ditaa

Installation

pacman -S ditaa

Usage

1. Create a directory and create a txt file in it.
2. Give a name to the txt file.
3. Insert plantuml syntax for a sequence diagram (or any other kind of diagram).
4. Launch plantuml from terminal in that directory.
5. The UI for plantuml will open and it will show all the available diagrams as png images from that directory.
6. The png images are also available in the same directory as exported files.

ditaa temp.txt

Reference

https://ditaa.sourceforge.net/