Projections are a way to define relations between files. Every file can have a "related" or "alternate" file. It's common to consider spec files to be "alternate" files to source files.
How to use it
- Install an editor plugin that consumes projections
How to customize it
You can find a basic list of projection options in projectionist.txt
Which plugins can I use
This started as a plugin for vim by tpope It has since become editor-agnostic and ported to most modern editors.