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background.js

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+/**
+ * Randomly shuffle an array
+ * https://stackoverflow.com/a/2450976/1293256
+ * @param  {Array} array The array to shuffle
+ * @return {String}      The first item in the shuffled array
+ */
+var shuffle = function (array) {
+
+	var currentIndex = array.length;
+	var temporaryValue, randomIndex;
+
+	// While there remain elements to shuffle...
+	while (0 !== currentIndex) {
+		// Pick a remaining element...
+		randomIndex = Math.floor(Math.random() * currentIndex);
+		currentIndex -= 1;
+
+		// And swap it with the current element.
+		temporaryValue = array[currentIndex];
+		array[currentIndex] = array[randomIndex];
+		array[randomIndex] = temporaryValue;
+	}
+
+	return array;
+
+};
+
+chrome.browserAction.onClicked.addListener(function() {
+  chrome.tabs.query({}, function(tabs) {
+    chrome.browserAction.getBadgeText({}, function(text) {
+      ok = confirm("Are you sure you want to snap " + text + " tabs?")
+      if (ok) {
+        shuffle(tabs)
+        let count = Math.floor(tabs.length / 2) + 1
+        tabs = tabs.slice(1, count)
+        let ids = [];
+        for (tab in tabs) {
+          ids.push(tabs[tab].id)
+        }
+        chrome.tabs.remove(ids)
+      }
+    })
+  })
+})
+
+function updateCount() {
+  chrome.tabs.query({}, function(tabs) {
+    chrome.browserAction.setBadgeText({ text: "" + Math.floor(tabs.length / 2) })
+  })
+}
+
+chrome.tabs.onCreated.addListener(function() {
+  updateCount()
+})
+chrome.tabs.onRemoved.addListener(function() {
+  updateCount()
+})
+chrome.windows.onCreated.addListener(function() {
+  updateCount()
+})
+chrome.windows.onRemoved.addListener(function() {
+  updateCount()
+})
+
+updateCount()

manifest.json

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+{
+  "manifest_version": 2,
+  "name": "The Snap",
+  "description": "Too many tabs open? Halve your workload.",
+  "version": "1.0",
+  "icons": {
+    "16": "images/gauntlet16.png",
+    "32": "images/gauntlet32.png",
+    "48": "images/gauntlet48.png",
+    "128": "images/gauntlet128.png"
+  },
+  "browser_action": {},
+  "permissions": [ "tabs" ],
+  "background": {
+    "scripts": [ "background.js" ],
+    "persistent": false
+  }
+}