[elpa] externals/webfeeder 7000480 01/22: Init

[Pierre Neidhardt]

branch: externals/webfeeder
commit 70004800cc1265032b5ac8b79e514cc7fe0656d7
Author: Pierre Neidhardt <address@hidden>
Commit: Pierre Neidhardt <address@hidden>

    Init
---
 COPYING                             | 674 ++++++++++++++++++++++++++++++++++++
 Makefile                            |  11 +
 readme.org                          | 107 ++++++
 testdata/default-post0.atom         |  38 ++
 testdata/default-post0.rss          |  40 +++
 testdata/libxml-post0+post1.atom    |  87 +++++
 testdata/libxml-post0+post1.rss     |  89 +++++
 testdata/libxml-post0-no-fancy.atom |  37 ++
 testdata/libxml-post0-no-fancy.rss  |  39 +++
 testdata/libxml-post0-no-html.atom  |  37 ++
 testdata/libxml-post0-no-html.rss   |  39 +++
 testdata/libxml-post0.atom          |  35 ++
 testdata/libxml-post0.rss           |  37 ++
 testdata/libxml-post1.atom          |  61 ++++
 testdata/libxml-post1.rss           |  63 ++++
 testdata/post0-html5-fancy.html     |  50 +++
 testdata/post0-html5.html           |  51 +++
 testdata/post0.html                 |  53 +++
 testdata/post0.org                  |  16 +
 testdata/post1-html5-fancy.html     |  73 ++++
 testdata/post1-html5.html           |  72 ++++
 testdata/post1.html                 |  74 ++++
 testdata/post1.org                  |  34 ++
 webfeeder-test-gen.el               | 121 +++++++
 webfeeder-test.el                   | 198 +++++++++++
 webfeeder.el                        | 484 ++++++++++++++++++++++++++
 26 files changed, 2620 insertions(+)

diff --git a/COPYING b/COPYING
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/COPYING
@@ -0,0 +1,674 @@
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+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..c1d9f47
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,11 @@
+EMACS = emacs
+EMACS_FLAGS = -q
+
+check:
+       $(EMACS) $(EMACS_FLAGS) -batch -l ert -l webfeeder-test.el -f 
ert-run-tests-batch-and-exit
+
+html:
+       $(EMACS) $(EMACS_FLAGS) -batch -l webfeeder.el -l webfeeder-test.el -l 
webfeeder-test-gen.el -f webfeeder-test-gen
+
+feeds:
+       $(EMACS) $(EMACS_FLAGS) -batch -l webfeeder.el -l webfeeder-test.el -l 
webfeeder-test-gen.el -f webfeeder-test-gen-feeds
diff --git a/readme.org b/readme.org
new file mode 100644
index 0000000..8483b52
--- /dev/null
+++ b/readme.org
@@ -0,0 +1,107 @@
+#+TITLE: Emacs Webfeeder
+
+Webfeeder is an Emacs library to generate 
[[https://en.wikipedia.org/wiki/RSS][RSS]] and 
[[https://en.wikipedia.org/wiki/Atom_(Web_standard)][Atom]] feeds from HTML 
files.
+
+Other webfeed generators have been written for Emacs, but either they are tied
+to other projects like blog generators, or they only work on Org files like
+=ox-rss=.  Since Webfeeder generates webfeeds from HTML files, it is more
+general.
+
+The various elements of the HTML input are parsed with customizable functions.
+For instance, Webfeeder offers two functions to parse the title:
+~feed-builder-title-libxml~ (using libxml if your Emacs is linked against it)
+and the less reliable ~feed-builder-title-default~.
+Feel free to write you own function and bind ~feed-builder-title-function~
+before generating the feeds.
+
+The generated feeds should be valid on https://validator.w3.org/feed/.  If not,
+it's a bug, please report.
+
+The full list of customizable functions is documented in
+~feed-builder-html-files-to-items~.
+
+* Installation
+
+Get the package, either from [[https://guix.info][Guix]] or ELPA:
+
+: M-x package-install RET webfeeder RET
+
+Or clone / download this repository and modify your ~load-path~.
+
+: (add-to-list 'load-path (expand-file-name "/path/to/this-package/" 
user-emacs-directory))
+
+Load the package with
+
+: (require 'webfeeder)
+
+* Usage
+
+- Build an Atom feed:
+
+#+begin_src elisp
+(feed-builder-build
+ "atom.xml"
+ "./public"
+ "https://example.org/";
+ '("post1.html" "post2.html" "post3.html")
+ (delete "index.html"
+         (mapcar (lambda (f) (replace-regexp-in-string ".*/public/" "" f))
+                 (directory-files-recursively "public" "index.html")))
+ :title "My homepage"
+ :description "A collection of articles")
+#+end_src
+
+- To build an RSS feed, use the RSS builder:
+
+#+begin_src elisp
+(feed-builder-build
+ "rss.xml"
+ "./public"
+ "https://example.org/";
+ '("post1.html" "post2.html" "post3.html")
+ (delete "index.html"
+         (mapcar (lambda (f) (replace-regexp-in-string ".*/public/" "" f))
+                 (directory-files-recursively "public" "index.html")))
+ :title "My homepage"
+ :description "A collection of articles"
+ :builder 'feed-builder-make-rss)
+#+end_src
+
+- Use a custom title query function:
+
+#+begin_src elisp
+(defun my-title-query (html-file)
+  "Return the title from the \"title\" class in the HTML file."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (title (dom-text (car (dom-by-class dom "title")))))
+      (if (string= "" title)
+          nil
+        title))))
+
+(let ((feed-builder-title-function 'my-title-query))
+  (feed-builder-build
+   ; ...))
+#+end_src
+
+- Limit the feed to 20 articles:
+
+#+begin_src elisp
+(feed-builder-build
+ ; ...
+ :max-entries 20)
+#+end_src
+
+- Filter some entries with a predicate
+
+#+begin_src elisp
+(defun item-author-is-Alice-p (item)
+  (string= (feed-builder-item-author item) "Alice")
+
+(feed-builder-build
+ ; ...
+ :predicate 'item-author-is-Alice-p)
+#+end_src
+
+See the documentation of ~feed-builder-build~ for more options.
diff --git a/testdata/default-post0.atom b/testdata/default-post0.atom
new file mode 100644
index 0000000..67c1831
--- /dev/null
+++ b/testdata/default-post0.atom
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/default-post0.atom"; rel="self"/>
+<id>https://example.org/default-post0.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>First post</title>
+  <author><name>John Doe</name></author>
+  <summary>First post's subtitle</summary>
+  <content><![CDATA[
+<p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+<div id="outline-container-org86962ff" class="outline-2">
+<h2 id="org86962ff"><span class="section-number-2">1</span> Contacts</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>Email: <a 
href="https://example.org/post0-html5-fancy.html/mailto:address@hidden";>address@hidden</a></li>
+</ul>
+</div>
+</div>
+</div>
+]]></content>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <id>https://example.org/post0-html5-fancy.html</id>
+  <updated>2019-03-13T17:46:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/default-post0.rss b/testdata/default-post0.rss
new file mode 100644
index 0000000..4d17520
--- /dev/null
+++ b/testdata/default-post0.rss
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/default-post0.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <author>John Doe</author>
+  <title>First post</title>
+  <comments>First post's subtitle</comments>
+  <description><![CDATA[
+<p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+<div id="outline-container-org86962ff" class="outline-2">
+<h2 id="org86962ff"><span class="section-number-2">1</span> Contacts</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>Email: <a 
href="https://example.org/post0-html5-fancy.html/mailto:address@hidden";>address@hidden</a></li>
+</ul>
+</div>
+</div>
+</div>
+]]></description>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <guid isPermaLink="false">https://example.org/post0-html5-fancy.html</guid>
+  <pubDate>Wed, 13 Mar 2019 17:46:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/libxml-post0+post1.atom b/testdata/libxml-post0+post1.atom
new file mode 100644
index 0000000..1cd34e2
--- /dev/null
+++ b/testdata/libxml-post0+post1.atom
@@ -0,0 +1,87 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/libxml-post0+post1.atom"; rel="self"/>
+<id>https://example.org/libxml-post0+post1.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>Second post</title>
+  <content><![CDATA[<div id="content">
+ <p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+ <div id="outline-container-org603c6e3" class="outline-2">
+ <h2 id="org603c6e3"> <span class="section-number-2">1</span> Section 1</h2>
+ <div class="outline-text-2" id="text-1">
+ <p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+ <div id="outline-container-org327bd12" class="outline-2">
+ <h2 id="org327bd12"> <span class="section-number-2">2</span> Section 2</h2>
+ <div class="outline-text-2" id="text-2">
+ <p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post1-html5-fancy.html</link>
+  <id>https://example.org/post1-html5-fancy.html</id>
+  <updated>2019-03-13T01:00:00+0100</updated>
+</entry>
+<entry>
+  <title>First post</title>
+  <author><name>John Doe</name></author>
+  <summary>First post's subtitle</summary>
+  <content><![CDATA[<div id="content">
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org86962ff" class="outline-2">
+ <h2 id="org86962ff"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <id>https://example.org/post0-html5-fancy.html</id>
+  <updated>2019-01-27T01:00:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/libxml-post0+post1.rss b/testdata/libxml-post0+post1.rss
new file mode 100644
index 0000000..c1d043f
--- /dev/null
+++ b/testdata/libxml-post0+post1.rss
@@ -0,0 +1,89 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/libxml-post0+post1.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <title>Second post</title>
+  <description><![CDATA[<div id="content">
+ <p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+ <div id="outline-container-org603c6e3" class="outline-2">
+ <h2 id="org603c6e3"> <span class="section-number-2">1</span> Section 1</h2>
+ <div class="outline-text-2" id="text-1">
+ <p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+ <div id="outline-container-org327bd12" class="outline-2">
+ <h2 id="org327bd12"> <span class="section-number-2">2</span> Section 2</h2>
+ <div class="outline-text-2" id="text-2">
+ <p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post1-html5-fancy.html</link>
+  <guid isPermaLink="false">https://example.org/post1-html5-fancy.html</guid>
+  <pubDate>Wed, 13 Mar 2019 01:00:00 +0100</pubDate>
+</item>
+<item>
+  <author>John Doe</author>
+  <title>First post</title>
+  <comments>First post's subtitle</comments>
+  <description><![CDATA[<div id="content">
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org86962ff" class="outline-2">
+ <h2 id="org86962ff"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <guid isPermaLink="false">https://example.org/post0-html5-fancy.html</guid>
+  <pubDate>Sun, 27 Jan 2019 01:00:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/libxml-post0-no-fancy.atom 
b/testdata/libxml-post0-no-fancy.atom
new file mode 100644
index 0000000..17394ce
--- /dev/null
+++ b/testdata/libxml-post0-no-fancy.atom
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/libxml-post0-no-fancy.atom"; rel="self"/>
+<id>https://example.org/libxml-post0-no-fancy.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>First post</title>
+  <author><name>John Doe</name></author>
+  <summary>First post's subtitle</summary>
+  <content><![CDATA[<div id="content">
+
+
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org8dd18bc" class="outline-2">
+ <h2 id="org8dd18bc"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post0-html5.html</link>
+  <id>https://example.org/post0-html5.html</id>
+  <updated>2019-01-27T01:00:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/libxml-post0-no-fancy.rss 
b/testdata/libxml-post0-no-fancy.rss
new file mode 100644
index 0000000..25e643b
--- /dev/null
+++ b/testdata/libxml-post0-no-fancy.rss
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/libxml-post0-no-fancy.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <author>John Doe</author>
+  <title>First post</title>
+  <comments>First post's subtitle</comments>
+  <description><![CDATA[<div id="content">
+
+
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org8dd18bc" class="outline-2">
+ <h2 id="org8dd18bc"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post0-html5.html</link>
+  <guid isPermaLink="false">https://example.org/post0-html5.html</guid>
+  <pubDate>Sun, 27 Jan 2019 01:00:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/libxml-post0-no-html.atom 
b/testdata/libxml-post0-no-html.atom
new file mode 100644
index 0000000..333884a
--- /dev/null
+++ b/testdata/libxml-post0-no-html.atom
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/libxml-post0-no-html.atom"; rel="self"/>
+<id>https://example.org/libxml-post0-no-html.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>First post</title>
+  <author><name>John Doe</name></author>
+  <summary>First post's subtitle</summary>
+  <content><![CDATA[<div id="content">
+
+
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org920b108" class="outline-2">
+ <h2 id="org920b108"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post0.html</link>
+  <id>https://example.org/post0.html</id>
+  <updated>2019-01-27T01:00:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/libxml-post0-no-html.rss 
b/testdata/libxml-post0-no-html.rss
new file mode 100644
index 0000000..5e6d049
--- /dev/null
+++ b/testdata/libxml-post0-no-html.rss
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/libxml-post0-no-html.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <author>John Doe</author>
+  <title>First post</title>
+  <comments>First post's subtitle</comments>
+  <description><![CDATA[<div id="content">
+
+
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org920b108" class="outline-2">
+ <h2 id="org920b108"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post0.html</link>
+  <guid isPermaLink="false">https://example.org/post0.html</guid>
+  <pubDate>Sun, 27 Jan 2019 01:00:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/libxml-post0.atom b/testdata/libxml-post0.atom
new file mode 100644
index 0000000..7167036
--- /dev/null
+++ b/testdata/libxml-post0.atom
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/libxml-post0.atom"; rel="self"/>
+<id>https://example.org/libxml-post0.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>First post</title>
+  <author><name>John Doe</name></author>
+  <summary>First post's subtitle</summary>
+  <content><![CDATA[<div id="content">
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org86962ff" class="outline-2">
+ <h2 id="org86962ff"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <id>https://example.org/post0-html5-fancy.html</id>
+  <updated>2019-01-27T01:00:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/libxml-post0.rss b/testdata/libxml-post0.rss
new file mode 100644
index 0000000..aa4da68
--- /dev/null
+++ b/testdata/libxml-post0.rss
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/libxml-post0.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <author>John Doe</author>
+  <title>First post</title>
+  <comments>First post's subtitle</comments>
+  <description><![CDATA[<div id="content">
+ <p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+ <div id="outline-container-org86962ff" class="outline-2">
+ <h2 id="org86962ff"> <span class="section-number-2">1</span> Contacts</h2>
+ <div class="outline-text-2" id="text-1">
+ <ul class="org-ul"> <li>Email:  <a 
href="mailto:address@hidden";>address@hidden</a></li>
+</ul></div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post0-html5-fancy.html</link>
+  <guid isPermaLink="false">https://example.org/post0-html5-fancy.html</guid>
+  <pubDate>Sun, 27 Jan 2019 01:00:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/libxml-post1.atom b/testdata/libxml-post1.atom
new file mode 100644
index 0000000..dcfc3e1
--- /dev/null
+++ b/testdata/libxml-post1.atom
@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<feed xmlns="http://www.w3.org/2005/Atom";><title>Example feed</title>
+<summary>Example description</summary>
+<generator>Emacs webfeeder.el</generator>
+<link href="https://example.org/";>
+<link href="https://example.org/libxml-post1.atom"; rel="self"/>
+<id>https://example.org/libxml-post1.atom</id>
+<updated>1970-01-01T01:00:00+0100</updated>
+<entry>
+  <title>Second post</title>
+  <content><![CDATA[<div id="content">
+ <p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+ <div id="outline-container-org603c6e3" class="outline-2">
+ <h2 id="org603c6e3"> <span class="section-number-2">1</span> Section 1</h2>
+ <div class="outline-text-2" id="text-1">
+ <p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+ <div id="outline-container-org327bd12" class="outline-2">
+ <h2 id="org327bd12"> <span class="section-number-2">2</span> Section 2</h2>
+ <div class="outline-text-2" id="text-2">
+ <p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>]]></content>
+  <link>https://example.org/post1-html5-fancy.html</link>
+  <id>https://example.org/post1-html5-fancy.html</id>
+  <updated>2019-03-13T01:00:00+0100</updated>
+</entry>
+</feed>
diff --git a/testdata/libxml-post1.rss b/testdata/libxml-post1.rss
new file mode 100644
index 0000000..3c3fa08
--- /dev/null
+++ b/testdata/libxml-post1.rss
@@ -0,0 +1,63 @@
+<?xml version="1.0" encoding="utf-8"?>
+<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom";>
+<channel>
+<title>Example feed</title>
+<description>Example description</description>
+<generator>Emacs webfeeder.el</generator>
+<link>https://example.org/</link>
+<atom:link href="https://example.org/libxml-post1.rss"; rel="self" 
type="application/rss+xml"/>
+<lastBuildDate>Thu, 01 Jan 1970 01:00:00 +0100</lastBuildDate>
+<item>
+  <title>Second post</title>
+  <description><![CDATA[<div id="content">
+ <p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+ <div id="outline-container-org603c6e3" class="outline-2">
+ <h2 id="org603c6e3"> <span class="section-number-2">1</span> Section 1</h2>
+ <div class="outline-text-2" id="text-1">
+ <p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+ <div id="outline-container-org327bd12" class="outline-2">
+ <h2 id="org327bd12"> <span class="section-number-2">2</span> Section 2</h2>
+ <div class="outline-text-2" id="text-2">
+ <p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>]]></description>
+  <link>https://example.org/post1-html5-fancy.html</link>
+  <guid isPermaLink="false">https://example.org/post1-html5-fancy.html</guid>
+  <pubDate>Wed, 13 Mar 2019 01:00:00 +0100</pubDate>
+</item>
+</channel>
+</rss>
diff --git a/testdata/post0-html5-fancy.html b/testdata/post0-html5-fancy.html
new file mode 100644
index 0000000..22408c5
--- /dev/null
+++ b/testdata/post0-html5-fancy.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>First post</title>
+<meta name="generator" content="Org mode">
+<meta name="author" content="John Doe">
+</head>
+<body>
+<div id="content">
+<header>
+<h1 class="title">First post</h1>
+<p class="subtitle">First post's subtitle</p>
+</header><nav id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org86962ff">1. Contacts</a></li>
+</ul>
+</div>
+</nav>
+<p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+<div id="outline-container-org86962ff" class="outline-2">
+<h2 id="org86962ff"><span class="section-number-2">1</span> Contacts</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>Email: <a href="mailto:address@hidden";>address@hidden</a></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Date: 2019-01-27 Sun 00:00</p>
+<p class="author">Author: John Doe</p>
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post0-html5.html b/testdata/post0-html5.html
new file mode 100644
index 0000000..6dbd3f4
--- /dev/null
+++ b/testdata/post0-html5.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>First post</title>
+<meta name="generator" content="Org mode">
+<meta name="author" content="John Doe">
+</head>
+<body>
+<div id="content">
+<h1 class="title">First post
+<br>
+<span class="subtitle">First post's subtitle</span>
+</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org8dd18bc">1. Contacts</a></li>
+</ul>
+</div>
+</div>
+<p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+<div id="outline-container-org8dd18bc" class="outline-2">
+<h2 id="org8dd18bc"><span class="section-number-2">1</span> Contacts</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>Email: <a href="mailto:address@hidden";>address@hidden</a></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Date: 2019-01-27 Sun 00:00</p>
+<p class="author">Author: John Doe</p>
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post0.html b/testdata/post0.html
new file mode 100644
index 0000000..93b81da
--- /dev/null
+++ b/testdata/post0.html
@@ -0,0 +1,53 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
+<html xmlns="http://www.w3.org/1999/xhtml"; lang="en" xml:lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>First post</title>
+<meta name="generator" content="Org mode" />
+<meta name="author" content="John Doe" />
+</head>
+<body>
+<div id="content">
+<h1 class="title">First post
+<br />
+<span class="subtitle">First post's subtitle</span>
+</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org920b108">1. Contacts</a></li>
+</ul>
+</div>
+</div>
+<p>
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+</p>
+
+<div id="outline-container-org920b108" class="outline-2">
+<h2 id="org920b108"><span class="section-number-2">1</span> Contacts</h2>
+<div class="outline-text-2" id="text-1">
+<ul class="org-ul">
+<li>Email: <a href="mailto:address@hidden";>address@hidden</a></li>
+</ul>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Date: 2019-01-27 Sun 00:00</p>
+<p class="author">Author: John Doe</p>
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post0.org b/testdata/post0.org
new file mode 100644
index 0000000..a28d300
--- /dev/null
+++ b/testdata/post0.org
@@ -0,0 +1,16 @@
+#+TITLE: First post
+#+SUBTITLE: First post's subtitle
+#+AUTHOR: John Doe
+#+DATE: <2019-01-27 Sun>
+
+Aliquam erat volutpat.  Nunc eleifend leo vitae magna.  In id erat non orci
+commodo lobortis.  Proin neque massa, cursus ut, gravida ut, lobortis eget,
+lacus.  Sed diam.  Praesent fermentum tempor tellus.  Nullam tempus.  Mauris ac
+felis vel velit tristique imperdiet.  Donec at pede.  Etiam vel neque nec dui
+dignissim bibendum.  Vivamus id enim.  Phasellus neque orci, porta a, aliquet
+quis, semper a, massa.  Phasellus purus.  Pellentesque tristique imperdiet
+tortor.  Nam euismod tellus id erat.
+
+* Contacts
+
+- Email: [[mailto:address@hidden@ambrevar.xyz]]
diff --git a/testdata/post1-html5-fancy.html b/testdata/post1-html5-fancy.html
new file mode 100644
index 0000000..abfacad
--- /dev/null
+++ b/testdata/post1-html5-fancy.html
@@ -0,0 +1,73 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Second post</title>
+<meta name="generator" content="Org mode">
+</head>
+<body>
+<div id="content">
+<header>
+<h1 class="title">Second post</h1>
+</header><nav id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#org603c6e3">1. Section 1</a></li>
+<li><a href="#org327bd12">2. Section 2</a></li>
+</ul>
+</div>
+</nav>
+<p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+<div id="outline-container-org603c6e3" class="outline-2">
+<h2 id="org603c6e3"><span class="section-number-2">1</span> Section 1</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+<div id="outline-container-org327bd12" class="outline-2">
+<h2 id="org327bd12"><span class="section-number-2">2</span> Section 2</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post1-html5.html b/testdata/post1-html5.html
new file mode 100644
index 0000000..aec89b8
--- /dev/null
+++ b/testdata/post1-html5.html
@@ -0,0 +1,72 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Second post</title>
+<meta name="generator" content="Org mode">
+</head>
+<body>
+<div id="content">
+<h1 class="title">Second post</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#orgcf5e277">1. Section 1</a></li>
+<li><a href="#org893ed57">2. Section 2</a></li>
+</ul>
+</div>
+</div>
+<p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+<div id="outline-container-orgcf5e277" class="outline-2">
+<h2 id="orgcf5e277"><span class="section-number-2">1</span> Section 1</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+<div id="outline-container-org893ed57" class="outline-2">
+<h2 id="org893ed57"><span class="section-number-2">2</span> Section 2</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post1.html b/testdata/post1.html
new file mode 100644
index 0000000..275b2c4
--- /dev/null
+++ b/testdata/post1.html
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
+"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
+<html xmlns="http://www.w3.org/1999/xhtml"; lang="en" xml:lang="en">
+<head>
+<!-- 2019-03-13 Wed 17:46 -->
+<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<title>Second post</title>
+<meta name="generator" content="Org mode" />
+</head>
+<body>
+<div id="content">
+<h1 class="title">Second post</h1>
+<div id="table-of-contents">
+<h2>Table of Contents</h2>
+<div id="text-table-of-contents">
+<ul>
+<li><a href="#orgf862c19">1. Section 1</a></li>
+<li><a href="#orgdda7921">2. Section 2</a></li>
+</ul>
+</div>
+</div>
+<p>
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+</p>
+
+<div id="outline-container-orgf862c19" class="outline-2">
+<h2 id="orgf862c19"><span class="section-number-2">1</span> Section 1</h2>
+<div class="outline-text-2" id="text-1">
+<p>
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+</p>
+</div>
+</div>
+
+<div id="outline-container-orgdda7921" class="outline-2">
+<h2 id="orgdda7921"><span class="section-number-2">2</span> Section 2</h2>
+<div class="outline-text-2" id="text-2">
+<p>
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
+</p>
+</div>
+</div>
+</div>
+<div id="postamble" class="status">
+<p class="date">Created: 2019-03-13 Wed 17:46</p>
+<p class="validation"><a 
href="http://validator.w3.org/check?uri=referer";>Validate</a></p>
+</div>
+</body>
+</html>
diff --git a/testdata/post1.org b/testdata/post1.org
new file mode 100644
index 0000000..879ceea
--- /dev/null
+++ b/testdata/post1.org
@@ -0,0 +1,34 @@
+#+TITLE: Second post
+
+Nullam eu ante vel est convallis dignissim.  Fusce suscipit, wisi nec facilisis
+facilisis, est dui fermentum leo, quis tempor ligula erat quis odio.  Nunc 
porta
+vulputate tellus.  Nunc rutrum turpis sed pede.  Sed bibendum.  Aliquam 
posuere.
+Nunc aliquet, augue nec adipiscing interdum, lacus tellus malesuada massa, quis
+varius mi purus non odio.  Pellentesque condimentum, magna ut suscipit
+hendrerit, ipsum augue ornare nulla, non luctus diam neque sit amet urna.
+Curabitur vulputate vestibulum lorem.  Fusce sagittis, libero non molestie
+mollis, magna orci ultrices dolor, at vulputate neque nulla lacinia eros.  Sed
+id ligula quis est convallis tempor.  Curabitur lacinia pulvinar nibh.  Nam a
+sapien.
+
+* Section 1
+
+Lorem ipsum dolor sit amet, consectetuer adipiscing elit.  Donec hendrerit
+tempor tellus.  Donec pretium posuere tellus.  Proin quam nisl, tincidunt et,
+mattis eget, convallis nec, purus.  Cum sociis natoque penatibus et magnis dis
+parturient montes, nascetur ridiculus mus.  Nulla posuere.  Donec vitae dolor.
+Nullam tristique diam non turpis.  Cras placerat accumsan nulla.  Nullam 
rutrum.
+Nam vestibulum accumsan nisl.
+
+* Section 2
+
+Pellentesque dapibus suscipit ligula.  Donec posuere augue in quam.  Etiam vel
+tortor sodales tellus ultricies commodo.  Suspendisse potenti.  Aenean in sem 
ac
+leo mollis blandit.  Donec neque quam, dignissim in, mollis nec, sagittis eu,
+wisi.  Phasellus lacus.  Etiam laoreet quam sed arcu.  Phasellus at dui in
+ligula mollis ultricies.  Integer placerat tristique nisl.  Praesent augue.
+Fusce commodo.  Vestibulum convallis, lorem a tempus semper, dui dui euismod
+elit, vitae placerat urna tortor vitae lacus.  Nullam libero mauris, consequat
+quis, varius et, dictum id, arcu.  Mauris mollis tincidunt felis.  Aliquam
+feugiat tellus ut neque.  Nulla facilisis, risus a rhoncus fermentum, tellus
+tellus lacinia purus, et dictum nunc justo sit amet elit.
diff --git a/webfeeder-test-gen.el b/webfeeder-test-gen.el
new file mode 100644
index 0000000..c31fcc3
--- /dev/null
+++ b/webfeeder-test-gen.el
@@ -0,0 +1,121 @@
+;;; Commentary:
+;; Test resources should not be generated for it might render the test suite
+;; non-reproducible.  Indeed, the results of Org export depend on the version 
of
+;; Org.
+;;
+;; We only use this file to bootstrap the test resources.  The resources are
+;; then versioned to ensure their consistency.
+
+(require 'ox)
+(require 'webfeeder)
+(require 'webfeeder-test)
+
+;; Get rid of index.html~ and the like that pop up during generation.
+(setq make-backup-files nil)
+
+(defun webfeeder-test--export (input output)
+  (with-temp-buffer
+    (insert-file-contents input)
+    (org-export-to-file 'html output)))
+
+;; TODO: Namespace macro.
+(defmacro with-directory-excursion (dir &rest body)
+  (declare (indent defun))
+  `(progn
+     (mkdir ,dir 'parents)
+     (let ((default-directory ,default-directory))
+       (cd ,dir)
+       ,@body)))
+
+(defun webfeeder-test-gen-feeds ()
+  "Generate various feeds.
+We keep both libxml and default around to make sure our library
+can accommodate user's custom functions."
+  (with-directory-excursion webfeeder-test-dir
+    (cl-loop for (suffix builder) in '(("atom" webfeeder-make-atom)
+                                       ("rss" webfeeder-make-rss))
+             do
+             (let ((webfeeder-date-function 'webfeeder-date-libxml)
+                   (webfeeder-title-function 'webfeeder-title-libxml)
+                   (webfeeder-body-function 'webfeeder-body-libxml)
+                   (prefix "libxml"))
+               (webfeeder-build (format "%s-post0.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0-html5-fancy.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0))
+             (let ((webfeeder-date-function 'webfeeder-date-default)
+                   (webfeeder-title-function 'webfeeder-title-default)
+                   (webfeeder-body-function 'webfeeder-body-default)
+                   (prefix "default"))
+               (webfeeder-build (format "%s-post0.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0-html5-fancy.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0))
+             (let ((webfeeder-date-function 'webfeeder-date-libxml)
+                   (webfeeder-title-function 'webfeeder-title-libxml)
+                   (webfeeder-body-function 'webfeeder-body-libxml)
+                   (prefix "libxml"))
+               (webfeeder-build (format "%s-post0+post1.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0-html5-fancy.html" 
"post1-html5-fancy.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0))
+             (let ((webfeeder-date-function 'webfeeder-date-libxml)
+                   (webfeeder-title-function 'webfeeder-title-libxml)
+                   (webfeeder-body-function 'webfeeder-body-libxml)
+                   (prefix "libxml"))
+               (webfeeder-build (format "%s-post1.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0-html5-fancy.html" 
"post1-html5-fancy.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0
+                                   :max-entries 1))
+             (let ((webfeeder-date-function 'webfeeder-date-libxml)
+                   (webfeeder-title-function 'webfeeder-title-libxml)
+                   (webfeeder-body-function 'webfeeder-body-libxml)
+                   (prefix "libxml"))
+               (webfeeder-build (format "%s-post0-no-html.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0))
+             (let ((webfeeder-date-function 'webfeeder-date-libxml)
+                   (webfeeder-title-function 'webfeeder-title-libxml)
+                   (webfeeder-body-function 'webfeeder-body-libxml)
+                   (prefix "libxml"))
+               (webfeeder-build (format "%s-post0-no-fancy.%s" prefix suffix)
+                                   "." "https://example.org/";
+                                   '("post0-html5.html")
+                                   :builder builder
+                                   :title "Example feed"
+                                   :description "Example description"
+                                   :build-date 0)))))
+
+(defun webfeeder-test-gen ()
+  (with-directory-excursion webfeeder-test-dir
+    (dolist (post '("post0" "post1"))
+      (let ((org-input (format "%s.org" post)))
+        (let ((org-html-head-include-default-style nil)
+              (org-html-head-include-scripts nil))
+          (webfeeder-test--export org-input (format "%s.html" post)))
+        (let ((org-html-head-include-default-style nil)
+              (org-html-head-include-scripts nil)
+              (org-html-doctype "html5"))
+          (webfeeder-test--export org-input (format "%s-html5.html" post)))
+        (let ((org-html-head-include-default-style nil)
+              (org-html-head-include-scripts nil)
+              (org-html-doctype "html5")
+              (org-html-html5-fancy t))
+          (webfeeder-test--export org-input (format "%s-html5-fancy.html" 
post)))))))
diff --git a/webfeeder-test.el b/webfeeder-test.el
new file mode 100644
index 0000000..1966b91
--- /dev/null
+++ b/webfeeder-test.el
@@ -0,0 +1,198 @@
+(require 'ert)
+
+(add-to-list 'load-path ".")
+(require 'webfeeder)
+(require 'diff)
+(require 'cl-lib)
+
+(defvar webfeeder-test-dir "testdata")
+
+(defun webfeeder--file-to-string (file)
+  "Return the file content as string."
+  (with-temp-buffer
+    (insert-file-contents file)
+    (buffer-string)))
+
+(defun webfeeder--string=-explainer (string-a string-b)
+  "Return the diff output of STRING-A and STRING-B"
+  (unless (string= string-a string-b)
+    (let (file-a file-b)
+      (unwind-protect
+          (let (result)
+            (setq file-a (make-temp-file "webfeeder")
+                  file-b (make-temp-file "webfeeder"))
+            (with-temp-file file-a
+              (insert string-a))
+            (with-temp-file file-b
+              (insert string-b))
+            (setq result
+                  (with-temp-buffer
+                    ;; The following generates a *Diff* buffer which is
+                    ;; convenient for coloration.
+                    (diff file-a file-b nil 'no-async)
+                    (diff-no-select file-a file-b nil 'no-async 
(current-buffer))
+                    (buffer-string)))
+            result)
+        (delete-file file-a)
+        (delete-file file-b)))))
+
+(put 'string= 'ert-explainer 'webfeeder--string=-explainer)
+
+;; TODO: Make private.
+(defun webfeeder-test-pages (feed html-files
+                                     &optional builder max-entries)
+  (setq builder (or builder 'webfeeder-make-atom))
+  (let* ((feed-buffer (webfeeder--file-to-string feed))
+         (feed-items (webfeeder-html-files-to-items "." "https://example.org/";
+                                                       html-files)))
+    (should
+     (string=
+      feed-buffer
+      (funcall builder feed "https://example.org/"; feed-items
+               :title "Example feed"
+               :description "Example description"
+               :build-date 0
+               :max-entries max-entries)))
+    (should-not
+     (string=
+      feed-buffer
+      (funcall builder feed "https://example.org/"; feed-items
+                                 :title "Example TYPO"
+                                 :description "Example description"
+                                 :build-date 0
+                                 :max-entries max-entries)))
+    (should-not
+     (string=
+      feed-buffer
+      (funcall builder feed "https://example.XYZ/"; feed-items
+                                 :title "Example feed"
+                                 :description "Example description"
+                                 :build-date 0
+                                 :max-entries max-entries)))
+    (should-not
+     (string=
+      feed-buffer
+      (funcall builder feed "https://example.org/"; feed-items
+                                 :title "Example feed"
+                                 :description "Example description TYPO"
+                                 :build-date 0
+                                 :max-entries max-entries)))))
+
+;; TODO: Rename "page" to "rss".
+(ert-deftest webfeeder-single-page-libxml ()
+  "Simple test using libxml backend.
+This requires an Emacs compiled against libxml."
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0.rss" '("post0-html5-fancy.html")
+                               'webfeeder-make-rss))))
+
+(ert-deftest webfeeder-single-page-default ()
+  "Simple test using regular expressions to parse XML."
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-default)
+          (webfeeder-title-function 'webfeeder-title-default)
+          (webfeeder-body-function 'webfeeder-body-default))
+      (webfeeder-test-pages "default-post0.rss" '("post0-html5-fancy.html")
+                               'webfeeder-make-rss))))
+
+(ert-deftest webfeeder-multi-page-libxml ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0+post1.rss" '("post0-html5-fancy.html"
+                                                          
"post1-html5-fancy.html")
+                               'webfeeder-make-rss))))
+
+(ert-deftest webfeeder-limited-multi-rss-libxml ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post1.rss" '("post0-html5-fancy.html"
+                                                    "post1-html5-fancy.html")
+                               'webfeeder-make-rss 1))))
+
+(ert-deftest webfeeder-single-page-no-html5 ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0-no-html.rss" '("post0.html")
+                               'webfeeder-make-rss))))
+
+(ert-deftest webfeeder-single-page-no-fancy ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0-no-fancy.rss" '("post0-html5.html")
+                               'webfeeder-make-rss))))
+
+;; Atom tests.
+(ert-deftest webfeeder-single-atom-libxml ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0.atom" '("post0-html5-fancy.html")
+                                     'webfeeder-make-atom))))
+
+(ert-deftest webfeeder-single-atom-default ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-default)
+          (webfeeder-title-function 'webfeeder-title-default)
+          (webfeeder-body-function 'webfeeder-body-default))
+      (webfeeder-test-pages "default-post0.atom" '("post0-html5-fancy.html")
+                                     'webfeeder-make-atom))))
+
+(ert-deftest webfeeder-multi-atom-libxml ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0+post1.atom" 
'("post0-html5-fancy.html"
+                                                                
"post1-html5-fancy.html")
+                                     'webfeeder-make-atom))))
+
+(ert-deftest webfeeder-limited-multi-atom-libxml ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post1.atom" '("post0-html5-fancy.html"
+                                                    "post1-html5-fancy.html")
+                               'webfeeder-make-atom 1))))
+
+(ert-deftest webfeeder-single-atom-no-html5 ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0-no-html.atom" '("post0.html")
+                                     'webfeeder-make-atom))))
+
+(ert-deftest webfeeder-single-atom-no-fancy ()
+  (cl-assert (file-directory-p webfeeder-test-dir))
+  (let ((default-directory (expand-file-name webfeeder-test-dir 
default-directory)))
+    (let ((webfeeder-date-function 'webfeeder-date-libxml)
+          (webfeeder-title-function 'webfeeder-title-libxml)
+          (webfeeder-body-function 'webfeeder-body-libxml))
+      (webfeeder-test-pages "libxml-post0-no-fancy.atom" '("post0-html5.html")
+                                     'webfeeder-make-atom))))
+
+(provide 'webfeeder-test)
diff --git a/webfeeder.el b/webfeeder.el
new file mode 100644
index 0000000..0dcefd2
--- /dev/null
+++ b/webfeeder.el
@@ -0,0 +1,484 @@
+;;; webfeeder.el --- Build RSS and Atom webfeeds from HTML files -*- 
lexical-binding: t -*-
+
+;; Copyright (C) 2018, 2019 Pierre Neidhardt <address@hidden>
+
+;; Author: Pierre Neidhardt <address@hidden>
+;; Maintainer: Pierre Neidhardt <address@hidden>
+;; URL: https://gitlab.com/Ambrevar/emacs-webfeeder
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+;; Keywords: news, hypermedia, blog, feed, rss, atom
+
+;; This file is not part of GNU Emacs.
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; The entry point is `webfeeder-build': run it over a set of HTML files to
+;; produce the corresponding webfeed.
+;;
+;; See https://validator.w3.org/feed/ for an online validation service.
+
+;;; Code:
+
+(require 'rx)
+(require 'subr-x)
+(require 'dom)
+(require 'shr)                          ; TODO: Only with libxml?
+(require 'cl-lib)
+
+(defun webfeeder-has-libxml-p ()
+  (fboundp 'libxml-parse-html-region))
+
+(defvar webfeeder-author-function (if (webfeeder-has-libxml-p)
+                                         'webfeeder-author-libxml
+                                       'webfeeder-author-default)
+  "Function to fetch the author from an HTML file.")
+
+(defvar webfeeder-date-function (if (webfeeder-has-libxml-p)
+                                       'webfeeder-date-libxml
+                                       'webfeeder-date-default)
+  "Function to fetch the date from an HTML file.")
+
+(defvar webfeeder-title-function (if (webfeeder-has-libxml-p)
+                                       'webfeeder-title-libxml
+                                       'webfeeder-title-default)
+  "Function to fetch the title from an HTML file.")
+
+(defvar webfeeder-subtitle-function (if (webfeeder-has-libxml-p)
+                                           'webfeeder-subtitle-libxml
+                                         'webfeeder-subtitle-default)
+  "Function to fetch the subtitle from an HTML file.")
+
+(defvar webfeeder-body-function (if (webfeeder-has-libxml-p)
+                                       'webfeeder-body-libxml
+                                       'webfeeder-body-default)
+  "Function to fecth the HTML body.
+This can be customized to choose which part to include.")
+
+(defvar webfeeder-categories-function 'ignore
+  "Function to fecth the categories from the HTML.")
+
+(defvar webfeeder-generator-function (if (webfeeder-has-libxml-p)
+                                         'webfeeder-generator-libxml
+                                       'webfeeder-generator-default)
+  "Function to fetch the generator from an HTML file.")
+
+(defun webfeeder-author-default (html-file)
+  "Return the author from the HTML file."
+  (let ((case-fold-search t))
+    (with-temp-buffer
+      (insert-file-contents html-file)
+      (goto-char (point-min))
+      (search-forward-regexp (rx line-start "<meta name=\"author\" content=\"" 
(group (* (not (any "\"")))) "\""))
+      (match-string 1))))
+
+(defun webfeeder-author-libxml (html-file)
+  "Return the author from the HTML file.
+This uses libxml to parse."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (meta-tags (dom-by-tag dom 'meta)))
+      (cl-loop for (_meta ((_ . name-value) (_ . content-value))) in meta-tags
+               when (string= name-value "author")
+               return content-value))))
+
+(defun webfeeder-date-default (html-file)
+  "Return the date from the HTML file.
+The date is returned as time value.  See `current-time-string'."
+  (let ((case-fold-search t))
+    (with-temp-buffer
+      (insert-file-contents html-file)
+      (goto-char (point-min))
+      ;; TODO: Try with proper Org date.
+      (search-forward-regexp (rx line-start "<!-- " (group (* any)) " -->"))
+      (if (match-string 1)
+          (date-to-time
+           (concat (match-string 1) " DummyDateSuffix"))
+        0))))
+
+(defun webfeeder-date-libxml (html-file)
+  "Return the date from the HTML file.
+The date is returned as time value.  See `current-time-string'.
+This uses libxml to parse."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (date (dom-text (car (dom-by-class dom "date")))))
+      (date-to-time
+       (concat (or (and date
+                        (string-match (rx (group (repeat 4 digit) "-" (repeat 
2 digit) "-" (repeat 2 digit)))
+                                      date)
+                        (match-string 1 date))
+                   ;; Org publish adds a first comment with the timestamp.
+                   (dom-text (car (dom-by-tag dom 'comment))))
+               " DummyDateSuffix")))))
+
+(defun webfeeder-title-default (html-file)
+  "Return the title from the HTML file."
+  (let ((case-fold-search t))
+    (with-temp-buffer
+      (insert-file-contents html-file)
+      (goto-char (point-min))
+      (search-forward-regexp (rx line-start "<title>" (group (* (not (any 
"<")))) "</title>"))
+      (match-string 1))))
+
+(defun webfeeder-title-libxml (html-file)
+  "Return the title from the HTML file.
+This uses libxml to parse."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (title (dom-text (car (dom-by-tag dom 'title)))))
+      (if (string= "" title)
+          nil
+        title))))
+
+(defun webfeeder-subtitle-default (html-file)
+  "Return the subtitle from the HTML file."
+  (let ((case-fold-search t))
+    (with-temp-buffer
+      (insert-file-contents html-file)
+      (goto-char (point-min))
+      (search-forward-regexp (rx line-start "<span class=\"subtitle\">" (group 
(* (not (any "<")))) "</span>"))
+      (match-string 1))))
+
+(defun webfeeder-subtitle-libxml (html-file)
+  "Return the subtitle from the HTML file.
+This uses libxml to parse."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (subtitle (dom-text (car (dom-by-class dom "subtitle")))))
+      (if (string= "" subtitle)
+          nil
+        subtitle))))
+
+;; (insert (webfeeder-body-libxml 
"/home/ambrevar/projects/ambrevar.gitlab.io/webfeeder/post0-html5-fancy.html"))
+(defun webfeeder-body-libxml (html-file &optional _url exclude-toc)
+  "Return the HTML body as a string.
+Relative links are made absolute to URL.
+If EXCLUDE-TOC is non-nil, the table-of-contents is not included in the body."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           content)
+      (when exclude-toc
+        (let ((toc (or (dom-by-tag dom 'nav)
+                       ;; <nav> is only in HTML5.
+                       (dom-by-id dom "table-of-contents"))))
+          (dom-remove-node dom (car toc))))
+      (let ((title (or (dom-by-tag dom 'header)
+                       ;; The <header> is "fancy" HTML (as per Org 
designation).
+                       (dom-by-class dom "title"))))
+        (dom-remove-node dom (car title)))
+      (setq content (car (dom-by-id dom "content")))
+      (shr-dom-to-xml content))))
+
+(defun webfeeder-body-default (html-file &optional url exclude-toc)
+  "Return the HTML body as a string.
+Relative links are made absolute to URL.
+If EXCLUDE-TOC is non-nil, the table-of-contents is not included in the body."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    ;; TODO: Move to helper function.
+    ;; Better: See `org-html-link-use-abs-url'.
+    (goto-char (point-min))
+    (while (re-search-forward (rx "href=\"" (group (* (not (any "\"")))) "\"") 
nil t)
+      ;; Make relative links absolute.
+      (let ((match (match-string 1)))
+        (unless (string-match "://" match)
+          (goto-char (match-beginning 1))
+          (insert (concat (replace-regexp-in-string "/*$" "" url) "/"))
+          (goto-char (match-end 0)))))
+    (buffer-substring-no-properties
+     (progn
+       (goto-char (point-min))
+       (unless (and exclude-toc
+                    (search-forward "</nav>" nil 'noerror))
+         (goto-char (point-min))
+         (search-forward "</header>"))
+       (point))
+     (progn
+       (goto-char (point-max))
+       (search-backward "<div id=\"postamble\"")
+       (point)))))
+
+
+(defun webfeeder-generator-default (html-file)
+  "Return the generator from the HTML file."
+  (let ((case-fold-search t))
+    (with-temp-buffer
+      (insert-file-contents html-file)
+      (goto-char (point-min))
+      (search-forward-regexp (rx line-start "<meta name=\"generator\" 
content=\"" (group (* (not (any "\"")))) "\""))
+      (match-string 1))))
+
+(defun webfeeder-generator-libxml (html-file)
+  "Return the generator from the HTML file.
+This uses libxml to parse."
+  (with-temp-buffer
+    (insert-file-contents html-file)
+    (let* ((dom (libxml-parse-html-region (point-min) (point-max)))
+           (meta-tags (dom-by-tag dom 'meta)))
+      (cl-loop for (_meta ((_ . name-value) (_ . content-value))) in meta-tags
+               when (string= name-value "generator")
+               return content-value))))
+
+(defun webfeeder--date-to-rfc822 (date)
+  (format-time-string "%a, %d %b %Y %H:%M:%S %z" date))
+
+(defun webfeeder--date-to-rfc3339 (date)
+  (format-time-string "%FT%T%z" date))
+
+(defun webfeeder-item-to-rss (item)
+  "Return an RSS ITEM as a string.
+The item date is set to epoch if the item date is nil."
+  (concat
+   "<item>\n"
+   (when (webfeeder-item-author item)
+     (concat "  <author>" (webfeeder-item-author item) "</author>\n"))
+   "  <title>" (webfeeder-item-title item) "</title>\n"
+   (when (webfeeder-item-subtitle item)
+     (concat "  <comments>" (webfeeder-item-subtitle item) "</comments>\n"))
+   "  <description><![CDATA[" (webfeeder-item-body item) "]]></description>\n"
+   (when (webfeeder-item-categories item)
+     (mapconcat (lambda (cat) (concat "  <category>" cat "</category>"))
+                (webfeeder-item-categories item)
+                "\n"))
+   "  <link>" (webfeeder-item-url item) "</link>\n"
+   (format "  <guid isPermaLink=\"false\">%s</guid>\n" (webfeeder-item-url 
item))
+   "  <pubDate>"
+   (webfeeder--date-to-rfc822 (or (webfeeder-item-date item) 0))
+   "</pubDate>\n"
+   "</item>\n"))
+
+(defun webfeeder-item-to-atom (item)
+  "Return an atom ITEM as a string.
+The item date is set to epoch if the item date is nil."
+  (concat
+   "<entry>\n"
+   "  <title>" (webfeeder-item-title item) "</title>\n"
+   (when (webfeeder-item-author item)
+     (concat "  <author><name>" (webfeeder-item-author item) 
"</name></author>\n"))
+   (when (webfeeder-item-subtitle item)
+     (concat "  <summary>" (webfeeder-item-subtitle item) "</summary>\n"))
+   ;; TODO: Pros and cons if we could pass a "type" item to specify HTML or
+   ;; XHTML and remove CDATA?
+   ;; "  <content type=\"xhtml\"><![CDATA["
+   "  <content><![CDATA["
+   (webfeeder-item-body item)
+   "]]></content>\n"
+   (when (webfeeder-item-categories item)
+     (mapconcat (lambda (cat) (concat "  <category>" cat "</category>"))
+                (webfeeder-item-categories item)
+                "\n"))
+   "  <link>" (webfeeder-item-url item) "</link>\n"
+   "  <id>" (webfeeder-item-url item) "</id>\n"
+   "  <updated>"
+   (webfeeder--date-to-rfc3339 (or (webfeeder-item-date item) 0))
+   "</updated>\n"
+   "</entry>\n"))
+
+;; TODO: Set constructor?
+(cl-defstruct webfeeder-item
+  author
+  (date 0)
+  title
+  subtitle
+  body
+  url
+  categories
+  generator)
+
+;;;###autoload
+(defun webfeeder-html-files-to-items (project-dir url html-files)
+  "Parse the source HTML-FILES located in PROJECT-DIR and set to be hosted at 
URL.
+PROJECT-DIR is where HTML files are also assumed to reside.
+PROJECT-DIR is the local root of the website hosted at URL.
+HTML parsing details can be customized through the following
+variables:
+- `webfeeder-author-function'
+- `webfeeder-date-function'
+- `webfeeder-title-function'
+- `webfeeder-subtitle-function'
+- `webfeeder-body-function'.
+- `webfeeder-categories-function'.
+- `webfeeder-generator-function'."
+  (cl-loop for html-file in html-files
+           for dest = (expand-file-name html-file project-dir)
+           for feed-url = (concat (replace-regexp-in-string "/*$" "" url) "/" 
html-file)
+           for feed-author = (funcall webfeeder-author-function dest)
+           for feed-date = (or (funcall webfeeder-date-function
+                                        (expand-file-name html-file 
project-dir))
+                               0)
+           for feed-title = (or (funcall webfeeder-title-function dest) 
feed-url)
+           for feed-subtitle = (funcall webfeeder-subtitle-function dest)
+           for feed-body = (funcall webfeeder-body-function dest feed-url 
'exclude-toc)
+           for feed-categories = (funcall webfeeder-categories-function dest)
+           for feed-generator = (funcall webfeeder-generator-function dest)
+           collect (make-webfeeder-item :url feed-url
+                                           :author feed-author
+                                           :date feed-date
+                                           :title feed-title
+                                           :subtitle feed-subtitle
+                                           :body feed-body
+                                           :categories feed-categories
+                                           :generator feed-generator)))
+
+;;;###autoload
+(cl-defun webfeeder-make-rss (webfeed url feed-items
+                                         &key title description
+                                         author generator
+                                         build-date predicate max-entries
+                                         &allow-other-keys)
+  "Return a webfeed string in RSS format that contains every FEED-ITEMS.
+
+WEBFEED is the path where the feed is intended to be stored,
+relative to URL.
+
+A feed can have a TITLE and DESCRIPTION: if not, the URL will be
+used.
+
+When BUILD-DATE is nil, use `current-time'.  Otherwise it can be
+a time expression as in `current-time'.  0 means EPOCH.
+
+When provided, FEED-ITEMS are only added if (PREDICATE FEED-ITEM)
+returns non-nil.
+
+The number of items is limited to MAX-ENTRIES.  When nil, all
+items are included.
+
+FEED-ITEMS can be generated with `webfeeder-html-files-to-items'."
+  (setq title (or title url))
+  (with-temp-buffer
+    (insert "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
+            "<rss version=\"2.0\" 
xmlns:atom=\"http://www.w3.org/2005/Atom\";>\n"
+            "<channel>\n"
+            (if author
+                (concat "<author><name>" author "</name></author>\n")
+              "")
+            "<title>" title "</title>\n"
+            "<description>" (or description title) "</description>\n"
+            ;; TODO: Change generator name?
+            (concat "<generator>" (or generator "Emacs webfeeder.el") 
"</generator>\n")
+            "<link>" url "</link>\n"
+            (format "<atom:link href=\"%s/%s\" rel=\"self\" 
type=\"application/rss+xml\"/>\n"
+                    (string-trim-right url "/") webfeed)
+            "<lastBuildDate>" (webfeeder--date-to-rfc822 (or build-date 
(current-time)))
+            "</lastBuildDate>\n")
+    (cl-loop with sorted-item-list = (sort feed-items
+                                           (lambda (x y)
+                                             (time-less-p (webfeeder-item-date 
y)
+                                                          (webfeeder-item-date 
x))))
+             repeat (or max-entries (length sorted-item-list))
+             for item in sorted-item-list
+             do (when (or (not predicate) (funcall predicate item))
+                  (insert (webfeeder-item-to-rss item))))
+    (insert "</channel>\n"
+            "</rss>\n")
+    ;; TODO: Return buffer and not string?
+    (buffer-string)))
+
+;;;###autoload
+(cl-defun webfeeder-make-atom (webfeed url feed-items
+                                          &key title subtitle description
+                                          author generator
+                                          build-date predicate max-entries
+                                          &allow-other-keys)
+  "Return a webfeed string in Atom format that contains every FEED-ITEMS.
+
+WEBFEED is the path where the feed is intended to be stored,
+relative to URL.
+
+A feed can have a TITLE and DESCRIPTION: if not, the URL will be
+used.
+
+When BUILD-DATE is nil, use `current-time'.  Otherwise it can be
+a time expression as in `current-time'.  0 means EPOCH.
+
+When provided, FEED-ITEMS are only added if (PREDICATE FEED-ITEM)
+returns non-nil.
+
+The number of items is limited to MAX-ENTRIES.  When nil, all
+items are included.
+
+FEED-ITEMS can be generated with `webfeeder-html-files-to-items'."
+  (setq title (or title url))
+  (with-temp-buffer
+    (let ((path (concat (string-trim-right url "/") "/" webfeed)))
+      (insert "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"
+              "<feed xmlns=\"http://www.w3.org/2005/Atom\";>"
+              (if author
+                  (concat "<author><name>" author "</name></author>\n")
+                "")
+              "<title>" title "</title>\n"
+              (if subtitle
+                  (concat "<subtitle>" subtitle "</subtitle>\n")
+                "")
+              "<summary>" (or description title) "</summary>\n"
+              ;; TODO: Change generator name?
+              (concat "<generator>" (or generator "Emacs webfeeder.el") 
"</generator>\n")
+              "<link href=\"" url "\">\n"
+              (format "<link href=\"%s\" rel=\"self\"/>\n"
+                      path)
+              ;; REVIEW: Use UUID?
+              "<id>" path "</id>\n"
+              ;; TODO: Publishing date?  Org create two "date" classes, not
+              ;; really distinguishable.
+              "<updated>" (webfeeder--date-to-rfc3339 (or build-date 
(current-time)))
+              "</updated>\n"))
+    (cl-loop with sorted-item-list = (sort feed-items
+                                           (lambda (x y)
+                                             (time-less-p (webfeeder-item-date 
y)
+                                                          (webfeeder-item-date 
x))))
+             repeat (or max-entries (length sorted-item-list))
+             for item in sorted-item-list
+             do (when (or (not predicate) (funcall predicate item))
+                  (insert (webfeeder-item-to-atom item))))
+    (insert "</feed>\n")
+    (buffer-string)))
+
+;;;###autoload
+(cl-defun webfeeder-build (webfeed project-dir url html-files
+                                      &key title subtitle description
+                                      author generator
+                                      build-date predicate max-entries
+                                      (builder 'webfeeder-make-atom))
+  "Build a WEBFEED out of HTML-FILES.
+The WEBFEED is an XML file that contains every blog post in a
+machine-readable format.
+
+The WEBFEED file is stored in PROJECT-DIR where HTML-FILES are
+also assumed to reside.
+
+For more details on the other arguments, see
+`webfeeder-make-atom', `webfeeder-make-rss' and
+`webfeeder-html-files-to-items'."
+  (let ((feed-items (webfeeder-html-files-to-items project-dir url 
html-files)))
+    (with-temp-file (expand-file-name webfeed project-dir)
+      (insert (funcall builder webfeed url feed-items
+               :author author
+               :title title
+               :subtitle subtitle
+               :description description
+               :generator generator
+               :build-date build-date
+               :predicate predicate
+               :max-entries max-entries)))))
+
+(provide 'webfeeder)
+;;; webfeeder.el ends here