runCommand -package:shake -package:amazonka-cloudwatch-events -is:exact -package:mongoDB -package:structured-cli is:exact -package:process -package:pandoc-plot -package:github-release -package:options -package:hledger -package:cabal-install -package:graphviz package:xmonad-contrib

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