fix issue #421

marshal.go

@@ -436,6 +436,7 @@ func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, er
 					if tree, ok := val.(*Tree); ok && mtypef.Anonymous && !opts.nameFromTag && !e.promoteAnon {
 						e.appendTree(tval, tree)
 					} else {
+						val = e.wrapTomlValue(val, tval)
 						tval.SetPathWithOptions([]string{opts.name}, SetOptions{
 							Comment:   opts.comment,
 							Commented: opts.commented,
@@ -474,6 +475,7 @@ func (e *Encoder) valueToTree(mtype reflect.Type, mval reflect.Value) (*Tree, er
 			if err != nil {
 				return nil, err
 			}
+			val = e.wrapTomlValue(val, tval)
 			if e.quoteMapKeys {
 				keyStr, err := tomlValueStringRepresentation(key.String(), "", "", e.order, e.arraysOneElementPerLine)
 				if err != nil {
@@ -516,7 +518,6 @@ func (e *Encoder) valueToOtherSlice(mtype reflect.Type, mval reflect.Value) (int
 
 // Convert given marshal value to toml value
 func (e *Encoder) valueToToml(mtype reflect.Type, mval reflect.Value) (interface{}, error) {
-	e.line++
 	if mtype.Kind() == reflect.Ptr {
 		switch {
 		case isCustomMarshaler(mtype):
@@ -579,6 +580,25 @@ func (e *Encoder) appendTree(t, o *Tree) error {
 	return nil
 }
 
+// Create a toml value with the current line number as the position line
+func (e *Encoder) wrapTomlValue(val interface{}, parent *Tree) interface{} {
+	_, isTree := val.(*Tree)
+	_, isTreeS := val.([]*Tree)
+	if isTree || isTreeS {
+		return val
+	}
+
+	ret := &tomlValue{
+		value: val,
+		position: Position{
+			e.line,
+			parent.position.Col,
+		},
+	}
+	e.line++
+	return ret
+}
+
 // Unmarshal attempts to unmarshal the Tree into a Go struct pointed by v.
 // Neither Unmarshaler interfaces nor UnmarshalTOML functions are supported for
 // sub-structs, and only definite types can be unmarshaled.

marshal_test.go

@@ -14,60 +14,69 @@ import (
 )
 
 type basicMarshalTestStruct struct {
-	String     string                      `toml:"Zstring"`
-	StringList []string                    `toml:"Ystrlist"`
-	Sub        basicMarshalTestSubStruct   `toml:"Xsubdoc"`
-	SubList    []basicMarshalTestSubStruct `toml:"Wsublist"`
+	String     string   `toml:"Zstring"`
+	StringList []string `toml:"Ystrlist"`
+	BasicMarshalTestSubAnonymousStruct
+	Sub     basicMarshalTestSubStruct   `toml:"Xsubdoc"`
+	SubList []basicMarshalTestSubStruct `toml:"Wsublist"`
 }
 
 type basicMarshalTestSubStruct struct {
 	String2 string
 }
 
-var basicTestData = basicMarshalTestStruct{
-	String:     "Hello",
-	StringList: []string{"Howdy", "Hey There"},
-	Sub:        basicMarshalTestSubStruct{"One"},
-	SubList:    []basicMarshalTestSubStruct{{"Two"}, {"Three"}},
+type BasicMarshalTestSubAnonymousStruct struct {
+	String3 string
 }
 
-var basicTestToml = []byte(`Ystrlist = ["Howdy", "Hey There"]
-Zstring = "Hello"
+var basicTestData = basicMarshalTestStruct{
+	String:                             "Hello",
+	StringList:                         []string{"Howdy", "Hey There"},
+	BasicMarshalTestSubAnonymousStruct: BasicMarshalTestSubAnonymousStruct{"One"},
+	Sub:                                basicMarshalTestSubStruct{"Two"},
+	SubList:                            []basicMarshalTestSubStruct{{"Three"}, {"Four"}},
+}
 
-[[Wsublist]]
-  String2 = "Two"
+var basicTestToml = []byte(`String3 = "One"
+Ystrlist = ["Howdy", "Hey There"]
+Zstring = "Hello"
 
 [[Wsublist]]
   String2 = "Three"
 
+[[Wsublist]]
+  String2 = "Four"
+
 [Xsubdoc]
-  String2 = "One"
+  String2 = "Two"
 `)
 
-var basicTestTomlCustomIndentation = []byte(`Ystrlist = ["Howdy", "Hey There"]
+var basicTestTomlCustomIndentation = []byte(`String3 = "One"
+Ystrlist = ["Howdy", "Hey There"]
 Zstring = "Hello"
 
-[[Wsublist]]
-	String2 = "Two"
-
 [[Wsublist]]
 	String2 = "Three"
 
+[[Wsublist]]
+	String2 = "Four"
+
 [Xsubdoc]
-	String2 = "One"
+	String2 = "Two"
 `)
 
 var basicTestTomlOrdered = []byte(`Zstring = "Hello"
 Ystrlist = ["Howdy", "Hey There"]
+String3 = "One"
 
 [Xsubdoc]
-  String2 = "One"
-
-[[Wsublist]]
   String2 = "Two"
 
 [[Wsublist]]
   String2 = "Three"
+
+[[Wsublist]]
+  String2 = "Four"
 `)
 
 var marshalTestToml = []byte(`title = "TOML Marshal Testing"

toml.go

@@ -315,6 +315,8 @@ func (t *Tree) SetPathWithOptions(keys []string, opts SetOptions, value interfac
 		toInsert = value
 	case *tomlValue:
 		v.comment = opts.Comment
+		v.commented = opts.Commented
+		v.multiline = opts.Multiline
 		toInsert = v
 	default:
 		toInsert = &tomlValue{value: value,