ENH add option to only test the dependency tree and spit out results

bin/xmobar.hs

@@ -11,6 +11,8 @@ module Main (main) where
 -- * Theme integration with xmonad (shared module imported below)
 -- * A custom Locks plugin from my own forked repo
 
+import           Control.Monad
+
 import           Data.Internal.DBus
 import           Data.Internal.Dependency
 import           Data.List
@@ -52,6 +54,7 @@ main = getArgs >>= parse
 parse :: [String] -> IO ()
 parse []         = run
 parse ["--deps"] = withCache printDeps
+parse ["--test"] = void $ withCache . evalConfig =<< connectDBus
 parse _          = usage
 
 run :: IO ()

bin/xmonad.hs

@@ -71,8 +71,10 @@ main = getArgs >>= parse
 parse :: [String] -> IO ()
 parse []         = run
 parse ["--deps"] = withCache printDeps
+parse ["--test"] = void $ withCache . evalConf =<< connectDBusX
 parse _          = usage
 
+
 run :: IO ()
 run = do
   db <- connectDBusX