Add plausible

package-lock.json

@@ -10,6 +10,7 @@
       "license": "UNLICENSED",
       "devDependencies": {
         "@eslint/js": "^10.0.1",
+        "@plausible-analytics/tracker": "^0.4.5",
         "@playwright/test": "^1.60.0",
         "@types/node": "^25.9.1",
         "eslint": "^10.4.1",
@@ -1517,6 +1518,13 @@
         "url": "https://opencollective.com/parcel"
       }
     },
+    "node_modules/@plausible-analytics/tracker": {
+      "version": "0.4.5",
+      "resolved": "https://registry.npmjs.org/@plausible-analytics/tracker/-/tracker-0.4.5.tgz",
+      "integrity": "sha512-6BfAGejXY+YA3Cw6LYT2Zpn4hTxDtPQAawFsYUsQCOg78wIS5C4deAGXTfJffa5VleMWITv5lpJ/EYuQBl1tPA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@playwright/test": {
       "version": "1.60.0",
       "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.60.0.tgz",

package.json

@@ -47,6 +47,7 @@
     "typescript": "^6.0.3",
     "typescript-eslint": "^8.60.0",
     "vite": "^8.0.14",
-    "vitest": "^4.1.7"
+    "vitest": "^4.1.7",
+    "@plausible-analytics/tracker": "^0.4.5"
   }
 }

src/analytics.ts

@@ -0,0 +1,53 @@
+import {
+  init as plausibleInit,
+  track as plausibleTrack,
+  type PlausibleEventOptions,
+} from '@plausible-analytics/tracker';
+
+const ANALYTICS_AUTO_CAPTURE_PAGEVIEWS = true;
+const ANALYTICS_DOMAIN = 'schmelczer.dev/photos';
+const ANALYTICS_ENDPOINT = 'https://stats.schmelczer.dev/status';
+const ANALYTICS_LOGGING = import.meta.env.DEV;
+
+let isInitialized = false;
+
+const track = (eventName: string, options: PlausibleEventOptions = {}) => {
+  try {
+    plausibleTrack(eventName, options);
+  } catch (error) {
+    console.warn(`Could not track analytics event "${eventName}".`, error);
+  }
+};
+
+export const initAnalytics = () => {
+  if (isInitialized) {
+    return;
+  }
+
+  try {
+    plausibleInit({
+      domain: ANALYTICS_DOMAIN,
+      endpoint: ANALYTICS_ENDPOINT,
+      autoCapturePageviews: ANALYTICS_AUTO_CAPTURE_PAGEVIEWS,
+      logging: ANALYTICS_LOGGING,
+    });
+    isInitialized = true;
+  } catch (error) {
+    console.warn('Could not initialize analytics.', error);
+  }
+};
+
+export const trackPhotoView = ({
+  photoId,
+  source,
+}: {
+  photoId: string;
+  source: string;
+}) => {
+  track('Photo View', {
+    props: {
+      photoId,
+      source,
+    },
+  });
+};

src/index.ts

@@ -1,8 +1,11 @@
 import './index.scss';
+import { initAnalytics, trackPhotoView } from './analytics';
 import { PhotoGallery, requiredElement } from './photos';
 
 document.documentElement.classList.add('js');
 
+initAnalytics();
+
 const gallery = requiredElement<HTMLElement>('#gallery', HTMLElement);
 const frame = requiredElement<HTMLElement>('#frame-content', HTMLElement);
 const toggle = requiredElement<HTMLButtonElement>(
@@ -14,4 +17,5 @@ new PhotoGallery({
   gallery,
   frame,
   toggle,
+  onSelect: trackPhotoView,
 });

src/photos.ts

@@ -5,11 +5,13 @@ type GalleryOptions = {
   readonly frame: HTMLElement;
   readonly toggle: HTMLButtonElement;
   readonly autoAdvance?: boolean;
+  readonly onSelect?: (info: { photoId: string; source: string }) => void;
 };
 
 type SelectOptions = {
   readonly focusThumbnail?: boolean;
   readonly pause?: boolean;
+  readonly source?: string;
 };
 
 export const requiredElement = <T extends Element>(
@@ -118,7 +120,10 @@ export class PhotoGallery {
       }
 
       event.preventDefault();
-      this.selectById(thumbnail.dataset.photoId, { pause: true });
+      this.selectById(thumbnail.dataset.photoId, {
+        pause: true,
+        source: 'thumbnail',
+      });
     });
 
     this.options.gallery.addEventListener('keydown', (event) => {
@@ -128,6 +133,7 @@ export class PhotoGallery {
           this.select(this.selectedIndex - 1, {
             focusThumbnail: true,
             pause: true,
+            source: 'keyboard',
           });
           break;
         case 'ArrowRight':
@@ -135,17 +141,23 @@ export class PhotoGallery {
           this.select(this.selectedIndex + 1, {
             focusThumbnail: true,
             pause: true,
+            source: 'keyboard',
           });
           break;
         case 'Home':
           event.preventDefault();
-          this.select(0, { focusThumbnail: true, pause: true });
+          this.select(0, {
+            focusThumbnail: true,
+            pause: true,
+            source: 'keyboard',
+          });
           break;
         case 'End':
           event.preventDefault();
           this.select(this.thumbnails.length - 1, {
             focusThumbnail: true,
             pause: true,
+            source: 'keyboard',
           });
           break;
       }
@@ -202,6 +214,15 @@ export class PhotoGallery {
     if (options.pause) {
       this.pauseAutoAdvance();
     }
+
+    // Only user-initiated selections carry a source; auto-advance stays
+    // untracked so the slideshow doesn't flood analytics every few seconds.
+    if (options.source) {
+      this.options.onSelect?.({
+        photoId: thumbnail.dataset.photoId ?? '',
+        source: options.source,
+      });
+    }
   }
 
   private updateSelectedThumbnail(index: number, shouldFocus: boolean): void {