xmobar-0.20: src/Xmobar.hs
{-# LANGUAGE DeriveDataTypeable, CPP #-}
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A status bar for the Xmonad Window Manager
--
-----------------------------------------------------------------------------
module Xmobar
( -- * Main Stuff
-- $main
X , XConf (..), runX
, startLoop
-- * Program Execution
-- $command
, startCommand
-- * Window Management
-- $window
, createWin
-- * Printing
-- $print
, drawInWin, printStrings
) where
import Prelude hiding (lookup)
import Graphics.X11.Xlib hiding (textExtents, textWidth)
import Graphics.X11.Xlib.Extras
import Graphics.X11.Xinerama
import Graphics.X11.Xrandr
import Control.Arrow ((&&&))
import Control.Monad.Reader
import Control.Concurrent
import Control.Concurrent.STM
import Control.Exception (handle, SomeException(..))
import Data.Bits
import Data.Map hiding (foldr, map, filter)
import Data.Maybe (fromJust)
import Bitmap
import Config
import Parsers
import Commands
import Actions
import Runnable
import Signal
import Window
import XUtil
import ColorCache
#ifdef XFT
import Graphics.X11.Xft
#endif
#ifdef DBUS
import IPC.DBus
#endif
-- $main
--
-- The Xmobar data type and basic loops and functions.
-- | The X type is a ReaderT
type X = ReaderT XConf IO
-- | The ReaderT inner component
data XConf =
XConf { display :: Display
, rect :: Rectangle
, window :: Window
, fontS :: XFont
, iconS :: Map FilePath Bitmap
, config :: Config
}
-- | Runs the ReaderT
runX :: XConf -> X () -> IO ()
runX xc f = runReaderT f xc
-- | Starts the main event loop and threads
startLoop :: XConf -> TMVar SignalType -> [[(Maybe ThreadId, TVar String)]] -> IO ()
startLoop xcfg@(XConf _ _ w _ _ _) sig vs = do
#ifdef XFT
xftInitFtLibrary
#endif
tv <- atomically $ newTVar []
_ <- forkIO (handle (handler "checker") (checker tv [] vs sig))
#ifdef THREADED_RUNTIME
_ <- forkOS (handle (handler "eventer") (eventer sig))
#else
_ <- forkIO (handle (handler "eventer") (eventer sig))
#endif
#ifdef DBUS
runIPC sig
#endif
eventLoop tv xcfg [] sig
where
handler thing (SomeException _) =
void $ putStrLn ("Thread " ++ thing ++ " failed")
-- Reacts on events from X
eventer signal =
allocaXEvent $ \e -> do
dpy <- openDisplay ""
xrrSelectInput dpy (defaultRootWindow dpy) rrScreenChangeNotifyMask
selectInput dpy w (exposureMask .|. structureNotifyMask .|. buttonPressMask)
forever $ do
#ifdef THREADED_RUNTIME
nextEvent dpy e
#else
nextEvent' dpy e
#endif
ev <- getEvent e
case ev of
ConfigureEvent {} -> atomically $ putTMVar signal Reposition
ExposeEvent {} -> atomically $ putTMVar signal Wakeup
RRScreenChangeNotifyEvent {} -> atomically $ putTMVar signal Reposition
ButtonEvent {} -> atomically $ putTMVar signal (Action (ev_button ev) (fi $ ev_x ev))
_ -> return ()
-- | Send signal to eventLoop every time a var is updated
checker :: TVar [String]
-> [String]
-> [[(Maybe ThreadId, TVar String)]]
-> TMVar SignalType
-> IO ()
checker tvar ov vs signal = do
nval <- atomically $ do
nv <- mapM concatV vs
guard (nv /= ov)
writeTVar tvar nv
return nv
atomically $ putTMVar signal Wakeup
checker tvar nval vs signal
where
concatV = fmap concat . mapM (readTVar . snd)
-- | Continuously wait for a signal from a thread or a interrupt handler
eventLoop :: TVar [String] -> XConf -> [([Action], Position, Position)] -> TMVar SignalType -> IO ()
eventLoop tv xc@(XConf d r w fs is cfg) as signal = do
typ <- atomically $ takeTMVar signal
case typ of
Wakeup -> do
str <- updateString cfg tv
xc' <- updateCache d w is str >>= \c -> return xc { iconS = c }
as' <- updateActions xc r str
runX xc' $ drawInWin r str
eventLoop tv xc' as' signal
Reposition ->
reposWindow cfg
ChangeScreen -> do
ncfg <- updateConfigPosition cfg
reposWindow ncfg
Hide t -> hide (t*100*1000)
Reveal t -> reveal (t*100*1000)
Toggle t -> toggle t
TogglePersistent -> eventLoop
tv xc { config = cfg { persistent = not $ persistent cfg } } as signal
Action but x -> action but x
where
isPersistent = not $ persistent cfg
hide t
| t == 0 =
when isPersistent (hideWindow d w) >> eventLoop tv xc as signal
| otherwise = do
void $ forkIO
$ threadDelay t >> atomically (putTMVar signal $ Hide 0)
eventLoop tv xc as signal
reveal t
| t == 0 = do
when isPersistent (showWindow r cfg d w)
eventLoop tv xc as signal
| otherwise = do
void $ forkIO
$ threadDelay t >> atomically (putTMVar signal $ Reveal 0)
eventLoop tv xc as signal
toggle t = do
ismapped <- isMapped d w
atomically (putTMVar signal $ if ismapped then Hide t else Reveal t)
eventLoop tv xc as signal
reposWindow rcfg = do
r' <- repositionWin d w fs rcfg
eventLoop tv (XConf d r' w fs is rcfg) as signal
updateConfigPosition ocfg =
case position ocfg of
OnScreen n o -> do
srs <- getScreenInfo d
if n == length srs then
return (ocfg {position = OnScreen 1 o})
else
return (ocfg {position = OnScreen (n+1) o})
o ->
return (ocfg {position = OnScreen 1 o})
action button x = do
mapM_ runAction $
filter (\(Spawn b _) -> button `elem` b) $
concatMap (\(a,_,_) -> a) $
filter (\(_, from, to) -> x >= from && x <= to) as
eventLoop tv xc as signal
-- $command
-- | Runs a command as an independent thread and returns its thread id
-- and the TVar the command will be writing to.
startCommand :: TMVar SignalType
-> (Runnable,String,String)
-> IO (Maybe ThreadId, TVar String)
startCommand sig (com,s,ss)
| alias com == "" = do var <- atomically $ newTVar is
atomically $ writeTVar var (s ++ ss)
return (Nothing,var)
| otherwise = do var <- atomically $ newTVar is
let cb str = atomically $ writeTVar var (s ++ str ++ ss)
h <- forkIO $ start com cb
_ <- forkIO $ trigger com
$ maybe (return ()) (atomically . putTMVar sig)
return (Just h,var)
where is = s ++ "Updating..." ++ ss
updateString :: Config -> TVar [String] -> IO [[(Widget, String, Maybe [Action])]]
updateString conf v = do
s <- atomically $ readTVar v
let l:c:r:_ = s ++ repeat ""
io $ mapM (parseString conf) [l, c, r]
updateActions :: XConf -> Rectangle -> [[(Widget, String, Maybe [Action])]] ->
IO [([Action], Position, Position)]
updateActions conf (Rectangle _ _ wid _) ~[left,center,right] = do
let (d,fs) = (display &&& fontS) conf
strLn :: [(Widget, String, Maybe [Action])] -> IO [(Maybe [Action], Position, Position)]
strLn = io . mapM getCoords
iconW i = maybe 0 Bitmap.width (lookup i $ iconS conf)
getCoords (Text s,_,a) = textWidth d fs s >>= \tw -> return (a, 0, fi tw)
getCoords (Icon s,_,a) = return (a, 0, fi $ iconW s)
partCoord off xs = map (\(a, x, x') -> (fromJust a, x, x')) $
filter (\(a, _,_) -> a /= Nothing) $
scanl (\(_,_,x') (a,_,w') -> (a, x', x' + w')) (Nothing, 0, off) xs
totSLen = foldr (\(_,_,len) -> (+) len) 0
remWidth xs = fi wid - totSLen xs
offs = 1
offset a xs = case a of
C -> (remWidth xs + offs) `div` 2
R -> remWidth xs
L -> offs
fmap concat $ mapM (\(a,xs) -> fmap (\xs' -> partCoord (offset a xs') xs') $ strLn xs) $
zip [L,C,R] [left,center,right]
-- $print
-- | Draws in and updates the window
drawInWin :: Rectangle -> [[(Widget, String, Maybe [Action])]] -> X ()
drawInWin (Rectangle _ _ wid ht) ~[left,center,right] = do
r <- ask
let (c,d ) = (config &&& display) r
(w,fs) = (window &&& fontS ) r
strLn = io . mapM getWidth
iconW i = maybe 0 Bitmap.width (lookup i $ iconS r)
getWidth (Text s,cl,_) = textWidth d fs s >>= \tw -> return (Text s,cl,fi tw)
getWidth (Icon s,cl,_) = return (Icon s,cl,fi $ iconW s)
withColors d [bgColor c, borderColor c] $ \[bgcolor, bdcolor] -> do
gc <- io $ createGC d w
-- create a pixmap to write to and fill it with a rectangle
p <- io $ createPixmap d w wid ht
(defaultDepthOfScreen (defaultScreenOfDisplay d))
-- the fgcolor of the rectangle will be the bgcolor of the window
io $ setForeground d gc bgcolor
io $ fillRectangle d p gc 0 0 wid ht
-- write to the pixmap the new string
printStrings p gc fs 1 L =<< strLn left
printStrings p gc fs 1 R =<< strLn right
printStrings p gc fs 1 C =<< strLn center
-- draw 1 pixel border if requested
io $ drawBorder (border c) d p gc bdcolor wid ht
-- copy the pixmap with the new string to the window
io $ copyArea d p w gc 0 0 wid ht 0 0
-- free up everything (we do not want to leak memory!)
io $ freeGC d gc
io $ freePixmap d p
-- resync
io $ sync d True
-- | An easy way to print the stuff we need to print
printStrings :: Drawable -> GC -> XFont -> Position
-> Align -> [(Widget, String, Position)] -> X ()
printStrings _ _ _ _ _ [] = return ()
printStrings dr gc fontst offs a sl@((s,c,l):xs) = do
r <- ask
(as,ds) <- case s of
Text t -> io $ textExtents fontst t
Icon _ -> return (0, 0)
let (conf,d) = (config &&& display) r
Rectangle _ _ wid ht = rect r
totSLen = foldr (\(_,_,len) -> (+) len) 0 sl
valign = -1 + (fi ht + fi (as + ds)) `div` 2
remWidth = fi wid - fi totSLen
offset = case a of
C -> (remWidth + offs) `div` 2
R -> remWidth
L -> offs
(fc,bc) = case break (==',') c of
(f,',':b) -> (f, b )
(f, _) -> (f, bgColor conf)
case s of
(Text t) -> io $ printString d dr fontst gc fc bc offset valign t
(Icon p) -> io $ maybe (return ()) (drawBitmap d dr gc fc bc offset valign) (lookup p (iconS r))
printStrings dr gc fontst (offs + l) a xs