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<title>Haunt Reference Manual: Readers</title>
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<a name="Readers"></a>
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<hr>
<a name="Readers-1"></a>
<h3 class="section">5.3 Readers</h3>
<div class="example">
<pre class="example">(use-modules (haunt reader))
</pre></div>
<p>The purpose of a reader is to translate the markup within a post file
into an SXML tree representing the HTML structure and associate some
metadata with it.
</p>
<dl>
<dt><a name="index-make_002dreader"></a>Scheme Procedure: <strong>make-reader</strong> <em><var>matcher</var> <var>proc</var></em></dt>
<dd><p>Create a new reader. The reader is to be activated when
<var>matcher</var>, a procedure that accepts a file name as its only
argument, returns <code>#t</code>. When a post file matches, the procedure
<var>proc</var>, which also accepts a file name as its only argument, reads
the contents and returns a post object (see <a href="Posts.html#Posts">Posts</a>).
</p></dd></dl>
<dl>
<dt><a name="index-reader_003f"></a>Scheme Procedure: <strong>reader?</strong> <em><var>object</var></em></dt>
<dd><p>Return <code>#t</code> if <var>object</var> is a reader.
</p></dd></dl>
<dl>
<dt><a name="index-reader_002dmatcher"></a>Scheme Procedure: <strong>reader-matcher</strong> <em><var>reader</var></em></dt>
<dd><p>Return the match procedure for <var>reader</var>.
</p></dd></dl>
<dl>
<dt><a name="index-reader_002dmatcher-1"></a>Scheme Procedure: <strong>reader-matcher</strong> <em><var>reader</var></em></dt>
<dd><p>Return the read procedure for <var>reader</var>.
</p></dd></dl>
<dl>
<dt><a name="index-reader_002dmatch_003f"></a>Scheme Procedure: <strong>reader-match?</strong> <em><var>reader</var> <var>file-name</var></em></dt>
<dd><p>Return <code>#t</code> if <var>file-name</var> is a file supported by
<var>reader</var>.
</p></dd></dl>
<dl>
<dt><a name="index-read_002dpost"></a>Scheme Procedure: <strong>read-post</strong> <em><var>reader</var> <var>file-name</var> [<var>default-metadata</var>]</em></dt>
<dd><p>Read a post object from <var>file-name</var> using <var>reader</var>, merging
its metadata with <var>default-metadata</var>, or the empty list if not
specified.
</p></dd></dl>
<dl>
<dt><a name="index-read_002dposts"></a>Scheme Procedure: <strong>read-posts</strong> <em><var>directory</var> <var>keep?</var> <var>readers</var> [<var>default-metadata</var>]</em></dt>
<dd><p>Read all of the files in <var>directory</var> that match <var>keep?</var> as
post objects. The <var>readers</var> list must contain a matching reader
for every post.
</p></dd></dl>
<dl>
<dt><a name="index-make_002dfile_002dextension_002dmatcher"></a>Scheme Procedure: <strong>make-file-extension-matcher</strong> <em><var>ext</var></em></dt>
<dd><p>Create a procedure that returns <code>#t</code> when a file name ends with
“.ext”.
</p></dd></dl>
<dl>
<dt><a name="index-sxml_002dreader"></a>Scheme Procedure: <strong>sxml-reader</strong></dt>
<dd><p>A basic reader for posts written as Scheme code that evaluates to an
an association list. The special key <code>content</code> contains the post
body as an SXML tree.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">(use-modules (haunt utils))
`((title . "Hello, world!")
(date . ,(string->date* "2015-04-10 23:00"))
(tags "foo" "bar")
(summary . "Just a test")
(content
((h2 "Hello!")
(p "This is Haunt. A static site generator for GNU Guile."))))
</pre></div>
</dd></dl>
<dl>
<dt><a name="index-html_002dreader"></a>Scheme Procedure: <strong>html-reader</strong></dt>
<dd><p>A basic reader for posts written in plain ol’ HTML. Metadata is
encoded as the <code>key: value</code> pairs, one per line, at the beginning
of the file. A line with the <code>---</code> sentinel marks the end of the
metadata section and the rest of the file is encoded as HTML.
</p>
<p>Example:
</p>
<div class="example">
<pre class="example">title: A Foo Walks Into a Bar
date: 2015-04-11 20:00
tags: bar
---
<p>
This is an example using raw HTML, because Guile doesn't have a
Markdown parser.
</p>
</pre></div>
</dd></dl>
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