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authorjao <jao@gnu.org>2018-11-21 23:51:41 +0000
committerjao <jao@gnu.org>2018-11-21 23:51:41 +0000
commit50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d (patch)
treea710ee9a8e9ea9e46951d371af29081e1c72f502 /src/lib/Xmobar/XUtil.hsc
parent7674145b878fd315999558075edcfc5e09bdd91c (diff)
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+-----------------------------------------------------------------------------
+-- |
+-- Module : XUtil
+-- Copyright : (C) 2011, 2012, 2013, 2014, 2015, 2017, 2018 Jose Antonio Ortega Ruiz
+-- (C) 2007 Andrea Rossato
+-- License : BSD3
+--
+-- Maintainer : jao@gnu.org
+-- Stability : unstable
+-- Portability : unportable
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.XUtil
+ ( XFont
+ , initFont
+ , initCoreFont
+ , initUtf8Font
+ , textExtents
+ , textWidth
+ , printString
+ , newWindow
+ , nextEvent'
+ , readFileSafe
+ , hGetLineSafe
+ , io
+ , fi
+ ) where
+
+import Control.Concurrent
+import Control.Monad (when)
+import Control.Monad.Trans
+import Control.Exception (SomeException, handle)
+import Data.List
+import Foreign
+import Graphics.X11.Xlib hiding (textExtents, textWidth)
+import qualified Graphics.X11.Xlib as Xlib (textExtents, textWidth)
+import Graphics.X11.Xlib.Extras
+import System.Mem.Weak ( addFinalizer )
+import System.Posix.Types (Fd(..))
+import System.IO
+
+#if defined XFT || defined UTF8
+# if __GLASGOW_HASKELL__ < 612
+import qualified System.IO.UTF8 as UTF8 (readFile,hGetLine)
+# else
+import qualified System.IO as UTF8 (readFile,hGetLine)
+# endif
+#endif
+#if defined XFT
+import Xmobar.MinXft
+import Graphics.X11.Xrender
+#endif
+
+import Xmobar.ColorCache
+
+readFileSafe :: FilePath -> IO String
+#if defined XFT || defined UTF8
+readFileSafe = UTF8.readFile
+#else
+readFileSafe = readFile
+#endif
+
+hGetLineSafe :: Handle -> IO String
+#if defined XFT || defined UTF8
+hGetLineSafe = UTF8.hGetLine
+#else
+hGetLineSafe = hGetLine
+#endif
+
+-- Hide the Core Font/Xft switching here
+data XFont = Core FontStruct
+ | Utf8 FontSet
+#ifdef XFT
+ | Xft [AXftFont]
+#endif
+
+-- | When initFont gets a font name that starts with 'xft:' it switchs
+-- to the Xft backend Example: 'xft:Sans-10'
+initFont :: Display -> String -> IO XFont
+initFont d s =
+ let xftPrefix = "xft:" in
+ if xftPrefix `isPrefixOf` s then
+#ifdef XFT
+ fmap Xft $ initXftFont d s
+#else
+ do
+ hPutStrLn stderr $ "Warning: Xmobar must be built with "
+ ++ "the with_xft flag to support font '" ++ s
+ ++ ".' Falling back on default."
+ initFont d miscFixedFont
+#endif
+ else
+#if defined UTF8 || __GLASGOW_HASKELL__ >= 612
+ fmap Utf8 $ initUtf8Font d s
+#else
+ fmap Core $ initCoreFont d s
+#endif
+
+miscFixedFont :: String
+miscFixedFont = "-misc-fixed-*-*-*-*-*-*-*-*-*-*-*-*"
+
+-- | Given a fontname returns the font structure. If the font name is
+-- not valid the default font will be loaded and returned.
+initCoreFont :: Display -> String -> IO FontStruct
+initCoreFont d s = do
+ f <- handle fallBack getIt
+ addFinalizer f (freeFont d f)
+ return f
+ where getIt = loadQueryFont d s
+ fallBack :: SomeException -> IO FontStruct
+ fallBack = const $ loadQueryFont d miscFixedFont
+
+-- | Given a fontname returns the font structure. If the font name is
+-- not valid the default font will be loaded and returned.
+initUtf8Font :: Display -> String -> IO FontSet
+initUtf8Font d s = do
+ setupLocale
+ (_,_,f) <- handle fallBack getIt
+ addFinalizer f (freeFontSet d f)
+ return f
+ where getIt = createFontSet d s
+ fallBack :: SomeException -> IO ([String], String, FontSet)
+ fallBack = const $ createFontSet d miscFixedFont
+
+#ifdef XFT
+initXftFont :: Display -> String -> IO [AXftFont]
+initXftFont d s = do
+ setupLocale
+ let fontNames = wordsBy (== ',') (drop 4 s)
+ mapM openFont fontNames
+ where
+ openFont fontName = do
+ f <- openAXftFont d (defaultScreenOfDisplay d) fontName
+ addFinalizer f (closeAXftFont d f)
+ return f
+ wordsBy p str = case dropWhile p str of
+ "" -> []
+ str' -> w : wordsBy p str''
+ where
+ (w, str'') = break p str'
+#endif
+
+textWidth :: Display -> XFont -> String -> IO Int
+textWidth _ (Utf8 fs) s = return $ fi $ wcTextEscapement fs s
+textWidth _ (Core fs) s = return $ fi $ Xlib.textWidth fs s
+#ifdef XFT
+textWidth dpy (Xft xftdraw) s = do
+ gi <- xftTxtExtents' dpy xftdraw s
+ return $ xglyphinfo_xOff gi
+#endif
+
+textExtents :: XFont -> String -> IO (Int32,Int32)
+textExtents (Core fs) s = do
+ let (_,a,d,_) = Xlib.textExtents fs s
+ return (a,d)
+textExtents (Utf8 fs) s = do
+ let (_,rl) = wcTextExtents fs s
+ ascent = fi $ - (rect_y rl)
+ descent = fi $ rect_height rl + fi (rect_y rl)
+ return (ascent, descent)
+#ifdef XFT
+textExtents (Xft xftfonts) _ = do
+ ascent <- fi `fmap` xft_ascent' xftfonts
+ descent <- fi `fmap` xft_descent' xftfonts
+ return (ascent, descent)
+#endif
+
+printString :: Display -> Drawable -> XFont -> GC -> String -> String
+ -> Position -> Position -> String -> Int -> IO ()
+printString d p (Core fs) gc fc bc x y s a = do
+ setFont d gc $ fontFromFontStruct fs
+ withColors d [fc, bc] $ \[fc', bc'] -> do
+ setForeground d gc fc'
+ when (a == 255) (setBackground d gc bc')
+ drawImageString d p gc x y s
+
+printString d p (Utf8 fs) gc fc bc x y s a =
+ withColors d [fc, bc] $ \[fc', bc'] -> do
+ setForeground d gc fc'
+ when (a == 255) (setBackground d gc bc')
+ io $ wcDrawImageString d p fs gc x y s
+
+#ifdef XFT
+printString dpy drw fs@(Xft fonts) _ fc bc x y s al =
+ withDrawingColors dpy drw fc bc $ \draw fc' bc' -> do
+ when (al == 255) $ do
+ (a,d) <- textExtents fs s
+ gi <- xftTxtExtents' dpy fonts s
+ drawXftRect draw bc' x (y - a) (1 + xglyphinfo_xOff gi) (a + d + 2)
+ drawXftString' draw fc' fonts (toInteger x) (toInteger y) s
+#endif
+
+
+-- | Creates a window with the attribute override_redirect set to True.
+-- Windows Managers should not touch this kind of windows.
+newWindow :: Display -> Screen -> Window -> Rectangle -> Bool -> IO Window
+newWindow dpy scr rw (Rectangle x y w h) o = do
+ let visual = defaultVisualOfScreen scr
+ attrmask = if o then cWOverrideRedirect else 0
+ allocaSetWindowAttributes $
+ \attributes -> do
+ set_override_redirect attributes o
+ createWindow dpy rw x y w h 0 (defaultDepthOfScreen scr)
+ inputOutput visual attrmask attributes
+-- | A version of nextEvent that does not block in foreign calls.
+nextEvent' :: Display -> XEventPtr -> IO ()
+nextEvent' d p = do
+ pend <- pending d
+ if pend /= 0
+ then nextEvent d p
+ else do
+ threadWaitRead (Fd fd)
+ nextEvent' d p
+ where
+ fd = connectionNumber d
+
+io :: MonadIO m => IO a -> m a
+io = liftIO
+
+-- | Short-hand for 'fromIntegral'
+fi :: (Integral a, Num b) => a -> b
+fi = fromIntegral
+
+#if __GLASGOW_HASKELL__ < 612 && (defined XFT || defined UTF8)
+#include <locale.h>
+foreign import ccall unsafe "locale.h setlocale"
+ setlocale :: CInt -> CString -> IO CString
+
+setupLocale :: IO ()
+setupLocale = withCString "" (setlocale $ #const LC_ALL) >> return ()
+# else
+setupLocale :: IO ()
+setupLocale = return ()
+#endif