Fix line endings for inserted maps on Windows

Fixes https://github.com/dart-lang/yaml_edit/issues/65

Author: DanTup

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 2.2.1
+- Fix inconsistent line endings when inserting maps into a document using `\r\n`.
+  ([#65](https://github.com/dart-lang/yaml_edit/issues/65))
+
 ## 2.2.0
 - `AliasError` is changed to `AliasException` and exposed in the public API.
 

lib/src/strings.dart

@@ -274,7 +274,7 @@ String yamlEncodeBlockString(
       /// Empty collections are always encoded in flow-style, so new-line must
       /// be avoided
       if (isCollection(entry.value) && !isEmpty(entry.value)) {
-        return '$formattedKey:\n$formattedValue';
+        return '$formattedKey:$lineEnding$formattedValue';
       }
 
       return '$formattedKey: $formattedValue';

pubspec.yaml

@@ -1,5 +1,5 @@
 name: yaml_edit
-version: 2.2.0
+version: 2.2.1
 description: A library for YAML manipulation with comment and whitespace preservation.
 repository: https://github.com/dart-lang/yaml_edit
 issue_tracker: https://github.com/dart-lang/yaml_edit/issues

test/windows_test.dart

@@ -167,6 +167,25 @@ c: 3\r
       expectYamlBuilderValue(doc, []);
     });
 
+    test('inserted nested map', () {
+      final doc = YamlEditor('''
+a:\r
+  b:\r
+''');
+      doc.update(
+        ['a', 'b'],
+        {
+          'c': {'d': 'e'}
+        },
+      );
+      expect(doc.toString(), equals('''
+a:\r
+  b:\r
+    c:\r
+      d: e\r
+'''));
+    });
+
     test('remove from block map', () {
       final doc = YamlEditor('''
 a: 1\r