TaskPaper mode is a major mode for working with files in TaskPaper
format. The format was invented by Jesse Grosjean and named after his
TaskPaper macOS app , which is a system
for organizing your outlines and tasks in a text file.
TaskPaper mode is implemented on top of Outline mode. Visibility
cycling and structure editing help to work with the outline
structure. Special commands also provided for outline-aware filtering,
tags manipulation, sorting, refiling, and archiving of items.