functionOrNull

Author: danylo-safonov-solid

tools/add_imports/bin/add_imports.dart

@@ -2,17 +2,27 @@ import 'dart:io';
 
 import 'package:add_imports/src/args.dart';
 import 'package:add_imports/src/config.dart';
+import 'package:add_imports/src/util.dart';
 import 'package:collection/collection.dart';
 
 void main(List<String> arguments) {
-  final args = Args.tryParse(arguments);
+  final args = (() => Args.parse(arguments)).orNull();
   if (args == null) {
     print(Args.usage);
 
     return;
   }
 
-  final config = Config.fromYaml(File(args.configpath).readAsStringSync());
+  final config = (() => Config.fromYaml(
+        File(args.configpath).readAsStringSync(),
+      )).orNull();
+
+  if (config == null) {
+    print('Error while reading config from "${args.configpath}"');
+
+    return;
+  }
+
   final sourceFile = File(args.filename);
   final sourceString = sourceFile.readAsStringSync();
 

tools/add_imports/lib/src/args.dart

@@ -15,18 +15,9 @@ class Args {
   factory Args.parse(List<String> arguments) {
     final result = parser.parse(arguments);
 
-
     return Args(
       filename: result['filename'] as String,
       configpath: result['configpath'] as String,
     );
   }
-
-  static Args? tryParse(List<String> arguments) {
-    try {
-      return Args.parse(arguments);
-    } catch (_) {
-      return null;
-    }
-  }
 }

tools/add_imports/lib/src/config.dart

@@ -21,12 +21,4 @@ class Config {
       fileUrlPrefix: parsedYaml['file_url_prefix'] as String,
     );
   }
-
-  static Config? tryFromYaml(String yamlString) {
-    try {
-      return Config.fromYaml(yamlString);
-    } catch (_) {
-      return null;
-    }
-  }
 }

tools/add_imports/lib/src/function_or_null.dart

@@ -0,0 +1,9 @@
+extension FunctionOrNull<T> on T Function() {
+  T? orNull() {
+    try {
+      return this();
+    } catch (_) {
+      return null;
+    }
+  }
+}