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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