Xmonad.hs file: I need a template, but the official one gives errors

Question

I just installed Xmonad and I am LOVING it, but I need some help setting up an xmonad.hs file. I created one in ~/.xmonad/xmonad.hs and looked for a well-commented template since I don't know any Haskell (or any programming language, for that matter). This is the one I copied to the file:
http://www.haskell.org/haskellwiki/Xmon … _xmonad.hs
Which gives:
-- xmonad example config file.
-- A template showing all available configuration hooks,
-- and how to override the defaults in your own xmonad.hs conf file.
-- Normally, you'd only override those defaults you care about.
import XMonad
import System.Exit
import qualified XMonad.StackSet as W
import qualified Data.Map as M
-- The preferred terminal program, which is used in a binding below and by
-- certain contrib modules.
myTerminal = "xterm"
-- Width of the window border in pixels.
myBorderWidth = 1
-- modMask lets you specify which modkey you want to use. The default
-- is mod1Mask ("left alt"). You may also consider using mod3Mask
-- ("right alt"), which does not conflict with emacs keybindings. The
-- "windows key" is usually mod4Mask.
myModMask = mod1Mask
-- The mask for the numlock key. Numlock status is "masked" from the
-- current modifier status, so the keybindings will work with numlock on or
-- off. You may need to change this on some systems.
-- You can find the numlock modifier by running "xmodmap" and looking for a
-- modifier with Num_Lock bound to it:
-- > $ xmodmap | grep Num
-- > mod2 Num_Lock (0x4d)
-- Set numlockMask = 0 if you don't have a numlock key, or want to treat
-- numlock status separately.
myNumlockMask = mod2Mask
-- The default number of workspaces (virtual screens) and their names.
-- By default we use numeric strings, but any string may be used as a
-- workspace name. The number of workspaces is determined by the length
-- of this list.
-- A tagging example:
-- > workspaces = ["web", "irc", "code" ] ++ map show [4..9]
myWorkspaces = ["1","2","3","4","5","6","7","8","9"]
-- Border colors for unfocused and focused windows, respectively.
myNormalBorderColor = "#dddddd"
myFocusedBorderColor = "#ff0000"
-- Default offset of drawable screen boundaries from each physical
-- screen. Anything non-zero here will leave a gap of that many pixels
-- on the given edge, on the that screen. A useful gap at top of screen
-- for a menu bar (e.g. 15)
-- An example, to set a top gap on monitor 1, and a gap on the bottom of
-- monitor 2, you'd use a list of geometries like so:
-- > defaultGaps = [(18,0,0,0),(0,18,0,0)] -- 2 gaps on 2 monitors
-- Fields are: top, bottom, left, right.
myDefaultGaps = [(0,0,0,0)]
-- Key bindings. Add, modify or remove key bindings here.
myKeys conf@(XConfig {XMonad.modMask = modMask}) = M.fromList $
-- launch a terminal
[ ((modMask .|. shiftMask, xK_Return), spawn $ XMonad.terminal conf)
-- launch dmenu
, ((modMask, xK_p ), spawn "exe=`dmenu_path | dmenu` && eval \"exec $exe\"")
-- launch gmrun
, ((modMask .|. shiftMask, xK_p ), spawn "gmrun")
-- close focused window
, ((modMask .|. shiftMask, xK_c ), kill)
-- Rotate through the available layout algorithms
, ((modMask, xK_space ), sendMessage NextLayout)
-- Reset the layouts on the current workspace to default
, ((modMask .|. shiftMask, xK_space ), setLayout $ XMonad.layoutHook conf)
-- Resize viewed windows to the correct size
, ((modMask, xK_n ), refresh)
-- Move focus to the next window
, ((modMask, xK_Tab ), windows W.focusDown)
-- Move focus to the next window
, ((modMask, xK_j ), windows W.focusDown)
-- Move focus to the previous window
, ((modMask, xK_k ), windows W.focusUp )
-- Move focus to the master window
, ((modMask, xK_m ), windows W.focusMaster )
-- Swap the focused window and the master window
, ((modMask, xK_Return), windows W.swapMaster)
-- Swap the focused window with the next window
, ((modMask .|. shiftMask, xK_j ), windows W.swapDown )
-- Swap the focused window with the previous window
, ((modMask .|. shiftMask, xK_k ), windows W.swapUp )
-- Shrink the master area
, ((modMask, xK_h ), sendMessage Shrink)
-- Expand the master area
, ((modMask, xK_l ), sendMessage Expand)
-- Push window back into tiling
, ((modMask, xK_t ), withFocused $ windows . W.sink)
-- Increment the number of windows in the master area
, ((modMask , xK_comma ), sendMessage (IncMasterN 1))
-- Deincrement the number of windows in the master area
, ((modMask , xK_period), sendMessage (IncMasterN (-1)))
-- toggle the status bar gap
, ((modMask , xK_b ),
modifyGap (\i n -> let x = (XMonad.defaultGaps conf ++ repeat (0,0,0,0)) !! i
in if n == x then (0,0,0,0) else x))
-- Quit xmonad
, ((modMask .|. shiftMask, xK_q ), io (exitWith ExitSuccess))
-- Restart xmonad
, ((modMask , xK_q ),
broadcastMessage ReleaseResources >> restart "xmonad" True)
++
-- mod-[1..9], Switch to workspace N
-- mod-shift-[1..9], Move client to workspace N
[((m .|. modMask, k), windows $ f i)
| (i, k) <- zip (XMonad.workspaces conf) [xK_1 .. xK_9]
, (f, m) <- [(W.greedyView, 0), (W.shift, shiftMask)]]
++
-- mod-{w,e,r}, Switch to physical/Xinerama screens 1, 2, or 3
-- mod-shift-{w,e,r}, Move client to screen 1, 2, or 3
[((m .|. modMask, key), screenWorkspace sc >>= flip whenJust (windows . f))
| (key, sc) <- zip [xK_w, xK_e, xK_r] [0..]
, (f, m) <- [(W.view, 0), (W.shift, shiftMask)]]
-- Mouse bindings: default actions bound to mouse events
myMouseBindings (XConfig {XMonad.modMask = modMask}) = M.fromList $
-- mod-button1, Set the window to floating mode and move by dragging
[ ((modMask, button1), (\w -> focus w >> mouseMoveWindow w))
-- mod-button2, Raise the window to the top of the stack
, ((modMask, button2), (\w -> focus w >> windows W.swapMaster))
-- mod-button3, Set the window to floating mode and resize by dragging
, ((modMask, button3), (\w -> focus w >> mouseResizeWindow w))
-- you may also bind events to the mouse scroll wheel (button4 and button5)
-- Layouts:
-- You can specify and transform your layouts by modifying these values.
-- If you change layout bindings be sure to use 'mod-shift-space' after
-- restarting (with 'mod-q') to reset your layout state to the new
-- defaults, as xmonad preserves your old layout settings by default.
-- The available layouts. Note that each layout is separated by |||,
-- which denotes layout choice.
myLayout = tiled ||| Mirror tiled ||| Full
where
-- default tiling algorithm partitions the screen into two panes
tiled = Tall nmaster delta ratio
-- The default number of windows in the master pane
nmaster = 1
-- Default proportion of screen occupied by master pane
ratio = 1/2
-- Percent of screen to increment by when resizing panes
delta = 3/100
-- Window rules:
-- Execute arbitrary actions and WindowSet manipulations when managing
-- a new window. You can use this to, for example, always float a
-- particular program, or have a client always appear on a particular
-- workspace.
-- To find the property name associated with a program, use
-- > xprop | grep WM_CLASS
-- and click on the client you're interested in.
-- To match on the WM_NAME, you can use 'title' in the same way that
-- 'className' and 'resource' are used below.
myManageHook = composeAll
[ className =? "MPlayer" --> doFloat
, className =? "Gimp" --> doFloat
, resource =? "desktop_window" --> doIgnore
, resource =? "kdesktop" --> doIgnore ]
-- Whether focus follows the mouse pointer.
myFocusFollowsMouse :: Bool
myFocusFollowsMouse = True
-- Status bars and logging
-- Perform an arbitrary action on each internal state change or X event.
-- See the 'DynamicLog' extension for examples.
-- To emulate dwm's status bar
-- > logHook = dynamicLogDzen
myLogHook = return ()
-- Now run xmonad with all the defaults we set up.
-- Run xmonad with the settings you specify. No need to modify this.
main = xmonad defaults
-- A structure containing your configuration settings, overriding
-- fields in the default config. Any you don't override, will
-- use the defaults defined in xmonad/XMonad/Config.hs
-- No need to modify this.
defaults = defaultConfig {
-- simple stuff
terminal = myTerminal,
focusFollowsMouse = myFocusFollowsMouse,
borderWidth = myBorderWidth,
modMask = myModMask,
numlockMask = myNumlockMask,
workspaces = myWorkspaces,
normalBorderColor = myNormalBorderColor,
focusedBorderColor = myFocusedBorderColor,
defaultGaps = myDefaultGaps,
-- key bindings
keys = myKeys,
mouseBindings = myMouseBindings,
-- hooks, layouts
layoutHook = myLayout,
manageHook = myManageHook,
logHook = myLogHook
So I copied all this into my new xmonad.hs file and then restarted xmonad with mod+q, but a window popped up giving me this error:
Error detected while loading xmonad configuration file: /home/agi/.xmonad/xmonad.hs
on the commandline:
Warning: -no-recomp is deprecated: Use -fforce-recomp instead
xmonad.hs:141:10: Not in scope: `modifyGap'
xmonad.hs:141:38: Not in scope: `XMonad.defaultGaps'
xmonad.hs:273:8: Not in scope: `defaultGaps'
Please check the file for errors.
I'm not exactly sure what any of this means. If someone could help me decipher this or, better yet, post a better (well-commented so I can understand it) default xmonad.hs file that I can use, that would be great.

Answer 1

Alright! I've got xmonad almost set up! One major thing I still want to do is add some sort of pager-like display in the top left of xmobar. Just to show workspaces 1-9 and highlight the one I'm in (giving a preview of my windows or telling me which ones I have windows in would be great, but not absolutely necessary).
I can't find anything (that I understand) online. Help?
Here's my xmonad.hs:
import XMonad
import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks
import XMonad.Util.Run(spawnPipe)
import XMonad.Util.EZConfig(additionalKeys)
import System.IO
myManageHook = composeAll
[ className =? "Gimp" --> doFloat
main = do
xmproc <- spawnPipe "/path/to/xmobarbinary /home/jgoerzen/.xmobarrc"
-- make sure to edit paths to xmobar and .xmobarrc to match your system.
-- If xmobar is in your $PATH, with config ~/.xmobarrc you don't need the
-- xmobar path or config file, use: xmproc <- spawnPipe "xmobar"
xmonad $ defaultConfig
{ manageHook = manageDocks <+> manageHook defaultConfig
, layoutHook = avoidStruts $ layoutHook defaultConfig
, logHook = dynamicLogWithPP $ xmobarPP
{ ppOutput = hPutStrLn xmproc
, ppTitle = xmobarColor "green" "" . shorten 50
, modMask = mod1Mask
} `additionalKeys`
[ ((mod1Mask .|. shiftMask, xK_z), spawn "xscreensaver-command -lock")
, ((controlMask, xK_Print), spawn "scrot -s")
, ((0, xK_Print), spawn "scrot")
and here's my xmobarrc:
Config { font = "-Misc-Fixed-Bold-R-Normal--13-120-75-75-C-70-ISO8859-1"
, bgColor = "black"
, fgColor = "grey"
, position = TopW L 90
, commands = [ Run Cpu ["-L","3","-H","50","--normal","green","--high","red"] 10
, Run Memory ["-t","Mem: <usedratio>%"] 10
, Run Swap [] 10
, Run Date "%a %b %_d %l:%M" "date" 10
, Run StdinReader
, sepChar = "%"
, alignSep = "}{"
, template = "%StdinReader% }{ %cpu% | %memory% * %swap% <fc=#ee9a00>%date%</fc> |"