runCommand -package:wai-app-static -package:libmpd -package:pandoc-plot -package:beam-migrate -package:shake -package:quickcheck-state-machine is:exact -package:options -package:process -package:cabal-install -package:graphviz -package:github-release -package:io-streams -package:mongoDB package:xmonad-contrib

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