Update notification - based on current platform (#14655)

* Update notification - based on current platform

* Fix lint error in Global.js

* Restructure validity check and remove duplicate function definition

Author: swmitra

src/extensions/default/AutoUpdate/main.js

@@ -329,27 +329,6 @@ define(function (require, exports, module) {
     }
 
 
-     /**
-     * Generates the extension for installer file, based on platform
-     * @returns {string} - OS - current OS }
-     */
-    function getPlatformInfo() {
-        var OS = "";
-
-        if (/Windows|Win32|WOW64|Win64/.test(window.navigator.userAgent)) {
-            OS = "WIN";
-        } else if (/Mac/.test(window.navigator.userAgent)) {
-            OS = "OSX";
-        } else if (/Linux|X11/.test(window.navigator.userAgent)) {
-            OS = "LINUX32";
-            if (/x86_64/.test(window.navigator.appVersion + window.navigator.userAgent)) {
-                OS = "LINUX64";
-            }
-        }
-
-        return OS;
-    }
-
     /**
      * Initializes the state for AutoUpdate process
      * @returns {$.Deferred} - a jquery promise,
@@ -466,7 +445,7 @@ define(function (require, exports, module) {
                 console.warn("AutoUpdate : updates information not available.");
                 return;
             }
-            var OS = getPlatformInfo(),
+            var OS = brackets.getPlatformInfo(),
                 checksum,
                 downloadURL,
                 installerName,

src/utils/Global.js

@@ -83,6 +83,24 @@ define(function (require, exports, module) {
         global.brackets.platform = "win";
     }
 
+    // Expose platform info for build applicability consumption
+    global.brackets.getPlatformInfo = function () {
+        var OS = "";
+
+        if (/Windows|Win32|WOW64|Win64/.test(window.navigator.userAgent)) {
+            OS = "WIN";
+        } else if (/Mac/.test(window.navigator.userAgent)) {
+            OS = "OSX";
+        } else if (/Linux|X11/.test(window.navigator.userAgent)) {
+            OS = "LINUX32";
+            if (/x86_64/.test(window.navigator.appVersion + window.navigator.userAgent)) {
+                OS = "LINUX64";
+            }
+        }
+
+        return OS;
+    };
+
     global.brackets.inBrowser = !global.brackets.hasOwnProperty("fs");
 
     // Are we in a desktop shell with a native menu bar?

src/utils/UpdateNotification.js

@@ -261,6 +261,13 @@ define(function (require, exports, module) {
         return result.promise();
     }
 
+    /**
+     * Checks whether a build is applicable to the current platform.
+     */
+    function _checkBuildApplicability(buildInfo) {
+        return !buildInfo.platforms || buildInfo.platforms[brackets.getPlatformInfo()];
+    }
+
     /**
      * Return a new array of version information that is newer than "buildNumber".
      * Returns null if there is no new version information.
@@ -270,20 +277,23 @@ define(function (require, exports, module) {
         // should get through the search quickly.
         var lastIndex = 0;
         var len = versionInfo.length;
+        var versionEntry;
+        var validBuildEntries;
 
         while (lastIndex < len) {
-            if (versionInfo[lastIndex].buildNumber <= buildNumber) {
+            versionEntry = versionInfo[lastIndex];
+            if (versionEntry.buildNumber <= buildNumber) {
                 break;
             }
             lastIndex++;
         }
 
         if (lastIndex > 0) {
-            return versionInfo.slice(0, lastIndex);
+            // Filter recent update entries based on applicability to current platform
+            validBuildEntries = versionInfo.slice(0, lastIndex).filter(_checkBuildApplicability);
         }
 
-        // No new version info
-        return null;
+        return validBuildEntries;
     }
 
     /**
@@ -446,7 +456,7 @@ define(function (require, exports, module) {
                     return;
                 }
 
-                if (allUpdates) {
+                if (allUpdates && allUpdates.length > 0) {
                     // Always show the "update available" icon if any updates are available
                     var $updateNotification = $("#update-notification");