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<title>XMonad/Actions/RandomBackground.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.Actions.RandomBackground</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) 2009 Anze Slosar</span>
<a name="line-5"></a><span class='hs-comment'>-- translation to Haskell by Adam Vogt</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : <vogt.adam@gmail.com></span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : unstable</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : unportable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- An action to start terminals with a random background color</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>module</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'>RandomBackground</span> <span class='hs-layout'>(</span>
<a name="line-17"></a> <span class='hs-comment'>-- * Usage</span>
<a name="line-18"></a> <span class='hs-comment'>-- $usage</span>
<a name="line-19"></a> <span class='hs-varid'>randomBg'</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-varid'>randomBg</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-conid'>RandomColor</span><span class='hs-layout'>(</span><span class='hs-conid'>HSV</span><span class='hs-layout'>,</span><span class='hs-conid'>RGB</span><span class='hs-layout'>)</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>XMonad</span><span class='hs-layout'>(</span><span class='hs-conid'>X</span><span class='hs-layout'>,</span> <span class='hs-conid'>XConf</span><span class='hs-layout'>(</span><span class='hs-varid'>config</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>XConfig</span><span class='hs-layout'>(</span><span class='hs-varid'>terminal</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>io</span><span class='hs-layout'>,</span> <span class='hs-varid'>spawn</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-conid'>MonadIO</span><span class='hs-layout'>,</span> <span class='hs-varid'>asks</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>Random</span>
<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'>Monad</span><span class='hs-layout'>(</span><span class='hs-varid'>liftM</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Numeric</span><span class='hs-layout'>(</span><span class='hs-varid'>showHex</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-comment'>-- $usage</span>
<a name="line-31"></a><span class='hs-comment'>--</span>
<a name="line-32"></a><span class='hs-comment'>-- Add to your keybindings something like:</span>
<a name="line-33"></a><span class='hs-comment'>--</span>
<a name="line-34"></a><span class='hs-comment'>-- > ,((modm .|. shiftMask, xK_Return), randomBg $ HSV 0xff 0x20</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="RandomColor"></a><span class='hs-comment'>-- | RandomColor fixes constraints when generating random colors. All</span>
<a name="line-37"></a><a name="RandomColor"></a><span class='hs-comment'>-- parameters should be in the range 0 -- 0xff</span>
<a name="line-38"></a><a name="RandomColor"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RandomColor</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RGB</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_colorMin</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_colorMax</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-40"></a> <span class='hs-layout'>}</span> <span class='hs-comment'>-- ^ specify the minimum and maximum lowest values for each color channel.</span>
<a name="line-41"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HSV</span> <span class='hs-layout'>{</span> <span class='hs-sel'>_colorSaturation</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-sel'>_colorValue</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Double</span>
<a name="line-43"></a> <span class='hs-layout'>}</span> <span class='hs-comment'>-- ^ specify the saturation and value, leaving the hue random.</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="toHex"></a><span class='hs-definition'>toHex</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-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-46"></a><span class='hs-definition'>toHex</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-str'>"'#"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-str'>"'"</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>concatMap</span> <span class='hs-layout'>(</span><span class='hs-varid'>ensure</span> <span class='hs-num'>2</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span> <span class='hs-str'>""</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>showHex</span><span class='hs-layout'>)</span>
<a name="line-47"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>ensure</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>.</span> <span class='hs-varid'>take</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-varid'>repeat</span> <span class='hs-chr'>'0'</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>reverse</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="randPermutation"></a><span class='hs-definition'>randPermutation</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>RandomGen</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-50"></a><span class='hs-definition'>randPermutation</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>g</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>swap</span> <span class='hs-varop'>$</span> <span class='hs-varid'>zip</span> <span class='hs-layout'>(</span><span class='hs-varid'>randoms</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span>
<a name="line-51"></a> <span class='hs-keyword'>where</span>
<a name="line-52"></a> <span class='hs-varid'>swap</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>swap</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span>
<a name="line-53"></a> <span class='hs-varid'>swap</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span><span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>swap</span> <span class='hs-varid'>ys</span>
<a name="line-54"></a> <span class='hs-varid'>swap</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>snd</span> <span class='hs-varid'>x</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="randomBg'"></a><span class='hs-comment'>-- | @randomBg'@ produces a random hex number in the form @'#xxyyzz'@</span>
<a name="line-57"></a><span class='hs-definition'>randomBg'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadIO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>RandomColor</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-conid'>String</span>
<a name="line-58"></a><span class='hs-definition'>randomBg'</span> <span class='hs-layout'>(</span><span class='hs-conid'>RGB</span> <span class='hs-varid'>l</span> <span class='hs-varid'>h</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>toHex</span> <span class='hs-varop'>.</span> <span class='hs-varid'>take</span> <span class='hs-num'>3</span> <span class='hs-varop'>.</span> <span class='hs-varid'>randomRs</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>h</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>newStdGen</span>
<a name="line-59"></a><span class='hs-definition'>randomBg'</span> <span class='hs-layout'>(</span><span class='hs-conid'>HSV</span> <span class='hs-varid'>s</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>io</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-60"></a> <span class='hs-varid'>g</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>newStdGen</span>
<a name="line-61"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varop'>^</span><span class='hs-layout'>(</span><span class='hs-num'>2</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-varop'>$</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>randomR</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-varid'>sqrt</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pi</span> <span class='hs-varop'>/</span> <span class='hs-num'>3</span><span class='hs-layout'>)</span> <span class='hs-varid'>g</span>
<a name="line-62"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>toHex</span> <span class='hs-varop'>$</span> <span class='hs-varid'>map</span> <span class='hs-varid'>round</span> <span class='hs-varop'>$</span> <span class='hs-varid'>randPermutation</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-comment'>-</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-varop'>*</span><span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>g</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="randomBg"></a><span class='hs-comment'>-- | @randomBg@ starts a terminal with the background color taken from 'randomBg''</span>
<a name="line-65"></a><span class='hs-comment'>--</span>
<a name="line-66"></a><span class='hs-comment'>-- This depends on the your 'terminal' configuration field accepting an</span>
<a name="line-67"></a><span class='hs-comment'>-- argument like @-bg '#ff0023'@</span>
<a name="line-68"></a><span class='hs-definition'>randomBg</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RandomColor</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>X</span> <span class='hs-conid'>()</span>
<a name="line-69"></a><span class='hs-definition'>randomBg</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-70"></a> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>asks</span> <span class='hs-layout'>(</span><span class='hs-varid'>terminal</span> <span class='hs-varop'>.</span> <span class='hs-varid'>config</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>randomBg'</span> <span class='hs-varid'>x</span>
<a name="line-72"></a> <span class='hs-varid'>spawn</span> <span class='hs-varop'>$</span> <span class='hs-varid'>t</span> <span class='hs-varop'>++</span> <span class='hs-str'>" -bg "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>c</span>
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