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
|
-----------------------------------------------------------------------------
-- |
-- 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 System.IO
import System.Process (runCommand)
import System.Exit
import Graphics.X11.Xlib
import Graphics.X11.Xlib.Extras
import Control.Monad.State
import W
--
-- 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
, windows = [] }
runW initState $ do
root <- io $ rootWindow dpy dflt
io $ do selectInput dpy root (substructureRedirectMask .|. substructureNotifyMask)
sync dpy False
registerKeys dpy root
go dpy
return ()
where
-- The main loop
go dpy = forever $ do
e <- io $ allocaXEvent $ \ev -> nextEvent dpy ev >> getEvent ev
handle e
--
-- | grabkeys. Register key commands
--
registerKeys :: Display -> Window -> W ()
registerKeys dpy root =
forM_ keys $ \(mod, sym, _) -> do
kc <- io (keysymToKeycode dpy sym)
io $ grabKey dpy kc mod root True grabModeAsync grabModeAsync
keys :: [(KeyMask, KeySym, W ())]
keys =
[ (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_q, io $ exitWith ExitSuccess)
]
--
-- The event handler
--
handle :: Event -> W ()
handle (MapRequestEvent {window = w}) = manage w
handle (DestroyWindowEvent {window = w}) = do
ws <- gets windows
when (elem w ws) (unmanage w)
handle (UnmapEvent {window = w}) = do
ws <- gets windows
when (elem w ws) (unmanage w)
handle (KeyEvent {event_type = t, state = mod, keycode = code})
| t == keyPress = do
dpy <- gets display
sym <- io $ keycodeToKeysym dpy code 0
case filter (\(mod', sym', _) -> mod == mod' && sym == sym') keys of
[] -> return ()
((_, _, act):_) -> act
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 _ = return ()
-- ---------------------------------------------------------------------
-- Managing windows
--
-- | refresh. Refresh the currently focused window. Resizes to full
-- screen and raises the window.
--
refresh :: W ()
refresh = do
ws <- gets windows
case ws of
[] -> return ()
(w:_) -> do
d <- gets display
sw <- liftM fromIntegral (gets screenWidth)
sh <- liftM fromIntegral (gets screenHeight)
io $ do moveResizeWindow d w 0 0 sw sh
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
manage :: Window -> W ()
manage w = do
trace "manage"
d <- gets display
withWindows (nub . (w :))
io $ mapWindow d w
-- | unmanage, a window no longer exists, remove it from the stack
unmanage :: Window -> W ()
unmanage w = 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)
-- | spawn. Launch an external application
spawn :: String -> W ()
spawn = io_ . runCommand
|
