summaryrefslogtreecommitdiffstats
path: root/Main.hs
blob: ddcd79e0ab5d37c0499250625445f84963fc4e93 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
-----------------------------------------------------------------------------
-- |
-- 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
--
-- xmonad, a minimalist, tiling window manager for X11
-- 
-----------------------------------------------------------------------------

module Main where

import Data.Bits
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 System.Environment (getArgs)

import Graphics.X11.Xlib hiding (refreshKeyboardMapping)
import Graphics.X11.Xlib.Extras
import Graphics.X11.Xinerama    (getScreenInfo)

import XMonad
import Config
import StackSet (new, floating, member)
import qualified StackSet as W
import Operations

import System.IO

-- |
-- The main entry point
--
main :: IO ()
main = do
    dpy   <- openDisplay ""
    let dflt = defaultScreen dpy
        initcolor c = fst `liftM` allocNamedColor dpy (defaultColormap dpy dflt) c

    rootw  <- rootWindow dpy dflt
    xinesc <- getScreenInfo dpy
    nbc    <- initcolor normalBorderColor
    fbc    <- initcolor focusedBorderColor
    hSetBuffering stdout NoBuffering
    args <- getArgs

    let winset | ("--resume" : s : _) <- args
               , [(x, "")]            <- reads s = x
               | otherwise = new (fromIntegral workspaces) (fromIntegral $ length xinesc)

        safeLayouts = case defaultLayouts of [] -> (full, []); (x:xs) -> (x,xs)
        cf = XConf
            { display       = dpy
            , theRoot       = rootw
            , normalBorder  = nbc
            , focusedBorder = fbc }
        st = XState
            { windowset     = winset
            , layouts       = M.fromList [(w, safeLayouts) | w <- [0 .. W workspaces - 1]]
            , statusGaps    = take (length xinesc) $ defaultGaps ++ repeat (0,0,0,0)
            , xineScreens   = xinesc
            , mapped        = S.empty
            , waitingUnmap  = M.empty }

    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
    grabKeys dpy rootw
    grabButtons dpy rootw

    sync dpy False

    ws <- scan dpy rootw -- on the resume case, will pick up new windows
    allocaXEvent $ \e ->
        runX cf st $ do

            -- walk workspace, resetting X states/mask for windows
            -- TODO, general iterators for these lists.
            sequence_ [ setInitialProperties w >> reveal w
                      | wk <- map W.workspace (W.current winset : W.visible winset)
                      , w  <- W.integrate (W.stack wk) ]

            sequence_ [ setInitialProperties w >> hide w
                      | wk <- W.hidden winset
                      , w  <- W.integrate (W.stack wk) ]

            mapM_ manage ws -- find new windows
            logHook

            -- main loop, for all you HOF/recursion fans out there.
            forever $ handle =<< io (nextEvent dpy e >> getEvent e)

      where forever a = a >> forever a

-- ---------------------------------------------------------------------
-- 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
  where ok w = do wa <- getWindowAttributes dpy w
                  return $ not (wa_override_redirect wa)
                         && wa_map_state wa == waIsViewable

-- | Grab the keys back
grabKeys :: Display -> Window -> IO ()
grabKeys dpy rootw = do
    ungrabKey dpy anyKey anyModifier rootw
    forM_ (M.keys keys) $ \(mask,sym) -> do
         kc <- keysymToKeycode dpy sym
         -- "If the specified KeySym is not defined for any KeyCode,
         -- XKeysymToKeycode() returns zero."
         when (kc /= '\0') $ mapM_ (grab kc . (mask .|.)) extraModifiers

  where grab kc m = grabKey dpy kc m rootw True grabModeAsync grabModeAsync

grabButtons :: Display -> Window -> IO ()
grabButtons dpy rootw = do
    ungrabButton dpy anyButton anyModifier rootw
    mapM_ (\(m,b) -> mapM_ (grab b . (m .|.)) extraModifiers) (M.keys mouseBindings)
  where grab button mask = grabButton dpy button mask rootw False buttonPressMask
                                      grabModeAsync grabModeSync none none

-- ---------------------------------------------------------------------
-- | 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
        whenJust (M.lookup (cleanMask m,s) keys) 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) $ unmanage w

-- 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.adjust pred w (waitingUnmap s) })

-- set keyboard mapping
handle e@(MappingNotifyEvent {ev_window = w}) = do
    io $ refreshKeyboardMapping e
    when (ev_request e == mappingKeyboard) $ withDisplay $ io . flip grabKeys w

-- 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
    if isr then whenJust (M.lookup (cleanMask (ev_state e), b) mouseBindings) ($ ev_subwindow e)
           else focus w
    sendMessage e -- Always send button events.

-- entered a normal window, makes this focused.
handle e@(CrossingEvent {ev_window = w, ev_event_type = t})
    | t == enterNotify && ev_mode   e == notifyNormal
                       && ev_detail e /= notifyInferior = 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

    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 borderWidth
                    , 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

-- the root may have configured
handle (ConfigureEvent {ev_window = w}) = whenX (isRoot w) rescreen

handle e = sendMessage e -- trace (eventName e) -- ignoring