file: customize output delimiter (#226)

* customization output delimiter

* rename KeyValueDelimitersOutput to KeyValueDelimiterOnWrite

* add test for writing with KeyValueDelimiterOnWrite

* bugfix: use '=' as the default delimiter on write

Co-authored-by: Chaliy Roman <cerebrum.ch@gmail.com>

file.go

@@ -48,6 +48,9 @@ func newFile(dataSources []dataSource, opts LoadOptions) *File {
 	if len(opts.KeyValueDelimiters) == 0 {
 		opts.KeyValueDelimiters = "=:"
 	}
+	if len(opts.KeyValueDelimiterOnWrite) == 0 {
+		opts.KeyValueDelimiterOnWrite = "="
+	}
 	return &File{
 		BlockMode:   true,
 		dataSources: dataSources,
@@ -230,10 +233,10 @@ func (f *File) Append(source interface{}, others ...interface{}) error {
 }
 
 func (f *File) writeToBuffer(indent string) (*bytes.Buffer, error) {
-	equalSign := DefaultFormatLeft + "=" + DefaultFormatRight
+	equalSign := DefaultFormatLeft + f.options.KeyValueDelimiterOnWrite + DefaultFormatRight
 
 	if PrettyFormat || PrettyEqual {
-		equalSign = " = "
+		equalSign = fmt.Sprintf(" %s ", f.options.KeyValueDelimiterOnWrite)
 	}
 
 	// Use buffer to make sure target is safe until finish encoding.

file_test.go

@@ -306,6 +306,43 @@ func TestFile_SaveTo(t *testing.T) {
 	})
 }
 
+func TestFile_WriteToWithOutputDelimiter(t *testing.T) {
+	Convey("Write content to somewhere using a custom output delimiter", t, func() {
+		f, err := ini.LoadSources(ini.LoadOptions{
+			KeyValueDelimiterOnWrite: "->",
+		}, []byte(`[Others]
+Cities = HangZhou|Boston
+Visits = 1993-10-07T20:17:05Z, 1993-10-07T20:17:05Z
+Years = 1993,1994
+Numbers = 10010,10086
+Ages = 18,19
+Populations = 12345678,98765432
+Coordinates = 192.168,10.11
+Flags       = true,false
+Note = Hello world!`))
+		So(err, ShouldBeNil)
+		So(f, ShouldNotBeNil)
+
+		var actual bytes.Buffer
+		var expected = []byte(`[Others]
+Cities      -> HangZhou|Boston
+Visits      -> 1993-10-07T20:17:05Z, 1993-10-07T20:17:05Z
+Years       -> 1993,1994
+Numbers     -> 10010,10086
+Ages        -> 18,19
+Populations -> 12345678,98765432
+Coordinates -> 192.168,10.11
+Flags       -> true,false
+Note        -> Hello world!
+
+`)
+		_, err = f.WriteTo(&actual)
+		So(err, ShouldBeNil)
+
+		So(bytes.Equal(expected, actual.Bytes()), ShouldBeTrue)
+	})
+}
+
 // Inspired by https://github.com/go-ini/ini/issues/207
 func TestReloadAfterShadowLoad(t *testing.T) {
 	Convey("Reload file after ShadowLoad", t, func() {

ini.go

@@ -103,6 +103,8 @@ type LoadOptions struct {
 	UnparseableSections []string
 	// KeyValueDelimiters is the sequence of delimiters that are used to separate key and value. By default, it is "=:".
 	KeyValueDelimiters string
+	// KeyValueDelimiters is the delimiter that are used to separate key and value output. By default, it is "=".
+	KeyValueDelimiterOnWrite string
 	// PreserveSurroundedQuote indicates whether to preserve surrounded quote (single and double quotes).
 	PreserveSurroundedQuote bool
 	// DebugFunc is called to collect debug information (currently only useful to debug parsing Python-style multiline values).