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<title>XMonad/Hooks/ServerMode.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : XMonad.Hooks.ServerMode</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Andrea Rossato and David Roundy 2007</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (see xmonad/LICENSE)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : andrea.rossato@unibz.it</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- This is an 'EventHook' that will receive commands from an external</span>
<a name="line-12"></a><span class='hs-comment'>-- client.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- This is the example of a client:</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- > import Graphics.X11.Xlib</span>
<a name="line-17"></a><span class='hs-comment'>-- > import Graphics.X11.Xlib.Extras</span>
<a name="line-18"></a><span class='hs-comment'>-- > import System.Environment</span>
<a name="line-19"></a><span class='hs-comment'>-- > import Data.Char</span>
<a name="line-20"></a><span class='hs-comment'>-- ></span>
<a name="line-21"></a><span class='hs-comment'>-- > usage :: String -> String</span>
<a name="line-22"></a><span class='hs-comment'>-- > usage n = "Usage: " ++ n ++ " command number\nSend a command number to a running instance of XMonad"</span>
<a name="line-23"></a><span class='hs-comment'>-- ></span>
<a name="line-24"></a><span class='hs-comment'>-- > main :: IO ()</span>
<a name="line-25"></a><span class='hs-comment'>-- > main = do</span>
<a name="line-26"></a><span class='hs-comment'>-- > args <- getArgs</span>
<a name="line-27"></a><span class='hs-comment'>-- > pn <- getProgName</span>
<a name="line-28"></a><span class='hs-comment'>-- > let com = case args of</span>
<a name="line-29"></a><span class='hs-comment'>-- > [] -> error $ usage pn</span>
<a name="line-30"></a><span class='hs-comment'>-- > w -> (w !! 0)</span>
<a name="line-31"></a><span class='hs-comment'>-- > sendCommand com</span>
<a name="line-32"></a><span class='hs-comment'>-- ></span>
<a name="line-33"></a><span class='hs-comment'>-- > sendCommand :: String -> IO ()</span>
<a name="line-34"></a><span class='hs-comment'>-- > sendCommand s = do</span>
<a name="line-35"></a><span class='hs-comment'>-- > d <- openDisplay ""</span>
<a name="line-36"></a><span class='hs-comment'>-- > rw <- rootWindow d $ defaultScreen d</span>
<a name="line-37"></a><span class='hs-comment'>-- > a <- internAtom d "XMONAD_COMMAND" False</span>
<a name="line-38"></a><span class='hs-comment'>-- > allocaXEvent $ \e -> do</span>
<a name="line-39"></a><span class='hs-comment'>-- > setEventType e clientMessage</span>
<a name="line-40"></a><span class='hs-comment'>-- > setClientMessageEvent e rw a 32 (fromIntegral (read s)) currentTime</span>
<a name="line-41"></a><span class='hs-comment'>-- > sendEvent d rw False structureNotifyMask e</span>
<a name="line-42"></a><span class='hs-comment'>-- > sync d False</span>
<a name="line-43"></a><span class='hs-comment'>--</span>
<a name="line-44"></a><span class='hs-comment'>-- compile with: @ghc --make sendCommand.hs@</span>
<a name="line-45"></a><span class='hs-comment'>--</span>
<a name="line-46"></a><span class='hs-comment'>-- run with</span>
<a name="line-47"></a><span class='hs-comment'>--</span>
<a name="line-48"></a><span class='hs-comment'>-- > sendCommand command number</span>
<a name="line-49"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><span class='hs-comment'>-- For instance:</span>
<a name="line-51"></a><span class='hs-comment'>--</span>
<a name="line-52"></a><span class='hs-comment'>-- > sendCommand 0</span>
<a name="line-53"></a><span class='hs-comment'>--</span>
<a name="line-54"></a><span class='hs-comment'>-- will ask to xmonad to print the list of command numbers in</span>
<a name="line-55"></a><span class='hs-comment'>-- stderr (so you can read it in @~\/.xsession-errors@).</span>
<a name="line-56"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Hooks</span><span class='hs-varop'>.</span><span class='hs-conid'>ServerMode</span>
<a name="line-59"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * Usage</span>
<a name="line-60"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-61"></a> <span class='hs-conid'>ServerMode</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>serverModeEventHook</span>
<a name="line-63"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>serverModeEventHook'</span>
<a name="line-64"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-65"></a>
<a name="line-66"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-varid'>when</span><span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span>
<a name="line-68"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-69"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span>
<a name="line-70"></a>
<a name="line-71"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-72"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Actions</span><span class='hs-varop'>.</span><span class='hs-conid'>Commands</span>
<a name="line-73"></a>
<a name="line-74"></a><span class='hs-comment'>-- $usage</span>
<a name="line-75"></a><span class='hs-comment'>-- You can use this module with the following in your</span>
<a name="line-76"></a><span class='hs-comment'>-- @~\/.xmonad\/xmonad.hs@:</span>
<a name="line-77"></a><span class='hs-comment'>--</span>
<a name="line-78"></a><span class='hs-comment'>-- > import XMonad.Hooks.ServerMode</span>
<a name="line-79"></a><span class='hs-comment'>-- > import XMonad.Actions.Commands</span>
<a name="line-80"></a><span class='hs-comment'>--</span>
<a name="line-81"></a><span class='hs-comment'>-- Then edit your @handleEventHook@ by adding the 'serverModeEventHook':</span>
<a name="line-82"></a><span class='hs-comment'>--</span>
<a name="line-83"></a><span class='hs-comment'>-- > main = xmonad defaultConfig { handleEventHook = serverModeEventHook }</span>
<a name="line-84"></a><span class='hs-comment'>--</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="ServerMode"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ServerMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ServerMode</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span> <span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-layout'>)</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="serverModeEventHook"></a><span class='hs-comment'>-- | Executes a command of the list when receiving its index via a special ClientMessageEvent</span>
<a name="line-89"></a><span class='hs-comment'>-- (indexing starts at 1)</span>
<a name="line-90"></a><span class='hs-definition'>serverModeEventHook</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>All</span>
<a name="line-91"></a><span class='hs-definition'>serverModeEventHook</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>serverModeEventHook'</span> <span class='hs-varid'>defaultCommands</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="serverModeEventHook'"></a><span class='hs-comment'>-- | serverModeEventHook' additionally takes an action to generate the list of</span>
<a name="line-94"></a><span class='hs-comment'>-- commands.</span>
<a name="line-95"></a><span class='hs-definition'>serverModeEventHook'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>X</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>X</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Event</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>All</span>
<a name="line-96"></a><span class='hs-definition'>serverModeEventHook'</span> <span class='hs-varid'>cmdAction</span> <span class='hs-layout'>(</span><span class='hs-conid'>ClientMessageEvent</span> <span class='hs-layout'>{</span><span class='hs-varid'>ev_message_type</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mt</span><span class='hs-layout'>,</span> <span class='hs-varid'>ev_data</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dt</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-97"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-varid'>display</span>
<a name="line-98"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>internAtom</span> <span class='hs-varid'>d</span> <span class='hs-str'>"XMONAD_COMMAND"</span> <span class='hs-conid'>False</span>
<a name="line-99"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>mt</span> <span class='hs-varop'>==</span> <span class='hs-varid'>a</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>dt</span> <span class='hs-varop'>/=</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-100"></a> <span class='hs-varid'>cl</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>cmdAction</span>
<a name="line-101"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>listOfCommands</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>uncurry</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Int</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-str'>" - "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fst</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>head</span> <span class='hs-varid'>dt</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>zip</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>1</span><span class='hs-keyglyph'>..</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>cl</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-103"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>action</span>
<a name="line-104"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mapM_</span> <span class='hs-layout'>(</span><span class='hs-varid'>io</span> <span class='hs-varop'>.</span> <span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>stderr</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>listOfCommands</span> <span class='hs-varop'>$</span> <span class='hs-varid'>cl</span>
<a name="line-105"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>All</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
<a name="line-106"></a><span class='hs-definition'>serverModeEventHook'</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>All</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span>
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