{-# LANGUAGE MultiParamTypeClasses, FlexibleContexts, ForeignFunctionInterface #-}
----------------------------------------------------------------------------
-- |
-- Module : XMonad.Main
-- Copyright : (c) Spencer Janssen 2007
-- License : BSD3-style (see LICENSE)
--
-- Maintainer : sjanssen@cse.unl.edu
-- Stability : unstable
-- Portability : not portable, uses mtl, X11, posix
--
-- xmonad, a minimalist, tiling window manager for X11
--
-----------------------------------------------------------------------------
module XMonad.Main (xmonad) where
import Data.Bits
import Data.List ((\\))
import qualified Data.Map as M
import qualified Data.Set as S
import Control.Monad.Reader
import Control.Monad.State
import Data.Maybe (fromMaybe)
import Foreign.C
import Foreign.Ptr
import System.Environment (getArgs)
import System.Posix.Signals
import Graphics.X11.Xlib hiding (refreshKeyboardMapping)
import Graphics.X11.Xlib.Extras
import XMonad.Core
import qualified XMonad.Config as Default
import XMonad.StackSet (new, floating, member)
import qualified XMonad.StackSet as W
import XMonad.Operations
import System.IO
#include <locale.h>
foreign import ccall unsafe "locale.h setlocale" c_setlocale :: CInt -> Ptr CChar -> IO (Ptr CChar)
-- |
-- The main entry point
--
xmonad :: (LayoutClass l Window, Read (l Window)) => XConfig l -> IO ()
xmonad initxmc = do
-- setup locale information from environment
withCString "" $ \p -> do
c_setlocale (#const LC_ALL) p
-- ignore SIGPIPE
installHandler openEndedPipe Ignore Nothing
-- First, wrap the layout in an existential, to keep things pretty:
let xmc = initxmc { layoutHook = Layout $ layoutHook initxmc }
dpy <- openDisplay ""
let dflt = defaultScreen dpy
rootw <- rootWindow dpy dflt
xinesc <- getCleanedScreenInfo dpy
nbc <- do v <- initColor dpy $ normalBorderColor xmc
~(Just nbc_) <- initColor dpy $ normalBorderColor Default.defaultConfig
return (fromMaybe nbc_ v)
fbc <- do v <- initColor dpy $ focusedBorderColor xmc
~(Just fbc_) <- initColor dpy $ focusedBorderColor Default.defaultConfig
return (fromMaybe fbc_ v)
hSetBuffering stdout NoBuffering
args <- getArgs
let layout = layoutHook xmc
lreads = readsLayout layout
initialWinset = new layout (workspaces xmc) $ map SD xinesc
maybeRead reads' s = case reads' s of
[(x, "")] -> Just x
_ -> Nothing
winset = fromMaybe initialWinset $ do
("--resume" : s : _) <- return args
ws <- maybeRead reads s
return . W.ensureTags layout (workspaces xmc)
$ W.mapLayout (fromMaybe layout . maybeRead lreads) ws
cf = XConf
{ display = dpy
, config = xmc
, theRoot = rootw
, normalBorder = nbc
, focusedBorder = fbc
, keyActions = keys xmc xmc
, buttonActions = mouseBindings xmc xmc }
st = XState
{ windowset = initialWinset
, mapped = S.empty
, waitingUnmap = M.empty
, dragging = Nothing }
xSetErrorHandler -- in C, I'm too lazy to write the binding: dons
-- setup initial X environment
sync dpy False
selectInput dpy rootw $ substructureRedirectMask .|. substructureNotifyMask
.|. enterWindowMask .|. leaveWindowMask .|. structureNotifyMask
allocaXEvent $ \e ->
runX cf st $ do
grabKeys
grabButtons
io $ sync dpy False
ws <- io $ scan dpy rootw
-- bootstrap the windowset, Operations.windows will identify all
-- the windows in winset as new and set initial properties for
-- those windows. Remove all windows that are no longer top-level
-- children of the root, they may have disappeared since
-- restarting.
windows . const . foldr W.delete winset $ W.allWindows winset \\ ws
-- manage the as-yet-unmanaged windows
mapM_ manage (ws \\ W.allWindows winset)
userCode $ startupHook initxmc
-- main loop, for all you HOF/recursion fans out there.
forever_ $ handle =<< io (nextEvent dpy e >> getEvent e)
return ()
where forever_ a = a >> forever_ a
-- ---------------------------------------------------------------------
-- | Event handler. Map X events onto calls into Operations.hs, which
-- modify our internal model of the window manager state.
--
-- Events dwm handles that we don't:
--
-- [ButtonPress] = buttonpress,
-- [Expose] = expose,
-- [PropertyNotify] = propertynotify,
--
handle :: Event -> X ()
-- run window manager command
handle (KeyEvent {ev_event_type = t, ev_state = m, ev_keycode = code})
| t == keyPress = withDisplay $ \dpy -> do
s <- io $ keycodeToKeysym dpy code 0
mClean <- cleanMask m
ks <- asks keyActions
userCode $ whenJust (M.lookup (mClean, s) ks) id
-- manage a new window
handle (MapRequestEvent {ev_window = w}) = withDisplay $ \dpy -> do
wa <- io $ getWindowAttributes dpy w -- ignore override windows
-- need to ignore mapping requests by managed windows not on the current workspace
managed <- isClient w
when (not (wa_override_redirect wa) && not managed) $ do manage w
-- window destroyed, unmanage it
-- window gone, unmanage it
handle (DestroyWindowEvent {ev_window = w}) = whenX (isClient w) $ do
unmanage w
modify (\s -> s { mapped = S.delete w (mapped s)
, waitingUnmap = M.delete w (waitingUnmap s)})
-- We track expected unmap events in waitingUnmap. We ignore this event unless
-- it is synthetic or we are not expecting an unmap notification from a window.
handle (UnmapEvent {ev_window = w, ev_send_event = synthetic}) = whenX (isClient w) $ do
e <- gets (fromMaybe 0 . M.lookup w . waitingUnmap)
if (synthetic || e == 0)
then unmanage w
else modify (\s -> s { waitingUnmap = M.update mpred w (waitingUnmap s) })
where mpred 1 = Nothing
mpred n = Just $ pred n
-- set keyboard mapping
handle e@(MappingNotifyEvent {}) = do
io $ refreshKeyboardMapping e
when (ev_request e == mappingKeyboard) grabKeys
-- handle button release, which may finish dragging.
handle e@(ButtonEvent {ev_event_type = t})
| t == buttonRelease = do
drag <- gets dragging
case drag of
-- we're done dragging and have released the mouse:
Just (_,f) -> modify (\s -> s { dragging = Nothing }) >> f
Nothing -> broadcastMessage e
-- handle motionNotify event, which may mean we are dragging.
handle e@(MotionEvent {ev_event_type = _t, ev_x = x, ev_y = y}) = do
drag <- gets dragging
case drag of
Just (d,_) -> d (fromIntegral x) (fromIntegral y) -- we're dragging
Nothing -> broadcastMessage e
-- click on an unfocused window, makes it focused on this workspace
handle e@(ButtonEvent {ev_window = w,ev_event_type = t,ev_button = b })
| t == buttonPress = do
-- If it's the root window, then it's something we
-- grabbed in grabButtons. Otherwise, it's click-to-focus.
isr <- isRoot w
m <- cleanMask $ ev_state e
ba <- asks buttonActions
if isr then userCode $ whenJust (M.lookup (m, b) ba) ($ ev_subwindow e)
else focus w
broadcastMessage e -- Always send button events.
-- entered a normal window: focus it if focusFollowsMouse is set to
-- True in the user's config.
handle e@(CrossingEvent {ev_window = w, ev_event_type = t})
| t == enterNotify && ev_mode e == notifyNormal
&& ev_detail e /= notifyInferior
= whenX (asks $ focusFollowsMouse . config) (focus w)
-- left a window, check if we need to focus root
handle e@(CrossingEvent {ev_event_type = t})
| t == leaveNotify
= do rootw <- asks theRoot
when (ev_window e == rootw && not (ev_same_screen e)) $ setFocusX rootw
-- configure a window
handle e@(ConfigureRequestEvent {ev_window = w}) = withDisplay $ \dpy -> do
ws <- gets windowset
wa <- io $ getWindowAttributes dpy w
bw <- asks (borderWidth . config)
if M.member w (floating ws)
|| not (member w ws)
then do io $ configureWindow dpy w (ev_value_mask e) $ WindowChanges
{ wc_x = ev_x e
, wc_y = ev_y e
, wc_width = ev_width e
, wc_height = ev_height e
, wc_border_width = fromIntegral bw
, wc_sibling = ev_above e
, wc_stack_mode = ev_detail e }
when (member w ws) (float w)
else io $ allocaXEvent $ \ev -> do
setEventType ev configureNotify
setConfigureEvent ev w w
(wa_x wa) (wa_y wa) (wa_width wa)
(wa_height wa) (ev_border_width e) none (wa_override_redirect wa)
sendEvent dpy w False 0 ev
io $ sync dpy False
-- configuration changes in the root may mean display settings have changed
handle (ConfigureEvent {ev_window = w}) = whenX (isRoot w) rescreen
-- property notify
handle PropertyEvent { ev_event_type = t, ev_atom = a }
| t == propertyNotify && a == wM_NAME = userCode =<< asks (logHook . config)
handle e = broadcastMessage e -- trace (eventName e) -- ignoring
-- ---------------------------------------------------------------------
-- IO stuff. Doesn't require any X state
-- Most of these things run only on startup (bar grabkeys)
-- | scan for any new windows to manage. If they're already managed,
-- this should be idempotent.
scan :: Display -> Window -> IO [Window]
scan dpy rootw = do
(_, _, ws) <- queryTree dpy rootw
filterM ok ws
-- TODO: scan for windows that are either 'IsViewable' or where WM_STATE ==
-- Iconic
where ok w = do wa <- getWindowAttributes dpy w
a <- internAtom dpy "WM_STATE" False
p <- getWindowProperty32 dpy a w
let ic = case p of
Just (3:_) -> True -- 3 for iconified
_ -> False
return $ not (wa_override_redirect wa)
&& (wa_map_state wa == waIsViewable || ic)
-- | Grab the keys back
grabKeys :: X ()
grabKeys = do
XConf { display = dpy, theRoot = rootw } <- ask
let grab kc m = io $ grabKey dpy kc m rootw True grabModeAsync grabModeAsync
io $ ungrabKey dpy anyKey anyModifier rootw
ks <- asks keyActions
forM_ (M.keys ks) $ \(mask,sym) -> do
kc <- io $ keysymToKeycode dpy sym
-- "If the specified KeySym is not defined for any KeyCode,
-- XKeysymToKeycode() returns zero."
when (kc /= '\0') $ mapM_ (grab kc . (mask .|.)) =<< extraModifiers
-- | XXX comment me
grabButtons :: X ()
grabButtons = do
XConf { display = dpy, theRoot = rootw } <- ask
let grab button mask = io $ grabButton dpy button mask rootw False buttonPressMask
grabModeAsync grabModeSync none none
io $ ungrabButton dpy anyButton anyModifier rootw
ems <- extraModifiers
ba <- asks buttonActions
mapM_ (\(m,b) -> mapM_ (grab b . (m .|.)) ems) (M.keys $ ba)