DEV: automatic timezone detection + manual override support

about.json

@@ -1,13 +1,15 @@
 {
-  "name": "TODO",
+  "name": "Discourse Automatic Timezone",
   "component": true,
-  "authors": "Discourse",
-  "about_url": "TODO: Put your theme's public repo or Meta topic URL here",
-  "license_url": "TODO: Put your theme's LICENSE URL here",
-  "learn_more": "TODO",
+  "authors": "Chapoi",
+  "about_url": "",
+  "license_url": "",
+  "learn_more": "",
   "theme_version": "0.0.1",
   "minimum_discourse_version": null,
   "maximum_discourse_version": null,
-  "assets": {},
+  "assets": {
+    "user_custom_fields": ["manually_set_timezone", "last_detected_timezone"]
+  },
   "modifiers": {}
 }

javascripts/discourse/api-initializers/automatic-timezone.js

@@ -0,0 +1,29 @@
+import { apiInitializer } from "discourse/lib/api";
+
+export default apiInitializer("1.14.0", (api) => {
+  const currentUser = api.getCurrentUser();
+  if (!currentUser) {
+    return;
+  }
+
+  const browserTimezone = moment.tz.guess();
+  const lastDetectedTimezone = currentUser.timezone;
+  const wasManuallySet =
+    currentUser.custom_fields?.manually_set_timezone === "true";
+
+  if (!wasManuallySet || browserTimezone !== lastDetectedTimezone) {
+    currentUser.set("timezone", browserTimezone);
+    currentUser.set("custom_fields.manually_set_timezone", "false");
+    try {
+      currentUser.save();
+    } catch {
+      currentUser.set("timezone", lastDetectedTimezone);
+    }
+  }
+
+  api.registerUserProfileBeforeSaveCallback((userModel) => {
+    if (userModel.timezone !== browserTimezone) {
+      userModel.set("custom_fields.manually_set_timezone", "true");
+    }
+  });
+});

locales/en.yml

@@ -1,5 +1,3 @@
 en:
   theme_metadata:
-    description: "TODO"
-    settings:
-      example_setting: "A description of a setting."
+    description: "Automatically sets the user's timezone based on the current browser timezone"