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|
-----------------------------------------------------------------------------
-- |
-- Module : Main.hs
-- Copyright : (c) Spencer Janssen 2007
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : sjanssen@cse.unl.edu
-- Stability : unstable
-- Portability : not portable, uses mtl, X11, posix
--
-----------------------------------------------------------------------------
--
-- thunk, a minimal window manager for X11
--
import Data.Bits hiding (rotate)
import Data.List
import qualified Data.Sequence as S
import qualified Data.Foldable as F
import qualified Data.Map as M
import System.IO
import System.Process (runCommand)
import System.Exit
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import Control.Monad.State
import W
--
-- The number of workspaces:
--
workspaces :: Int
workspaces = 5
--
-- The keys list
--
keys :: M.Map (KeyMask, KeySym) (W ())
keys = M.fromList $
[ ((mod1Mask .|. shiftMask, xK_Return), spawn "xterm")
, ((mod1Mask, xK_p ), spawn "exe=`dmenu_path | dmenu` && exec $exe")
, ((controlMask, xK_space ), spawn "gmrun")
, ((mod1Mask, xK_Tab ), focus 1)
, ((mod1Mask, xK_j ), focus 1)
, ((mod1Mask, xK_k ), focus (-1))
, ((mod1Mask .|. shiftMask, xK_c ), kill)
, ((mod1Mask .|. shiftMask, xK_q ), io $ exitWith ExitSuccess)
] ++
-- generate keybindings for each workspace:
[((m .|. mod1Mask, xK_0 + fromIntegral i), f i)
| i <- [1 .. workspaces]
, (f, m) <- [(view, 0), (tag, shiftMask)]]
--
-- let's get underway
--
main :: IO ()
main = do
dpy <- openDisplay ""
let dflt = defaultScreen dpy
initState = WState
{ display = dpy
, screenWidth = displayWidth dpy dflt
, screenHeight = displayHeight dpy dflt
, workspace = (0,S.fromList (replicate workspaces [])) -- empty workspaces
}
runW initState $ do
r <- io $ rootWindow dpy dflt
io $ do selectInput dpy r (substructureRedirectMask .|. substructureNotifyMask)
sync dpy False
registerKeys dpy r
(_, _, ws) <- io $ queryTree dpy r
forM_ ws $ \w -> do
wa <- io $ getWindowAttributes dpy w
when (waMapState wa == waIsViewable) (manage w)
go dpy
return ()
where
-- The main loop
go dpy = forever $ do
e <- io $ allocaXEvent $ \ev -> nextEvent dpy ev >> getEvent ev
handle e
-- register keys
registerKeys dpy r = forM_ (M.keys keys) $ \(m,s) -> io $ do
kc <- keysymToKeycode dpy s
grabKey dpy kc m r True grabModeAsync grabModeAsync
--
-- | handle. Handle X events
--
handle :: Event -> W ()
handle (MapRequestEvent {window = w}) = manage w
handle (DestroyWindowEvent {window = w}) = unmanage w
handle (UnmapEvent {window = w}) = unmanage w
handle (KeyEvent {event_type = t, state = m, keycode = code})
| t == keyPress = do
dpy <- gets display
s <- io $ keycodeToKeysym dpy code 0
case M.lookup (m,s) keys of
Nothing -> return ()
Just a -> a
handle e@(ConfigureRequestEvent {}) = do
dpy <- gets display
io $ configureWindow dpy (window e) (value_mask e) $ WindowChanges
{ wcX = x e
, wcY = y e
, wcWidth = width e
, wcHeight = height e
, wcBorderWidth = border_width e
, wcSibling = above e
, wcStackMode = detail e
}
io $ sync dpy False
handle e = trace (eventName e) -- return ()
-- ---------------------------------------------------------------------
-- Managing windows
-- | spawn. Launch an external application
spawn :: String -> W ()
spawn = io_ . runCommand
--
-- | refresh. Refresh the currently focused window. Resizes to full
-- screen and raises the window.
--
refresh :: W ()
refresh = do
(n,wks) <- gets workspace
let ws = wks `S.index` n
case ws of
[] -> return () -- do nothing. hmm. so no empty workspaces?
-- we really need to hide all non-visible windows
-- ones on other screens
(w:_) -> do
d <- gets display
sw <- liftM fromIntegral (gets screenWidth)
sh <- liftM fromIntegral (gets screenHeight)
io $ do moveResizeWindow d w 0 0 sw sh -- fullscreen
raiseWindow d w
-- | Modify the current window list with a pure funtion, and refresh
withWindows :: (Windows -> Windows) -> W ()
withWindows f = do
modifyWindows f
refresh
-- | manage. Add a new window to be managed in the current workspace. Bring it into focus.
manage :: Window -> W ()
manage w = do
d <- gets display
io $ mapWindow d w
withWindows (nub . (w :))
-- | unmanage. A window no longer exists, remove it from the window
-- list, on whatever workspace it is.
unmanage :: Window -> W ()
unmanage w = do
(_,wks) <- gets workspace
mapM_ rm (F.toList wks)
where
rm ws = when (w `elem` ws) $ do
dpy <- gets display
io $ do grabServer dpy
sync dpy False
ungrabServer dpy
withWindows $ filter (/= w)
-- | focus. focus to window at offset 'n' in list.
-- The currently focused window is always the head of the list
focus :: Int -> W ()
focus n = withWindows (rotate n)
-- | Kill the currently focused client
kill :: W ()
kill = do
dpy <- gets display
(n,wks) <- gets workspace
let ws = wks `S.index` n
case ws of
[] -> return ()
(w:_) -> do
-- if(isprotodel(sel))
-- sendevent(sel->win, wmatom[WMProtocols], wmatom[WMDelete]);
io $ killClient dpy w -- ignoring result
return ()
-- | tag. associate a window with a new workspace
tag :: Int -> W ()
tag n = do
let new = n-1
(old,wks) <- gets workspace
when (new /= old && new >= 0 && new < S.length wks) $ do
let this = wks `S.index` old
if null this
then return () -- no client to retag
else do let (t:_) = this
modifyWorkspaces $ \(i,w) ->
let w' = S.adjust tail old w
w'' = S.adjust (t:) new w' in (i,w'')
hideWindows [t]
refresh
-- | Change the current workspace to workspce at offset 'n-1'.
view :: Int -> W ()
view n = do
let new = n-1
(old,wks) <- gets workspace
when (new /= old && new >= 0 && new < S.length wks) $ do
modifyWorkspaces $ \_ -> (new,wks)
hideWindows (wks `S.index` old)
showWindows (wks `S.index` new)
refresh
-- | Hide a list of windows by moving them offscreen.
hideWindows :: Windows -> W ()
hideWindows ws = do
dpy <- gets display
sw <- liftM fromIntegral (gets screenWidth)
sh <- liftM fromIntegral (gets screenHeight)
forM_ ws $ \w -> io $ moveWindow dpy w (2*sw) (2*sh)
-- | Expose a list of windows, moving them on screen
showWindows :: Windows -> W ()
showWindows ws = do
dpy <- gets display
forM_ ws $ \w -> io $ moveWindow dpy w 0 0
|
