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<span id="Blog"></span><div class="header">
<p>
Next: <a href="Atom.html" accesskey="n" rel="next">Atom</a>, Previous: <a href="Static-Assets.html" accesskey="p" rel="prev">Static Assets</a>, Up: <a href="Builders.html" accesskey="u" rel="up">Builders</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="Blog-1"></span><h4 class="subsection">5.6.2 Blog</h4>

<div class="example">
<pre class="example">(use-modules (haunt builder blog))
</pre></div>

<dl>
<dt id="index-theme">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&rsquo;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&rsquo;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&rsquo;s layout.
</p></dd></dl>

<dl>
<dt id="index-theme_003f">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 id="index-blog">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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