images in calendar events now properly supported, fix #4

event_feed.py

@@ -76,14 +76,14 @@ def create_metadata(event):
 def localize_time(date):
     """
     Turn a given date into various timezones
+    Takes arrow objects
     """
-    # Dates need to be displayed for the various TZs
-    # takes arrow objects
 
     # 3 PM Kassel, Germany, 4 PM Ramallah/Jerusalem, Palestina (QoF),
     # 8 AM Bogota, Colombia (MaMa), 8 PM Jakarta, Indonesia (Gudskul),
     # 1 PM (+1day) Wellington, New Zealand (Fafswag), 9 AM Havana, Cuba (Instar).
     
+
     tzs = [
           ('Kassel','Europe/Berlin'),
           ('Bamako', 'Europe/London'),
@@ -105,24 +105,51 @@ def localize_time(date):
     return localized_begins
 
 def create_event_post(post_dir, event):
+    """
+    Create HUGO post based on calendar event metadata
+    Searches for image URLS in description and downloads them
+    Function is also called when post is in need of updating
+    In that case it will also delete images no longer in metadata
+    TODO: split this up into more functions for legibility
+    """
     
     if not os.path.exists(post_dir):
         os.mkdir(post_dir)
 
     event_metadata = create_metadata(event)
 
+    #list already existing images
+    #so we can later delete them if we dont find them in the event metadata anymore 
+    existing_images = os.listdir(post_dir)
+    try:
+        existing_images.remove('index.md')
+        existing_images.remove('.timestamp')
+    except:
+        pass
+
     for img in event_metadata['images']:
+
+        #parse img url to safe local image name
         img_name = img.split('/')[-1]
+        fn, ext = img_name.split('.')
+        img_name =  slugify(fn) + '.' + ext
+        
         local_image = os.path.join(post_dir, img_name)
-        #TODO: handle the fact that someone might update a post
-        #and delete / replace an image
+        
         if not os.path.exists(local_image):
             #download preview image
             response = requests.get(img, stream=True)
             with open(local_image, 'wb') as img_file:
                 shutil.copyfileobj(response.raw, img_file)
-                print('Downloaded event image for event "{}"'.format(event.name))
+                print('Downloaded image for event "{}"'.format(event.name))
             event_metadata['description'] = event_metadata['description'].replace(img, '![]({})'.format(img_name))
+        if img_name in existing_images:
+            existing_images.remove(img_name)
+
+    for left_over_image in existing_images:
+        #remove images we found, but which are no longer in remote event
+        os.remove(os.path.join(post_dir,left_over_image))
+        print('deleted image', left_over_image)
 
     with open(os.path.join(post_dir,'index.md'),'w') as f:
         post = template.render(event = event_metadata)