This project is to contain a user definied language (UDL) for Notepad++ to support the PlantUML language syntax.
So far this works for all diagrams I have made but you may experience issues and please contribute.
I have not implemented code folding support here. Just the highlighting of keywords and basic operators.
See below link to install this in your installation: https://npp-user-manual.org/docs/user-defined-language-system/#import-a-udl