2013-03-15 11:29:16 -04:00
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;;; ox-rss.el --- RSS 2.0 Back-End for Org Export Engine
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2014-01-07 08:18:17 -05:00
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;; Copyright (C) 2013, 2014 Bastien Guerry
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2013-03-15 11:29:16 -04:00
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2013-10-08 02:07:21 -04:00
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;; Author: Bastien Guerry <bzg@gnu.org>
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2013-03-15 11:29:16 -04:00
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;; Keywords: org, wp, blog, feed, rss
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;; This file is not yet part of GNU Emacs.
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;; This program is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:
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;; This library implements a RSS 2.0 back-end for Org exporter, based on
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;; the `html' back-end.
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;;
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2013-07-10 05:53:14 -04:00
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;; It requires Emacs 24.1 at least.
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;;
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2013-03-15 11:29:16 -04:00
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;; It provides two commands for export, depending on the desired output:
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;; `org-rss-export-as-rss' (temporary buffer) and `org-rss-export-to-rss'
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;; (as a ".xml" file).
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;;
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;; This backend understands two new option keywords:
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;;
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;; #+RSS_EXTENSION: xml
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;; #+RSS_IMAGE_URL: http://myblog.org/mypicture.jpg
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;;
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;; It uses #+HTML_LINK_HOME: to set the base url of the feed.
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;;
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;; Exporting an Org file to RSS modifies each top-level entry by adding a
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;; PUBDATE property. If `org-rss-use-entry-url-as-guid', it will also add
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;; an ID property, later used as the guid for the feed's item.
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;;
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;; You typically want to use it within a publishing project like this:
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;;
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;; (add-to-list
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;; 'org-publish-project-alist
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;; '("homepage_rss"
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;; :base-directory "~/myhomepage/"
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;; :base-extension "org"
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;; :rss-image-url "http://lumiere.ens.fr/~guerry/images/faces/15.png"
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2013-06-27 10:39:37 -04:00
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;; :html-link-home "http://lumiere.ens.fr/~guerry/"
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2013-09-06 01:41:59 -04:00
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;; :html-link-use-abs-url t
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;; :rss-extension "xml"
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;; :publishing-directory "/home/guerry/public_html/"
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;; :publishing-function (org-rss-publish-to-rss)
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;; :section-numbers nil
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;; :exclude ".*" ;; To exclude all files...
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;; :include ("index.org") ;; ... except index.org.
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;; :table-of-contents nil))
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;;
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;; ... then rsync /home/guerry/public_html/ with your server.
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2013-07-23 12:51:45 -04:00
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;;
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;; By default, the permalink for a blog entry points to the headline.
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;; You can specify a different one by using the :RSS_PERMALINK:
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;; property within an entry.
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2013-03-15 11:29:16 -04:00
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;;; Code:
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(require 'ox-html)
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(declare-function url-encode-url "url-util" (url))
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;;; Variables and options
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(defgroup org-export-rss nil
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"Options specific to RSS export back-end."
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:tag "Org RSS"
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:group 'org-export
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:version "24.4"
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:package-version '(Org . "8.0"))
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2013-03-15 11:45:26 -04:00
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(defcustom org-rss-image-url "http://orgmode.org/img/org-mode-unicorn-logo.png"
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"The URL of the an image for the RSS feed."
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:group 'org-export-rss
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:type 'string)
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(defcustom org-rss-extension "xml"
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"File extension for the RSS 2.0 feed."
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:group 'org-export-rss
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:type 'string)
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(defcustom org-rss-categories 'from-tags
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"Where to extract items category information from.
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The default is to extract categories from the tags of the
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headlines. When set to another value, extract the category
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from the :CATEGORY: property of the entry."
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:group 'org-export-rss
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:type '(choice
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(const :tag "From tags" from-tags)
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(const :tag "From the category property" from-category)))
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(defcustom org-rss-use-entry-url-as-guid t
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"Use the URL for the <guid> metatag?
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When nil, Org will create ids using `org-icalendar-create-uid'."
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:group 'org-export-rss
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:type 'boolean)
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;;; Define backend
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2013-03-19 11:26:30 -04:00
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(org-export-define-derived-backend 'rss 'html
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2013-03-15 11:29:16 -04:00
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:menu-entry
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2013-03-19 11:26:30 -04:00
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'(?r "Export to RSS"
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((?R "As RSS buffer"
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(lambda (a s v b) (org-rss-export-as-rss a s v)))
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(?r "As RSS file" (lambda (a s v b) (org-rss-export-to-rss a s v)))
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(?o "As RSS file and open"
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(lambda (a s v b)
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(if a (org-rss-export-to-rss t s v)
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(org-open-file (org-rss-export-to-rss nil s v)))))))
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2013-03-15 11:29:16 -04:00
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:options-alist
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2013-03-19 11:26:30 -04:00
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'((:with-toc nil nil nil) ;; Never include HTML's toc
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(:rss-extension "RSS_EXTENSION" nil org-rss-extension)
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(:rss-image-url "RSS_IMAGE_URL" nil org-rss-image-url)
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(:rss-categories nil nil org-rss-categories))
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:filters-alist '((:filter-final-output . org-rss-final-function))
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:translate-alist '((headline . org-rss-headline)
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(comment . (lambda (&rest args) ""))
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(comment-block . (lambda (&rest args) ""))
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(timestamp . (lambda (&rest args) ""))
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(plain-text . org-rss-plain-text)
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(section . org-rss-section)
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(template . org-rss-template)))
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2013-03-15 11:29:16 -04:00
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;;; Export functions
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;;;###autoload
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(defun org-rss-export-as-rss (&optional async subtreep visible-only)
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"Export current buffer to a RSS buffer.
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If narrowing is active in the current buffer, only export its
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narrowed part.
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If a region is active, export that region.
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A non-nil optional argument ASYNC means the process should happen
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asynchronously. The resulting buffer should be accessible
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through the `org-export-stack' interface.
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When optional argument SUBTREEP is non-nil, export the sub-tree
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at point, extracting information from the headline properties
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first.
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When optional argument VISIBLE-ONLY is non-nil, don't export
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contents of hidden elements.
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Export is done in a buffer named \"*Org RSS Export*\", which will
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be displayed when `org-export-show-temporary-export-buffer' is
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non-nil."
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(interactive)
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(let ((file (buffer-file-name (buffer-base-buffer))))
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(org-icalendar-create-uid file 'warn-user)
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(org-rss-add-pubdate-property))
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Export back-ends: Apply changes to export functions
* contrib/lisp/ox-confluence.el (org-confluence-export-as-confluence):
* contrib/lisp/ox-deck.el (org-deck-export-as-html,
org-deck-export-to-html):
* contrib/lisp/ox-freemind.el (org-freemind-export-to-freemind):
* contrib/lisp/ox-groff.el (org-groff-export-to-groff,
org-groff-export-to-pdf):
* contrib/lisp/ox-koma-letter.el (org-koma-letter-export-as-latex,
org-koma-letter-export-to-latex, org-koma-letter-export-to-pdf):
* contrib/lisp/ox-rss.el (org-rss-export-as-rss,
org-rss-export-to-rss):
* contrib/lisp/ox-s5.el (org-s5-export-as-html,
org-s5-export-to-html):
* contrib/lisp/ox-taskjuggler.el (org-taskjuggler-export):
* lisp/ob-haskell.el:
* lisp/ox-ascii.el (org-ascii-export-as-ascii,
org-ascii-export-to-ascii):
* lisp/ox-beamer.el (org-beamer-export-as-latex,
org-beamer-export-to-latex, org-beamer-export-to-pdf):
* lisp/ox-html.el (org-html-export-as-html, org-html-export-to-html):
* lisp/ox-icalendar.el (org-icalendar-export-to-ics):
* lisp/ox-latex.el (org-latex-export-as-latex,
org-latex-export-to-pdf):
* lisp/ox-man.el (org-man-export-to-man, org-man-export-to-pdf):
* lisp/ox-md.el (org-md-export-as-markdown,
org-md-export-to-markdown):
* lisp/ox-odt.el (org-odt-export-to-odt):
* lisp/ox-org.el (org-org-export-as-org, org-org-export-to-org):
* lisp/ox-publish.el (org-publish-org-to):
* lisp/ox-texinfo.el (org-texinfo-export-to-texinfo,
org-texinfo-export-to-info):
* testing/lisp/test-ob-exp.el (test-ob-exp/org-babel-exp-src-blocks/w-no-file):
2013-08-07 04:35:42 -04:00
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(org-export-to-buffer 'rss "*Org RSS Export*"
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async subtreep visible-only nil nil (lambda () (text-mode))))
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2013-03-15 11:29:16 -04:00
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;;;###autoload
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(defun org-rss-export-to-rss (&optional async subtreep visible-only)
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"Export current buffer to a RSS file.
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If narrowing is active in the current buffer, only export its
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narrowed part.
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If a region is active, export that region.
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A non-nil optional argument ASYNC means the process should happen
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asynchronously. The resulting file should be accessible through
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the `org-export-stack' interface.
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When optional argument SUBTREEP is non-nil, export the sub-tree
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at point, extracting information from the headline properties
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first.
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When optional argument VISIBLE-ONLY is non-nil, don't export
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contents of hidden elements.
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Return output file's name."
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(interactive)
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(let ((file (buffer-file-name (buffer-base-buffer))))
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(org-icalendar-create-uid file 'warn-user)
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(org-rss-add-pubdate-property))
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(let ((outfile (org-export-output-file-name
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(concat "." org-rss-extension) subtreep)))
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Export back-ends: Apply changes to export functions
* contrib/lisp/ox-confluence.el (org-confluence-export-as-confluence):
* contrib/lisp/ox-deck.el (org-deck-export-as-html,
org-deck-export-to-html):
* contrib/lisp/ox-freemind.el (org-freemind-export-to-freemind):
* contrib/lisp/ox-groff.el (org-groff-export-to-groff,
org-groff-export-to-pdf):
* contrib/lisp/ox-koma-letter.el (org-koma-letter-export-as-latex,
org-koma-letter-export-to-latex, org-koma-letter-export-to-pdf):
* contrib/lisp/ox-rss.el (org-rss-export-as-rss,
org-rss-export-to-rss):
* contrib/lisp/ox-s5.el (org-s5-export-as-html,
org-s5-export-to-html):
* contrib/lisp/ox-taskjuggler.el (org-taskjuggler-export):
* lisp/ob-haskell.el:
* lisp/ox-ascii.el (org-ascii-export-as-ascii,
org-ascii-export-to-ascii):
* lisp/ox-beamer.el (org-beamer-export-as-latex,
org-beamer-export-to-latex, org-beamer-export-to-pdf):
* lisp/ox-html.el (org-html-export-as-html, org-html-export-to-html):
* lisp/ox-icalendar.el (org-icalendar-export-to-ics):
* lisp/ox-latex.el (org-latex-export-as-latex,
org-latex-export-to-pdf):
* lisp/ox-man.el (org-man-export-to-man, org-man-export-to-pdf):
* lisp/ox-md.el (org-md-export-as-markdown,
org-md-export-to-markdown):
* lisp/ox-odt.el (org-odt-export-to-odt):
* lisp/ox-org.el (org-org-export-as-org, org-org-export-to-org):
* lisp/ox-publish.el (org-publish-org-to):
* lisp/ox-texinfo.el (org-texinfo-export-to-texinfo,
org-texinfo-export-to-info):
* testing/lisp/test-ob-exp.el (test-ob-exp/org-babel-exp-src-blocks/w-no-file):
2013-08-07 04:35:42 -04:00
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(org-export-to-file 'rss outfile async subtreep visible-only)))
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2013-03-15 11:29:16 -04:00
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;;;###autoload
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(defun org-rss-publish-to-rss (plist filename pub-dir)
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"Publish an org file to RSS.
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FILENAME is the filename of the Org file to be published. PLIST
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is the property list for the given project. PUB-DIR is the
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publishing directory.
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Return output file name."
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2013-07-03 05:32:13 -04:00
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(let ((bf (get-file-buffer filename)))
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(if bf
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(with-current-buffer bf
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(org-rss-add-pubdate-property)
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(write-file filename))
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(find-file filename)
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(org-rss-add-pubdate-property)
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2013-07-04 12:37:55 -04:00
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(write-file filename) (kill-buffer)))
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2013-03-15 11:45:26 -04:00
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(org-publish-org-to
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'rss filename (concat "." org-rss-extension) plist pub-dir))
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2013-03-15 11:29:16 -04:00
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;;; Main transcoding functions
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(defun org-rss-headline (headline contents info)
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"Transcode HEADLINE element into RSS format.
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CONTENTS is the headline contents. INFO is a plist used as a
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communication channel."
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(unless (or (org-element-property :footnote-section-p headline)
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;; Only consider first-level headlines
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(> (org-export-get-relative-level headline info) 1))
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(let* ((htmlext (plist-get info :html-extension))
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(hl-number (org-export-get-headline-number headline info))
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2013-07-23 12:51:45 -04:00
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(hl-home (file-name-as-directory (plist-get info :html-link-home)))
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(hl-pdir (plist-get info :publishing-directory))
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2013-07-24 04:28:11 -04:00
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(hl-perm (org-element-property :RSS_PERMALINK headline))
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2013-03-15 11:29:16 -04:00
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(anchor
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(org-export-solidify-link-text
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(or (org-element-property :CUSTOM_ID headline)
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(concat "sec-" (mapconcat 'number-to-string hl-number "-")))))
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(category (org-rss-plain-text
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(or (org-element-property :CATEGORY headline) "") info))
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2013-03-19 05:35:50 -04:00
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(pubdate
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(let ((system-time-locale "C"))
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(format-time-string
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2013-11-04 18:14:03 -05:00
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"%a, %d %b %Y %H:%M:%S %z"
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2013-03-19 05:35:50 -04:00
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(org-time-string-to-time
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(or (org-element-property :PUBDATE headline)
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(error "Missing PUBDATE property"))))))
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2014-03-24 01:27:31 -04:00
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(title (replace-regexp-in-string
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org-bracket-link-regexp
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(lambda (m) (or (match-string 3 m)
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(match-string 1 m)))
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(org-element-property :raw-value headline)))
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2013-03-15 11:29:16 -04:00
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(publink
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2013-07-24 04:28:11 -04:00
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(or (and hl-perm (concat (or hl-home hl-pdir) hl-perm))
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2013-07-23 12:51:45 -04:00
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(concat
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(or hl-home hl-pdir)
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(file-name-nondirectory
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(file-name-sans-extension
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2013-07-24 04:28:11 -04:00
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(plist-get info :input-file))) "." htmlext "#" anchor)))
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2013-03-15 11:29:16 -04:00
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(guid (if org-rss-use-entry-url-as-guid
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publink
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(org-rss-plain-text
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(or (org-element-property :ID headline)
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(org-element-property :CUSTOM_ID headline)
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publink)
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info))))
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(format
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(concat
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"<item>\n"
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"<title>%s</title>\n"
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"<link>%s</link>\n"
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"<guid isPermaLink=\"false\">%s</guid>\n"
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"<pubDate>%s</pubDate>\n"
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(org-rss-build-categories headline info) "\n"
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"<description><![CDATA[%s]]></description>\n"
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"</item>\n")
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title publink guid pubdate contents))))
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(defun org-rss-build-categories (headline info)
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"Build categories for the RSS item."
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(if (eq (plist-get info :rss-categories) 'from-tags)
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(mapconcat
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(lambda (c) (format "<category><![CDATA[%s]]></category>" c))
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(org-element-property :tags headline)
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"\n")
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(let ((c (org-element-property :CATEGORY headline)))
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(format "<category><![CDATA[%s]]></category>" c))))
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(defun org-rss-template (contents info)
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|
"Return complete document string after RSS conversion.
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|
CONTENTS is the transcoded contents string. INFO is a plist used
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|
as a communication channel."
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(concat
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(format "<?xml version=\"1.0\" encoding=\"%s\"?>"
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|
(symbol-name org-html-coding-system))
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"\n<rss version=\"2.0\"
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xmlns:content=\"http://purl.org/rss/1.0/modules/content/\"
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xmlns:wfw=\"http://wellformedweb.org/CommentAPI/\"
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xmlns:dc=\"http://purl.org/dc/elements/1.1/\"
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xmlns:atom=\"http://www.w3.org/2005/Atom\"
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xmlns:sy=\"http://purl.org/rss/1.0/modules/syndication/\"
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xmlns:slash=\"http://purl.org/rss/1.0/modules/slash/\"
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xmlns:georss=\"http://www.georss.org/georss\"
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|
xmlns:geo=\"http://www.w3.org/2003/01/geo/wgs84_pos#\"
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|
xmlns:media=\"http://search.yahoo.com/mrss/\">"
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|
"<channel>"
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|
|
(org-rss-build-channel-info info) "\n"
|
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|
|
contents
|
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|
|
"</channel>\n"
|
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|
|
"</rss>"))
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|
(defun org-rss-build-channel-info (info)
|
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|
|
"Build the RSS channel information."
|
|
|
|
(let* ((system-time-locale "C")
|
2013-06-27 12:57:09 -04:00
|
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|
(title (plist-get info :title))
|
2013-03-15 11:29:16 -04:00
|
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|
(email (org-export-data (plist-get info :email) info))
|
|
|
|
(author (and (plist-get info :with-author)
|
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|
|
(let ((auth (plist-get info :author)))
|
|
|
|
(and auth (org-export-data auth info)))))
|
2013-11-04 18:14:03 -05:00
|
|
|
(date (format-time-string "%a, %d %b %Y %H:%M:%S %z")) ;; RFC 882
|
2013-03-15 11:29:16 -04:00
|
|
|
(description (org-export-data (plist-get info :description) info))
|
|
|
|
(lang (plist-get info :language))
|
|
|
|
(keywords (plist-get info :keywords))
|
|
|
|
(rssext (plist-get info :rss-extension))
|
|
|
|
(blogurl (or (plist-get info :html-link-home)
|
|
|
|
(plist-get info :publishing-directory)))
|
|
|
|
(image (url-encode-url (plist-get info :rss-image-url)))
|
2013-07-24 04:28:11 -04:00
|
|
|
(ifile (plist-get info :input-file))
|
2013-03-15 11:29:16 -04:00
|
|
|
(publink
|
|
|
|
(concat (file-name-as-directory blogurl)
|
2014-03-24 01:27:31 -04:00
|
|
|
(file-name-nondirectory
|
|
|
|
(file-name-sans-extension ifile))
|
2013-03-15 11:29:16 -04:00
|
|
|
"." rssext)))
|
|
|
|
(format
|
|
|
|
"\n<title>%s</title>
|
|
|
|
<atom:link href=\"%s\" rel=\"self\" type=\"application/rss+xml\" />
|
|
|
|
<link>%s</link>
|
|
|
|
<description><![CDATA[%s]]></description>
|
|
|
|
<language>%s</language>
|
|
|
|
<pubDate>%s</pubDate>
|
|
|
|
<lastBuildDate>%s</lastBuildDate>
|
|
|
|
<generator>%s</generator>
|
2013-06-27 10:39:37 -04:00
|
|
|
<webMaster>%s (%s)</webMaster>
|
2013-03-15 11:29:16 -04:00
|
|
|
<image>
|
|
|
|
<url>%s</url>
|
|
|
|
<title>%s</title>
|
|
|
|
<link>%s</link>
|
|
|
|
</image>
|
|
|
|
"
|
|
|
|
title publink blogurl description lang date date
|
|
|
|
(concat (format "Emacs %d.%d"
|
|
|
|
emacs-major-version
|
|
|
|
emacs-minor-version)
|
|
|
|
" Org-mode " (org-version))
|
2013-06-27 10:39:37 -04:00
|
|
|
email author image title blogurl)))
|
2013-03-15 11:29:16 -04:00
|
|
|
|
|
|
|
(defun org-rss-section (section contents info)
|
|
|
|
"Transcode SECTION element into RSS format.
|
|
|
|
CONTENTS is the section contents. INFO is a plist used as
|
|
|
|
a communication channel."
|
|
|
|
contents)
|
|
|
|
|
|
|
|
(defun org-rss-timestamp (timestamp contents info)
|
|
|
|
"Transcode a TIMESTAMP object from Org to RSS.
|
|
|
|
CONTENTS is nil. INFO is a plist holding contextual
|
|
|
|
information."
|
|
|
|
(org-html-encode-plain-text
|
|
|
|
(org-timestamp-translate timestamp)))
|
|
|
|
|
|
|
|
(defun org-rss-plain-text (contents info)
|
|
|
|
"Convert plain text into RSS encoded text."
|
|
|
|
(let (output)
|
|
|
|
(setq output (org-html-encode-plain-text contents)
|
|
|
|
output (org-export-activate-smart-quotes
|
|
|
|
output :html info))))
|
|
|
|
|
|
|
|
;;; Filters
|
|
|
|
|
|
|
|
(defun org-rss-final-function (contents backend info)
|
|
|
|
"Prettify the RSS output."
|
|
|
|
(with-temp-buffer
|
|
|
|
(xml-mode)
|
|
|
|
(insert contents)
|
|
|
|
(indent-region (point-min) (point-max))
|
|
|
|
(buffer-substring-no-properties (point-min) (point-max))))
|
|
|
|
|
|
|
|
;;; Miscellaneous
|
|
|
|
|
|
|
|
(defun org-rss-add-pubdate-property ()
|
|
|
|
"Set the PUBDATE property for top-level headlines."
|
|
|
|
(let (msg)
|
|
|
|
(org-map-entries
|
|
|
|
(lambda ()
|
|
|
|
(let* ((entry (org-element-at-point))
|
|
|
|
(level (org-element-property :level entry)))
|
|
|
|
(when (= level 1)
|
|
|
|
(unless (org-entry-get (point) "PUBDATE")
|
|
|
|
(setq msg t)
|
|
|
|
(org-set-property
|
2013-03-19 05:35:50 -04:00
|
|
|
"PUBDATE" (format-time-string
|
|
|
|
(cdr org-time-stamp-formats)))))))
|
2013-03-15 11:29:16 -04:00
|
|
|
nil nil 'comment 'archive)
|
|
|
|
(when msg
|
|
|
|
(message "Property PUBDATE added to top-level entries in %s"
|
|
|
|
(buffer-file-name))
|
|
|
|
(sit-for 2))))
|
|
|
|
|
2013-03-15 11:53:06 -04:00
|
|
|
(provide 'ox-rss)
|
|
|
|
|
2013-03-15 11:29:16 -04:00
|
|
|
;;; ox-rss.el ends here
|