lisp/org/org-beamer.el

   1 ;;; org-beamer.el --- Beamer-specific LaTeX export for org-mode
   2 ;;
   3 ;; Copyright (C) 2007-2011 Free Software Foundation, Inc.
   4 ;;
   5 ;; Version: 7.7
   6 ;; Author: Carsten Dominik <carsten.dominik AT gmail DOT com>
   7 ;; Maintainer: Carsten Dominik <carsten.dominik AT gmail DOT com>
   8 ;; Keywords: org, wp, tex
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26 ;;
  27 ;; This library implement the special treatment needed by using the
  28 ;; beamer class during LaTeX export.
  29
  30 ;;; Code:
  31
  32 (require 'org)
  33 (require 'org-exp)
  34
  35 (defvar org-export-latex-header)
  36 (defvar org-export-latex-options-plist)
  37 (defvar org-export-opt-plist)
  38
  39 (defgroup org-beamer nil
  40   "Options specific for using the beamer class in LaTeX export."
  41   :tag "Org Beamer"
  42   :group 'org-export-latex)
  43
  44 (defcustom org-beamer-use-parts nil
  45   ""
  46   :group 'org-beamer
  47   :type 'boolean)
  48
  49 (defcustom org-beamer-frame-level 1
  50   "The level that should be interpreted as a frame.
  51 The levels above this one will be translated into a sectioning structure.
  52 Setting this to 2 will allow sections, 3 will allow subsections as well.
  53 You can set this to 4 as well, if you at the same time set
  54 `org-beamer-use-parts' to make the top levels `\part'."
  55   :group 'org-beamer
  56   :type '(choice
  57           (const :tag "Frames need a BEAMER_env property" nil)
  58           (integer :tag "Specific level makes a frame")))
  59
  60 (defcustom org-beamer-frame-default-options ""
  61   "Default options string to use for frames, should contains the [brackets].
  62 And example for this is \"[allowframebreaks]\"."
  63   :group 'org-beamer
  64   :type '(string :tag "[options]"))
  65
  66 (defcustom org-beamer-column-view-format
  67   "%45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)"
  68   "Default column view format that should be used to fill the template."
  69   :group 'org-beamer
  70   :type '(choice
  71           (const  :tag "Do not insert Beamer column view format" nil)
  72           (string :tag "Beamer column view format")))
  73
  74 (defcustom org-beamer-themes
  75   "\\usetheme{default}\\usecolortheme{default}"
  76   "Default string to be used for extra heading stuff in beamer presentations.
  77 When a beamer template is filled, this will be the default for
  78 BEAMER_HEADER_EXTRA, which will be inserted just before \\begin{document}."
  79   :group 'org-beamer
  80   :type '(choice
  81           (const  :tag "Do not insert Beamer themes" nil)
  82           (string :tag "Beamer themes")))
  83
  84 (defconst org-beamer-column-widths
  85   "0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 :ETC"
  86 "The column widths that should be installed as allowed property values.")
  87
  88 (defconst org-beamer-transitions
  89   "\transblindsvertical \transblindshorizontal \transboxin \transboxout \transdissolve \transduration \transglitter \transsplithorizontalin \transsplithorizontalout \transsplitverticalin \transsplitverticalout \transwipe :ETC"
  90   "Transitions available for beamer.
  91 These are just a completion help.")
  92
  93 (defconst org-beamer-environments-default
  94   '(("frame"          "f" "dummy- special handling hard coded" "dummy")
  95     ("columns"        "C" "\\begin{columns}%o %% %h%x"         "\\end{columns}")
  96     ("column"         "c" "\\begin{column}%o{%h\\textwidth}%x" "\\end{column}")
  97     ("block"          "b" "\\begin{block}%a{%h}%x"             "\\end{block}")
  98     ("alertblock"     "a" "\\begin{alertblock}%a{%h}%x"        "\\end{alertblock}")
  99     ("verse"          "v" "\\begin{verse}%a %% %h%x"           "\\end{verse}")
 100     ("quotation"      "q" "\\begin{quotation}%a %% %h%x"       "\\end{quotation}")
 101     ("quote"          "Q" "\\begin{quote}%a %% %h%x"           "\\end{quote}")
 102     ("structureenv"   "s" "\\begin{structureenv}%a %% %h%x"    "\\end{structureenv}")
 103     ("theorem"        "t" "\\begin{theorem}%a%U%x"             "\\end{theorem}")
 104     ("definition"     "d" "\\begin{definition}%a%U%x"          "\\end{definition}")
 105     ("example"        "e" "\\begin{example}%a%U%x"             "\\end{example}")
 106     ("proof"          "p" "\\begin{proof}%a%U%x"               "\\end{proof}")
 107     ("beamercolorbox" "o" "\\begin{beamercolorbox}%o{%h}%x"    "\\end{beamercolorbox}")
 108     ("normal"         "h" "%h" "") ; Emit the heading as normal text
 109     ("note"           "n" "\\note%o%a{%h"                      "}")
 110     ("noteNH"         "N" "\\note%o%a{"                        "}") ; note, ignore heading
 111     ("ignoreheading"  "i" "%%%% %h" ""))
 112   "Environments triggered by properties in Beamer export.
 113 These are the defaults - for user definitions, see
 114 `org-beamer-environments-extra'.
 115 \"normal\" is a special fake environment, which emit the heading as
 116 normal text. It is needed when an environment should be surrounded
 117 by normal text.  Since beamer export converts nodes into environments,
 118 you need to have a node to end the environment.
 119 For example
 120
 121    ** a frame
 122       some text
 123    *** Blocktitle :B_block:
 124        inside the block
 125    *** After the block :B_normal:
 126        continuing here
 127    ** next frame")
 128
 129 (defcustom org-beamer-environments-extra nil
 130   "Environments triggered by tags in Beamer export.
 131 Each entry has 4 elements:
 132
 133 name    Name of the environment
 134 key     Selection key for `org-beamer-select-environment'
 135 open    The opening template for the environment, with the following escapes
 136         %a   the action/overlay specification
 137         %A   the default action/overlay specification
 138         %o   the options argument of the template
 139         %h   the headline text
 140         %H   if there is headline text, that text in {} braces
 141         %U   if there is headline text, that text in [] brackets
 142         %x   the content of the BEAMER_extra property
 143 close   The closing string of the environment."
 144
 145   :group 'org-beamer
 146   :type '(repeat
 147           (list
 148            (string :tag "Environment")
 149            (string :tag "Selection key")
 150            (string :tag "Begin")
 151            (string :tag "End"))))
 152
 153 (defvar org-beamer-frame-level-now nil)
 154 (defvar org-beamer-header-extra nil)
 155 (defvar org-beamer-export-is-beamer-p nil)
 156 (defvar org-beamer-inside-frame-at-level nil)
 157 (defvar org-beamer-columns-open nil)
 158 (defvar org-beamer-column-open nil)
 159
 160 (defun org-beamer-cleanup-column-width (width)
 161   "Make sure the width is not empty, and that it has a unit."
 162   (setq width (org-trim (or width "")))
 163   (unless (string-match "\\S-" width) (setq width "0.5"))
 164   (if (string-match "\\`[.0-9]+\\'" width)
 165       (setq width (concat width "\\textwidth")))
 166   width)
 167
 168 (defun org-beamer-open-column (&optional width opt)
 169   (org-beamer-close-column-maybe)
 170   (setq org-beamer-column-open t)
 171   (setq width (org-beamer-cleanup-column-width width))
 172   (insert (format "\\begin{column}%s{%s}\n" (or opt "") width)))
 173 (defun org-beamer-close-column-maybe ()
 174   (when org-beamer-column-open
 175     (setq org-beamer-column-open nil)
 176     (insert "\\end{column}\n")))
 177 (defun org-beamer-open-columns-maybe (&optional opts)
 178   (unless org-beamer-columns-open
 179     (setq org-beamer-columns-open t)
 180     (insert (format "\\begin{columns}%s\n" (or opts "")))))
 181 (defun org-beamer-close-columns-maybe ()
 182   (org-beamer-close-column-maybe)
 183   (when org-beamer-columns-open
 184     (setq org-beamer-columns-open nil)
 185     (insert "\\end{columns}\n")))
 186
 187 (defun org-beamer-select-environment ()
 188   "Select the environment to be used by beamer for this entry.
 189 While this uses (for convenience) a tag selection interface, the result
 190 of this command will be that the BEAMER_env *property* of the entry is set.
 191
 192 In addition to this, the command will also set a tag as a visual aid, but
 193 the tag does not have any semantic meaning."
 194   (interactive)
 195   (let* ((envs (append org-beamer-environments-extra
 196                        org-beamer-environments-default))
 197          (org-tag-alist
 198           (append '((:startgroup))
 199                   (mapcar (lambda (e) (cons (concat "B_" (car e))
 200                                             (string-to-char (nth 1 e))))
 201                           envs)
 202                   '((:endgroup))
 203                   '(("BMCOL" . ?|))))
 204          (org-fast-tag-selection-single-key t))
 205     (org-set-tags)
 206     (let ((tags (or (ignore-errors (org-get-tags-string)) "")))
 207       (cond
 208        ((equal org-last-tag-selection-key ?|)
 209         (if (string-match ":BMCOL:" tags)
 210             (org-set-property "BEAMER_col" (read-string "Column width: "))
 211           (org-delete-property "BEAMER_col")))
 212        ((string-match (concat ":B_\\("
 213                               (mapconcat 'car envs "\\|")
 214                               "\\):")
 215                       tags)
 216         (org-entry-put nil "BEAMER_env" (match-string 1 tags)))
 217        (t (org-entry-delete nil "BEAMER_env"))))))
 218
 219
 220 (defun org-beamer-sectioning (level text)
 221   "Return the sectioning entry for the current headline.
 222 LEVEL is the reduced level of the headline.
 223 TEXT is the text of the headline, everything except the leading stars.
 224 The return value is a cons cell.  The car is the headline text, usually
 225 just TEXT, but possibly modified if options have been extracted from the
 226 text.  The cdr is the sectioning entry, similar to what is given
 227 in org-export-latex-classes."
 228   (let* ((frame-level (or org-beamer-frame-level-now org-beamer-frame-level))
 229          (default
 230            (if org-beamer-use-parts
 231                '((1 . ("\\part{%s}" . "\\part*{%s}"))
 232                  (2 . ("\\section{%s}" . "\\section*{%s}"))
 233                  (3 . ("\\subsection{%s}" . "\\subsection*{%s}")))
 234              '((1 . ("\\section{%s}" . "\\section*{%s}"))
 235                (2 . ("\\subsection{%s}" . "\\subsection*{%s}")))))
 236          (envs (append org-beamer-environments-extra
 237                        org-beamer-environments-default))
 238          (props (org-get-text-property-any 0 'org-props text))
 239          (in "") (out "") option action defaction environment extra
 240          columns-option column-option
 241          env have-text ass tmp)
 242     (if (= frame-level 0) (setq frame-level nil))
 243     (when (and org-beamer-inside-frame-at-level
 244                (<= level org-beamer-inside-frame-at-level))
 245       (setq org-beamer-inside-frame-at-level nil))
 246     (when (setq tmp (org-beamer-assoc-not-empty "BEAMER_col" props))
 247       (if (and (string-match "\\`[0-9.]+\\'" tmp)
 248                (or (= (string-to-number tmp) 1.0)
 249                    (= (string-to-number tmp) 0.0)))
 250           ;; column width 1 means close columns, go back to full width
 251           (org-beamer-close-columns-maybe)
 252         (when (setq ass (assoc "BEAMER_envargs" props))
 253           (let (case-fold-search)
 254             (while (string-match "C\\(\\[[^][]*\\]\\|<[^<>]*>\\)" (cdr ass))
 255               (setq columns-option (match-string 1 (cdr ass)))
 256               (setcdr ass (replace-match "" t t (cdr ass))))
 257             (while (string-match "c\\(\\[[^][]*\\]\\|<[^<>]*>\\)" (cdr ass))
 258               (setq column-option (match-string 1 (cdr ass)))
 259               (setcdr ass (replace-match "" t t (cdr ass))))))
 260         (org-beamer-open-columns-maybe columns-option)
 261         (org-beamer-open-column tmp column-option)))
 262     (cond
 263      ((or (equal (cdr (assoc "BEAMER_env" props)) "frame")
 264           (and frame-level (= level frame-level)))
 265       ;; A frame
 266       (org-beamer-get-special props)
 267
 268       (setq in (org-fill-template
 269                 "\\begin{frame}%a%A%o%T%S%x"
 270                 (list (cons "a" (or action ""))
 271                       (cons "A" (or defaction ""))
 272                       (cons "o" (or option org-beamer-frame-default-options ""))
 273                       (cons "x" (if extra (concat "\n" extra) ""))
 274                       (cons "h" "%s")
 275                       (cons "T" (if (string-match "\\S-" text)
 276                                     "\n\\frametitle{%s}" ""))
 277                       (cons "S" (if (string-match "\\\\\\\\" text)
 278                                     "\n\\framesubtitle{%s}" ""))))
 279             out (copy-sequence "\\end{frame}"))
 280       (org-add-props out
 281           '(org-insert-hook org-beamer-close-columns-maybe))
 282       (setq org-beamer-inside-frame-at-level level)
 283       (cons text (list in out in out)))
 284      ((and (setq env (cdr (assoc "BEAMER_env" props)))
 285            (setq ass (assoc env envs)))
 286       ;; A beamer environment selected by the BEAMER_env property
 287       (if (string-match "[ \t]+:[ \t]*$" text)
 288           (setq text (replace-match "" t t text)))
 289       (if (member env '("note" "noteNH"))
 290           ;; There should be no labels in a note, so we remove the targets
 291           ;; FIXME???
 292           (remove-text-properties 0 (length text) '(target nil) text))
 293       (org-beamer-get-special props)
 294       (setq text (org-trim text))
 295       (setq have-text (string-match "\\S-" text))
 296       (setq in (org-fill-template
 297                 (nth 2 ass)
 298                 (list (cons "a" (or action ""))
 299                       (cons "A" (or defaction ""))
 300                       (cons "o" (or option ""))
 301                       (cons "x" (if extra (concat "\n" extra) ""))
 302                       (cons "h" "%s")
 303                       (cons "H" (if have-text (concat "{" text "}") ""))
 304                       (cons "U" (if have-text (concat "[" text "]") ""))))
 305             out (nth 3 ass))
 306       (cond
 307        ((equal out "\\end{columns}")
 308         (setq org-beamer-columns-open t)
 309         (setq out (org-add-props (copy-sequence out)
 310                       '(org-insert-hook
 311                         (lambda ()
 312                           (org-beamer-close-column-maybe)
 313                           (setq org-beamer-columns-open nil))))))
 314        ((equal out "\\end{column}")
 315         (org-beamer-open-columns-maybe)))
 316       (cons text (list in out in out)))
 317      ((and (not org-beamer-inside-frame-at-level)
 318            (or (not frame-level)
 319                (< level frame-level))
 320            (assoc level default))
 321       ;; Normal sectioning
 322       (cons text (cdr (assoc level default))))
 323      (t nil))))
 324
 325 (defvar extra)
 326 (defvar option)
 327 (defvar action)
 328 (defvar defaction)
 329 (defvar environment)
 330 (defun org-beamer-get-special (props)
 331   "Extract an option, action, and default action string from text.
 332 The variables option, action, defaction, extra are all scoped into
 333 this function dynamically."
 334   (let (tmp)
 335     (setq environment (org-beamer-assoc-not-empty "BEAMER_env" props))
 336     (setq extra (org-beamer-assoc-not-empty "BEAMER_extra" props))
 337     (when extra
 338       (setq extra (replace-regexp-in-string "\\\\n" "\n" extra)))
 339     (setq tmp (org-beamer-assoc-not-empty "BEAMER_envargs" props))
 340     (when tmp
 341       (setq tmp (copy-sequence tmp))
 342       (if (string-match "\\[<[^][<>]*>\\]" tmp)
 343           (setq defaction (match-string 0 tmp)
 344                 tmp (replace-match "" t t tmp)))
 345       (if (string-match "\\[[^][]*\\]" tmp)
 346           (setq option (match-string 0 tmp)
 347                 tmp (replace-match "" t t tmp)))
 348       (if (string-match "<[^<>]*>" tmp)
 349           (setq action (match-string 0 tmp)
 350                 tmp (replace-match "" t t tmp))))))
 351
 352 (defun org-beamer-assoc-not-empty (elt list)
 353   (let ((tmp (cdr (assoc elt list))))
 354     (and tmp (string-match "\\S-" tmp) tmp)))
 355
 356
 357 (defvar org-beamer-mode-map (make-sparse-keymap)
 358   "The keymap for `org-beamer-mode'.")
 359 (define-key org-beamer-mode-map "\C-c\C-b" 'org-beamer-select-environment)
 360
 361 (define-minor-mode org-beamer-mode
 362   "Special support for editing Org-mode files made to export to beamer."
 363   nil " Bm" nil)
 364 (when (fboundp 'font-lock-add-keywords)
 365   (font-lock-add-keywords
 366    'org-mode
 367    '((":\\(B_[a-z]+\\|BMCOL\\):" 1 'org-beamer-tag prepend))
 368    'prepent))
 369
 370 (defun org-beamer-place-default-actions-for-lists ()
 371   "Find default overlay specifications in items, and move them.
 372 The need to be after the begin statement of the environment."
 373   (when org-beamer-export-is-beamer-p
 374     (let (dovl)
 375       (goto-char (point-min))
 376       (while (re-search-forward
 377               "^[ \t]*\\\\begin{\\(itemize\\|enumerate\\|description\\)}[ \t\n]*\\\\item\\>\\( ?\\(<[^<>\n]*>\\|\\[[^][\n*]\\]\\)\\)?[ \t]*\\S-" nil t)
 378         (if (setq dovl (cdr (assoc "BEAMER_dovl"
 379                                    (get-text-property (match-end 0)
 380                                                       'org-props))))
 381             (save-excursion
 382               (goto-char (1+ (match-end 1)))
 383               (insert dovl)))))))
 384
 385 (defun org-beamer-amend-header ()
 386   "Add `org-beamer-header-extra' to the LaTeX header.
 387 If the file contains the string BEAMER-HEADER-EXTRA-HERE on a line
 388 by itself, it will be replaced with `org-beamer-header-extra'.  If not,
 389 the value will be inserted right after the documentclass statement."
 390   (when (and org-beamer-export-is-beamer-p
 391              org-beamer-header-extra)
 392     (goto-char (point-min))
 393     (cond
 394      ((re-search-forward
 395        "^[ \t]*\\[?BEAMER-HEADER-EXTRA\\(-HERE\\)?\\]?[ \t]*$" nil t)
 396       (replace-match org-beamer-header-extra t t)
 397       (or (bolp) (insert "\n")))
 398      ((re-search-forward "^[ \t]*\\\\begin{document}" nil t)
 399       (beginning-of-line 1)
 400       (insert org-beamer-header-extra)
 401       (or (bolp) (insert "\n"))))))
 402
 403 (defcustom org-beamer-fragile-re "^[ \t]*\\\\begin{\\(verbatim\\|lstlisting\\|minted\\)}"
 404   "If this regexp matches in a frame, the frame is marked as fragile."
 405   :group 'org-beamer
 406   :type 'regexp)
 407
 408 (defface org-beamer-tag '((t (:box (:line-width 1 :color grey40))))
 409   "The special face for beamer tags."
 410   :group 'org-beamer)
 411
 412
 413 ;; Functions to initialize and post-process
 414 ;; These functions will be hooked into various places in the export process
 415
 416 (defun org-beamer-initialize-open-trackers ()
 417   "Reset variables that track if certain environments are open during export."
 418   (setq org-beamer-columns-open nil)
 419   (setq org-beamer-column-open nil)
 420   (setq org-beamer-inside-frame-at-level nil)
 421   (setq org-beamer-export-is-beamer-p nil))
 422
 423 (defun org-beamer-after-initial-vars ()
 424   "Find special settings for beamer and store them.
 425 The effect is that these values will be accessible during export."
 426   ;; First verify that we are exporting using the beamer class
 427   (setq org-beamer-export-is-beamer-p
 428         (string-match "\\\\documentclass\\(\\[[^][]*?\\]\\)?{beamer}"
 429                       org-export-latex-header))
 430   (when org-beamer-export-is-beamer-p
 431     ;; Find the frame level
 432     (setq org-beamer-frame-level-now
 433           (or (and (org-region-active-p)
 434                    (save-excursion
 435                      (goto-char (region-beginning))
 436                      (and (looking-at org-complex-heading-regexp)
 437                           (org-entry-get nil "BEAMER_FRAME_LEVEL" 'selective))))
 438               (save-excursion
 439                 (save-restriction
 440                   (widen)
 441                   (goto-char (point-min))
 442                   (and (re-search-forward
 443                         "^#\\+BEAMER_FRAME_LEVEL:[ \t]*\\(.*?\\)[ \t]*$" nil t)
 444                        (match-string 1))))
 445               (plist-get org-export-latex-options-plist :beamer-frame-level)
 446               org-beamer-frame-level))
 447     ;; Normalize the value so that the functions can trust the value
 448     (cond
 449      ((not org-beamer-frame-level-now)
 450       (setq org-beamer-frame-level-now nil))
 451      ((stringp org-beamer-frame-level-now)
 452       (setq org-beamer-frame-level-now
 453             (string-to-number org-beamer-frame-level-now))))
 454     ;; Find the header additions, most likely theme commands
 455     (setq org-beamer-header-extra
 456           (or (and (org-region-active-p)
 457                    (save-excursion
 458                      (goto-char (region-beginning))
 459                      (and (looking-at org-complex-heading-regexp)
 460                           (org-entry-get nil "BEAMER_HEADER_EXTRA"
 461                                          'selective))))
 462               (save-excursion
 463                 (save-restriction
 464                   (widen)
 465                   (let ((txt ""))
 466                     (goto-char (point-min))
 467                     (while (re-search-forward
 468                             "^#\\+BEAMER_HEADER_EXTRA:[ \t]*\\(.*?\\)[ \t]*$"
 469                             nil t)
 470                       (setq txt (concat txt "\n" (match-string 1))))
 471                     (if (> (length txt) 0) (substring txt 1)))))
 472               (plist-get org-export-latex-options-plist
 473                          :beamer-header-extra)))
 474     (let ((inhibit-read-only t)
 475           (case-fold-search nil)
 476           props)
 477       (org-unmodified
 478        (remove-text-properties (point-min) (point-max) '(org-props nil))
 479        (org-map-entries
 480         '(progn
 481            (setq props (org-entry-properties nil 'standard))
 482            (if (and (not (assoc "BEAMER_env" props))
 483                     (looking-at ".*?:B_\\(note\\(NH\\)?\\):"))
 484                (push (cons "BEAMER_env" (match-string 1)) props))
 485            (put-text-property (point-at-bol) (point-at-eol) 'org-props props)))
 486        (setq org-export-latex-options-plist
 487              (plist-put org-export-latex-options-plist :tags nil))))))
 488
 489 (defun org-beamer-auto-fragile-frames ()
 490   "Mark any frames containing verbatim environments as fragile.
 491 This function will run in the final LaTeX document."
 492   (when org-beamer-export-is-beamer-p
 493     (let (opts)
 494       (goto-char (point-min))
 495       ;; Find something that might be fragile
 496       (while (re-search-forward org-beamer-fragile-re nil t)
 497         (save-excursion
 498           ;; Are we inside a frame here?
 499           (when (and (re-search-backward "^[ \t]*\\\\\\(begin\\|end\\){frame}"
 500                                          nil t)
 501                      (equal (match-string 1) "begin"))
 502             ;; yes, inside a frame, make sure "fragile" is one of the options
 503             (goto-char (match-end 0))
 504             (if (not (looking-at "\\[.*?\\]"))
 505                 (insert "[fragile]")
 506               (setq opts (substring (match-string 0) 1 -1))
 507               (delete-region (match-beginning 0) (match-end 0))
 508               (setq opts (org-split-string opts ","))
 509               (add-to-list 'opts "fragile")
 510               (insert "[" (mapconcat 'identity opts ",") "]"))))))))
 511
 512 (defcustom org-beamer-outline-frame-title "Outline"
 513   "Default title of a frame containing an outline."
 514   :group 'org-beamer
 515   :type '(string :tag "Outline frame title")
 516 )
 517
 518 (defcustom org-beamer-outline-frame-options nil
 519   "Outline frame options appended after \\begin{frame}.
 520 You might want to put e.g. [allowframebreaks=0.9] here.  Remember to
 521 include square brackets."
 522   :group 'org-beamer
 523   :type '(string :tag "Outline frame options")
 524 )
 525
 526 (defun org-beamer-fix-toc ()
 527   "Fix the table of contents by removing the vspace line."
 528   (when org-beamer-export-is-beamer-p
 529     (save-excursion
 530       (goto-char (point-min))
 531       (when (re-search-forward "\\(\\\\setcounter{tocdepth.*\n\\\\tableofcontents.*\n\\)\\(\\\\vspace\\*.*\\)"
 532                                nil t)
 533         (replace-match
 534          (concat "\\\\begin{frame}" org-beamer-outline-frame-options
 535                  "\n\\\\frametitle{"
 536                  org-beamer-outline-frame-title
 537                  "}\n\\1\\\\end{frame}")
 538          t nil)))))
 539
 540 (defun org-beamer-property-changed (property value)
 541   "Track the BEAMER_env property with tags."
 542   (cond
 543    ((equal property "BEAMER_env")
 544     (save-excursion
 545       (org-back-to-heading t)
 546       (let ((tags (org-get-tags)))
 547         (setq tags (delq nil (mapcar (lambda (x)
 548                                        (if (string-match "^B_" x) nil x))
 549                                      tags)))
 550         (org-set-tags-to tags))
 551       (when (and value (stringp value) (string-match "\\S-" value))
 552         (org-toggle-tag (concat "B_" value) 'on))))
 553    ((equal property "BEAMER_col")
 554     (org-toggle-tag "BMCOL" (if (and value (string-match "\\S-" value))
 555                                 'on 'off)))))
 556
 557 (defun org-beamer-select-beamer-code ()
 558   "Take code marked for BEAMER and turn it into marked for LaTeX."
 559   (when org-beamer-export-is-beamer-p
 560     (goto-char (point-min))
 561     (while (re-search-forward
 562             "^\\([ \]*#\\+\\(begin_\\|end_\\)?\\)\\(beamer\\)\\>" nil t)
 563       (replace-match "\\1latex"))))
 564
 565 ;; OK, hook all these functions into appropriate places
 566 (add-hook 'org-export-first-hook
 567           'org-beamer-initialize-open-trackers)
 568 (add-hook 'org-property-changed-functions
 569           'org-beamer-property-changed)
 570 (add-hook 'org-export-latex-after-initial-vars-hook
 571           'org-beamer-after-initial-vars)
 572 (add-hook 'org-export-latex-final-hook
 573           'org-beamer-place-default-actions-for-lists)
 574 (add-hook 'org-export-latex-final-hook
 575           'org-beamer-auto-fragile-frames)
 576 (add-hook 'org-export-latex-final-hook
 577           'org-beamer-fix-toc)
 578 (add-hook 'org-export-latex-final-hook
 579           'org-beamer-amend-header)
 580 (add-hook 'org-export-preprocess-before-selecting-backend-code-hook
 581           'org-beamer-select-beamer-code)
 582
 583 (defun org-insert-beamer-options-template (kind)
 584   "Insert a settings template, to make sure users do this right."
 585   (interactive (progn
 586                  (message "Current [s]ubtree or [g]lobal?")
 587                  (if (equal (read-char-exclusive) ?g)
 588                      (list 'global)
 589                    (list 'subtree))))
 590   (if (eq kind 'subtree)
 591       (progn
 592         (org-back-to-heading t)
 593         (org-reveal)
 594         (org-entry-put nil "LaTeX_CLASS" "beamer")
 595         (org-entry-put nil "LaTeX_CLASS_OPTIONS" "[presentation]")
 596         (org-entry-put nil "EXPORT_FILE_NAME" "presentation.pdf")
 597         (org-entry-put nil "BEAMER_FRAME_LEVEL" (number-to-string
 598                                                  org-beamer-frame-level))
 599         (when org-beamer-themes
 600           (org-entry-put nil "BEAMER_HEADER_EXTRA" org-beamer-themes))
 601         (when org-beamer-column-view-format
 602           (org-entry-put nil "COLUMNS" org-beamer-column-view-format))
 603         (org-entry-put nil "BEAMER_col_ALL" "0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC"))
 604     (insert "#+LaTeX_CLASS: beamer\n")
 605     (insert "#+LaTeX_CLASS_OPTIONS: [presentation]\n")
 606     (insert (format "#+BEAMER_FRAME_LEVEL: %d\n" org-beamer-frame-level) "\n")
 607     (when org-beamer-themes
 608       (insert "#+BEAMER_HEADER_EXTRA: " org-beamer-themes "\n"))
 609     (when org-beamer-column-view-format
 610       (insert "#+COLUMNS: " org-beamer-column-view-format "\n"))
 611     (insert "#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC\n")))
 612
 613
 614 (defun org-beamer-allowed-property-values (property)
 615   "Supply allowed values for BEAMER properties."
 616   (cond
 617    ((and (equal property "BEAMER_env")
 618          (not (org-entry-get nil (concat property "_ALL") 'inherit)))
 619     ;; If no allowed values for BEAMER_env have been defined,
 620     ;; supply all defined environments
 621     (mapcar 'car (append org-beamer-environments-extra
 622                          org-beamer-environments-default)))
 623    ((and (equal property "BEAMER_col")
 624          (not (org-entry-get nil (concat property "_ALL") 'inherit)))
 625     ;; If no allowed values for BEAMER_col have been defined,
 626     ;; supply some
 627     '("0.1" "0.2" "0.3" "0.4" "0.5" "0.6" "0.7" "0.8" "0.9" "" ":ETC"))
 628    (t nil)))
 629
 630 (add-hook 'org-property-allowed-value-functions
 631           'org-beamer-allowed-property-values)
 632
 633 (provide 'org-beamer)
 634
 635
 636
 637 ;;; org-beamer.el ends here