Making changes to an entry without editing for use in a script

Hi,

I'ld like to have the option to change or add attributes to entries using commands.

Currently I can make changes using the edit command, but editing is interactive. I'm using Taskwarrior too. Taskwarrior supports the use in scripts. You can add, remove and change attributes for a task in a non-interactive manner. This is a very neat feature of Taskwarrior.

If this could be possible too in Khal, it would make my work much easier.

An example. I want to add references to notes in my file system to both calendar items in Khal and tasks in Taskwarrior. I then need at least a marker that notes are available, possibly with a reference to the name of the file, so a command like
$ khal modify [uid] --add-category "HasNotes.xyz"
could be used in a script to add a reference to a file with notes. Currently I can only add a category using the interactive edit command.

Thanks, Fred

Start by locating Khal's existing interactive edit command and its command-line entry point, then compare the requested behavior with Taskwarrior's scripted attribute changes. Done means a non-interactive command can add, remove, and change entry attributes, including adding a category for the proposed notes reference.