haskell - 重启时XMonad确认

Question

我是 Haskell 初学者，我正在使用 xmonad。我试图让它在退出之前提示我，因为我偶尔会不小心点击 mod+q。我找到了两种方法来做到这一点，但我一定是做错了什么，因为它们都不适合我:
https://bbs.archlinux.org/viewtopic.php?id=120298
http://comments.gmane.org/gmane.comp.lang.haskell.xmonad/11699

这是我的 xmonad.hs:

import XMonad
import XMonad.Config.Gnome
import XMonad.Actions.Plane
import XMonad.Util.EZConfig
import XMonad.Util.Run(spawnPipe)
import qualified Data.Map as M
import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks
import XMonad.Hooks.UrgencyHook
import System.IO(Handle, hPutStrLn)
import System.Exit
import Control.Monad
import XMonad
import XMonad.Util.EZConfig
import XMonad.Util.Dmenu
import XMonad.Util.Run

workspaces' = ["1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]

quit_confirm :: X ()
quit_confirm = do
  let m = "confirm restart"
  s <- dmenu [m]
  when (m == s) (spawn "xmonad --restart")

conf_quit = do
  response <- runProcessWithInput "dmenu" ["-p", "Quit?"] "yes\nno\n"
  when (response == "yes") (spawn "xmonad --restart")

main = do
        dzen2Pipe <- spawnPipe "dzen2 -w 1200 -xs 1 -ta l -fn '-*-terminus-*-*-*-*-16-*-*-*-*-*-*-*' -bg black -fg #d3d7cf "
        dzen2Right <- spawnPipe "~/.xmonad/status-dzen.sh"
        startupProgs <- spawnPipe "~/.xmonad/startups.sh"
        xmonad $ defaultConfig
             {
             workspaces = workspaces'
             , manageHook = manageHook' <+> manageHook defaultConfig
             , modMask = mod4Mask
             , terminal = "gnome-terminal"
     , layoutHook = layoutHook'
         , logHook = logHook' dzen2Pipe
             }
            `additionalKeysP`
               [ -- Lock Screen
                ("M-S-l",    spawn "gnome-screensaver-command -l")
                -- Sleep
                , ("M-S-;",   spawn "gnome-screensaver-command -l; pmi action suspend")
                -- wireless
                , ("M-S-C-w", spawn "~/.xmonad/wireless.sh")
                -- 1 screen reconf
                , ("M-S-C-1", spawn "~/.xmonad/1-screen.sh")
                -- 2 screen reconf
                , ("M-S-C-2", spawn "~/.xmonad/2-screen.sh")
                -- confirm for quit
                , ("M-q", conf_quit)
                ]
             `additionalKeys`
             M.toList (planeKeys mod4Mask GConf Finite)

layoutHook' = avoidStruts $ layoutHook defaultConfig

logHook' = dynamicLogWithPP . dzenPP'

dzenPP' h = defaultPP
            {
            ppOutput = hPutStrLn h
            }

manageHook' = composeAll
  [ className =? "Pidgin" --> doShift "1" ,
    className =? "Firefox" --> doShift "2" ,
    className =? "Thunderbird" --> doShift "3" ,
    className =? "OpenOffice.org 3.2" --> doShift "4",
    manageDocks ]

谢谢!

编辑:显示菜单，但生成过程似乎不起作用。

Answer 1

其他人给出的答案错过了dmenu似乎在它返回的字符串末尾添加了一个额外的空格。您只需要执行以下操作，它对我有用:

confirm :: String -> X () -> X ()
confirm m f = do
  result <- dmenu [m]
  when (init result == m) f

然后，正如@mariop 建议的那样使用

confirm "Restart" $ spawn "xmonad --recompile && xmonad --restart"

或者

confirm "Exit" $ io (exitWith ExitSuccess)