Bugfix/empty line at start parsing fixed

emitterc.go

@@ -1871,7 +1871,9 @@ func (emitter *yamlEmitter) writeDoubleQuotedScalar(value []byte, allow_breaks b
 }
 
 func (emitter *yamlEmitter) writeBlockScalarHints(value []byte) bool {
-	if isSpace(value, 0) || isLineBreak(value, 0) {
+	if isSpace(value, 0) {
+		// https://github.com/yaml/go-yaml/issues/65
+		// isLineBreak(value, 0) removed as the linebreak will only write the indention value.
 		indent_hint := []byte{'0' + byte(emitter.best_indent)}
 		if !emitter.writeIndicator(indent_hint, false, false, false) {
 			return false

encode_test.go

@@ -36,6 +36,7 @@ var marshalTests = []struct {
 	value any
 	data  string
 }{
+	// Basic types. First to validate handling newlines at the start.
 	{
 		nil,
 		"null\n",
@@ -136,6 +137,14 @@ var marshalTests = []struct {
 		map[string]any{"v": ""},
 		"v: \"\"\n",
 	},
+	{
+		map[string]any{"v": "\nhi"},
+		"v: |-\n\n    hi\n",
+	},
+	{
+		map[string][]any{"v": {map[string]any{"v1": "\nhi"}}},
+		"v:\n    - v1: |-\n\n        hi\n",
+	},
 	{
 		map[string][]string{"v": {"A", "B"}},
 		"v:\n    - A\n    - B\n",
@@ -930,6 +939,18 @@ a:
       - c: 1
         d: 2
 `),
+
+	normal(`
+v:
+    - v1: |-
+
+        hi
+`): compact(`
+v:
+  - v1: |-
+
+        hi
+`),
 }
 
 func TestEncoderCompactIndents(t *testing.T) {
@@ -966,7 +987,7 @@ func TestNewLinePreserved(t *testing.T) {
 	data, err = yaml.Marshal(obj)
 	assert.NoError(t, err)
 	// the newline at the start of the file should be preserved
-	assert.Equal(t, "_: |4\n\n    a:\n            b:\n                    c: d\n", string(data))
+	assert.Equal(t, "_: |\n\n    a:\n            b:\n                    c: d\n", string(data))
 }
 
 func TestScalarStyleRules(t *testing.T) {