runCommand -package:wai-app-static -package:graphviz -package:process -package:mongoDB -package:shake-plus -is:exact -package:pandoc-plot -package:quickcheck-state-machine -package:structured-cli -package:io-streams package:xmonad-contrib is:exact

Given a list of command/action pairs, prompt the user to choose a command using dmenu and return the corresponding action.