runCommand -package:structured-cli -package:github-release -package:mongoDB -package:pandoc-plot -package:wai-app-static -package:cabal-install -package:shake-plus -package:io-streams -package:quickcheck-state-machine is:exact package:xmonad-contrib

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