> module Config where

xmonad places each window into a "workspace." Each workspace can have any
number of windows, which you can cycle though with mod-j and mod-k. Windows are
either displayed full screen, or tiled. You can toggle the layout mode with
mod-space.

You can switch to workspace N with mod-N. For example, to switch to workspace
5, you would press mod-5. Similarly, you can move the current window to another
workspace with mod-shift-N.

When running with multiple monitors (Xinerama), each screen has exactly 1
workspace visible. When xmonad starts, workspace 1 is on screen 1, workspace 2
is on screen 2, etc. If you switch to a workspace which is currently visible on
another screen, xmonad simply switches focus to that screen. If you switch to a
workspace which is *not* visible, xmonad replaces the workspace on the
*current* screen with the workspace you selected.

For example, if you have the following configuration:

Screen 1: Workspace 2
Screen 2: Workspace 5 (current workspace)

and you wanted to view workspace 7 on screen 1, you would press:

mod-2 (to select workspace 2, and make screen 1 the current screen)
mod-7 (to select workspace 7)

Since switching to the workspace currently visible on a given screen is such a
common operation, shortcuts are provided: mod-{w,e,r} switch to the workspace
currently visible on screens 1, 2, and 3 respectively. Likewise,
shift-mod-{w,e,r} moves the current window to the workspace on that screen.
Using these keys, the above example would become mod-w mod-7.

Some imports we need:

> import Data.Ratio
> import Data.Bits
> import qualified Data.Map as M
> import System.Exit
> import Graphics.X11.Xlib
> import XMonad
> import Operations

The number of workspaces:

> workspaces :: Int
> workspaces = 9

modMask lets you easily change which modkey you use. The default is mod1Mask.
("alt")

> modMask :: KeyMask
> modMask = mod1Mask

The default size for the left pane.

> defaultLeftWidth :: Rational
> defaultLeftWidth = 1%2

How much to change the size of the windows on the left by default.

> defaultDelta :: Rational
> defaultDelta = 3%100

The mask for the numlock key. You may need to change this on some systems.

> numlockMask :: KeySym
> numlockMask = lockMask

The keys list.

> keys :: M.Map (KeyMask, KeySym) (X ())
> keys = M.fromList $
>     [ ((modMask .|. shiftMask, xK_Return), spawn "xterm")
>     , ((modMask,               xK_p     ), spawn "exe=`emenu_path | dmenu` && exec $exe")
>     , ((controlMask,           xK_space ), spawn "gmrun")
>     , ((modMask,               xK_Tab   ), raise GT)
>     , ((modMask,               xK_j     ), raise GT)
>     , ((modMask,               xK_k     ), raise LT)
>     , ((modMask,               xK_h     ), changeWidth (negate defaultDelta))
>     , ((modMask,               xK_l     ), changeWidth defaultDelta)
>     , ((modMask .|. shiftMask, xK_c     ), kill)
>     , ((modMask .|. shiftMask, xK_q     ), io $ exitWith ExitSuccess)
>     , ((modMask .|. shiftMask, xK_F12   ), io restart)
>     , ((modMask,               xK_space ), switchLayout)
>     , ((modMask,               xK_Return), promote)
>     ] ++

Keybindings to each workspace:

>     [((m .|. modMask, xK_0 + fromIntegral i), f i)
>         | i <- [1 .. workspaces]
>         , (f, m) <- [(view, 0), (tag, shiftMask)]]

Keybindings to each screen:

>     ++
>     [((m .|. modMask, key), screenWS sc >>= f)
>         | (key, sc) <- zip [xK_w, xK_e, xK_r] [1..]
>         , (f, m) <- [(view, 0), (tag, shiftMask)]]