I have something similar that I use in Juno, would be good with a native atom solution though
https://github.com/baggepinnen/AutomaticDocstrings.jl
I have an atom script that does almost the same thing, but my Javascript skills are nonexistent so I didn’t really get it all the way, code in this issue
https://github.com/JunoLab/atom-julia-client/issues/519