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<title>Yesod/Core/Class/Breadcrumbs.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE OverloadedStrings #-}</span>
<a name="line-2"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Yesod</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span><span class='hs-varop'>.</span><span class='hs-conid'>Breadcrumbs</span> <span class='hs-keyword'>where</span>
<a name="line-3"></a>
<a name="line-4"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Yesod</span><span class='hs-varop'>.</span><span class='hs-conid'>Core</span><span class='hs-varop'>.</span><span class='hs-conid'>Handler</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Yesod</span><span class='hs-varop'>.</span><span class='hs-conid'>Routes</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-6"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-7"></a>
<a name="line-8"></a><a name="HandlerT"></a><span class='hs-comment'>-- | A type-safe, concise method of creating breadcrumbs for pages. For each</span>
<a name="line-9"></a><a name="HandlerT"></a><span class='hs-comment'>-- resource, you declare the title of the page and the parent resource (if</span>
<a name="line-10"></a><a name="HandlerT"></a><span class='hs-comment'>-- present).</span>
<a name="line-11"></a><a name="HandlerT"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>YesodBreadcrumbs</span> <span class='hs-varid'>site</span> <span class='hs-keyword'>where</span>
<a name="line-12"></a> <span class='hs-comment'>-- | Returns the title and the parent resource, if available. If you return</span>
<a name="line-13"></a> <span class='hs-comment'>-- a 'Nothing', then this is considered a top-level page.</span>
<a name="line-14"></a> <span class='hs-varid'>breadcrumb</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Route</span> <span class='hs-varid'>site</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HandlerT</span> <span class='hs-varid'>site</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>site</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-15"></a>
<a name="line-16"></a><a name="breadcrumbs"></a><span class='hs-comment'>-- | Gets the title of the current page and the hierarchy of parent pages,</span>
<a name="line-17"></a><span class='hs-comment'>-- along with their respective titles.</span>
<a name="line-18"></a><span class='hs-definition'>breadcrumbs</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>YesodBreadcrumbs</span> <span class='hs-varid'>site</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>HandlerT</span> <span class='hs-varid'>site</span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>site</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-19"></a><span class='hs-definition'>breadcrumbs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-20"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getCurrentRoute</span>
<a name="line-21"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-22"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-str'>"Not found"</span><span class='hs-layout'>,</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-23"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-24"></a> <span class='hs-layout'>(</span><span class='hs-varid'>title</span><span class='hs-layout'>,</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>breadcrumb</span> <span class='hs-varid'>y</span>
<a name="line-25"></a> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>go</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>next</span>
<a name="line-26"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>title</span><span class='hs-layout'>,</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-keyword'>where</span>
<a name="line-28"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>back</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>back</span>
<a name="line-29"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>back</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>this</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-30"></a> <span class='hs-layout'>(</span><span class='hs-varid'>title</span><span class='hs-layout'>,</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>breadcrumb</span> <span class='hs-varid'>this</span>
<a name="line-31"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>this</span><span class='hs-layout'>,</span> <span class='hs-varid'>title</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>back</span><span class='hs-layout'>)</span> <span class='hs-varid'>next</span>
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