Refactor config types into separate files

lib/config/versioningconfiguration.go

@@ -0,0 +1,50 @@
+// Copyright (C) 2014 The Syncthing Authors.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package config
+
+import "encoding/xml"
+
+type VersioningConfiguration struct {
+	Type   string            `xml:"type,attr" json:"type"`
+	Params map[string]string `json:"params"`
+}
+
+type InternalVersioningConfiguration struct {
+	Type   string          `xml:"type,attr,omitempty"`
+	Params []InternalParam `xml:"param"`
+}
+
+type InternalParam struct {
+	Key string `xml:"key,attr"`
+	Val string `xml:"val,attr"`
+}
+
+func (c *VersioningConfiguration) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	var tmp InternalVersioningConfiguration
+	tmp.Type = c.Type
+	for k, v := range c.Params {
+		tmp.Params = append(tmp.Params, InternalParam{k, v})
+	}
+
+	return e.EncodeElement(tmp, start)
+
+}
+
+func (c *VersioningConfiguration) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var tmp InternalVersioningConfiguration
+	err := d.DecodeElement(&tmp, &start)
+	if err != nil {
+		return err
+	}
+
+	c.Type = tmp.Type
+	c.Params = make(map[string]string, len(tmp.Params))
+	for _, p := range tmp.Params {
+		c.Params[p.Key] = p.Val
+	}
+	return nil
+}