+jcTg7gRPmaGx+QM/BB87LF/yXNK3mWQDwlK6dY3vryMPihhg80ai8zbLqSasiBnB9l7owHZffeXAzX5ABvzSqTMUY6B9CgME4q3RBTKxKPxfbk5uOjmkM4GT+qrTrjv6+XU1s1kez9h+SyIT2kS6cz1DG2fD6+I1ix6mOpjyfEaXOX4RitpXz4z0yZ/PilRh5oOoP+EI7ZZ8x7UVYtnYqPmBsrzm9RBQQ3HHgW0bZSzEMWqDFAPTEJzmfLvJnTZPt3O0TSzAObRkDdCb0jpwmgkRE7CVq5ZUMHARquBHQ9Lh4iJzdpIHdP/lPIoVIpHJ+po9csfniC7MHL0Ix+N8sNf31IP3TIaH+q0vOrkiy8GZo641lJwZebP2Ttk+937ZFO55wmycHXqoHomIKq8dqILb9//x6ZO/0++Y7Op6YHcw8KnisMAhm9hI1Q1OyQYiPkkZgi0GxZDg/rpzpKZ90Vz0M4j8yGDewqK5a8LVfiiw+dL0B4210LpOfAW+VPl/WVG/44QIaPuAu/T3gbMTbBjZfl6sYC4wZ3t2z5nP175eEZ98P5nWj5dNNQymCprd1GhpPAmgkGP/rQInOTvPDSWxXgyF0gHG3V+eir+unX2RcN6KLEDMyfrxkkVw/ro0PjMIbBAEyM57Q/JeadQcWSYRP+E7Xl98rcmXB+K7u9a3nrSeiQEUW3NKHJgTPVYBWgUFwx0SJ1KIUlMnHcVjfR2eZNG8kLi25XFtaZWnnjvSZOm8/DGyUmh9dKuTfDn4jZni0/dya7/U6JsOWd7bbB1B/KcHV1wPCraMLxkMffkLhweCqd48R5TFjuXnvnM8vvaDy2cop0yl0O7dddmXlViRQJttvPmTFNx3wkFZ/tOeedgBhRruJyG2joi+J5OFpaiLe2Lkq2Yzg5Qe54Mbm9hKXviedWKYrzwv/VRYWpeIu0f1+WzJk+TbZxzGPCC2131sJYv21oe3nBBSy1Bna2HTueIeu/2S2l2LBESKjMygVOVkJp/HVYIX6ANfJvc2Ud3vIO7vtbqVMbLQA+ciilBpM1JJuFRgZUBh/cK4IHBCpiV/YRdPtHZcf2XWXHPElpQBlnnS2KDARys9i+TVOJLHl5bd6lf56eyh9LmI6gbgSEQYFICqezeEeIn5ZBIaZid9TlFBshhk0PIigPVwViA/lhCA1I9RnW0CkIScDhCk6hKJA/0DJOWynUof5apxXsKyac9pdKbTy3zPzb5ZMSu/22jZx4Yl3dPWGHU7GhTiYNw8ZI0u1mwwbF6PKVURcCZBCQ63AQpAeVVqDCiTPGhXHw6D0Zbjk2cu3dYzcQB4ih0oq2E47o2rU6SYYP7SrRhg1qp4wYjCUKOzw1wbVkwEthuJjpjTtp/GE4mAtDh8OHVwAjjjAEChfzEE848AGPV8fwUlryBhdghFO2tjhbXY0JLNSCD2I5CCyxNrhKiBvOHK67rJdgCkijtKNjR14ozZo1NGd+jsjPKdA2WACOqfvaAwoUTLAUEkMPcX6dZb+ugfbleGW/xxEcw2fpyshzdEDg53Odzj0VGzQ0ejQxPwp5JQ0b1JX5d18nackYX/zVZUzEwBRjrVXCLEa5ht0iKwqIx0t25TcTaIwon6x6oowtngkqVRWghFz/cIR/Qr1aMu/uUXh44gNFtCTYe/bu3kEW3Tda0pOwNcCHkSb5ztNEd1n0MWew0HZNs3xaAc5QrTodzJFsxt5UZQpoUdB/3gjEhZZvUCdNlswZJ+3atghEBQFglC5Ft1i+aIK0O6WxlOJtDr8SD1+sGGEUF1plhQeB0bhbvMFp5J0RxirFG7ghDV0z/EYHcJ7cSssx8sGNunnihzyMd7ydlc7ntJY3n56ij+H+pou/HS5GawSBoNp89IAFi1fJwmXvyqYtP0g+X4xy4qJJah3303FmB1YDHqIoztiOjCwBmRGkaGUgT4AksUXF01kwM2XBTUmtXYSrgzjtSMXhTfvWTTDh9cazx/mm85EgTFMiOLVZiLr5Sski8FSGABYl5xzIz3/tzU/kueXr5L31X0tOLtZ+Z6XzRq2Adneqi9lak8NbmQbmVWIcI1wFGQJOQ9ypOBDWbX2NQ6yTb9wGoGzU6tVNk95d28nF/TpJfxzCpKYlpkhptABiA2L4SEOf/V+9+2xV0nxBgQAAAABJRU5ErkJggg==">
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">
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new file mode 100644
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diff --git a/public/icons/icon-512.png b/public/icons/icon-512.png
new file mode 100644
index 0000000000000000000000000000000000000000..64001182ea66f9aef2e55c2b11504681e7cad6a7
GIT binary patch
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BTA2U<

literal 0
HcmV?d00001

diff --git a/public/manifest.webmanifest b/public/manifest.webmanifest
new file mode 100644
index 0000000..1eed752
--- /dev/null
+++ b/public/manifest.webmanifest
@@ -0,0 +1,25 @@
+{
+  "name": "MathNote – Interactive Mathematics Notebook",
+  "short_name": "MathNote",
+  "description": "Offline-capable interactive mathematics notebook",
+  "start_url": "./",
+  "scope": "./",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#1971c2",
+  "orientation": "any",
+  "icons": [
+    {
+      "src": "./icons/icon-192.png",
+      "sizes": "192x192",
+      "type": "image/png",
+      "purpose": "any"
+    },
+    {
+      "src": "./icons/icon-512.png",
+      "sizes": "512x512",
+      "type": "image/png",
+      "purpose": "any maskable"
+    }
+  ]
+}
diff --git a/scripts/build.mjs b/scripts/build.mjs
index e1e0c94..be525e4 100644
--- a/scripts/build.mjs
+++ b/scripts/build.mjs
@@ -1,8 +1,12 @@
 import { build } from 'esbuild';
-import { mkdir, readFile, rm, writeFile } from 'node:fs/promises';
+import { createHash } from 'node:crypto';
+import { cp, mkdir, readFile, readdir, rm, writeFile } from 'node:fs/promises';
+import { relative } from 'node:path';
 
 const outdir = new URL('../dist/', import.meta.url);
 const templateUrl = new URL('../index.html', import.meta.url);
+const publicDir = new URL('../public/', import.meta.url);
+const serviceWorkerTemplateUrl = new URL('../src/sw.js', import.meta.url);
 
 await rm(outdir, { recursive: true, force: true });
 await mkdir(outdir, { recursive: true });
@@ -25,6 +29,8 @@ await build({
   }
 });
 
+await cp(publicDir, outdir, { recursive: true });
+
 let html = await readFile(templateUrl, 'utf8');
 html = html.replace(
   '<!-- MATHNOTE_BUILD_CSS -->',
@@ -32,7 +38,7 @@ html = html.replace(
 );
 html = html.replace(
   '<!-- MATHNOTE_BUILD_JS -->',
-  '<script defer src="./app.js"><\/script>'
+  '<script defer src="./app.js"><\\/script>'
 );
 
 if (html.includes('MATHNOTE_BUILD_')) {
@@ -41,4 +47,43 @@ if (html.includes('MATHNOTE_BUILD_')) {
 
 await writeFile(new URL('../dist/index.html', import.meta.url), html, 'utf8');
 await writeFile(new URL('../dist/.nojekyll', import.meta.url), '', 'utf8');
-console.log('MathNote offline bundle written to dist/.');
+
+async function collectFiles(dirUrl, rootUrl = dirUrl) {
+  const entries = await readdir(dirUrl, { withFileTypes: true });
+  const files = [];
+
+  for (const entry of entries) {
+    const childUrl = new URL(entry.name + (entry.isDirectory() ? '/' : ''), dirUrl);
+    if (entry.isDirectory()) {
+      files.push(...await collectFiles(childUrl, rootUrl));
+      continue;
+    }
+
+    if (entry.name === 'sw.js' || entry.name === '.nojekyll') continue;
+
+    files.push({
+      url: childUrl,
+      path: './' + relative(rootUrl.pathname, childUrl.pathname).replaceAll('\\\\', '/')
+    });
+  }
+
+  return files;
+}
+
+const precacheFiles = (await collectFiles(outdir)).sort((a, b) => a.path.localeCompare(b.path));
+const hash = createHash('sha256');
+
+for (const file of precacheFiles) {
+  hash.update(file.path);
+  hash.update(await readFile(file.url));
+}
+
+const cacheName = 'mathnote-' + hash.digest('hex').slice(0, 12);
+let serviceWorker = await readFile(serviceWorkerTemplateUrl, 'utf8');
+serviceWorker = serviceWorker
+  .replace('__CACHE_NAME__', cacheName)
+  .replace('__PRECACHE_ASSETS__', JSON.stringify(precacheFiles.map(file => file.path), null, 2));
+
+await writeFile(new URL('../dist/sw.js', import.meta.url), serviceWorker, 'utf8');
+
+console.log(`MathNote offline/PWA bundle written to dist/ using cache ${cacheName}.`);
diff --git a/scripts/verify-offline.mjs b/scripts/verify-offline.mjs
index 099e85e..97d3e4e 100644
--- a/scripts/verify-offline.mjs
+++ b/scripts/verify-offline.mjs
@@ -1,14 +1,22 @@
 import { readdir, readFile } from 'node:fs/promises';
-import { extname, join } from 'node:path';
+import { extname } from 'node:path';
 
 const root = new URL('../dist/', import.meta.url);
-const required = ['index.html', 'app.js', 'app.css'];
+const required = [
+  'index.html',
+  'app.js',
+  'app.css',
+  'manifest.webmanifest',
+  'sw.js',
+  'icons/icon-192.png',
+  'icons/icon-512.png'
+];
 
 for (const name of required) {
   await readFile(new URL(name, root));
 }
 
-const textExtensions = new Set(['.html', '.js', '.css', '.json', '.svg', '.txt']);
+const textExtensions = new Set(['.html', '.js', '.css', '.json', '.webmanifest', '.svg', '.txt']);
 const violations = [];
 let fontCount = 0;
 
@@ -48,14 +56,43 @@ for (const forbidden of ['cdn.jsdelivr.net', 'esm.sh', 'type="module"', 'type="i
   if (html.includes(forbidden)) violations.push(`index.html: contains ${forbidden}`);
 }
 
+if (!html.includes('rel="manifest" href="./manifest.webmanifest"')) {
+  violations.push('index.html: manifest link missing or not relative');
+}
+
+const app = await readFile(new URL('app.js', root), 'utf8');
+if (!app.includes("register('./sw.js'") && !app.includes('register("./sw.js"')) {
+  violations.push('app.js: relative service worker registration missing');
+}
+
+const manifest = JSON.parse(await readFile(new URL('manifest.webmanifest', root), 'utf8'));
+if (manifest.start_url !== './') violations.push('manifest: start_url must be ./');
+if (manifest.scope !== './') violations.push('manifest: scope must be ./');
+if (manifest.display !== 'standalone') violations.push('manifest: display must be standalone');
+
+const iconSizes = new Set((manifest.icons || []).map(icon => icon.sizes));
+if (!iconSizes.has('192x192')) violations.push('manifest: 192x192 icon missing');
+if (!iconSizes.has('512x512')) violations.push('manifest: 512x512 icon missing');
+
+const sw = await readFile(new URL('sw.js', root), 'utf8');
+if (sw.includes('__CACHE_NAME__') || sw.includes('__PRECACHE_ASSETS__')) {
+  violations.push('sw.js: build placeholders were not replaced');
+}
+if (!/mathnote-[a-f0-9]{12}/.test(sw)) {
+  violations.push('sw.js: content-derived cache version missing');
+}
+for (const asset of ['./index.html', './app.js', './app.css', './manifest.webmanifest', './icons/icon-192.png', './icons/icon-512.png']) {
+  if (!sw.includes(asset)) violations.push(`sw.js: precache entry missing for ${asset}`);
+}
+
 if (fontCount === 0) {
   violations.push('KaTeX fonts were not emitted into dist/.');
 }
 
 if (violations.length) {
-  console.error('Offline verification failed:');
+  console.error('Offline/PWA verification failed:');
   for (const item of violations) console.error(`- ${item}`);
   process.exit(1);
 }
 
-console.log(`Offline verification passed. ${fontCount} local font asset(s) found and no remote runtime dependency detected.`);
+console.log(`Offline/PWA verification passed. ${fontCount} local font asset(s), install manifest and versioned service worker verified.`);
diff --git a/src/app.js b/src/app.js
index 4583113..d2d43a7 100644
--- a/src/app.js
+++ b/src/app.js
@@ -4598,4 +4598,22 @@ document.getElementById('insert-modal').addEventListener('click', e => {
 // ================================================================
 
 renderTabs();
-initEditor(files[activeIdx].content);
\ No newline at end of file
+initEditor(files[activeIdx].content);
+
+// ================================================================
+// PWA / SERVICE WORKER
+// ================================================================
+
+function registerServiceWorker() {
+  if (!('serviceWorker' in navigator)) return;
+  if (!['http:', 'https:'].includes(window.location.protocol)) return;
+
+  window.addEventListener('load', () => {
+    navigator.serviceWorker
+      .register('./sw.js', { scope: './' })
+      .then(registration => registration.update().catch(() => {}))
+      .catch(error => console.warn('MathNote service worker registration failed:', error));
+  });
+}
+
+registerServiceWorker();
diff --git a/src/sw.js b/src/sw.js
new file mode 100644
index 0000000..f3e3a55
--- /dev/null
+++ b/src/sw.js
@@ -0,0 +1,53 @@
+const CACHE_PREFIX = 'mathnote-';
+const CACHE_NAME = '__CACHE_NAME__';
+const PRECACHE_ASSETS = __PRECACHE_ASSETS__;
+const APP_SHELL = new URL('./index.html', self.registration.scope).toString();
+
+const scopedUrl = path => new URL(path, self.registration.scope).toString();
+
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches
+      .open(CACHE_NAME)
+      .then(cache => cache.addAll(PRECACHE_ASSETS.map(scopedUrl)))
+      .then(() => self.skipWaiting())
+  );
+});
+
+self.addEventListener('activate', event => {
+  event.waitUntil(
+    caches
+      .keys()
+      .then(keys =>
+        Promise.all(
+          keys
+            .filter(key => key.startsWith(CACHE_PREFIX) && key !== CACHE_NAME)
+            .map(key => caches.delete(key))
+        )
+      )
+      .then(() => self.clients.claim())
+  );
+});
+
+self.addEventListener('fetch', event => {
+  const request = event.request;
+  if (request.method !== 'GET') return;
+
+  const url = new URL(request.url);
+  if (url.origin !== self.location.origin) return;
+
+  if (request.mode === 'navigate') {
+    event.respondWith(
+      fetch(request)
+        .then(response => response)
+        .catch(() => caches.match(APP_SHELL))
+    );
+    return;
+  }
+
+  event.respondWith(
+    caches
+      .match(request, { ignoreSearch: true })
+      .then(cached => cached || fetch(request))
+  );
+});