Fix linking errors with multiple AppDelegate.m (#564)

In issue #477 there was an issue when the project has, for some reason, multiple AppDelegate.m files (eg project sample files) within the ios subdir of an RN project.

This fix will give priority to the AppDelegate.m found inside any path that has the application name (as defined in package.json) in it. If it cannot find that, it will revert to previous behavior (the first element in the path array).

Author: hilkeheremans

scripts/postlink/ios/postlink.js

@@ -3,9 +3,17 @@ var glob = require("glob");
 var inquirer = require('inquirer');
 var path = require("path");
 var plist = require("plist");
+var package = require('../../../../../package.json');
 
 var ignoreNodeModules = { ignore: "node_modules/**" };
-var appDelegatePath = glob.sync("**/AppDelegate.m", ignoreNodeModules)[0];
+var appDelegatePaths = glob.sync("**/AppDelegate.m", ignoreNodeModules);
+
+// Fix for https://github.com/Microsoft/react-native-code-push/issues/477
+// Typical location of AppDelegate.m for newer RN versions: $PROJECT_ROOT/ios/<project_name>/AppDelegate.m
+// Let's try to find that path by filtering the whole array for any path containing <project_name>
+// If we can't find it there, play dumb and pray it is the first path we find.
+var appDelegatePath = findFileByAppName(appDelegatePaths, package ? package.name : null) || appDelegatePaths[0];
+
 // Glob only allows foward slashes in patterns: https://www.npmjs.com/package/glob#windows
 var plistPath = glob.sync(path.join(path.dirname(appDelegatePath), "*Info.plist").replace(/\\/g, "/"), ignoreNodeModules)[0];
 
@@ -59,4 +67,19 @@ if (parsedInfoPlist.CodePushDeploymentKey) {
 function writePatches() {
     fs.writeFileSync(appDelegatePath, appDelegateContents);
     fs.writeFileSync(plistPath, plistContents);
-}
+}
+
+// Helper that filters an array with AppDelegate.m paths for a path with the app name inside it
+// Should cover nearly all cases
+function findFileByAppName(array, appName) {
+    if (array.length === 0 || !appName) return null;
+
+    for (var i = 0; i < array.length; i++) {
+        var path = array[i];
+        if (path && path.indexOf(appName) !== -1) {
+            return path;
+        }
+    }
+
+    return null;
+}