configurable border colors

This also fixes a bug where xmonad was assuming a 24-bit display, and just
using, eg, 0xff0000 as an index into a colormap without querying the X server
to determine the proper pixel value for "red".

Config.hs

@@ -106,6 +106,11 @@ defaultDelta = 3%100
 numlockMask :: KeyMask
 numlockMask = mod2Mask
 
+-- Border colors for unfocused and focused windows, respectively.
+normalBorderColor, focusedBorderColor :: String
+normalBorderColor  = "#dddddd"
+focusedBorderColor = "#ff0000"
+
 -- What layout to start in, and what the default proportion for the
 -- left pane should be in the tiled layout.  See LayoutDesc and
 -- friends in XMonad.hs for options.

Main.hs

@@ -35,10 +35,14 @@ main :: IO ()
 main = do
     dpy   <- openDisplay ""
     let dflt = defaultScreen dpy
+        initcolor c = fst `liftM` allocNamedColor dpy (defaultColormap dpy dflt) c
+
     rootw  <- rootWindow dpy dflt
     wmdelt <- internAtom dpy "WM_DELETE_WINDOW" False
     wmprot <- internAtom dpy "WM_PROTOCOLS"     False
     xinesc <- getScreenInfo dpy
+    nbc    <- initcolor normalBorderColor
+    fbc    <- initcolor focusedBorderColor
 
     let st = XState
             { display       = dpy
@@ -52,6 +56,8 @@ main = do
             , workspace     = W.empty workspaces (length xinesc)
             , defaultLayoutDesc = startingLayoutDesc
             , layoutDescs   = M.empty
+            , normalBorder  = nbc
+            , focusedBorder = fbc
             }
 
     xSetErrorHandler -- in C, I'm too lazy to write the binding

Operations.hs

@@ -189,17 +189,18 @@ safeFocus w = do ws <- gets workspace
 -- | Explicitly set the keyboard focus to the given window
 setFocus :: Window -> X ()
 setFocus w = do
-    ws <- gets workspace
+    XState { workspace = ws, display = dpy
+           , normalBorder = nbc, focusedBorder = fbc } <- get
 
     -- clear mouse button grab and border on other windows
     flip mapM_ (W.visibleWorkspaces ws) $ \n -> do
         flip mapM_ (W.index n ws) $ \otherw -> do
             setButtonGrab True otherw
-            setBorder otherw 0xdddddd
+            io $ setWindowBorder dpy otherw (color_pixel nbc)
 
     withDisplay $ \d -> io $ setInputFocus d w revertToPointerRoot 0
     setButtonGrab False w
-    setBorder w 0xff0000    -- make this configurable
+    io $ setWindowBorder dpy w (color_pixel fbc)
 
     -- This does not use 'windows' intentionally.  'windows' calls refresh,
     -- which means infinite loops.
@@ -213,10 +214,6 @@ setTopFocus = do
         Just new -> setFocus new
         Nothing  -> gets theRoot >>= setFocus
 
--- | Set the border color for a particular window.
-setBorder :: Window -> Pixel -> X ()
-setBorder w p = withDisplay $ \d -> io $ setWindowBorder d w p
-
 -- | raise. focus to window at offset 'n' in list.
 -- The currently focused window is always the head of the list
 raise :: Ordering -> X ()

XMonad.hs

@@ -46,6 +46,8 @@ data XState = XState
     , defaultLayoutDesc :: !LayoutDesc                     -- ^ default layout
     , layoutDescs       :: !(M.Map WorkspaceId LayoutDesc) -- ^ mapping of workspaces 
                                                            -- to descriptions of their layouts
+    , normalBorder      :: !Color                         -- ^ border color of unfocused windows
+    , focusedBorder     :: !Color                         -- ^ border color of the focused window
     }
 
 type WindowSet = StackSet WorkspaceId ScreenId Window