feat: only update config and write plist file if they don't exist

packages/flutterfire_cli/lib/src/commands/config.dart

@@ -403,8 +403,9 @@ class ConfigCommand extends FlutterFireCommand {
 
       final file = File(googleServiceInfoFile);    
 
-      await file.writeAsString(iosOptions.optionsSourceContent);
-      //check exists here. write if not.
+      if (!file.existsSync()) {
+        await file.writeAsString(iosOptions.optionsSourceContent);  
+      }
 
       final pathToScript = path.split(Platform.script.toFilePath());
 
@@ -416,12 +417,8 @@ class ConfigCommand extends FlutterFireCommand {
 
       final xcodeProjFilePath = path.join(flutterApp!.iosDirectory.path, 'Runner.xcodeproj');
 
-
-      //TODO -check if google file already exists in project.pbxproj (update if not) & check if google file exists (update if not). 
       if (Platform.isMacOS) {
         final result = await Process.run('ruby', [ pathToPbxScript,'--googleFile=$googleServiceInfoFile','--xcodeFile=$xcodeProjFilePath']);
-        print('stdout: ${result.stdout}');
-        print('stderr: ${result.stderr}');
       }
     }
 

scripts/set_ios_pbxproj_file.rb

@@ -20,9 +20,18 @@
 project_path = options[:xcodeFile]
 # open the xcode project
 project = Xcodeproj::Project.open(project_path)
-# add GoogleService-Info.plist to your xcode project
-file = project.new_file(options[:googleFile])
-# save it
-project.save
 
-puts "Updated project.pbxproj file for Xcode project with GoogleService-Info.plist."
+# check id GoogleService-Info.plist config is part of xcode project
+googleConfigExists = false
+project.files.each do |file|
+  if file.path == "Runner/GoogleService-Info.plist"
+    googleConfigExists = true
+    exit
+  end
+end
+
+# Write only if config doesn't exist
+if googleConfigExists == false
+  project.new_file(options[:googleFile])
+  project.save
+end