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;;; org-special-blocks.el --- Turn blocks into LaTeX envs and HTML divs
;; Copyright (C) 2009 Chris Gray
;; Author: Chris Gray <chrismgray@gmail.com>
;; This file is not currently 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 2, 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 ; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;;
;; This package generalizes the #+begin_foo and #+end_foo tokens.
;; To use, put the following in your init file:
;;
;; (require 'org-special-blocks)
;; The tokens #+begin_center, #+begin_verse, etc. existed previously.
;; This package generalizes them (at least for the LaTeX and html
;; exporters). When a #+begin_foo token is encountered by the LaTeX
;; exporter, it is expanded into \begin{foo}. The text inside the
;; environment is not protected, as text inside environments generally
;; is. When #+begin_foo is encountered by the html exporter, a div
;; with class foo is inserted into the HTML file. It is up to the
;; user to add this class to his or her stylesheet if this div is to
;; mean anything.
(defvar org-special-blocks-ignore-regexp "^\\(LaTeX\\|HTML\\)$"
"A regexp indicating the names of blocks that should be ignored
by org-special-blocks. These blocks will presumably be
interpreted by other mechanisms.")
(defun org-special-blocks-make-special-cookies ()
"Adds special cookies when #+begin_foo and #+end_foo tokens are
seen. This is run after a few special cases are taken care of."
(when (or htmlp latexp)
(goto-char (point-min))
(while (re-search-forward "^[ \t]*#\\+\\(begin\\|end\\)_\\(.*\\)$" nil t)
(unless (org-string-match-p org-special-blocks-ignore-regexp (match-string 2))
(replace-match
(if (equal (downcase (match-string 1)) "begin")
(concat "ORG-" (match-string 2) "-START")
(concat "ORG-" (match-string 2) "-END"))
t t)))))
(add-hook 'org-export-preprocess-after-blockquote-hook
'org-special-blocks-make-special-cookies)
(defun org-special-blocks-convert-latex-special-cookies ()
"Converts the special cookies into LaTeX blocks."
(goto-char (point-min))
(while (re-search-forward "^ORG-\\([^ \t\n]*\\)[ \t]*\\(.*\\)-\\(START\\|END\\)$" nil t)
(replace-match
(if (equal (match-string 3) "START")
(concat "\\begin{" (match-string 1) "}" (match-string 2))
(concat "\\end{" (match-string 1) "}"))
t t)))
(add-hook 'org-export-latex-after-blockquotes-hook
'org-special-blocks-convert-latex-special-cookies)
(defun org-special-blocks-convert-html-special-cookies ()
"Converts the special cookies into div blocks."
;; Uses the dynamically-bound variable `line'.
(when (string-match "^ORG-\\(.*\\)-\\(START\\|END\\)$" line)
; (org-close-par-maybe)
(message "%s" (match-string 1))
(if (equal (match-string 2 line) "START")
(insert "<div class=\"" (match-string 1 line) "\">\n")
(insert "</div>\n"))
(throw 'nextline nil)))
(add-hook 'org-export-html-after-blockquotes-hook
'org-special-blocks-convert-html-special-cookies)
(provide 'org-special-blocks)
;;; org-special-blocks.el ends here
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