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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/Xmobar/XUtil.hsc
parent7674145b878fd315999558075edcfc5e09bdd91c (diff)
downloadxmobar-50134d5b5c4baabdfb35c0aeb8bf53d29f009c4d.tar.gz
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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