X.H.SB.PP: Move ppTitleUnfocused to X.U.Loggers

This way, people not using this functionality don't get the burden of a
bunch of `getName`s that they haven't asked about.

XMonad/Hooks/StatusBar/PP.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE NamedFieldPuns      #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  XMonad.Hooks.StatusBar.PP
@@ -47,7 +48,6 @@ module XMonad.Hooks.StatusBar.PP (
 
 import Control.Applicative (liftA2)
 import Control.Monad (msum)
-import Data.Bool (bool)
 import Data.Char (isSpace)
 import Data.List (intercalate, isPrefixOf, sortOn, stripPrefix)
 import Data.Maybe (catMaybes, fromMaybe, isJust, mapMaybe)
@@ -102,11 +102,8 @@ data PP = PP { ppCurrent :: WorkspaceId -> String
                -- ^ separator to use between workspace tags
              , ppTitle :: String -> String
                -- ^ window title format for the focused window
-             , ppTitleUnfocused :: String -> String
-               -- ^ window title format for unfocused windows
              , ppTitleSanitize :: String -> String
-              -- ^ escape / sanitizes input to 'ppTitle' and
-              --   'ppTitleUnfocused'
+              -- ^ escape / sanitizes input to 'ppTitle'
              , ppLayout :: String -> String
                -- ^ layout name format
              , ppOrder :: [String] -> [String]
@@ -155,7 +152,6 @@ instance Default PP where
            , ppSep              = " : "
            , ppWsSep            = " "
            , ppTitle            = shorten 80
-           , ppTitleUnfocused   = const ""
            , ppTitleSanitize    = xmobarStrip . dzenEscape
            , ppLayout           = id
            , ppOrder            = id
@@ -186,22 +182,16 @@ dynamicLogString pp = do
     -- workspace list
     let ws = pprWindowSet sort' urgents pp winset
 
-    -- window titles
-    let stack  = S.index winset
-        focWin = S.peek  winset
-        ppWin :: Window -> String -> String  -- pretty print a window title
-            = bool (ppTitleUnfocused pp) (ppTitle pp) . (focWin ==) . Just
-    winNames <- traverse (fmap show . getName) stack
-    let ppNames = unwords . filter (not . null) $
-            zipWith (\w n -> ppWin w $ ppTitleSanitize pp n) stack winNames
-
     -- run extra loggers, ignoring any that generate errors.
     extras <- mapM (`catchX` return Nothing) $ ppExtras pp
 
+    -- window title
+    wt <- maybe (pure "") (fmap show . getName) . S.peek $ winset
+
     return $ sepBy (ppSep pp) . ppOrder pp $
                         [ ws
                         , ppLayout pp ld
-                        , ppNames
+                        , ppTitle  pp $ ppTitleSanitize pp wt
                         ]
                         ++ catMaybes extras
 

XMonad/Util/Loggers.hs

@@ -31,7 +31,7 @@ module XMonad.Util.Loggers (
 
     -- * XMonad Loggers
     -- $xmonad
-    , logCurrent, logLayout, logTitle
+    , logCurrent, logLayout, logTitle, logTitles
     , logConst, logDefault, (.|)
     -- * XMonad: Screen-specific Loggers
     -- $xmonad-screen
@@ -47,7 +47,7 @@ module XMonad.Util.Loggers (
 
   ) where
 
-import XMonad (liftIO, Window)
+import XMonad (liftIO, Window, gets)
 import XMonad.Core
 import qualified XMonad.StackSet as W
 import XMonad.Hooks.DynamicLog
@@ -175,6 +175,35 @@ maildirNew mdir = logFileCount (mdir ++ "/new/") (not . isPrefixOf ".")
 logTitle :: Logger
 logTitle = withWindowSet $ traverse (fmap show . getName) . W.peek
 
+-- | Get the titles of all windows on the current workspace and format
+-- them according to the given functions.
+--
+-- ==== __Example__
+--
+-- > myXmobarPP :: X PP
+-- > myXmobarPP = pure $ def
+-- >   { ppOrder  = [ws, l, _, wins] -> [ws, l, wins]
+-- >   , ppExtras = [logTitles formatFocused formatUnfocused]
+-- >   }
+-- >  where
+-- >   formatFocused   = wrap "[" "]" . xmobarColor "#ff79c6" "" . shorten 50 . xmobarStrip
+-- >   formatUnfocused = wrap "(" ")" . xmobarColor "#bd93f9" "" . shorten 30 . xmobarStrip
+--
+logTitles
+  :: (String -> String) -- ^ Formatting for the focused   window
+  -> (String -> String) -- ^ Formatting for the unfocused window
+  -> Logger
+logTitles formatFoc formatUnfoc = do
+  winset <- gets windowset
+  let focWin = W.peek  winset
+      wins   = W.index winset
+  winNames <- traverse (fmap show . getName) wins
+  pure . Just
+       . unwords
+       $ zipWith (\w n -> if Just w == focWin then formatFoc n else formatUnfoc n)
+                 wins
+                 winNames
+
 -- | Get the name of the current layout.
 logLayout :: Logger
 logLayout = withWindowSet $ return . Just . ld