hpath/src/HPath-IO-Utils.html

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2016-06-01 12:52:48 +00:00
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<pre><a name="line-1"></a><span class='hs-comment'>-- |</span>
<a name="line-2"></a><span class='hs-comment'>-- Module : HPath.IO.Utils</span>
<a name="line-3"></a><span class='hs-comment'>-- Copyright : © 2016 Julian Ospald</span>
<a name="line-4"></a><span class='hs-comment'>-- License : GPL-2</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- Maintainer : Julian Ospald &lt;hasufell@posteo.de&gt;</span>
<a name="line-7"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-8"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-9"></a><span class='hs-comment'>--</span>
<a name="line-10"></a><span class='hs-comment'>-- Random and general IO/monad utilities.</span>
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<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>HPath</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span> <span class='hs-keyword'>where</span>
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<a name="line-16"></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-17"></a> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-varid'>when</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unless</span>
<a name="line-20"></a> <span class='hs-layout'>)</span>
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<a name="line-23"></a><a name="whenM"></a><span class='hs-comment'>-- |If the value of the first argument is True, then execute the action</span>
<a name="line-24"></a><span class='hs-comment'>-- provided in the second argument, otherwise do nothing.</span>
<a name="line-25"></a><span class='hs-definition'>whenM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-26"></a><span class='hs-definition'>whenM</span> <span class='hs-varid'>mb</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mb</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-layout'>(</span><span class='hs-varop'>`when`</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
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<a name="line-28"></a>
<a name="line-29"></a><a name="unlessM"></a><span class='hs-comment'>-- |If the value of the first argument is False, then execute the action</span>
<a name="line-30"></a><span class='hs-comment'>-- provided in the second argument, otherwise do nothing.</span>
<a name="line-31"></a><span class='hs-definition'>unlessM</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-32"></a><span class='hs-definition'>unlessM</span> <span class='hs-varid'>mb</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mb</span> <span class='hs-varop'>&gt;&gt;=</span> <span class='hs-layout'>(</span><span class='hs-varop'>`unless`</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
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