Added support for removing events in calendar

Signed-off-by: Jim Martens <github@2martens.de>

CHANGES.txt

@@ -1,6 +1,8 @@
 1.0.2
 -----
 
+* added support for removing events in the calendar
+ (achieved by deleting all event files prior to creating them)
 * added changes.txt file (including changes for 1.0.1)
 
 1.0.1

src/twomartens/calendarsync/calendarsync.py

@@ -17,6 +17,8 @@
 """calendarsync.calendarsync: provides entry point main()"""
 import argparse
 import datetime
+import glob
+import os
 from os.path import isdir
 
 import pkg_resources
@@ -53,6 +55,12 @@ def sync(calendar_url: str, event_collection_path: str) -> None:
     )
     with open(template_filename, 'r', encoding='utf-8') as template:
         template_content = template.read()
+    
+    # remove previous event files in directory to allow the removal of events in calendar
+    files = glob.glob(event_collection_path + '*.markdown')
+    for file in files:
+        os.remove(file)
+    
     for event in calendar.events:
         event_content = template_content.replace('<name>', event.name)
         created: datetime.datetime = event.created