Added json un/marshaling support

Author: cmaglie

json.go

@@ -0,0 +1,50 @@
+/*
+ * This file is part of PathsHelper library.
+ *
+ * Copyright 2018 Arduino AG (http://www.arduino.cc/)
+ *
+ * PathsHelper library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ */
+
+package paths
+
+import (
+	"encoding/json"
+)
+
+// MarshalJSON implements the json.Marshaler interface
+func (p *Path) MarshalJSON() ([]byte, error) {
+	return json.Marshal(p.path)
+}
+
+// UnmarshalJSON implements the json.Unmarshaler interface
+func (p *Path) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	(*p).path = s
+	(*p).cachedFileInfo = nil
+	return nil
+}