Auto Lectern (Fabric) - ppisod's fork:

This mod basically breaks and places lecterns to cycle trades for you.

Usage:

Add a goal:
/autolec add [enchant]? [(minLevel, maxLevel)/min/max/any] [(minPrice, maxPrice)/min/max/any]
Look at a lectern
/autolec start
Stop:
/autolec stop
If there isn't any goal Auto Lectern will cycle forever.
If you wish to make Auto Lectern wait for the lectern item to be picked up first, do
/autolec sync item