calcurse-caldav: Add SyncFilter config option

The SyncFilter option filters the types of items synced from/to a CalDAV
server by making use of the --filter-type command line argument.

Signed-off-by: Satvik Sharma <satvik.sharma2@gmail.com>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

3 files changed, 53 insertions, 12 deletions

diff --git a/contrib/caldav/README.md b/contrib/caldav/README.md
index 63f6f20..35b789e 100644
--- a/contrib/caldav/README.md
+++ b/contrib/caldav/README.md
@@ -108,6 +108,7 @@ The following options should also be changed in your config file:
 Hostname = apidata.googleusercontent.com
 Path = /caldav/v2/*your_calendar_id_here*/events/
 Scope = https://www.googleapis.com/auth/calendar
+SyncFilter = cal
 ```
 
 Your Calendar ID for "*Path*" should be your email for the default calendar.
@@ -127,6 +128,7 @@ A complete config file for example@gmail.com would have the following options:
 Hostname = apidata.googleusercontent.com
 Path = /caldav/v2/example@gmail.com/events/
 AuthMethod = oauth2
+SyncFilter = cal
 
 ...
 
diff --git a/contrib/caldav/calcurse-caldav.py b/contrib/caldav/calcurse-caldav.py
index 1d0a0c8..bc6d714 100755
--- a/contrib/caldav/calcurse-caldav.py
+++ b/contrib/caldav/calcurse-caldav.py
@@ -44,6 +44,11 @@ def die_atnode(msg, node):
     die(msg)
 
 
+def validate_sync_filter():
+    valid_sync_filter_values = {'event', 'apt', 'recur-event', 'recur-apt', 'todo', 'recur', 'cal'}
+    return set(sync_filter.split(',')) - valid_sync_filter_values
+
+
 def calcurse_wipe():
     if verbose:
         print('Removing all local calcurse objects...')
@@ -53,13 +58,20 @@ def calcurse_wipe():
 
 
 def calcurse_import(icaldata):
-    p = subprocess.Popen([calcurse, '-i', '-', '--dump-imported', '-q',
-                          '--format-apt=%(hash)\\n',
-                          '--format-recur-apt=%(hash)\\n',
-                          '--format-event=%(hash)\\n',
-                          '--format-recur-event=%(hash)\\n',
-                          '--format-todo=%(hash)\\n'],
-                         stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+    command = [
+        calcurse,
+        '-i', '-',
+        '--dump-imported',
+        '-q',
+        '--filter-type', sync_filter,
+        '--format-apt=%(hash)\\n',
+        '--format-recur-apt=%(hash)\\n',
+        '--format-event=%(hash)\\n',
+        '--format-recur-event=%(hash)\\n',
+        '--format-todo=%(hash)\\n'
+    ]
+
+    p = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
     return p.communicate(icaldata.encode('utf-8'))[0].decode('utf-8').rstrip()
 
 
@@ -70,11 +82,18 @@ def calcurse_export(objhash):
 
 
 def calcurse_hashset():
-    p = subprocess.Popen([calcurse, '-G', '--format-apt=%(hash)\\n',
-                          '--format-recur-apt=%(hash)\\n',
-                          '--format-event=%(hash)\\n',
-                          '--format-recur-event=%(hash)\\n',
-                          '--format-todo=%(hash)\\n'], stdout=subprocess.PIPE)
+    command = [
+        calcurse,
+        '-G',
+        '--filter-type', sync_filter,
+        '--format-apt=%(hash)\\n',
+        '--format-recur-apt=%(hash)\\n',
+        '--format-event=%(hash)\\n',
+        '--format-recur-event=%(hash)\\n',
+        '--format-todo=%(hash)\\n'
+    ]
+
+    p = subprocess.Popen(command, stdout=subprocess.PIPE)
     return set(p.communicate()[0].decode('utf-8').rstrip().splitlines())
 
 
@@ -533,6 +552,16 @@ if config.has_option('General', 'AuthMethod'):
 else:
     authmethod = 'basic'
 
+if config.has_option('General', 'SyncFilter'):
+    sync_filter = config.get('General', 'SyncFilter')
+
+    invalid_filter_values = validate_sync_filter()
+
+    if len(invalid_filter_values):
+        die('Invalid value(s) in SyncFilter option: ' + ', '.join(invalid_filter_values))
+else:
+    sync_filter = 'cal,todo'
+
 if config.has_option('Auth', 'UserName'):
     username = config.get('Auth', 'UserName')
 else:
diff --git a/contrib/caldav/config.sample b/contrib/caldav/config.sample
index 76c3ce3..8cbc4be 100644
--- a/contrib/caldav/config.sample
+++ b/contrib/caldav/config.sample
@@ -18,6 +18,16 @@ Path = /path/to/calendar/on/the/server/
 # Enable this if you want to skip SSL certificate checks.
 InsecureSSL = No
 
+# This option allows you to filter the types of tasks synced. To this end, the
+# value of this option should be a comma-separated list of item types, where
+# each item type is either "event", "apt", "recur-event", "recur-apt", "todo",
+# "recur" or "cal". Note that the comma-separated list must not contain any
+# spaces. Refer to the documentation of the --filter-type command line argument
+# of calcurse for more details. Set this option to "cal" if the configured
+# CalDAV server doesn't support tasks, such as is the case with Google
+# Calendar.
+SyncFilter = cal,todo
+
 # Disable this option to actually enable synchronization. If it is enabled,
 # nothing is actually written to the server or to the local data files. If you
 # combine DryRun = Yes with Verbose = Yes, you get a log of what would have