It's not quite the same, but I keep a similar file that notes: installed packages from the distribution repository, installed packages from AUR, enabled service

It's not quite the same, but I keep a similar file that notes: installed packages from the distribution repository, installed packages from AUR, enabled services, and installed extensions from programs where they can be installed from the command line. (Plus I'll note what has been removed, so I don't forgetfully install things that I've had problems with in the past.) Since everything is one item per line with few extraneous notes, it is easy to pull into Vim and modify into a script. Properly taken notes are much more than a memory aide.