<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://code.haskell.org/~malcolm/hscolour/ -->
<title>XMonad/Hooks/DynamicBars.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<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.DynamicBars</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Ben Boeckel 2012</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD-style (as xmonad)</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : mathstuf@gmail.com</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'>-- Manage per-screen status bars.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-14"></a>
<a name="line-15"></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'>DynamicBars</span> <span class='hs-layout'>(</span>
<a name="line-16"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-17"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-18"></a> <span class='hs-conid'>DynamicStatusBar</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>DynamicStatusBarCleanup</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dynStatusBarStartup</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dynStatusBarEventHook</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>multiPP</span>
<a name="line-23"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-24"></a>
<a name="line-25"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Concurrent</span><span class='hs-varop'>.</span><span class='hs-conid'>MVar</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span>
<a name="line-29"></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-varop'>.</span><span class='hs-conid'>Trans</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span><span class='hs-layout'>)</span>
<a name="line-30"></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-varop'>.</span><span class='hs-conid'>Writer</span> <span class='hs-layout'>(</span><span class='hs-conid'>WriterT</span><span class='hs-layout'>,</span> <span class='hs-varid'>execWriterT</span><span class='hs-layout'>,</span> <span class='hs-varid'>tell</span><span class='hs-layout'>)</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span>
<a name="line-33"></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-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Traversable</span> <span class='hs-layout'>(</span><span class='hs-varid'>traverse</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xinerama</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xlib</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xlib</span><span class='hs-varop'>.</span><span class='hs-conid'>Extras</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Graphics</span><span class='hs-varop'>.</span><span class='hs-conid'>X11</span><span class='hs-varop'>.</span><span class='hs-conid'>Xrandr</span>
<a name="line-40"></a>
<a name="line-41"></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-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-45"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>W</span>
<a name="line-46"></a><span class='hs-keyword'>import</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'>DynamicLog</span>
<a name="line-47"></a>
<a name="line-48"></a><span class='hs-comment'>-- $usage</span>
<a name="line-49"></a><span class='hs-comment'>-- Provides a few helper functions to manage per-screen status bars while</span>
<a name="line-50"></a><span class='hs-comment'>-- dynamically responding to screen changes. A startup action, event hook, and</span>
<a name="line-51"></a><span class='hs-comment'>-- a way to separate PP styles based on the screen's focus are provided:</span>
<a name="line-52"></a><span class='hs-comment'>--</span>
<a name="line-53"></a><span class='hs-comment'>-- * The 'dynStatusBarStartup' hook which initializes the status bars.</span>
<a name="line-54"></a><span class='hs-comment'>--</span>
<a name="line-55"></a><span class='hs-comment'>-- * The 'dynStatusBarEventHook' hook which respawns status bars when the</span>
<a name="line-56"></a><span class='hs-comment'>-- number of screens changes.</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- * The 'multiPP' function which allows for different output based on whether</span>
<a name="line-59"></a><span class='hs-comment'>-- the screen for the status bar has focus.</span>
<a name="line-60"></a><span class='hs-comment'>--</span>
<a name="line-61"></a><span class='hs-comment'>-- The hooks take a 'DynamicStatusBar' function which is given the id of the</span>
<a name="line-62"></a><span class='hs-comment'>-- screen to start up and returns the 'Handle' to the pipe to write to. The</span>
<a name="line-63"></a><span class='hs-comment'>-- 'DynamicStatusBarCleanup' argument should tear down previous instances. It</span>
<a name="line-64"></a><span class='hs-comment'>-- is called when the number of screens changes and on startup.</span>
<a name="line-65"></a><span class='hs-comment'>--</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="DynStatusBarInfo"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>DynStatusBarInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DynStatusBarInfo</span>
<a name="line-68"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>dsbInfoScreens</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ScreenId</span><span class='hs-keyglyph'>]</span>
<a name="line-69"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dsbInfoHandles</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Handle</span><span class='hs-keyglyph'>]</span>
<a name="line-70"></a> <span class='hs-layout'>}</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="DynamicStatusBar"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>DynamicStatusBar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ScreenId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Handle</span>
<a name="line-73"></a><a name="DynamicStatusBarCleanup"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>DynamicStatusBarCleanup</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="statusBarInfo"></a><span class='hs-comment'>-- Global state</span>
<a name="line-76"></a><span class='hs-definition'>statusBarInfo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MVar</span> <span class='hs-conid'>DynStatusBarInfo</span>
<a name="line-77"></a><span class='hs-definition'>statusBarInfo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>newMVar</span> <span class='hs-layout'>(</span><span class='hs-conid'>DynStatusBarInfo</span> <span class='hs-conid'>[]</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="dynStatusBarStartup"></a><span class='hs-definition'>dynStatusBarStartup</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DynamicStatusBar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DynamicStatusBarCleanup</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-80"></a><span class='hs-definition'>dynStatusBarStartup</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>cleanup</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-81"></a> <span class='hs-varid'>dpy</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>openDisplay</span> <span class='hs-str'>""</span>
<a name="line-82"></a> <span class='hs-varid'>xrrSelectInput</span> <span class='hs-varid'>dpy</span> <span class='hs-layout'>(</span><span class='hs-varid'>defaultRootWindow</span> <span class='hs-varid'>dpy</span><span class='hs-layout'>)</span> <span class='hs-varid'>rrScreenChangeNotifyMask</span>
<a name="line-83"></a> <span class='hs-varid'>closeDisplay</span> <span class='hs-varid'>dpy</span>
<a name="line-84"></a> <span class='hs-varid'>updateStatusBars</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>cleanup</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="dynStatusBarEventHook"></a><span class='hs-definition'>dynStatusBarEventHook</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DynamicStatusBar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DynamicStatusBarCleanup</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-87"></a><span class='hs-definition'>dynStatusBarEventHook</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>cleanup</span> <span class='hs-layout'>(</span><span class='hs-conid'>RRScreenChangeNotifyEvent</span> <span class='hs-layout'>{</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-layout'>(</span><span class='hs-varid'>updateStatusBars</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>cleanup</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></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>
<a name="line-88"></a><span class='hs-definition'>dynStatusBarEventHook</span> <span class='hs-keyword'>_</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>
<a name="line-89"></a>
<a name="line-90"></a><a name="updateStatusBars"></a><span class='hs-definition'>updateStatusBars</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>DynamicStatusBar</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>DynamicStatusBarCleanup</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span>
<a name="line-91"></a><span class='hs-definition'>updateStatusBars</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>cleanup</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-92"></a> <span class='hs-varid'>dsbInfo</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>takeMVar</span> <span class='hs-varid'>statusBarInfo</span>
<a name="line-93"></a> <span class='hs-varid'>screens</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getScreens</span>
<a name="line-94"></a> <span class='hs-keyword'>if</span> <span class='hs-layout'>(</span><span class='hs-varid'>screens</span> <span class='hs-varop'>/=</span> <span class='hs-layout'>(</span><span class='hs-varid'>dsbInfoScreens</span> <span class='hs-varid'>dsbInfo</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-96"></a> <span class='hs-varid'>mapM</span> <span class='hs-varid'>hClose</span> <span class='hs-layout'>(</span><span class='hs-varid'>dsbInfoHandles</span> <span class='hs-varid'>dsbInfo</span><span class='hs-layout'>)</span>
<a name="line-97"></a> <span class='hs-varid'>cleanup</span>
<a name="line-98"></a> <span class='hs-varid'>newHandles</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>sb</span> <span class='hs-varid'>screens</span>
<a name="line-99"></a> <span class='hs-varid'>putMVar</span> <span class='hs-varid'>statusBarInfo</span> <span class='hs-layout'>(</span><span class='hs-conid'>DynStatusBarInfo</span> <span class='hs-varid'>screens</span> <span class='hs-varid'>newHandles</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>putMVar</span> <span class='hs-varid'>statusBarInfo</span> <span class='hs-varid'>dsbInfo</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-103"></a><span class='hs-comment'>-- The following code is from adamvo's xmonad.hs file.</span>
<a name="line-104"></a><span class='hs-comment'>-- <a href="http://www.haskell.org/haskellwiki/Xmonad/Config_archive/adamvo%27s_xmonad.hs">http://www.haskell.org/haskellwiki/Xmonad/Config_archive/adamvo%27s_xmonad.hs</a></span>
<a name="line-105"></a>
<a name="line-106"></a><a name="multiPP"></a><span class='hs-definition'>multiPP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>PP</span> <span class='hs-comment'>-- ^ The PP to use if the screen is focused</span>
<a name="line-107"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PP</span> <span class='hs-comment'>-- ^ The PP to use otherwise</span>
<a name="line-108"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-109"></a><span class='hs-definition'>multiPP</span> <span class='hs-varid'>focusPP</span> <span class='hs-varid'>unfocusPP</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-110"></a> <span class='hs-varid'>dsbInfo</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>liftIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readMVar</span> <span class='hs-varid'>statusBarInfo</span>
<a name="line-111"></a> <span class='hs-varid'>multiPP'</span> <span class='hs-varid'>dynamicLogString</span> <span class='hs-varid'>focusPP</span> <span class='hs-varid'>unfocusPP</span> <span class='hs-layout'>(</span><span class='hs-varid'>dsbInfoHandles</span> <span class='hs-varid'>dsbInfo</span><span class='hs-layout'>)</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="multiPP'"></a><span class='hs-definition'>multiPP'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>PP</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>String</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PP</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PP</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Handle</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-114"></a><span class='hs-definition'>multiPP'</span> <span class='hs-varid'>dynlStr</span> <span class='hs-varid'>focusPP</span> <span class='hs-varid'>unfocusPP</span> <span class='hs-varid'>handles</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-115"></a> <span class='hs-varid'>st</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>get</span>
<a name="line-116"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>pickPP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>WorkspaceId</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>WriterT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Last</span> <span class='hs-conid'>XState</span><span class='hs-layout'>)</span> <span class='hs-conid'>X</span> <span class='hs-conid'>String</span>
<a name="line-117"></a> <span class='hs-varid'>pickPP</span> <span class='hs-varid'>ws</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-118"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>isFoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>ws</span> <span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>tag</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>workspace</span> <span class='hs-varop'>.</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>current</span> <span class='hs-varop'>$</span> <span class='hs-varid'>windowset</span> <span class='hs-varid'>st</span>
<a name="line-119"></a> <span class='hs-varid'>put</span> <span class='hs-varid'>st</span><span class='hs-layout'>{</span> <span class='hs-varid'>windowset</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>W</span><span class='hs-varop'>.</span><span class='hs-varid'>view</span> <span class='hs-varid'>ws</span> <span class='hs-varop'>$</span> <span class='hs-varid'>windowset</span> <span class='hs-varid'>st</span> <span class='hs-layout'>}</span>
<a name="line-120"></a> <span class='hs-varid'>out</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dynlStr</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>isFoc</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>focusPP</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>unfocusPP</span>
<a name="line-121"></a> <span class='hs-varid'>when</span> <span class='hs-varid'>isFoc</span> <span class='hs-varop'>$</span> <span class='hs-varid'>get</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>tell</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Last</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span>
<a name="line-122"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>out</span>
<a name="line-123"></a> <span class='hs-varid'>traverse</span> <span class='hs-varid'>put</span> <span class='hs-varop'>.</span> <span class='hs-varid'>getLast</span>
<a name="line-124"></a> <span class='hs-varop'>=<<</span> <span class='hs-varid'>execWriterT</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>io</span> <span class='hs-varop'>.</span> <span class='hs-varid'>zipWithM_</span> <span class='hs-varid'>hPutStrLn</span> <span class='hs-varid'>handles</span> <span class='hs-varop'><=<</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>pickPP</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>catMaybes</span>
<a name="line-125"></a> <span class='hs-varop'>=<<</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>screenWorkspace</span> <span class='hs-layout'>(</span><span class='hs-varid'>zipWith</span> <span class='hs-varid'>const</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span> <span class='hs-keyglyph'>..</span> <span class='hs-keyglyph'>]</span> <span class='hs-varid'>handles</span><span class='hs-layout'>)</span>
<a name="line-126"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="getScreens"></a><span class='hs-definition'>getScreens</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ScreenId</span><span class='hs-keyglyph'>]</span>
<a name="line-129"></a><span class='hs-definition'>getScreens</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-130"></a> <span class='hs-varid'>screens</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span>
<a name="line-131"></a> <span class='hs-varid'>dpy</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>openDisplay</span> <span class='hs-str'>""</span>
<a name="line-132"></a> <span class='hs-varid'>rects</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getScreenInfo</span> <span class='hs-varid'>dpy</span>
<a name="line-133"></a> <span class='hs-varid'>closeDisplay</span> <span class='hs-varid'>dpy</span>
<a name="line-134"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>rects</span>
<a name="line-135"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ids</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>zip</span> <span class='hs-keyglyph'>[</span><span class='hs-num'>0</span> <span class='hs-keyglyph'>..</span> <span class='hs-keyglyph'>]</span> <span class='hs-varid'>screens</span>
<a name="line-136"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fst</span> <span class='hs-varid'>ids</span>
</pre></body>
</html>
