Source at: https://github.com/xuhcc/mindstream
filter incoming lines based on date threshold
hides tasks marked with a date threshold ("t:YYYY-MM-DD") in the future
This seems like a pretty good way to handle adding add-ons.
See also: https://github.com/sanpii/effitask
Supported toto.txt addons:
community members have built more apps and add-ons that work with Todo.txt.