xmobar -> test own Modules 4

home/programs/xmonad/src/xmobar/ColorCache..hs

@@ -0,0 +1,110 @@
+{-# LANGUAGE CPP #-}
+------------------------------------------------------------------------------
+-- |
+-- Module: ColorCache
+-- Copyright: (c) 2012 Jose Antonio Ortega Ruiz
+-- License: BSD3-style (see LICENSE)
+--
+-- Maintainer: jao@gnu.org
+-- Stability: unstable
+-- Portability: unportable
+-- Created: Mon Sep 10, 2012 00:27
+--
+--
+-- Caching X colors
+--
+------------------------------------------------------------------------------
+
+#if defined XFT
+
+module ColorCache(withColors, withDrawingColors) where
+
+import MinXft
+
+#else
+module ColorCache(withColors) where
+
+#endif
+
+import Data.IORef
+import System.IO.Unsafe (unsafePerformIO)
+import Control.Monad.Trans (MonadIO, liftIO)
+import Control.Exception (SomeException, handle)
+import Graphics.X11.Xlib
+
+data DynPixel = DynPixel Bool Pixel
+
+initColor :: Display -> String -> IO DynPixel
+initColor dpy c = handle black $ (initColor' dpy c)
+  where
+    black :: SomeException -> IO DynPixel
+    black = (const . return $ DynPixel False (blackPixel dpy $ defaultScreen dpy))
+
+type ColorCache = [(String, Color)]
+{-# NOINLINE colorCache #-}
+colorCache :: IORef ColorCache
+colorCache = unsafePerformIO $ newIORef []
+
+getCachedColor :: String -> IO (Maybe Color)
+getCachedColor color_name = lookup color_name `fmap` readIORef colorCache
+
+putCachedColor :: String -> Color -> IO ()
+putCachedColor name c_id = modifyIORef colorCache $ \c -> (name, c_id) : c
+
+initColor' :: Display -> String -> IO DynPixel
+initColor' dpy c = do
+  let colormap = defaultColormap dpy (defaultScreen dpy)
+  cached_color <- getCachedColor c
+  c' <- case cached_color of
+          Just col -> return col
+          _        -> do (c'', _) <- allocNamedColor dpy colormap c
+                         putCachedColor c c''
+                         return c''
+  return $ DynPixel True (color_pixel c')
+
+withColors :: MonadIO m => Display -> [String] -> ([Pixel] -> m a) -> m a
+withColors d cs f = do
+  ps <- mapM (liftIO . initColor d) cs
+  f $ map (\(DynPixel _ pixel) -> pixel) ps
+
+#ifdef XFT
+
+type AXftColorCache = [(String, AXftColor)]
+{-# NOINLINE xftColorCache #-}
+xftColorCache :: IORef AXftColorCache
+xftColorCache = unsafePerformIO $ newIORef []
+
+getXftCachedColor :: String -> IO (Maybe AXftColor)
+getXftCachedColor name = lookup name `fmap` readIORef xftColorCache
+
+putXftCachedColor :: String -> AXftColor -> IO ()
+putXftCachedColor name cptr =
+  modifyIORef xftColorCache $ \c -> (name, cptr) : c
+
+initAXftColor' :: Display -> Visual -> Colormap -> String -> IO AXftColor
+initAXftColor' d v cm c = do
+  cc <- getXftCachedColor c
+  c' <- case cc of
+          Just col -> return col
+          _        -> do c'' <- mallocAXftColor d v cm c
+                         putXftCachedColor c c''
+                         return c''
+  return c'
+
+initAXftColor :: Display -> Visual -> Colormap -> String -> IO AXftColor
+initAXftColor d v cm c = handle black $ (initAXftColor' d v cm c)
+  where
+    black :: SomeException -> IO AXftColor
+    black = (const $ initAXftColor' d v cm "black")
+
+withDrawingColors :: -- MonadIO m =>
+                     Display -> Drawable -> String -> String
+                    -> (AXftDraw -> AXftColor -> AXftColor -> IO ()) -> IO ()
+withDrawingColors dpy drw fc bc f = do
+  let screen = defaultScreenOfDisplay dpy
+      colormap = defaultColormapOfScreen screen
+      visual = defaultVisualOfScreen screen
+  fc' <- initAXftColor dpy visual colormap fc
+  bc' <- initAXftColor dpy visual colormap bc
+  withAXftDraw dpy drw visual colormap $ \draw -> f draw fc' bc'
+#endif

home/programs/xmonad/src/xmobar/xmobar-custom.cabal

@@ -43,14 +43,16 @@ executable xmobar
     main-is:          xmobar.hs
 
     other-modules:    Commands,
+                      ColorCache,
                       XUtil,
                       Plugins,
                       Plugins.Audio
     -- Other library packages from which modules are imported.
     build-depends:    base ^>=4.17.2.1,
                       xmobar ^>=0.47.1,
-                      process ^>=1.6.18.0
+                      process ^>=1.6.18.0,
-
+                      mtl >= 2.0 && < 2.2,
+                      X11 >= 1.6.1
     -- Directories containing source files.
     hs-source-dirs:   .