lisp/org-beamer.el

   1 ;;; org-beamer.el --- Beamer-specific LaTeX export for org-mode
   2 ;;
   3 ;; Copyright (C) 2007-2013 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Carsten Dominik <carsten.dominik AT gmail DOT com>
   6 ;; Maintainer: Carsten Dominik <carsten.dominik AT gmail DOT com>
   7 ;; Keywords: org, wp, tex
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25 ;;
  26 ;; This library implement the special treatment needed by using the
  27 ;; beamer class during LaTeX export.
  28
  29 ;;; Code:
  30
  31 (require 'org)
  32 (require 'org-exp)
  33
  34 (defvar org-export-latex-header)
  35 (defvar org-export-latex-options-plist)
  36 (defvar org-export-opt-plist)
  37
  38 (defgroup org-beamer nil
  39   "Options specific for using the beamer class in LaTeX export."
  40   :tag "Org Beamer"
  41   :group 'org-export-latex)
  42
  43 (defcustom org-beamer-use-parts nil
  44   ""
  45   :group 'org-beamer
  46   :version "24.1"
  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   :version "24.1"
  57   :type '(choice
  58           (const :tag "Frames need a BEAMER_env property" nil)
  59           (integer :tag "Specific level makes a frame")))
  60
  61 (defcustom org-beamer-frame-default-options ""
  62   "Default options string to use for frames, should contains the [brackets].
  63 And example for this is \"[allowframebreaks]\"."
  64   :group 'org-beamer
  65   :version "24.1"
  66   :type '(string :tag "[options]"))
  67
  68 (defcustom org-beamer-column-view-format
  69   "%45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)"
  70   "Default column view format that should be used to fill the template."
  71   :group 'org-beamer
  72   :version "24.1"
  73   :type '(choice
  74           (const  :tag "Do not insert Beamer column view format" nil)
  75           (string :tag "Beamer column view format")))
  76
  77 (defcustom org-beamer-themes
  78   "\\usetheme{default}\\usecolortheme{default}"
  79   "Default string to be used for extra heading stuff in beamer presentations.
  80 When a beamer template is filled, this will be the default for
  81 BEAMER_HEADER_EXTRA, which will be inserted just before \\begin{document}."
  82   :group 'org-beamer
  83   :version "24.1"
  84   :type '(choice
  85           (const  :tag "Do not insert Beamer themes" nil)
  86           (string :tag "Beamer themes")))
  87
  88 (defconst org-beamer-column-widths
  89   "0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 :ETC"
  90   "The column widths that should be installed as allowed property values.")
  91
  92 (defconst org-beamer-transitions
  93   "\transblindsvertical \transblindshorizontal \transboxin \transboxout \transdissolve \transduration \transglitter \transsplithorizontalin \transsplithorizontalout \transsplitverticalin \transsplitverticalout \transwipe :ETC"
  94   "Transitions available for beamer.
  95 These are just a completion help.")
  96
  97 (defconst org-beamer-environments-default
  98   '(("frame"          "f" "dummy- special handling hard coded" "dummy")
  99     ("columns"        "C" "\\begin{columns}%o %% %h%x"         "\\end{columns}")
 100     ("column"         "c" "\\begin{column}%o{%h\\textwidth}%x" "\\end{column}")
 101     ("block"          "b" "\\begin{block}%a{%h}%x"             "\\end{block}")
 102     ("alertblock"     "a" "\\begin{alertblock}%a{%h}%x"        "\\end{alertblock}")
 103     ("verse"          "v" "\\begin{verse}%a %% %h%x"           "\\end{verse}")
 104     ("quotation"      "q" "\\begin{quotation}%a %% %h%x"       "\\end{quotation}")
 105     ("quote"          "Q" "\\begin{quote}%a %% %h%x"           "\\end{quote}")
 106     ("structureenv"   "s" "\\begin{structureenv}%a %% %h%x"    "\\end{structureenv}")
 107     ("theorem"        "t" "\\begin{theorem}%a%U%x"             "\\end{theorem}")
 108     ("definition"     "d" "\\begin{definition}%a%U%x"          "\\end{definition}")
 109     ("example"        "e" "\\begin{example}%a%U%x"             "\\end{example}")
 110     ("exampleblock"   "E" "\\begin{exampleblock}%a{%h}%x"      "\\end{exampleblock}")
 111     ("proof"          "p" "\\begin{proof}%a%U%x"               "\\end{proof}")
 112     ("beamercolorbox" "o" "\\begin{beamercolorbox}%o{%h}%x"    "\\end{beamercolorbox}")
 113     ("normal"         "h" "%h" "") ; Emit the heading as normal text
 114     ("note"           "n" "\\note%o%a{%h"                      "}")
 115     ("noteNH"         "N" "\\note%o%a{"                        "}") ; note, ignore heading
 116     ("ignoreheading"  "i" "%%%% %h" ""))
 117   "Environments triggered by properties in Beamer export.
 118 These are the defaults - for user definitions, see
 119 `org-beamer-environments-extra'.
 120 \"normal\" is a special fake environment, which emit the heading as
 121 normal text.  It is needed when an environment should be surrounded
 122 by normal text.  Since beamer export converts nodes into environments,
 123 you need to have a node to end the environment.
 124 For example
 125
 126    ** a frame
 127       some text
 128    *** Blocktitle :B_block:
 129        inside the block
 130    *** After the block :B_normal:
 131        continuing here
 132    ** next frame")
 133
 134 (defcustom org-beamer-environments-extra nil
 135   "Environments triggered by tags in Beamer export.
 136 Each entry has 4 elements:
 137
 138 name    Name of the environment
 139 key     Selection key for `org-beamer-select-environment'
 140 open    The opening template for the environment, with the following escapes
 141         %a   the action/overlay specification
 142         %A   the default action/overlay specification
 143         %o   the options argument of the template
 144         %h   the headline text
 145         %H   if there is headline text, that text in {} braces
 146         %U   if there is headline text, that text in [] brackets
 147         %x   the content of the BEAMER_extra property
 148 close   The closing string of the environment."
 149
 150   :group 'org-beamer
 151   :version "24.1"
 152   :type '(repeat
 153           (list
 154            (string :tag "Environment")
 155            (string :tag "Selection key")
 156            (string :tag "Begin")
 157            (string :tag "End"))))
 158
 159 (defcustom org-beamer-inherited-properties nil
 160   "Properties that should be inherited during beamer export."
 161   :group 'org-beamer
 162   :type '(repeat
 163           (string :tag "Property")))
 164
 165 (defvar org-beamer-frame-level-now nil)
 166 (defvar org-beamer-header-extra nil)
 167 (defvar org-beamer-export-is-beamer-p nil)
 168 (defvar org-beamer-inside-frame-at-level nil)
 169 (defvar org-beamer-columns-open nil)
 170 (defvar org-beamer-column-open nil)
 171
 172 (defun org-beamer-cleanup-column-width (width)
 173   "Make sure the width is not empty, and that it has a unit."
 174   (setq width (org-trim (or width "")))
 175   (unless (string-match "\\S-" width) (setq width "0.5"))
 176   (if (string-match "\\`[.0-9]+\\'" width)
 177       (setq width (concat width "\\textwidth")))
 178   width)
 179
 180 (defun org-beamer-open-column (&optional width opt)
 181   (org-beamer-close-column-maybe)
 182   (setq org-beamer-column-open t)
 183   (setq width (org-beamer-cleanup-column-width width))
 184   (insert (format "\\begin{column}%s{%s}\n" (or opt "") width)))
 185 (defun org-beamer-close-column-maybe ()
 186   (when org-beamer-column-open
 187     (setq org-beamer-column-open nil)
 188     (insert "\\end{column}\n")))
 189 (defun org-beamer-open-columns-maybe (&optional opts)
 190   (unless org-beamer-columns-open
 191     (setq org-beamer-columns-open t)
 192     (insert (format "\\begin{columns}%s\n" (or opts "")))))
 193 (defun org-beamer-close-columns-maybe ()
 194   (org-beamer-close-column-maybe)
 195   (when org-beamer-columns-open
 196     (setq org-beamer-columns-open nil)
 197     (insert "\\end{columns}\n")))
 198
 199 (defun org-beamer-select-environment ()
 200   "Select the environment to be used by beamer for this entry.
 201 While this uses (for convenience) a tag selection interface, the result
 202 of this command will be that the BEAMER_env *property* of the entry is set.
 203
 204 In addition to this, the command will also set a tag as a visual aid, but
 205 the tag does not have any semantic meaning."
 206   (interactive)
 207   (let* ((envs (append org-beamer-environments-extra
 208                        org-beamer-environments-default))
 209          (org-tag-alist
 210           (append '((:startgroup))
 211                   (mapcar (lambda (e) (cons (concat "B_" (car e))
 212                                             (string-to-char (nth 1 e))))
 213                           envs)
 214                   '((:endgroup))
 215                   '(("BMCOL" . ?|))))
 216          (org-fast-tag-selection-single-key t))
 217     (org-set-tags)
 218     (let ((tags (or (ignore-errors (org-get-tags-string)) "")))
 219       (cond
 220        ((equal org-last-tag-selection-key ?|)
 221         (if (string-match ":BMCOL:" tags)
 222             (org-set-property "BEAMER_col" (read-string "Column width: "))
 223           (org-delete-property "BEAMER_col")))
 224        ((string-match (concat ":B_\\("
 225                               (mapconcat 'car envs "\\|")
 226                               "\\):")
 227                       tags)
 228         (org-entry-put nil "BEAMER_env" (match-string 1 tags)))
 229        (t (org-entry-delete nil "BEAMER_env"))))))
 230
 231 ;;;###autoload
 232 (defun org-beamer-sectioning (level text)
 233   "Return the sectioning entry for the current headline.
 234 LEVEL is the reduced level of the headline.
 235 TEXT is the text of the headline, everything except the leading stars.
 236 The return value is a cons cell.  The car is the headline text, usually
 237 just TEXT, but possibly modified if options have been extracted from the
 238 text.  The cdr is the sectioning entry, similar to what is given
 239 in org-export-latex-classes."
 240   (let* ((frame-level (or org-beamer-frame-level-now org-beamer-frame-level))
 241          (default
 242            (if org-beamer-use-parts
 243                '((1 . ("\\part{%s}" . "\\part*{%s}"))
 244                  (2 . ("\\section{%s}" . "\\section*{%s}"))
 245                  (3 . ("\\subsection{%s}" . "\\subsection*{%s}")))
 246              '((1 . ("\\section{%s}" . "\\section*{%s}"))
 247                (2 . ("\\subsection{%s}" . "\\subsection*{%s}")))))
 248          (envs (append org-beamer-environments-extra
 249                        org-beamer-environments-default))
 250          (props (org-get-text-property-any 0 'org-props text))
 251          (in "") (out "") org-beamer-option org-beamer-action org-beamer-defaction org-beamer-environment org-beamer-extra
 252          columns-option column-option
 253          env have-text ass tmp)
 254     (if (= frame-level 0) (setq frame-level nil))
 255     (when (and org-beamer-inside-frame-at-level
 256                (<= level org-beamer-inside-frame-at-level))
 257       (setq org-beamer-inside-frame-at-level nil))
 258     (when (setq tmp (org-beamer-assoc-not-empty "BEAMER_col" props))
 259       (if (and (string-match "\\`[0-9.]+\\'" tmp)
 260                (or (= (string-to-number tmp) 1.0)
 261                    (= (string-to-number tmp) 0.0)))
 262           ;; column width 1 means close columns, go back to full width
 263           (org-beamer-close-columns-maybe)
 264         (when (setq ass (assoc "BEAMER_envargs" props))
 265           (let (case-fold-search)
 266             (while (string-match "C\\(\\[[^][]*\\]\\|<[^<>]*>\\)" (cdr ass))
 267               (setq columns-option (match-string 1 (cdr ass)))
 268               (setcdr ass (replace-match "" t t (cdr ass))))
 269             (while (string-match "c\\(\\[[^][]*\\]\\|<[^<>]*>\\)" (cdr ass))
 270               (setq column-option (match-string 1 (cdr ass)))
 271               (setcdr ass (replace-match "" t t (cdr ass))))))
 272         (org-beamer-open-columns-maybe columns-option)
 273         (org-beamer-open-column tmp column-option)))
 274     (cond
 275      ((or (equal (cdr (assoc "BEAMER_env" props)) "frame")
 276           (and frame-level (= level frame-level)))
 277       ;; A frame
 278       (org-beamer-get-special props)
 279
 280       (setq in (org-fill-template
 281                 "\\begin{frame}%a%A%o%T%S%x"
 282                 (list (cons "a" (or org-beamer-action ""))
 283                       (cons "A" (or org-beamer-defaction ""))
 284                       (cons "o" (or org-beamer-option org-beamer-frame-default-options ""))
 285                       (cons "x" (if org-beamer-extra (concat "\n" org-beamer-extra) ""))
 286                       (cons "h" "%s")
 287                       (cons "T" (if (string-match "\\S-" text)
 288                                     "\n\\frametitle{%s}" ""))
 289                       (cons "S" (if (string-match "\\\\\\\\" text)
 290                                     "\n\\framesubtitle{%s}" ""))))
 291             out (copy-sequence "\\end{frame}"))
 292       (org-add-props out
 293           '(org-insert-hook org-beamer-close-columns-maybe))
 294       (setq org-beamer-inside-frame-at-level level)
 295       (cons text (list in out in out)))
 296      ((and (setq env (cdr (assoc "BEAMER_env" props)))
 297            (setq ass (assoc env envs)))
 298       ;; A beamer environment selected by the BEAMER_env property
 299       (if (string-match "[ \t]+:[ \t]*$" text)
 300           (setq text (replace-match "" t t text)))
 301       (if (member env '("note" "noteNH"))
 302           ;; There should be no labels in a note, so we remove the targets
 303           ;; FIXME???
 304           (remove-text-properties 0 (length text) '(target nil) text))
 305       (org-beamer-get-special props)
 306       (setq text (org-trim text))
 307       (setq have-text (string-match "\\S-" text))
 308       (setq in (org-fill-template
 309                 (nth 2 ass)
 310                 (list (cons "a" (or org-beamer-action ""))
 311                       (cons "A" (or org-beamer-defaction ""))
 312                       (cons "o" (or org-beamer-option ""))
 313                       (cons "x" (if org-beamer-extra (concat "\n" org-beamer-extra) ""))
 314                       (cons "h" "%s")
 315                       (cons "H" (if have-text (concat "{" text "}") ""))
 316                       (cons "U" (if have-text (concat "[" text "]") ""))))
 317             out (nth 3 ass))
 318       (cond
 319        ((equal out "\\end{columns}")
 320         (setq org-beamer-columns-open t)
 321         (setq out (org-add-props (copy-sequence out)
 322                       '(org-insert-hook
 323                         (lambda ()
 324                           (org-beamer-close-column-maybe)
 325                           (setq org-beamer-columns-open nil))))))
 326        ((equal out "\\end{column}")
 327         (org-beamer-open-columns-maybe)))
 328       (cons text (list in out in out)))
 329      ((and (not org-beamer-inside-frame-at-level)
 330            (or (not frame-level)
 331                (< level frame-level))
 332            (assoc level default))
 333       ;; Normal sectioning
 334       (cons text (cdr (assoc level default))))
 335      (t nil))))
 336
 337 (defvar org-beamer-extra)
 338 (defvar org-beamer-option)
 339 (defvar org-beamer-action)
 340 (defvar org-beamer-defaction)
 341 (defvar org-beamer-environment)
 342 (defun org-beamer-get-special (props)
 343   "Extract an option, action, and default action string from text.
 344 The variables org-beamer-option, org-beamer-action, org-beamer-defaction,
 345 org-beamer-extra are all scoped into this function dynamically."
 346   (let (tmp)
 347     (setq org-beamer-environment (org-beamer-assoc-not-empty "BEAMER_env" props))
 348     (setq org-beamer-extra (org-beamer-assoc-not-empty "BEAMER_extra" props))
 349     (when org-beamer-extra
 350       (setq org-beamer-extra (replace-regexp-in-string "\\\\n" "\n" org-beamer-extra)))
 351     (setq tmp (org-beamer-assoc-not-empty "BEAMER_envargs" props))
 352     (when tmp
 353       (setq tmp (copy-sequence tmp))
 354       (if (string-match "\\[<[^][<>]*>\\]" tmp)
 355           (setq org-beamer-defaction (match-string 0 tmp)
 356                 tmp (replace-match "" t t tmp)))
 357       (if (string-match "\\[[^][]*\\]" tmp)
 358           (setq org-beamer-option (match-string 0 tmp)
 359                 tmp (replace-match "" t t tmp)))
 360       (if (string-match "<[^<>]*>" tmp)
 361           (setq org-beamer-action (match-string 0 tmp)
 362                 tmp (replace-match "" t t tmp))))))
 363
 364 (defun org-beamer-assoc-not-empty (elt list)
 365   (let ((tmp (cdr (assoc elt list))))
 366     (and tmp (string-match "\\S-" tmp) tmp)))
 367
 368
 369 (defvar org-beamer-mode-map (make-sparse-keymap)
 370   "The keymap for `org-beamer-mode'.")
 371 (define-key org-beamer-mode-map "\C-c\C-b" 'org-beamer-select-environment)
 372
 373 ;;;###autoload
 374 (define-minor-mode org-beamer-mode
 375   "Special support for editing Org-mode files made to export to beamer."
 376   nil " Bm" nil)
 377 (when (fboundp 'font-lock-add-keywords)
 378   (font-lock-add-keywords
 379    'org-mode
 380    '((":\\(B_[a-z]+\\|BMCOL\\):" 1 'org-beamer-tag prepend))
 381    'prepent))
 382
 383 (defun org-beamer-place-default-actions-for-lists ()
 384   "Find default overlay specifications in items, and move them.
 385 The need to be after the begin statement of the environment."
 386   (when org-beamer-export-is-beamer-p
 387     (let (dovl)
 388       (goto-char (point-min))
 389       (while (re-search-forward
 390               "^[ \t]*\\\\begin{\\(itemize\\|enumerate\\|description\\)}[ \t\n]*\\\\item\\>\\( ?\\(<[^<>\n]*>\\|\\[[^][\n*]\\]\\)\\)?[ \t]*\\S-" nil t)
 391         (if (setq dovl (cdr (assoc "BEAMER_dovl"
 392                                    (get-text-property (match-end 0)
 393                                                       'org-props))))
 394             (save-excursion
 395               (goto-char (1+ (match-end 1)))
 396               (insert dovl)))))))
 397
 398 (defun org-beamer-amend-header ()
 399   "Add `org-beamer-header-extra' to the LaTeX header.
 400 If the file contains the string BEAMER-HEADER-EXTRA-HERE on a line
 401 by itself, it will be replaced with `org-beamer-header-extra'.  If not,
 402 the value will be inserted right after the documentclass statement."
 403   (when (and org-beamer-export-is-beamer-p
 404              org-beamer-header-extra)
 405     (goto-char (point-min))
 406     (cond
 407      ((re-search-forward
 408        "^[ \t]*\\[?BEAMER-HEADER-EXTRA\\(-HERE\\)?\\]?[ \t]*$" nil t)
 409       (replace-match org-beamer-header-extra t t)
 410       (or (bolp) (insert "\n")))
 411      ((re-search-forward "^[ \t]*\\\\begin{document}" nil t)
 412       (beginning-of-line 1)
 413       (insert org-beamer-header-extra)
 414       (or (bolp) (insert "\n"))))))
 415
 416 (defcustom org-beamer-fragile-re "\\\\\\(verb\\|lstinline\\)\\|^[ \t]*\\\\begin{\\(verbatim\\|lstlisting\\|minted\\)}"
 417   "If this regexp matches in a frame, the frame is marked as fragile."
 418   :group 'org-beamer
 419   :version "24.1"
 420   :type 'regexp)
 421
 422 (defface org-beamer-tag '((t (:box (:line-width 1 :color grey40))))
 423   "The special face for beamer tags."
 424   :group 'org-beamer)
 425
 426
 427 ;; Functions to initialize and post-process
 428 ;; These functions will be hooked into various places in the export process
 429
 430 (defun org-beamer-initialize-open-trackers ()
 431   "Reset variables that track if certain environments are open during export."
 432   (setq org-beamer-columns-open nil)
 433   (setq org-beamer-column-open nil)
 434   (setq org-beamer-inside-frame-at-level nil)
 435   (setq org-beamer-export-is-beamer-p nil))
 436
 437 (defun org-beamer-after-initial-vars ()
 438   "Find special settings for beamer and store them.
 439 The effect is that these values will be accessible during export."
 440   ;; First verify that we are exporting using the beamer class
 441   (setq org-beamer-export-is-beamer-p
 442         (string-match "\\\\documentclass\\(\\[[^][]*?\\]\\)?{beamer}"
 443                       org-export-latex-header))
 444   (when org-beamer-export-is-beamer-p
 445     ;; Find the frame level
 446     (setq org-beamer-frame-level-now
 447           (or (and (org-region-active-p)
 448                    (save-excursion
 449                      (goto-char (region-beginning))
 450                      (and (looking-at org-complex-heading-regexp)
 451                           (org-entry-get nil "BEAMER_FRAME_LEVEL" 'selective))))
 452               (save-excursion
 453                 (save-restriction
 454                   (widen)
 455                   (goto-char (point-min))
 456                   (and (re-search-forward
 457                         "^#\\+BEAMER_FRAME_LEVEL:[ \t]*\\(.*?\\)[ \t]*$" nil t)
 458                        (match-string 1))))
 459               (plist-get org-export-latex-options-plist :beamer-frame-level)
 460               org-beamer-frame-level))
 461     ;; Normalize the value so that the functions can trust the value
 462     (cond
 463      ((not org-beamer-frame-level-now)
 464       (setq org-beamer-frame-level-now nil))
 465      ((stringp org-beamer-frame-level-now)
 466       (setq org-beamer-frame-level-now
 467             (string-to-number org-beamer-frame-level-now))))
 468     ;; Find the header additions, most likely theme commands
 469     (setq org-beamer-header-extra
 470           (or (and (org-region-active-p)
 471                    (save-excursion
 472                      (goto-char (region-beginning))
 473                      (and (looking-at org-complex-heading-regexp)
 474                           (org-entry-get nil "BEAMER_HEADER_EXTRA"
 475                                          'selective))))
 476               (save-excursion
 477                 (save-restriction
 478                   (widen)
 479                   (let ((txt ""))
 480                     (goto-char (point-min))
 481                     (while (re-search-forward
 482                             "^#\\+BEAMER_HEADER_EXTRA:[ \t]*\\(.*?\\)[ \t]*$"
 483                             nil t)
 484                       (setq txt (concat txt "\n" (match-string 1))))
 485                     (if (> (length txt) 0) (substring txt 1)))))
 486               (plist-get org-export-latex-options-plist
 487                          :beamer-header-extra)))
 488     (let ((inhibit-read-only t)
 489           (case-fold-search nil)
 490           props)
 491       (org-unmodified
 492        (remove-text-properties (point-min) (point-max) '(org-props nil))
 493        (org-map-entries
 494         '(progn
 495            (setq props (org-entry-properties nil 'standard))
 496            (if (and (not (assoc "BEAMER_env" props))
 497                     (looking-at ".*?:B_\\(note\\(NH\\)?\\):"))
 498                (push (cons "BEAMER_env" (match-string 1)) props))
 499            (when (org-bound-and-true-p org-beamer-inherited-properties)
 500              (mapc (lambda (p)
 501                      (unless (assoc p props)
 502                        (let ((v (org-entry-get nil p 'inherit)))
 503                          (and v (push (cons p v) props)))))
 504                    org-beamer-inherited-properties))
 505            (put-text-property (point-at-bol) (point-at-eol) 'org-props props)))
 506        (setq org-export-latex-options-plist
 507              (plist-put org-export-latex-options-plist :tags nil))))))
 508
 509 (defun org-beamer-auto-fragile-frames ()
 510   "Mark any frames containing verbatim environments as fragile.
 511 This function will run in the final LaTeX document."
 512   (when org-beamer-export-is-beamer-p
 513     (let (opts)
 514       (goto-char (point-min))
 515       ;; Find something that might be fragile
 516       (while (re-search-forward org-beamer-fragile-re nil t)
 517         (save-excursion
 518           ;; Are we inside a frame here?
 519           (when (and (re-search-backward "^[ \t]*\\\\\\(begin\\|end\\){frame}\\(<[^>]*>\\)?"
 520                                          nil t)
 521                      (equal (match-string 1) "begin"))
 522             ;; yes, inside a frame, make sure "fragile" is one of the options
 523             (goto-char (match-end 0))
 524             (if (not (looking-at "\\[.*?\\]"))
 525                 (insert "[fragile]")
 526               (setq opts (substring (match-string 0) 1 -1))
 527               (delete-region (match-beginning 0) (match-end 0))
 528               (setq opts (org-split-string opts ","))
 529               (add-to-list 'opts "fragile")
 530               (insert "[" (mapconcat 'identity opts ",") "]"))))))))
 531
 532 (defcustom org-beamer-outline-frame-title "Outline"
 533   "Default title of a frame containing an outline."
 534   :group 'org-beamer
 535   :version "24.1"
 536   :type '(string :tag "Outline frame title")
 537   )
 538
 539 (defcustom org-beamer-outline-frame-options nil
 540   "Outline frame options appended after \\begin{frame}.
 541 You might want to put e.g. [allowframebreaks=0.9] here.  Remember to
 542 include square brackets."
 543   :group 'org-beamer
 544   :version "24.1"
 545   :type '(string :tag "Outline frame options")
 546   )
 547
 548 (defun org-beamer-fix-toc ()
 549   "Fix the table of contents by removing the vspace line."
 550   (when org-beamer-export-is-beamer-p
 551     (save-excursion
 552       (goto-char (point-min))
 553       (when (re-search-forward "\\(\\\\setcounter{tocdepth.*\n\\\\tableofcontents.*\n\\)\\(\\\\vspace\\*.*\\)"
 554                                nil t)
 555         (replace-match
 556          (concat "\\\\begin{frame}" org-beamer-outline-frame-options
 557                  "\n\\\\frametitle{"
 558                  org-beamer-outline-frame-title
 559                  "}\n\\1\\\\end{frame}")
 560          t nil)))))
 561
 562 (defun org-beamer-property-changed (property value)
 563   "Track the BEAMER_env property with tags."
 564   (cond
 565    ((equal property "BEAMER_env")
 566     (save-excursion
 567       (org-back-to-heading t)
 568       (let ((tags (org-get-tags)))
 569         (setq tags (delq nil (mapcar (lambda (x)
 570                                        (if (string-match "^B_" x) nil x))
 571                                      tags)))
 572         (org-set-tags-to tags))
 573       (when (and value (stringp value) (string-match "\\S-" value))
 574         (org-toggle-tag (concat "B_" value) 'on))))
 575    ((equal property "BEAMER_col")
 576     (org-toggle-tag "BMCOL" (if (and value (string-match "\\S-" value))
 577                                 'on 'off)))))
 578
 579 (defun org-beamer-select-beamer-code ()
 580   "Take code marked for BEAMER and turn it into marked for LaTeX."
 581   (when org-beamer-export-is-beamer-p
 582     (goto-char (point-min))
 583     (while (re-search-forward
 584             "^\\([ \]*#\\+\\(begin_\\|end_\\)?\\)\\(beamer\\)\\>" nil t)
 585       (replace-match "\\1latex"))))
 586
 587 ;; OK, hook all these functions into appropriate places
 588 (add-hook 'org-export-first-hook
 589           'org-beamer-initialize-open-trackers)
 590 (add-hook 'org-property-changed-functions
 591           'org-beamer-property-changed)
 592 (add-hook 'org-export-latex-after-initial-vars-hook
 593           'org-beamer-after-initial-vars)
 594 (add-hook 'org-export-latex-final-hook
 595           'org-beamer-place-default-actions-for-lists)
 596 (add-hook 'org-export-latex-final-hook
 597           'org-beamer-auto-fragile-frames)
 598 (add-hook 'org-export-latex-final-hook
 599           'org-beamer-fix-toc)
 600 (add-hook 'org-export-latex-final-hook
 601           'org-beamer-amend-header)
 602 (add-hook 'org-export-preprocess-before-selecting-backend-code-hook
 603           'org-beamer-select-beamer-code)
 604
 605 (defun org-insert-beamer-options-template (&optional kind)
 606   "Insert a settings template, to make sure users do this right."
 607   (interactive (progn
 608                  (message "Current [s]ubtree or [g]lobal?")
 609                  (if (equal (read-char-exclusive) ?g)
 610                      (list 'global)
 611                    (list 'subtree))))
 612   (if (eq kind 'subtree)
 613       (progn
 614         (org-back-to-heading t)
 615         (org-reveal)
 616         (org-entry-put nil "LaTeX_CLASS" "beamer")
 617         (org-entry-put nil "LaTeX_CLASS_OPTIONS" "[presentation]")
 618         (org-entry-put nil "EXPORT_FILE_NAME" "presentation.pdf")
 619         (org-entry-put nil "BEAMER_FRAME_LEVEL" (number-to-string
 620                                                  org-beamer-frame-level))
 621         (when org-beamer-themes
 622           (org-entry-put nil "BEAMER_HEADER_EXTRA" org-beamer-themes))
 623         (when org-beamer-column-view-format
 624           (org-entry-put nil "COLUMNS" org-beamer-column-view-format))
 625         (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"))
 626     (insert "#+LaTeX_CLASS: beamer\n")
 627     (insert "#+LaTeX_CLASS_OPTIONS: [presentation]\n")
 628     (insert (format "#+BEAMER_FRAME_LEVEL: %d\n" org-beamer-frame-level) "\n")
 629     (when org-beamer-themes
 630       (insert "#+BEAMER_HEADER_EXTRA: " org-beamer-themes "\n"))
 631     (when org-beamer-column-view-format
 632       (insert "#+COLUMNS: " org-beamer-column-view-format "\n"))
 633     (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")))
 634
 635
 636 (defun org-beamer-allowed-property-values (property)
 637   "Supply allowed values for BEAMER properties."
 638   (cond
 639    ((and (equal property "BEAMER_env")
 640          (not (org-entry-get nil (concat property "_ALL") 'inherit)))
 641     ;; If no allowed values for BEAMER_env have been defined,
 642     ;; supply all defined environments
 643     (mapcar 'car (append org-beamer-environments-extra
 644                          org-beamer-environments-default)))
 645    ((and (equal property "BEAMER_col")
 646          (not (org-entry-get nil (concat property "_ALL") 'inherit)))
 647     ;; If no allowed values for BEAMER_col have been defined,
 648     ;; supply some
 649     '("0.1" "0.2" "0.3" "0.4" "0.5" "0.6" "0.7" "0.8" "0.9" "" ":ETC"))
 650    (t nil)))
 651
 652 (add-hook 'org-property-allowed-value-functions
 653           'org-beamer-allowed-property-values)
 654
 655 (provide 'org-beamer)
 656
 657 ;;; org-beamer.el ends here