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<title>Haunt Reference Manual: Blog</title>
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<p>
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<hr>
<a name="Blog-1"></a>
<h4 class="subsection">5.6.2 Blog</h4>
<div class="example">
<pre class="example">(use-modules (haunt builder blog))
</pre></div>
<dl>
<dt><a name="index-theme"></a>Scheme Procedure: <strong>theme</strong> <em>[#:name #:layout #:post-template #:collection-template]</em></dt>
<dd><p>Create a new theme named <var>name</var>.
</p>
<p>The procedure <var>layout</var> accepts three arguments: a site, a page
title string, and an SXML tree. Its purpose is to wrap the contents
of a post with the theme’s header/footer and return the complete SXML
tree for a web page.
</p>
<p>The procedure <var>post-template</var> accepts a single argument: a post.
Its purpose is to return an SXML tree containing the contents of the
post, applying any desired post-processing operations. The values
returned from this procedure will be wrapped in the theme’s layout.
</p>
<p>The procedure <var>collection-template</var> accepts four arguments: a
site, a title string, a list of posts, and a URL prefix string. Its
purpose is to return an SXML tree containing the body of the
collection page. The values returned from this procedure will be
wrapped in the theme’s layout.
</p></dd></dl>
<dl>
<dt><a name="index-theme_003f"></a>Scheme Procedure: <strong>theme?</strong> <em><var>object</var></em></dt>
<dd><p>Return <code>#t</code> if <var>object</var> is a theme object.
</p></dd></dl>
<dl>
<dt><a name="index-blog"></a>Scheme Procedure: <strong>blog</strong> <em>[#:theme #:prefix #:collections]</em></dt>
<dd><p>Create a builder procedure that transforms a list of posts into pages
decorated by <var>theme</var>, a theme object, whose URLs start with
<var>prefix</var>.
</p>
<p>Additionally, this builder creates pages that aggregate previews of
many posts corresponding to what is specified in the list
<var>collections</var>. Each collection is a three element list in the
form <code>(title file-name filter)</code>.
</p>
<dl compact="compact">
<dt><var>title</var></dt>
<dd><p>The human readable name of the collection.
</p>
</dd>
<dt><var>file-name</var></dt>
<dd><p>The HTML file that will contain the rendered collection.
</p>
</dd>
<dt><var>filter</var></dt>
<dd><p>A procedure that accepts a list of posts as its only argument and
returns a new list of posts. The filter procedure is used to remove
and/or sort the posts into the desired form for the collection. For
example, a filter could sort posts in reverse chronological order or
select all posts that are written by a particular author.
</p>
</dd>
</dl>
<p>By default, a single collection is created that lists posts in reverse
chronological order and writes to <samp>index.html</samp>.
</p>
<p>The default theme is intended only for testing purposes.
</p>
</dd></dl>
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