3 files changed, 58 insertions, 0 deletions
diff --git a/src/shared/versions/index.js b/src/shared/versions/index.js
new file mode 100644
index 0000000..ee9f3b5
--- /dev/null
+++ b/src/shared/versions/index.js
@@ -0,0 +1,39 @@
+import * as storage from './storage';
+import * as releaseNotes from './release-notes';
+import manifest from '../../../manifest.json';
+
+const NOTIFICATION_ID = 'vimvixen-update';
+
+const notificationClickListener = (id) => {
+  if (id !== NOTIFICATION_ID) {
+    return;
+  }
+
+  browser.tabs.create({ url: releaseNotes.url(manifest.version) });
+  browser.notifications.onClicked.removeListener(notificationClickListener);
+};
+
+const checkUpdated = () => {
+  return storage.load().then((prev) => {
+    if (!prev) {
+      return true;
+    }
+    return manifest.version !== prev;
+  });
+};
+
+const notify = () => {
+  browser.notifications.onClicked.addListener(notificationClickListener);
+  return browser.notifications.create(NOTIFICATION_ID, {
+    'type': 'basic',
+    'iconUrl': browser.extension.getURL('resources/icon_48x48.png'),
+    'title': 'Vim Vixen ' + manifest.version + ' has been installed',
+    'message': 'Click here to see release notes',
+  });
+};
+
+const commit = () => {
+  storage.save(manifest.version);
+};
+
+export { checkUpdated, notify, commit };
diff --git a/src/shared/versions/release-notes.js b/src/shared/versions/release-notes.js
new file mode 100644
index 0000000..6ef2335
--- /dev/null
+++ b/src/shared/versions/release-notes.js
@@ -0,0 +1,8 @@
+const url = (version) => {
+  if (version) {
+    return 'https://github.com/ueokande/vim-vixen/releases/tag/' + version;
+  }
+  return 'https://github.com/ueokande/vim-vixen/releases/';
+};
+
+export { url };
diff --git a/src/shared/versions/storage.js b/src/shared/versions/storage.js
new file mode 100644
index 0000000..37603c8
--- /dev/null
+++ b/src/shared/versions/storage.js
@@ -0,0 +1,11 @@
+const load = () => {
+  return browser.storage.local.get('version').then(({ version }) => {
+    return version;
+  });
+};
+
+const save = (version) => {
+  return browser.storage.local.set({ version });
+};
+
+export { load, save };