Hi, I don’t use kdb+ myself, but I have been using various APL variants for some time. I recently wrote a small plugin for using various interpreters with my favorite editor, which is Vim. I use it in a “notebook” style, mixing documentation and “cells” of code which can be evaluated at any time inside the document (with a persistent state between successive calls). Terse languages like APL, J, K, etc. can be used very well with this system. I just downloaded kdb+ in oder to see if I could make it work with my plugin and it works very well. If you wan’t to have a look: https://github.com/baruchel/vim-notebook
You will find a video with various other languages. You will not see kdb+ in the video because it is older, but you will see how it works with APL or J. Relevant settings for using the kdb+ interpreter are included on the web page.
Best regards, tb.