Adding support for sequence number property

README.md

@@ -274,6 +274,12 @@ Empty the Calender.
 Use this method to set the event's ID. If not set, an UID will be generated randomly.
 
 
+#### sequence([_Integer_ sequence])
+
+Use this method to set the event's revision sequence number of the
+calendar component within a sequence of revisions.
+
+
 #### start([_Date_ start])
 
 Appointment date of beginning as Date object. This is required for all events!

lib/event.js

@@ -7,7 +7,7 @@
  * @constructor ICalEvent Event
  */
 var ICalEvent = function(_data) {
-    var attributes = ['id', 'uid', 'start', 'end', 'stamp', 'timestamp', 'allDay', 'floating', 'repeating', 'summary', 'location', 'description', 'organizer', 'attendees', 'alarms', 'method', 'status', 'url'],
+    var attributes = ['id', 'uid', 'sequence', 'start', 'end', 'stamp', 'timestamp', 'allDay', 'floating', 'repeating', 'summary', 'location', 'description', 'organizer', 'attendees', 'alarms', 'method', 'status', 'url'],
         vars,
         i,
         data;
@@ -20,6 +20,7 @@ var ICalEvent = function(_data) {
 
     data = {
         id: ('0000' + (Math.random() * Math.pow(36, 4) << 0).toString(36)).substr(-4),
+        sequence: 0,
         start: null,
         end: null,
         stamp: new Date(),
@@ -65,6 +66,22 @@ var ICalEvent = function(_data) {
     this.uid = this.id;
 
 
+    /**
+     * Set/Get the event's SEQUENCE number
+     *
+     * @param id SEQUENCE
+     * @since 0.2.6
+     * @returns {ICalEvent|Integer}
+     */
+    this.sequence = function(sequence) {
+        if(!sequence) {
+            return data.sequence;
+        }
+
+        data.sequence = sequence;
+        return this;
+    };
+
     /**
      * Set/Get the event's start date
      *
@@ -566,6 +583,10 @@ var ICalEvent = function(_data) {
         // DATE & TIME
         g += 'BEGIN:VEVENT\r\n';
         g += 'UID:' + data.id + '@' + calendar.domain() + '\r\n';
+
+        // SEQUENCE
+        g += 'SEQUENCE:' + data.sequence + '\r\n';
+
         g += 'DTSTAMP:' + tools.formatDate(data.stamp) + '\r\n';
         if(data.allDay) {
             g += 'DTSTART;VALUE=DATE:' + tools.formatDate(data.start, true) + '\r\n';