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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable, ExistentialQuantification, Rank2Types, MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, FlexibleContexts, PatternGuards #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-4"></a><span class='hs-comment'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : XMonad.Layout.MultiToggle</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) Lukas Mai</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : <l.mai@web.de></span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Dynamically apply and unapply transformers to your window layout. This can</span>
<a name="line-14"></a><span class='hs-comment'>-- be used to rotate your window layout by 90 degrees, or to make the</span>
<a name="line-15"></a><span class='hs-comment'>-- currently focused window occupy the whole screen (\"zoom in\") then undo</span>
<a name="line-16"></a><span class='hs-comment'>-- the transformation (\"zoom out\").</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>Layout</span><span class='hs-varop'>.</span><span class='hs-conid'>MultiToggle</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-20"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-21"></a> <span class='hs-conid'>Transformer</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-conid'>Toggle</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-layout'>(</span><span class='hs-varop'>??</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-conid'>EOT</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-varid'>single</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>mkToggle</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>mkToggle1</span><span class='hs-layout'>,</span>
<a name="line-28"></a>
<a name="line-29"></a> <span class='hs-conid'>HList</span><span class='hs-layout'>,</span>
<a name="line-30"></a> <span class='hs-conid'>HCons</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-conid'>MultiToggle</span><span class='hs-layout'>,</span>
<a name="line-32"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-varop'>.</span><span class='hs-conid'>StackSet</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span>
<a name="line-40"></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-41"></a>
<a name="line-42"></a><span class='hs-comment'>-- $usage</span>
<a name="line-43"></a><span class='hs-comment'>-- The basic idea is to have a base layout and a set of layout transformers,</span>
<a name="line-44"></a><span class='hs-comment'>-- of which at most one is active at any time. Enabling another transformer</span>
<a name="line-45"></a><span class='hs-comment'>-- first disables any currently active transformer; i.e. it works like a</span>
<a name="line-46"></a><span class='hs-comment'>-- group of radio buttons.</span>
<a name="line-47"></a><span class='hs-comment'>--</span>
<a name="line-48"></a><span class='hs-comment'>-- To use this module, you need some data types which represent</span>
<a name="line-49"></a><span class='hs-comment'>-- transformers; for some commonly used transformers (including</span>
<a name="line-50"></a><span class='hs-comment'>-- MIRROR, NOBORDERS, and FULL used in the examples below) you can</span>
<a name="line-51"></a><span class='hs-comment'>-- simply import "XMonad.Layout.MultiToggle.Instances".</span>
<a name="line-52"></a><span class='hs-comment'>--</span>
<a name="line-53"></a><span class='hs-comment'>-- Somewhere else in your file you probably have a definition of @layout@;</span>
<a name="line-54"></a><span class='hs-comment'>-- the default looks like this:</span>
<a name="line-55"></a><span class='hs-comment'>--</span>
<a name="line-56"></a><span class='hs-comment'>-- > layout = tiled ||| Mirror tiled ||| Full</span>
<a name="line-57"></a><span class='hs-comment'>--</span>
<a name="line-58"></a><span class='hs-comment'>-- After changing this to</span>
<a name="line-59"></a><span class='hs-comment'>--</span>
<a name="line-60"></a><span class='hs-comment'>-- > layout = mkToggle (single MIRROR) (tiled ||| Full)</span>
<a name="line-61"></a><span class='hs-comment'>--</span>
<a name="line-62"></a><span class='hs-comment'>-- you can now dynamically apply the 'XMonad.Layout.Mirror' transformation:</span>
<a name="line-63"></a><span class='hs-comment'>--</span>
<a name="line-64"></a><span class='hs-comment'>-- > ...</span>
<a name="line-65"></a><span class='hs-comment'>-- > , ((modm, xK_x ), sendMessage $ Toggle MIRROR)</span>
<a name="line-66"></a><span class='hs-comment'>-- > ...</span>
<a name="line-67"></a><span class='hs-comment'>--</span>
<a name="line-68"></a><span class='hs-comment'>-- (That should be part of your key bindings.) When you press @mod-x@, the</span>
<a name="line-69"></a><span class='hs-comment'>-- active layout is mirrored. Another @mod-x@ and it's back to normal.</span>
<a name="line-70"></a><span class='hs-comment'>--</span>
<a name="line-71"></a><span class='hs-comment'>-- It's also possible to stack @MultiToggle@s. For example:</span>
<a name="line-72"></a><span class='hs-comment'>--</span>
<a name="line-73"></a><span class='hs-comment'>-- @</span>
<a name="line-74"></a><span class='hs-comment'>-- layout = id</span>
<a name="line-75"></a><span class='hs-comment'>-- . 'XMonad.Layout.NoBorders.smartBorders'</span>
<a name="line-76"></a><span class='hs-comment'>-- . mkToggle (NOBORDERS ?? FULL ?? EOT)</span>
<a name="line-77"></a><span class='hs-comment'>-- . mkToggle (single MIRROR)</span>
<a name="line-78"></a><span class='hs-comment'>-- $ tiled ||| 'XMonad.Layout.Grid.Grid' ||| 'XMonad.Layout.Circle.Circle'</span>
<a name="line-79"></a><span class='hs-comment'>-- @</span>
<a name="line-80"></a><span class='hs-comment'>--</span>
<a name="line-81"></a><span class='hs-comment'>-- By binding a key to @(sendMessage $ Toggle FULL)@ you can temporarily</span>
<a name="line-82"></a><span class='hs-comment'>-- maximize windows, in addition to being able to rotate layouts and remove</span>
<a name="line-83"></a><span class='hs-comment'>-- window borders.</span>
<a name="line-84"></a><span class='hs-comment'>--</span>
<a name="line-85"></a><span class='hs-comment'>-- You can also define your own transformers by creating a data type</span>
<a name="line-86"></a><span class='hs-comment'>-- which is an instance of the 'Transformer' class. For example, here</span>
<a name="line-87"></a><span class='hs-comment'>-- is the definition of @MIRROR@:</span>
<a name="line-88"></a><span class='hs-comment'>--</span>
<a name="line-89"></a><span class='hs-comment'>-- > data MIRROR = MIRROR deriving (Read, Show, Eq, Typeable)</span>
<a name="line-90"></a><span class='hs-comment'>-- > instance Transformer MIRROR Window where</span>
<a name="line-91"></a><span class='hs-comment'>-- > transform _ x k = k (Mirror x) (\(Mirror x') -> x')</span>
<a name="line-92"></a><span class='hs-comment'>--</span>
<a name="line-93"></a><span class='hs-comment'>-- Note, you need to put @{-\# LANGUAGE DeriveDataTypeable \#-}@ at the</span>
<a name="line-94"></a><span class='hs-comment'>-- beginning of your file.</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="Transformer"></a><span class='hs-comment'>-- | A class to identify custom transformers (and look up transforming</span>
<a name="line-97"></a><a name="Transformer"></a><span class='hs-comment'>-- functions by type).</span>
<a name="line-98"></a><a name="Transformer"></a><span class='hs-keyword'>class</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>t</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Transformer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-99"></a> <span class='hs-varid'>transform</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span>
<a name="line-100"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>l'</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l'</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>l'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="EL"></a><span class='hs-keyword'>data</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>l'</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l'</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EL</span> <span class='hs-layout'>(</span><span class='hs-varid'>l'</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="unEL"></a><span class='hs-definition'>unEL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>l'</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l'</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>l'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-105"></a><span class='hs-definition'>unEL</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-varid'>x</span>
<a name="line-106"></a>
<a name="line-107"></a><a name="deEL"></a><span class='hs-definition'>deEL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-108"></a><span class='hs-definition'>deEL</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-varid'>x</span> <span class='hs-varid'>det</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>det</span> <span class='hs-varid'>x</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="transform'"></a><span class='hs-definition'>transform'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Transformer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-111"></a><span class='hs-definition'>transform'</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>det</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>transform</span> <span class='hs-varid'>t</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>l'</span> <span class='hs-varid'>det'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l'</span> <span class='hs-layout'>(</span><span class='hs-varid'>det</span> <span class='hs-varop'>.</span> <span class='hs-varid'>det'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-112"></a>
<a name="line-113"></a><a name="Toggle"></a><span class='hs-comment'>-- | Toggle the specified layout transformer.</span>
<a name="line-114"></a><a name="Toggle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Toggle</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>t</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Transformer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Toggle</span> <span class='hs-varid'>t</span>
<a name="line-115"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="instance%20Message%20(Toggle%20a)%20data%20MultiToggleS%20ts%20l%20a%20=%20MultiToggleS%20(l%20a)%20(Maybe%20Int)%20ts%20deriving%20(Read,%20Show)%20data%20MultiToggle%20ts%20l%20a%20=%20MultiToggle%7b%20currLayout%20::%20EL%20l%20a,%20currIndex%20::%20Maybe%20Int,%20transformers%20::%20ts%20%7d%20expand%20::%20(LayoutClass%20l%20a,%20HList%20ts%20a)%20=%3e%20MultiToggleS%20ts%20l%20a%20-%3e%20MultiToggle%20ts%20l%20a%20expand%20(MultiToggleS%20b%20i%20ts)%20=%20resolve%20ts%20(fromMaybe%20(-1)%20i)%20id%20(%5cx%20mt%20-%3e%20let%20g%20=%20transform'%20x%20in%20mt%7b%20currLayout%20=%20g%20$%20currLayout%20mt%20%7d%20)%20(MultiToggle%20(EL%20b%20id)%20i%20ts)%20collapse%20::%20(LayoutClass%20l%20a)%20=%3e%20MultiToggle%20ts%20l%20a%20-%3e%20MultiToggleS%20ts%20l%20a%20collapse%20mt%20=%20MultiToggleS%20(deEL%20(currLayout%20mt))%20(currIndex%20mt)%20(transformers%20mt)%20instance%20(LayoutClass%20l%20a,%20Read%20(l%20a),%20HList%20ts%20a,%20Read%20ts)%20=%3e%20Read%20(MultiToggle%20ts%20l%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Message</span> <span class='hs-layout'>(</span><span class='hs-conid'>Toggle</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-118"></a>
<a name="line-119"></a><a name="MultiToggleS"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>MultiToggleS</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiToggleS</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-varid'>ts</span>
<a name="line-120"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-121"></a>
<a name="line-122"></a><a name="MultiToggle"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiToggle</span><span class='hs-layout'>{</span>
<a name="line-123"></a> <span class='hs-varid'>currLayout</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span>
<a name="line-124"></a> <span class='hs-varid'>currIndex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span>
<a name="line-125"></a> <span class='hs-varid'>transformers</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>ts</span>
<a name="line-126"></a><span class='hs-layout'>}</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="expand"></a><span class='hs-definition'>expand</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>HList</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MultiToggleS</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-129"></a><span class='hs-definition'>expand</span> <span class='hs-layout'>(</span><span class='hs-conid'>MultiToggleS</span> <span class='hs-varid'>b</span> <span class='hs-varid'>i</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-130"></a> <span class='hs-varid'>resolve</span> <span class='hs-varid'>ts</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span>
<a name="line-131"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-varid'>mt</span> <span class='hs-keyglyph'>-></span>
<a name="line-132"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>transform'</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>mt</span><span class='hs-layout'>{</span> <span class='hs-varid'>currLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>g</span> <span class='hs-varop'>$</span> <span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span> <span class='hs-layout'>}</span>
<a name="line-133"></a> <span class='hs-layout'>)</span>
<a name="line-134"></a> <span class='hs-layout'>(</span><span class='hs-conid'>MultiToggle</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-varid'>b</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span>
<a name="line-135"></a>
<a name="line-136"></a><a name="collapse"></a><span class='hs-definition'>collapse</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MultiToggleS</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-137"></a><span class='hs-definition'>collapse</span> <span class='hs-varid'>mt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiToggleS</span> <span class='hs-layout'>(</span><span class='hs-varid'>deEL</span> <span class='hs-layout'>(</span><span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>currIndex</span> <span class='hs-varid'>mt</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>transformers</span> <span class='hs-varid'>mt</span><span class='hs-layout'>)</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="instance%20Read%20(MultiToggle%20ts%20l%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>HList</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Read</span> <span class='hs-layout'>(</span><span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-140"></a> <span class='hs-varid'>readsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>first</span> <span class='hs-varid'>expand</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>readsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span>
<a name="line-141"></a>
<a name="line-142"></a><a name="instance%20Show%20(MultiToggle%20ts%20l%20a)"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>ts</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Show</span> <span class='hs-layout'>(</span><span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-143"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>p</span> <span class='hs-varop'>.</span> <span class='hs-varid'>collapse</span>
<a name="line-144"></a>
<a name="line-145"></a><a name="mkToggle"></a><span class='hs-comment'>-- | Construct a @MultiToggle@ layout from a transformer table and a base</span>
<a name="line-146"></a><span class='hs-comment'>-- layout.</span>
<a name="line-147"></a><span class='hs-definition'>mkToggle</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-148"></a><span class='hs-definition'>mkToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>MultiToggle</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>ts</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="mkToggle1"></a><span class='hs-comment'>-- | Construct a @MultiToggle@ layout from a single transformer and a base</span>
<a name="line-151"></a><span class='hs-comment'>-- layout.</span>
<a name="line-152"></a><span class='hs-definition'>mkToggle1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>MultiToggle</span> <span class='hs-layout'>(</span><span class='hs-conid'>HCons</span> <span class='hs-varid'>t</span> <span class='hs-conid'>EOT</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span>
<a name="line-153"></a><span class='hs-definition'>mkToggle1</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mkToggle</span> <span class='hs-layout'>(</span><span class='hs-varid'>single</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-154"></a>
<a name="line-155"></a><a name="EOT"></a><span class='hs-comment'>-- | Marks the end of a transformer list.</span>
<a name="line-156"></a><a name="EOT"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>EOT</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EOT</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-157"></a><a name="HCons"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>HCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>HCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Read</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-158"></a>
<a name="line-159"></a><span class='hs-keyword'>infixr</span> <span class='hs-num'>0</span> <span class='hs-varop'>??</span>
<a name="line-160"></a><a name="??"></a><span class='hs-comment'>-- | Prepend an element to a heterogeneous list. Used to build transformer</span>
<a name="line-161"></a><span class='hs-comment'>-- tables for 'mkToggle'.</span>
<a name="line-162"></a><span class='hs-layout'>(</span><span class='hs-varop'>??</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>HList</span> <span class='hs-varid'>b</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-163"></a><span class='hs-layout'>(</span><span class='hs-varop'>??</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>HCons</span>
<a name="line-164"></a>
<a name="line-165"></a><a name="single"></a><span class='hs-comment'>-- | Construct a singleton transformer table.</span>
<a name="line-166"></a><span class='hs-definition'>single</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HCons</span> <span class='hs-varid'>a</span> <span class='hs-conid'>EOT</span>
<a name="line-167"></a><span class='hs-definition'>single</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>??</span> <span class='hs-conid'>EOT</span><span class='hs-layout'>)</span>
<a name="line-168"></a>
<a name="line-169"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>HList</span> <span class='hs-varid'>c</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-170"></a> <span class='hs-varid'>find</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Transformer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span>
<a name="line-171"></a> <span class='hs-varid'>resolve</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>t</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Transformer</span> <span class='hs-varid'>t</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-172"></a>
<a name="line-173"></a><a name="instance%20HList%20EOT%20w"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>HList</span> <span class='hs-conid'>EOT</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>where</span>
<a name="line-174"></a> <span class='hs-varid'>find</span> <span class='hs-conid'>EOT</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-175"></a> <span class='hs-varid'>resolve</span> <span class='hs-conid'>EOT</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>d</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>d</span>
<a name="line-176"></a>
<a name="line-177"></a><a name="instance%20HList%20(HCons%20a%20b)%20w"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Transformer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-conid'>HList</span> <span class='hs-varid'>b</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HList</span> <span class='hs-layout'>(</span><span class='hs-conid'>HCons</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>where</span>
<a name="line-178"></a> <span class='hs-varid'>find</span> <span class='hs-layout'>(</span><span class='hs-conid'>HCons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
<a name="line-179"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>t</span> <span class='hs-varop'>`geq`</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-num'>0</span>
<a name="line-180"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>succ</span> <span class='hs-layout'>(</span><span class='hs-varid'>find</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-varid'>resolve</span> <span class='hs-layout'>(</span><span class='hs-conid'>HCons</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-varid'>d</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span>
<a name="line-182"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`compare`</span> <span class='hs-num'>0</span> <span class='hs-keyword'>of</span>
<a name="line-183"></a> <span class='hs-conid'>LT</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>d</span>
<a name="line-184"></a> <span class='hs-conid'>EQ</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>k</span> <span class='hs-varid'>x</span>
<a name="line-185"></a> <span class='hs-conid'>GT</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>resolve</span> <span class='hs-varid'>xs</span> <span class='hs-layout'>(</span><span class='hs-varid'>pred</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>d</span> <span class='hs-varid'>k</span>
<a name="line-186"></a>
<a name="line-187"></a><a name="geq"></a><span class='hs-definition'>geq</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-188"></a><span class='hs-definition'>geq</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>cast</span> <span class='hs-varid'>b</span>
<a name="line-189"></a>
<a name="line-190"></a><a name="instance%20LayoutClass%20(MultiToggle%20ts%20l)%20a"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-varid'>ts</span><span class='hs-layout'>,</span> <span class='hs-conid'>HList</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>LayoutClass</span> <span class='hs-varid'>l</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>LayoutClass</span> <span class='hs-layout'>(</span><span class='hs-conid'>MultiToggle</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-191"></a> <span class='hs-varid'>description</span> <span class='hs-varid'>mt</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span> <span class='hs-varop'>`unEL`</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>description</span> <span class='hs-varid'>l</span>
<a name="line-192"></a>
<a name="line-193"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>mt</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span> <span class='hs-keyword'>of</span>
<a name="line-194"></a> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>det</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mt</span> <span class='hs-layout'>{</span> <span class='hs-varid'>currLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EL</span> <span class='hs-varid'>x</span> <span class='hs-varid'>det</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-195"></a> <span class='hs-varid'>runLayout</span> <span class='hs-layout'>(</span><span class='hs-conid'>Workspace</span> <span class='hs-varid'>i</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-196"></a>
<a name="line-197"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>mt</span> <span class='hs-varid'>m</span>
<a name="line-198"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Toggle</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMessage</span> <span class='hs-varid'>m</span>
<a name="line-199"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>i</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>find</span> <span class='hs-layout'>(</span><span class='hs-varid'>transformers</span> <span class='hs-varid'>mt</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
<a name="line-200"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span> <span class='hs-keyword'>of</span>
<a name="line-201"></a> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>det</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-202"></a> <span class='hs-varid'>l'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-varid'>l</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-layout'>(</span><span class='hs-conid'>SomeMessage</span> <span class='hs-conid'>ReleaseResources</span><span class='hs-layout'>)</span>
<a name="line-203"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span>
<a name="line-204"></a> <span class='hs-varid'>mt</span> <span class='hs-layout'>{</span>
<a name="line-205"></a> <span class='hs-varid'>currLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyword'>if</span> <span class='hs-varid'>cur</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>id</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>transform'</span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>EL</span> <span class='hs-layout'>(</span><span class='hs-varid'>det</span> <span class='hs-varid'>l'</span><span class='hs-layout'>)</span> <span class='hs-varid'>id</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-206"></a> <span class='hs-varid'>currIndex</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>cur</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>i</span>
<a name="line-207"></a> <span class='hs-layout'>}</span>
<a name="line-208"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>cur</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>==</span> <span class='hs-varid'>currIndex</span> <span class='hs-varid'>mt</span><span class='hs-layout'>)</span>
<a name="line-209"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>
<a name="line-210"></a> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>currLayout</span> <span class='hs-varid'>mt</span> <span class='hs-keyword'>of</span>
<a name="line-211"></a> <span class='hs-conid'>EL</span> <span class='hs-varid'>l</span> <span class='hs-varid'>det</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mt</span> <span class='hs-layout'>{</span> <span class='hs-varid'>currLayout</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>EL</span> <span class='hs-varid'>x</span> <span class='hs-varid'>det</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-212"></a> <span class='hs-varid'>handleMessage</span> <span class='hs-varid'>l</span> <span class='hs-varid'>m</span>
</pre></body>
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