implement simple tab switch

src/background/index.js

@@ -1,4 +1,18 @@
+import * as tabs from './tabs';
+
+const KEY_MAP = {
+  'tabs.prev': 104,
+  'tabs.next': 108
+};
+
 browser.runtime.onMessage.addListener((request, sender, sendResponse) => {
-  console.log("Pressed " + request.which);
-  sendResponse({ response: "Response from background script" });
+  switch (request.key) {
+  case KEY_MAP['tabs.prev']:
+    tabs.selectPrevTab(sender.tab.index);
+    break;
+  case KEY_MAP['tabs.next']:
+    tabs.selectNextTab(sender.tab.index);
+    break;
+  }
+  sendResponse();
 });

src/background/tabs.js

@@ -0,0 +1,23 @@
+const selectPrevTab = (current) => {
+  chrome.tabs.query({ currentWindow: true }, (tabs) => {
+    if (tabs.length < 2) {
+      return;
+    }
+    let select = (current - 1) % tabs.length
+    let id = tabs[select].id;
+    chrome.tabs.update(id, { active: true })
+  });
+};
+
+const selectNextTab = (current) => {
+  chrome.tabs.query({ currentWindow: true }, (tabs) => {
+    if (tabs.length < 2) {
+      return;
+    }
+    let select = (current + 1 + tabs.length) % tabs.length
+    let id = tabs[select].id;
+    chrome.tabs.update(id, { active: true })
+  });
+};
+
+export { selectNextTab, selectPrevTab };

src/content/index.js

@@ -1,9 +1,12 @@
 window.addEventListener("keypress", (e) => {
   browser.runtime.sendMessage({
-    which: e.which || e.keyCode,
-  }).then((msg) => {
-    console.log(`Message from the background script:  ${msg.response}`);
+    key: e.which || e.keyCode,
+    shift: e.shift,
+    alt: e.alt,
+    meta: e.meta,
+    ctrl: e.ctrl,
+  }).then(() => {
   }, (err) => {
-    console.log(`Error: ${err}`);
+    console.log(`Vim Vixen: ${err}`);
   });
 });