specifying (at the minimum) a title, a permanent link and the content
of the entry. Text-only, HTML and XHTML entries are supported.
-The code for this library is hosted at http://code.fperrin.net/atom.git.
+The code for this library is hosted at [[http://code.tar-jx.bz/atom.git]];
+this manual can be found at [[http://tar-jx.bz/code/atom.html]].
* Installation
The feed is created with =atom-create=, giving it a title and a Web
address at the minimum. Entries may then be added one by one with
-=atom-add-{text,html,xhtml}-entry=.
+=atom-add-{text, html, xhtml}-entry=.
A typical usage would look like this:
;; A simple, text-only entry
(atom-add-text-entry
my-atom-feed
- "Hello world"
- "http://example.org/hello"
- "Hello the world!")
+ "Hello world" ; Title
+ "http://example.org/hello" ; Permalink of the entry
+ "Hello the world!") ; Content of the entry
;; A text-only entry, with all the optional pieces of data
(atom-add-text-entry
(atom-print my-atom-feed))
#+END_SRC
-* Additionnal notes
+See the docstrings for the methods above for more details.
+
+* Additional notes
+
+** If what you want to do is not possible here
The =my-atom-feed= object in the example above is really only an XML
tree as defined by the =xml.el= package. This means you can manipulate
-it, as long as you are careful not to mess up the XML structure. For
+it, as long as you are careful when manipulating the XML structure. For
instance, if you want to add somebody as a contributor to an entry,
-you could say the following:
+and also add an =lang= attribute, you could say the following:
#+BEGIN_SRC elisp
(let ((entry (atom-add-html-entry my-atom-feed
"http://example.org/witty"
"<p>This is <i>clever</i>, isn't it?")))
(atom-modify-entry entry 'contributor
- (atom-massage-author '("John Clever" "jc@example.net"))))
+ (atom-massage-author '("John Clever" "jc@example.net")))
+ (let* ((attrs (xml-node-attributes entry)))
+ (setcar (cdr entry) (cons '(lang . "en") attrs))))
#+END_SRC
+** Conformingness of produced feeds
+
As of now, the library doesn't check whether there are two entries
with the same =id= value (which is illegal), or with the same
=updated= value (which reportedly confuse some readers).
+
+The encoding of the resulting feed is hard-coded to UTF-8.
+
+** Outputting RSS feeds
+
+Use =atom-to-rss-print= and =atom-to-rss-write-file=.
+
+Producing RSS from Atom feeds is not optimal. In particular :
+
+- the =updated= and the =pubDate= in the two standards don't seem to
+ have the same semantics (last meaningfull change VS publication of
+ the entry) ;
+
+- the =description= of the channel is mandatory in RSS. The value for
+ this element is taken from the =subtitle= element of an Atom feed,
+ which is optional, so this library may produce non conforming RSS
+ feeds.
+
+** XHTML entries
+
+According to the w3c, relative links in an Atom feed can confuse feed
+readers. As a result, this library's default behaviour is to translate
+all addresses in the =href= attribute of =a= elements and =src= of
+=img= to absolute links. This can be disabled by setting NOCONVERT to
+t when calling =atom-add-xhtml-entry=.
+
+In the =pre= element, whitespace is significant. However,
+=xml-parse-region= then =xml-print= will add spaces and
+identation. This is not something that can be fixed from =atom.el=.
+
+If you already have your XHTML content in Lisp format (as opposed to
+simply a long string), you can pass it directly, as in:
+
+#+BEGIN_SRC elisp
+ (atom-add-xhtml-entry
+ my-atom-feed
+ "An XHTML example"
+ "http://example.org/emacs-haiku"
+ '((h1 nil "Emacs Haiku")
+ (p nil "The friends chat gaily," (br)
+ "I stand up to join their talk." (br)
+ "My save-excursion." (br))
+ (p ((class . "author-name")) nil "Oliver Scholz")))
+#+END_SRC
+
+This will save a call to =xml-parse-region=.
+
+* License
+
+=atom.el= -- An elisp library for creating Atom feeds.
+Copyright (C) 2011 Frédéric Perrin.
+
+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.
+
+The full text of the GNU General Public License can be found at the
+following address: <http://www.gnu.org/licenses/gpl-3.0.txt>