emacs-orgmode@gnu.org archives
 help / color / mirror / code / Atom feed
blob dc427deb4401050a387e2b35dcca12b18b877216 48235 bytes (raw)
name: lisp/ox-beamer.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
 
;;; ox-beamer.el --- Beamer Back-End for Org Export Engine

;; Copyright (C) 2007-2013  Free Software Foundation, Inc.

;; Author: Carsten Dominik <carsten.dominik AT gmail DOT com>
;;         Nicolas Goaziou <n.goaziou AT gmail DOT com>
;; Keywords: org, wp, tex

;; GNU Emacs 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 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; This library implements both a Beamer back-end, derived from the
;; LaTeX one and a minor mode easing structure edition of the
;; document.
;;
;; Depending on the desired output format, three commands are provided
;; for export: `org-beamer-export-as-latex' (temporary buffer),
;; `org-beamer-export-to-latex' ("tex" file) and
;; `org-beamer-export-to-pdf' ("pdf" file).
;;
;; This back-end supports every buffer keyword, attribute and options
;; items (see `org-latex-options-alist') already supported by `latex'
;; back-end.  As such, it is suggested to add an entry in
;; `org-latex-classes' variable which is appropriate for Beamer
;; export.
;;
;; On top of this, the `beamer' back-end also introduces the following
;; keywords: "BEAMER_THEME", "BEAMER_COLOR_THEME",
;; "BEAMER_FONT_THEME", "BEAMER_INNER_THEME", "BEAMER_OUTER_THEME" and
;; "BEAMER_HEADER".  All but the latter accept options in square
;; brackets.
;;
;; Moreover, headlines now fall into three categories: sectioning
;; elements, frames and blocks.
;;
;; - Headlines become frames when their level is equal to
;;   `org-beamer-frame-level' (or "H" value in the OPTIONS line).
;;   Though, if a headline in the current tree has a "BEAMER_env"
;;   (see below) property set to either "frame" or "fullframe", its
;;   level overrides the variable.  A "fullframe" is a frame with an
;;   empty (ignored) title.
;;
;; - All frames' children become block environments.  Special block
;;   types can be enforced by setting headline's "BEAMER_env" property
;;   to an appropriate value (see `org-beamer-environments-default'
;;   for supported value and `org-beamer-environments-extra' for
;;   adding more).
;;
;; - As a special case, if the "BEAMER_env" property is set to either
;;   "appendix", "note", "noteNH" or "againframe", the headline will
;;   become, respectively, an appendix, a note (within frame or
;;   between frame, depending on its level), a note with its title
;;   ignored or an againframe command.  In the latter case,
;;   a "BEAMER_ref" property is mandatory in order to refer to the
;;   frame being resumed, and contents are ignored.
;;
;;   Also, a headline with an "ignoreheading" environment will have
;;   its contents only inserted in the output.  This special value is
;;   useful to have data between frames, or to properly close
;;   a "column" environment.
;;
;; Along with "BEAMER_env", headlines also support the "BEAMER_act"
;; and "BEAMER_opt" properties.  The former is translated as an
;; overlay/action specification (or a default overlay specification
;; when enclosed within square brackets) whereas the latter specifies
;; options for the current frame ("fragile" option is added
;; automatically, though).
;;
;; Moreover, headlines handle the "BEAMER_col" property.  Its value
;; should be a decimal number representing the width of the column as
;; a fraction of the total text width.  If the headline has no
;; specific environment, its title will be ignored and its contents
;; will fill the column created.  Otherwise, the block will fill the
;; whole column and the title will be preserved.  Two contiguous
;; headlines with a non-nil "BEAMER_col" value share the same
;; "columns" LaTeX environment.  It will end before the next headline
;; without such a property.  This environment is generated
;; automatically.  Although, it can also be explicitly created, with
;; a special "columns" value for "BEAMER_env" property (if it needs to
;; be set up with some specific options, for example).
;;
;; Every plain list has support for `:environment', `:overlay' and
;; `:options' attributes (through ATTR_BEAMER affiliated keyword).
;; The first one allows to use a different environment, the second
;; sets overlay specifications and the last one inserts optional
;; arguments in current list environment.
;;
;; Table of contents generated from "toc:t" option item are wrapped
;; within a "frame" environment.  Those generated from a TOC keyword
;; aren't.  TOC keywords accept options enclosed within square
;; brackets (e.g. #+TOC: headlines [currentsection]).
;;
;; Eventually, an export snippet with a value enclosed within angular
;; brackets put at the beginning of an element or object whose type is
;; among `bold', `item', `link', `radio-target' and `target' will
;; control its overlay specifications.
;;
;; On the minor mode side, `org-beamer-select-environment' (bound by
;; default to "C-c C-b") and `org-beamer-insert-options-template' are
;; the two entry points.

;;; Code:

(eval-when-compile (require 'cl))
(require 'ox-latex)


\f
;;; User-Configurable Variables

(defgroup org-export-beamer nil
  "Options specific for using the beamer class in LaTeX export."
  :tag "Org Beamer"
  :group 'org-export
  :version "24.2")

(defcustom org-beamer-frame-level 1
  "The level at which headlines become frames.

Headlines at a lower level will be translated into a sectioning
structure.  At a higher level, they will be translated into
blocks.

If a headline with a \"BEAMER_env\" property set to \"frame\" is
found within a tree, its level locally overrides this number.

This variable has no effect on headlines with the \"BEAMER_env\"
property set to either \"ignoreheading\", \"appendix\", or
\"note\", which will respectively, be invisible, become an
appendix or a note.

This integer is relative to the minimal level of a headline
within the parse tree, defined as 1."
  :group 'org-export-beamer
  :type 'integer)

(defcustom org-beamer-frame-default-options ""
  "Default options string to use for frames.
For example, it could be set to \"allowframebreaks\"."
  :group 'org-export-beamer
  :type '(string :tag "[options]"))

(defcustom org-beamer-column-view-format
  "%45ITEM %10BEAMER_env(Env) %10BEAMER_act(Act) %4BEAMER_col(Col) %8BEAMER_opt(Opt)"
  "Column view format that should be used to fill the template."
  :group 'org-export-beamer
  :version "24.4"
  :package-version '(Org . "8.0")
  :type '(choice
	  (const  :tag "Do not insert Beamer column view format" nil)
	  (string :tag "Beamer column view format")))

(defcustom org-beamer-theme "default"
  "Default theme used in Beamer presentations."
  :group 'org-export-beamer
  :version "24.4"
  :package-version '(Org . "8.0")
  :type '(choice
	  (const :tag "Do not insert a Beamer theme" nil)
	  (string :tag "Beamer theme")))

(defcustom org-beamer-environments-extra nil
  "Environments triggered by tags in Beamer export.
Each entry has 4 elements:

name    Name of the environment
key     Selection key for `org-beamer-select-environment'
open    The opening template for the environment, with the following escapes
        %a   the action/overlay specification
        %A   the default action/overlay specification
        %o   the options argument of the template
        %h   the headline text
        %H   if there is headline text, that text in {} braces
        %U   if there is headline text, that text in [] brackets
close   The closing string of the environment."
  :group 'org-export-beamer
  :version "24.4"
  :package-version '(Org . "8.0")
  :type '(repeat
	  (list
	   (string :tag "Environment")
	   (string :tag "Selection key")
	   (string :tag "Begin")
	   (string :tag "End"))))

(defcustom org-beamer-outline-frame-title "Outline"
  "Default title of a frame containing an outline."
  :group 'org-export-beamer
  :type '(string :tag "Outline frame title"))

(defcustom org-beamer-outline-frame-options ""
  "Outline frame options appended after \\begin{frame}.
You might want to put e.g. \"allowframebreaks=0.9\" here."
  :group 'org-export-beamer
  :type '(string :tag "Outline frame options"))


\f
;;; Internal Variables

(defconst org-beamer-column-widths
  "0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.0 :ETC"
"The column widths that should be installed as allowed property values.")

(defconst org-beamer-environments-special
  '(("againframe"     "A")
    ("appendix"       "x")
    ("column"         "c")
    ("columns"        "C")
    ("frame"          "f")
    ("fullframe"      "F")
    ("ignoreheading"  "i")
    ("note"           "n")
    ("noteNH"         "N"))
  "Alist of environments treated in a special way by the back-end.
Keys are environment names, as strings, values are bindings used
in `org-beamer-select-environment'.  Environments listed here,
along with their binding, are hard coded and cannot be modified
through `org-beamer-environments-extra' variable.")

(defconst org-beamer-environments-default
  '(("block"          "b" "\\begin{block}%a{%h}"          "\\end{block}")
    ("alertblock"     "a" "\\begin{alertblock}%a{%h}"     "\\end{alertblock}")
    ("verse"          "v" "\\begin{verse}%a %% %h"        "\\end{verse}")
    ("quotation"      "q" "\\begin{quotation}%a %% %h"    "\\end{quotation}")
    ("quote"          "Q" "\\begin{quote}%a %% %h"        "\\end{quote}")
    ("structureenv"   "s" "\\begin{structureenv}%a %% %h" "\\end{structureenv}")
    ("theorem"        "t" "\\begin{theorem}%a%U"          "\\end{theorem}")
    ("definition"     "d" "\\begin{definition}%a%U"       "\\end{definition}")
    ("example"        "e" "\\begin{example}%a%U"          "\\end{example}")
    ("exampleblock"   "E" "\\begin{exampleblock}%a{%h}"   "\\end{exampleblock}")
    ("proof"          "p" "\\begin{proof}%a%U"            "\\end{proof}")
    ("beamercolorbox" "o" "\\begin{beamercolorbox}%o{%h}" "\\end{beamercolorbox}"))
  "Environments triggered by properties in Beamer export.
These are the defaults - for user definitions, see
`org-beamer-environments-extra'.")

(defconst org-beamer-verbatim-elements
  '(code example-block fixed-width inline-src-block src-block verbatim)
  "List of element or object types producing verbatim text.
This is used internally to determine when a frame should have the
\"fragile\" option.")


\f
;;; Internal functions

(defun org-beamer--normalize-argument (argument type)
  "Return ARGUMENT string with proper boundaries.

TYPE is a symbol among the following:
`action'    Return ARGUMENT within angular brackets.
`defaction' Return ARGUMENT within both square and angular brackets.
`option'    Return ARGUMENT within square brackets."
  (if (not (string-match "\\S-" argument)) ""
    (case type
      (action (if (string-match "\\`<.*>\\'" argument) argument
		(format "<%s>" argument)))
      (defaction (cond
		  ((string-match "\\`\\[<.*>\\]\\'" argument) argument)
		  ((string-match "\\`<.*>\\'" argument)
		   (format "[%s]" argument))
		  ((string-match "\\`\\[\\(.*\\)\\]\\'" argument)
		   (format "[<%s>]" (match-string 1 argument)))
		  (t (format "[<%s>]" argument))))
      (option (if (string-match "\\`\\[.*\\]\\'" argument) argument
		(format "[%s]" argument)))
      (otherwise argument))))

(defun org-beamer--element-has-overlay-p (element)
  "Non-nil when ELEMENT has an overlay specified.
An element has an overlay specification when it starts with an
`beamer' export-snippet whose value is between angular brackets.
Return overlay specification, as a string, or nil."
  (let ((first-object (car (org-element-contents element))))
    (when (eq (org-element-type first-object) 'export-snippet)
      (let ((value (org-element-property :value first-object)))
	(and (string-match "\\`<.*>\\'" value) value)))))


\f
;;; Define Back-End

(org-export-define-derived-backend 'beamer 'latex
  :export-block "BEAMER"
  :menu-entry
  '(?l 1
       ((?B "As LaTeX buffer (Beamer)" org-beamer-export-as-latex)
	(?b "As LaTeX file (Beamer)" org-beamer-export-to-latex)
	(?P "As PDF file (Beamer)" org-beamer-export-to-pdf)
	(?O "As PDF file and open (Beamer)"
	    (lambda (a s v b)
	      (if a (org-beamer-export-to-pdf t s v b)
		(org-open-file (org-beamer-export-to-pdf nil s v b)))))))
  :options-alist
  '((:beamer-theme "BEAMER_THEME" nil org-beamer-theme)
    (:beamer-color-theme "BEAMER_COLOR_THEME" nil nil t)
    (:beamer-font-theme "BEAMER_FONT_THEME" nil nil t)
    (:beamer-inner-theme "BEAMER_INNER_THEME" nil nil t)
    (:beamer-outer-theme "BEAMER_OUTER_THEME" nil nil t)
    (:beamer-header-extra "BEAMER_HEADER" nil nil newline)
    (:headline-levels nil "H" org-beamer-frame-level))
  :translate-alist '((bold . org-beamer-bold)
		     (export-block . org-beamer-export-block)
		     (export-snippet . org-beamer-export-snippet)
		     (headline . org-beamer-headline)
		     (item . org-beamer-item)
		     (keyword . org-beamer-keyword)
		     (link . org-beamer-link)
		     (plain-list . org-beamer-plain-list)
		     (radio-target . org-beamer-radio-target)
		     (target . org-beamer-target)
		     (template . org-beamer-template)))


\f
;;; Transcode Functions

;;;; Bold

(defun org-beamer-bold (bold contents info)
  "Transcode BLOCK object into Beamer code.
CONTENTS is the text being bold.  INFO is a plist used as
a communication channel."
  (format "\\alert%s{%s}"
	  (or (org-beamer--element-has-overlay-p bold) "")
	  contents))


;;;; Export Block

(defun org-beamer-export-block (export-block contents info)
  "Transcode an EXPORT-BLOCK element into Beamer code.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (when (member (org-element-property :type export-block) '("BEAMER" "LATEX"))
    (org-remove-indentation (org-element-property :value export-block))))


;;;; Export Snippet

(defun org-beamer-export-snippet (export-snippet contents info)
  "Transcode an EXPORT-SNIPPET object into Beamer code.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (let ((backend (org-export-snippet-backend export-snippet))
	(value (org-element-property :value export-snippet)))
    ;; Only "latex" and "beamer" snippets are retained.
    (cond ((eq backend 'latex) value)
	  ;; Ignore "beamer" snippets specifying overlays.
	  ((and (eq backend 'beamer)
		(or (org-export-get-previous-element export-snippet info)
		    (not (string-match "\\`<.*>\\'" value))))
	   value))))


;;;; Headline
;;
;; The main function to translate a headline is
;; `org-beamer-headline'.
;;
;; Depending on the level at which a headline is considered as
;; a frame (given by `org-beamer--frame-level'), the headline is
;; either a section (`org-beamer--format-section'), a frame
;; (`org-beamer--format-frame') or a block
;; (`org-beamer--format-block').
;;
;; `org-beamer-headline' also takes care of special environments
;; like "ignoreheading", "note", "noteNH", "appendix" and
;; "againframe".

(defun org-beamer--get-label (headline info)
  "Return label for HEADLINE, as a string.

INFO is a plist used as a communication channel.

The value is either the label specified in \"BEAMER_opt\"
property, or a fallback value built from headline's number.  This
function assumes HEADLINE will be treated as a frame."
  (let ((opt (org-element-property :BEAMER_OPT headline)))
    (if (and (org-string-nw-p opt)
	     (string-match "\\(?:^\\|,\\)label=\\(.*?\\)\\(?:$\\|,\\)" opt))
	(match-string 1 opt)
      (format "sec-%s"
	      (mapconcat 'number-to-string
			 (org-export-get-headline-number headline info)
			 "-")))))

(defun org-beamer--frame-level (headline info)
  "Return frame level in subtree containing HEADLINE.
INFO is a plist used as a communication channel."
  (or
   ;; 1. Look for "frame" environment in parents, starting from the
   ;;    farthest.
   (catch 'exit
     (mapc (lambda (parent)
	     (let ((env (org-element-property :BEAMER_ENV parent)))
	       (when (and env (member (downcase env) '("frame" "fullframe")))
		 (throw 'exit (org-export-get-relative-level parent info)))))
	   (nreverse (org-export-get-genealogy headline)))
     nil)
   ;; 2. Look for "frame" environment in HEADLINE.
   (let ((env (org-element-property :BEAMER_ENV headline)))
     (and env (member (downcase env) '("frame" "fullframe"))
	  (org-export-get-relative-level headline info)))
   ;; 3. Look for "frame" environment in sub-tree.
   (org-element-map headline 'headline
     (lambda (hl)
       (let ((env (org-element-property :BEAMER_ENV hl)))
	 (when (and env (member (downcase env) '("frame" "fullframe")))
	   (org-export-get-relative-level hl info))))
     info 'first-match)
   ;; 4. No "frame" environment in tree: use default value.
   (plist-get info :headline-levels)))

(defun org-beamer--format-section (headline contents info)
  "Format HEADLINE as a sectioning part.
CONTENTS holds the contents of the headline.  INFO is a plist
used as a communication channel."
  ;; Use `latex' back-end output, inserting overlay specifications
  ;; if possible.
  (let ((latex-headline (org-export-with-backend 'latex headline contents info))
	(mode-specs (org-element-property :BEAMER_ACT headline)))
    (if (and mode-specs
	     (string-match "\\`\\\\\\(.*?\\)\\(?:\\*\\|\\[.*\\]\\)?{"
			   latex-headline))
	(replace-match (concat (match-string 1 latex-headline)
			       (format "<%s>" mode-specs))
		       nil nil latex-headline 1)
      latex-headline)))

(defun org-beamer--format-frame (headline contents info)
  "Format HEADLINE as a frame.
CONTENTS holds the contents of the headline.  INFO is a plist
used as a communication channel."
  (let ((fragilep
	 ;; FRAGILEP is non-nil when HEADLINE contains an element
	 ;; among `org-beamer-verbatim-elements'.
	 (org-element-map headline org-beamer-verbatim-elements 'identity
			  info 'first-match)))
    (concat "\\begin{frame}"
	    ;; Overlay specification, if any. When surrounded by
	    ;; square brackets, consider it as a default
	    ;; specification.
	    (let ((action (org-element-property :BEAMER_ACT headline)))
	      (cond
	       ((not action) "")
	       ((string-match "\\`\\[.*\\]\\'" action )
		(org-beamer--normalize-argument action 'defaction))
	       (t (org-beamer--normalize-argument action 'action))))
	    ;; Options, if any.
	    (let* ((beamer-opt (org-element-property :BEAMER_OPT headline))
		   (options
		    ;; Collect options from default value and headline's
		    ;; properties.  Also add a label for links.
		    (append
		     (org-split-string org-beamer-frame-default-options ",")
		     (and beamer-opt
			  (org-split-string
			   ;; Remove square brackets if user provided
			   ;; them.
			   (and (string-match "^\\[?\\(.*\\)\\]?$" beamer-opt)
				(match-string 1 beamer-opt))
			   ","))
		     ;; Provide an automatic label for the frame
		     ;; unless the user specified one.
		     (unless (and beamer-opt
				  (string-match "\\(^\\|,\\)label=" beamer-opt))
		       (list
			(format "label=%s"
				(org-beamer--get-label headline info)))))))
	      ;; Change options list into a string.
	      (org-beamer--normalize-argument
	       (mapconcat
		'identity
		(if (or (not fragilep) (member "fragile" options)) options
		  (cons "fragile" options))
		",")
	       'option))
	    ;; Title.
	    (let ((env (org-element-property :BEAMER_ENV headline)))
	      (format "{%s}"
		      (if (and env (equal (downcase env) "fullframe")) ""
			(org-export-data
			 (org-element-property :title headline) info))))
	    "\n"
	    ;; The following workaround is required in fragile frames
	    ;; as Beamer will append "\par" to the beginning of the
	    ;; contents.  So we need to make sure the command is
	    ;; separated from the contents by at least one space.  If
	    ;; it isn't, it will create "\parfirst-word" command and
	    ;; remove the first word from the contents in the PDF
	    ;; output.
	    (if (not fragilep) contents
	      (replace-regexp-in-string "\\`\n*" "\\& " contents))
	    "\\end{frame}")))

(defun org-beamer--format-block (headline contents info)
  "Format HEADLINE as a block.
CONTENTS holds the contents of the headline.  INFO is a plist
used as a communication channel."
  (let* ((column-width (org-element-property :BEAMER_COL headline))
	 ;; ENVIRONMENT defaults to "block" if none is specified and
	 ;; there is no column specification.  If there is a column
	 ;; specified but still no explicit environment, ENVIRONMENT
	 ;; is "column".
	 (environment (let ((env (org-element-property :BEAMER_ENV headline)))
			(cond
			 ;; "block" is the fallback environment.
			 ((and (not env) (not column-width)) "block")
			 ;; "column" only.
			 ((not env) "column")
			 ;; Use specified environment.
			 (t (downcase env)))))
	 (env-format (unless (member environment '("column" "columns"))
		       (assoc environment
			      (append org-beamer-environments-special
				      org-beamer-environments-extra
				      org-beamer-environments-default))))
	 (title (org-export-data (org-element-property :title headline) info))
	 (options (let ((options (org-element-property :BEAMER_OPT headline)))
		    (if (not options) ""
		      (org-beamer--normalize-argument options 'option))))
	 ;; Start a "columns" environment when explicitly requested or
	 ;; when there is no previous headline or the previous
	 ;; headline do not have a BEAMER_column property.
	 (parent-env (org-element-property
		      :BEAMER_ENV (org-export-get-parent-headline headline)))
	 (start-columns-p
	  (or (equal environment "columns")
	      (and column-width
		   (not (and parent-env
			     (equal (downcase parent-env) "columns")))
		   (or (org-export-first-sibling-p headline info)
		       (not (org-element-property
			     :BEAMER_COL
			     (org-export-get-previous-element
			      headline info)))))))
	 ;; End the "columns" environment when explicitly requested or
	 ;; when there is no next headline or the next headline do not
	 ;; have a BEAMER_column property.
	 (end-columns-p
	  (or (equal environment "columns")
	      (and column-width
		   (not (and parent-env
			     (equal (downcase parent-env) "columns")))
		   (or (org-export-last-sibling-p headline info)
		       (not (org-element-property
			     :BEAMER_COL
			     (org-export-get-next-element headline info))))))))
    (concat
     (when start-columns-p
       ;; Column can accept options only when the environment is
       ;; explicitly defined.
       (if (not (equal environment "columns")) "\\begin{columns}\n"
	 (format "\\begin{columns}%s\n" options)))
     (when column-width
       (format "\\begin{column}%s{%s}\n"
	       ;; One can specify placement for column only when
	       ;; HEADLINE stands for a column on its own.
	       (if (equal environment "column") options "")
	       (format "%s\\textwidth" column-width)))
     ;; Block's opening string.
     (when env-format
       (concat
	(org-fill-template
	 (nth 2 env-format)
	 (nconc
	  ;; If BEAMER_act property has its value enclosed in square
	  ;; brackets, it is a default overlay specification and
	  ;; overlay specification is empty.  Otherwise, it is an
	  ;; overlay specification and the default one is nil.
	  (let ((action (org-element-property :BEAMER_ACT headline)))
	    (cond
	     ((not action) (list (cons "a" "") (cons "A" "")))
	     ((string-match "\\`\\[.*\\]\\'" action)
	      (list
	       (cons "A" (org-beamer--normalize-argument action 'defaction))
	       (cons "a" "")))
	     (t
	      (list (cons "a" (org-beamer--normalize-argument action 'action))
		    (cons "A" "")))))
	  (list (cons "o" options)
		(cons "h" title)
		(cons "H" (if (equal title "") "" (format "{%s}" title)))
		(cons "U" (if (equal title "") "" (format "[%s]" title))))))
	"\n"))
     contents
     ;; Block's closing string.
     (when environment (concat (nth 3 env-format) "\n"))
     (when column-width "\\end{column}\n")
     (when end-columns-p "\\end{columns}"))))

(defun org-beamer-headline (headline contents info)
  "Transcode HEADLINE element into Beamer code.
CONTENTS is the contents of the headline.  INFO is a plist used
as a communication channel."
  (unless (org-element-property :footnote-section-p headline)
    (let ((level (org-export-get-relative-level headline info))
	  (frame-level (org-beamer--frame-level headline info))
	  (environment (let ((env (org-element-property :BEAMER_ENV headline)))
			 (if (stringp env) (downcase env) "block"))))
      (cond
       ;; Case 1: Resume frame specified by "BEAMER_ref" property.
       ((equal environment "againframe")
	(let ((ref (org-element-property :BEAMER_REF headline)))
	  ;; Reference to frame being resumed is mandatory.  Ignore
	  ;; the whole headline if it isn't provided.
	  (when (org-string-nw-p ref)
	    (concat "\\againframe"
		    ;; Overlay specification.
		    (let ((overlay (org-element-property :BEAMER_ACT headline)))
		      (when overlay
			(org-beamer--normalize-argument
			 overlay
			 (if (string-match "^\\[.*\\]$" overlay) 'defaction
			   'action))))
		    ;; Options.
		    (let ((options (org-element-property :BEAMER_OPT headline)))
		      (when options
			(org-beamer--normalize-argument options 'option)))
		    ;; Resolve reference provided by "BEAMER_ref"
		    ;; property.  This is done by building a minimal fake
		    ;; link and calling the appropriate resolve function,
		    ;; depending on the reference syntax.
		    (let* ((type
			    (progn
			      (string-match "^\\(id:\\|#\\|\\*\\)?\\(.*\\)" ref)
			      (cond
			       ((or (not (match-string 1 ref))
				    (equal (match-string 1 ref) "*")) 'fuzzy)
			       ((equal (match-string 1 ref) "id:") 'id)
			       (t 'custom-id))))
			   (link (list 'link (list :path (match-string 2 ref))))
			   (target (if (eq type 'fuzzy)
				       (org-export-resolve-fuzzy-link link info)
				     (org-export-resolve-id-link link info))))
		      ;; Now use user-defined label provided in TARGET
		      ;; headline, or fallback to standard one.
		      (format "{%s}" (org-beamer--get-label target info)))))))
       ;; Case 2: Creation of an appendix is requested.
       ((equal environment "appendix")
	(concat "\\appendix"
		(org-element-property :BEAMER_ACT headline)
		"\n"
		(make-string (org-element-property :pre-blank headline) ?\n)
		contents))
       ;; Case 3: Ignore heading.
       ((equal environment "ignoreheading")
	(concat (make-string (org-element-property :pre-blank headline) ?\n)
		contents))
       ;; Case 4: HEADLINE is a note.
       ((member environment '("note" "noteNH"))
	(format "\\note{%s}"
		(concat (and (equal environment "note")
			     (concat
			      (org-export-data
			       (org-element-property :title headline) info)
			      "\n"))
			(org-trim contents))))
       ;; Case 5: HEADLINE is a frame.
       ((= level frame-level)
	(org-beamer--format-frame headline contents info))
       ;; Case 6: Regular section, extracted from
       ;; `org-latex-classes'.
       ((< level frame-level)
	(org-beamer--format-section headline contents info))
       ;; Case 7: Otherwise, HEADLINE is a block.
       (t (org-beamer--format-block headline contents info))))))


;;;; Item

(defun org-beamer-item (item contents info)
  "Transcode an ITEM element into Beamer code.
CONTENTS holds the contents of the item.  INFO is a plist holding
contextual information."
  (let ((action (let ((first-element (car (org-element-contents item))))
		  (and (eq (org-element-type first-element) 'paragraph)
		       (org-beamer--element-has-overlay-p first-element))))
	(output (org-export-with-backend 'latex item contents info)))
    (if (not action) output
      ;; If the item starts with a paragraph and that paragraph starts
      ;; with an export snippet specifying an overlay, insert it after
      ;; \item command.
      (replace-regexp-in-string "\\\\item" (concat "\\\\item" action) output))))


;;;; Keyword

(defun org-beamer-keyword (keyword contents info)
  "Transcode a KEYWORD element into Beamer code.
CONTENTS is nil.  INFO is a plist used as a communication
channel."
  (let ((key (org-element-property :key keyword))
	(value (org-element-property :value keyword)))
    ;; Handle specifically BEAMER and TOC (headlines only) keywords.
    ;; Otherwise, fallback to `latex' back-end.
    (cond
     ((equal key "BEAMER") value)
     ((and (equal key "TOC") (string-match "\\<headlines\\>" value))
      (let ((depth (or (and (string-match "[0-9]+" value)
			    (string-to-number (match-string 0 value)))
		       (plist-get info :with-toc)))
	    (options (and (string-match "\\[.*?\\]" value)
			  (match-string 0 value))))
	(concat
	 (when (wholenump depth) (format "\\setcounter{tocdepth}{%s}\n" depth))
	 "\\tableofcontents" options)))
     (t (org-export-with-backend 'latex keyword contents info)))))


;;;; Link

(defun org-beamer-link (link contents info)
  "Transcode a LINK object into Beamer code.
CONTENTS is the description part of the link.  INFO is a plist
used as a communication channel."
  (let ((type (org-element-property :type link))
	(path (org-element-property :path link)))
    ;; Use \hyperlink command for all internal links.
    (cond
     ((equal type "radio")
      (let ((destination (org-export-resolve-radio-link link info)))
	(when destination
	  (format "\\hyperlink%s{%s}{%s}"
		  (or (org-beamer--element-has-overlay-p link) "")
		  (org-export-solidify-link-text path)
		  (org-export-data (org-element-contents destination) info)))))
     ((and (member type '("custom-id" "fuzzy" "id"))
	   (let ((destination (if (string= type "fuzzy")
				  (org-export-resolve-fuzzy-link link info)
				(org-export-resolve-id-link link info))))
	     (case (org-element-type destination)
	       (headline
		(let ((label
		       (format "sec-%s"
			       (mapconcat
				'number-to-string
				(org-export-get-headline-number
				 destination info)
				"-"))))
		  (if (and (plist-get info :section-numbers) (not contents))
		      (format "\\ref{%s}" label)
		    (format "\\hyperlink%s{%s}{%s}"
			    (or (org-beamer--element-has-overlay-p link) "")
			    label
			    contents))))
	       (target
		(let ((path (org-export-solidify-link-text path)))
		  (if (not contents) (format "\\ref{%s}" path)
		    (format "\\hyperlink%s{%s}{%s}"
			    (or (org-beamer--element-has-overlay-p link) "")
			    path
			    contents))))))))
     ;; Otherwise, use `latex' back-end.
     (t (org-export-with-backend 'latex link contents info)))))


;;;; Plain List
;;
;; Plain lists support `:environment', `:overlay' and `:options'
;; attributes.

(defun org-beamer-plain-list (plain-list contents info)
  "Transcode a PLAIN-LIST element into Beamer code.
CONTENTS is the contents of the list.  INFO is a plist holding
contextual information."
  (let* ((type (org-element-property :type plain-list))
	 (attributes (org-combine-plists
		      (org-export-read-attribute :attr_latex plain-list)
		      (org-export-read-attribute :attr_beamer plain-list)))
	 (latex-type (let ((env (plist-get attributes :environment)))
		       (cond (env)
			     ((eq type 'ordered) "enumerate")
			     ((eq type 'descriptive) "description")
			     (t "itemize")))))
    (org-latex--wrap-label
     plain-list
     (format "\\begin{%s}%s%s\n%s\\end{%s}"
	     latex-type
	     ;; Default overlay specification, if any.
	     (org-beamer--normalize-argument
	      (or (plist-get attributes :overlay) "")
	      'defaction)
	     ;; Second optional argument depends on the list type.
	     (org-beamer--normalize-argument
	      (or (plist-get attributes :options) "")
	      'option)
	     ;; Eventually insert contents and close environment.
	     contents
	     latex-type))))


;;;; Radio Target

(defun org-beamer-radio-target (radio-target text info)
  "Transcode a RADIO-TARGET object into Beamer code.
TEXT is the text of the target.  INFO is a plist holding
contextual information."
  (format "\\hypertarget%s{%s}{%s}"
	  (or (org-beamer--element-has-overlay-p radio-target) "")
	  (org-export-solidify-link-text
	   (org-element-property :value radio-target))
	  text))


;;;; Target

(defun org-beamer-target (target contents info)
  "Transcode a TARGET object into Beamer code.
CONTENTS is nil.  INFO is a plist holding contextual
information."
  (format "\\hypertarget{%s}{}"
	  (org-export-solidify-link-text (org-element-property :value target))))


;;;; Template
;;
;; Template used is similar to the one used in `latex' back-end,
;; excepted for the table of contents and Beamer themes.

(defun org-beamer-template (contents info)
  "Return complete document string after Beamer conversion.
CONTENTS is the transcoded contents string.  INFO is a plist
holding export options."
  (let ((title (org-export-data (plist-get info :title) info)))
    (concat
     ;; 1. Time-stamp.
     (and (plist-get info :time-stamp-file)
	  (format-time-string "%% Created %Y-%m-%d %a %H:%M\n"))
     ;; 2. Document class and packages.
     (let ((class (plist-get info :latex-class))
	   (class-options (plist-get info :latex-class-options)))
       (org-element-normalize-string
	(let* ((header (nth 1 (assoc class org-latex-classes)))
	       (document-class-string
		(and (stringp header)
		     (if (not class-options) header
		       (replace-regexp-in-string
			"^[ \t]*\\\\documentclass\\(\\(\\[[^]]*\\]\\)?\\)"
			class-options header t nil 1)))))
	  (if (not document-class-string)
	      (user-error "Unknown LaTeX class `%s'" class)
	    (org-latex-guess-babel-language
	     (org-latex-guess-inputenc
	      (org-splice-latex-header
	       document-class-string
	       org-latex-default-packages-alist
	       org-latex-packages-alist nil
	       (concat (plist-get info :latex-header)
		       (plist-get info :latex-header-extra)
		       (plist-get info :beamer-header-extra))))
	     info)))))
     ;; 3. Insert themes.
     (let ((format-theme
	    (function
	     (lambda (prop command)
	       (let ((theme (plist-get info prop)))
		 (when theme
		   (concat command
			   (if (not (string-match "\\[.*\\]" theme))
			       (format "{%s}\n" theme)
			     (format "%s{%s}\n"
				     (match-string 0 theme)
				     (org-trim
				      (replace-match "" nil nil theme)))))))))))
       (mapconcat (lambda (args) (apply format-theme args))
		  '((:beamer-theme "\\usetheme")
		    (:beamer-color-theme "\\usecolortheme")
		    (:beamer-font-theme "\\usefonttheme")
		    (:beamer-inner-theme "\\useinnertheme")
		    (:beamer-outer-theme "\\useoutertheme"))
		  ""))
     ;; 4. Possibly limit depth for headline numbering.
     (let ((sec-num (plist-get info :section-numbers)))
       (when (integerp sec-num)
	 (format "\\setcounter{secnumdepth}{%d}\n" sec-num)))
     ;; 5. Author.
     (let ((author (and (plist-get info :with-author)
			(let ((auth (plist-get info :author)))
			  (and auth (org-export-data auth info)))))
	   (email (and (plist-get info :with-email)
		       (org-export-data (plist-get info :email) info))))
       (cond ((and author email (not (string= "" email)))
	      (format "\\author{%s\\thanks{%s}}\n" author email))
	     (author (format "\\author{%s}\n" author))
	     (t "\\author{}\n")))
     ;; 6. Date.
     (let ((date (and (plist-get info :with-date) (plist-get info :date))))
       (format "\\date{%s}\n"
	       (cond ((not date) "")
		     ;; If `:date' consists in a single timestamp and
		     ;; `:date-format' is provided, apply it.
		     ((and (plist-get info :date-format)
			   (not (cdr date))
			   (eq (org-element-type (car date)) 'timestamp))
		      (org-timestamp-format
		       (car date) (plist-get info :date-format)))
		     (t (org-export-data date info)))))
     ;; 7. Title
     (format "\\title{%s}\n" title)
     ;; 8. Hyperref options.
     (when (plist-get info :latex-hyperref-p)
       (format "\\hypersetup{\n  pdfkeywords={%s},\n  pdfsubject={%s},\n  pdfcreator={%s}}\n"
	       (or (plist-get info :keywords) "")
	       (or (plist-get info :description) "")
	       (if (not (plist-get info :with-creator)) ""
		 (plist-get info :creator))))
     ;; 9. Document start.
     "\\begin{document}\n\n"
     ;; 10. Title command.
     (org-element-normalize-string
      (cond ((string= "" title) nil)
	    ((not (stringp org-latex-title-command)) nil)
	    ((string-match "\\(?:[^%]\\|^\\)%s"
			   org-latex-title-command)
	     (format org-latex-title-command title))
	    (t org-latex-title-command)))
     ;; 11. Table of contents.
     (let ((depth (plist-get info :with-toc)))
       (when depth
	 (concat
	  (format "\\begin{frame}%s{%s}\n"
		  (org-beamer--normalize-argument
		   org-beamer-outline-frame-options 'option)
		  org-beamer-outline-frame-title)
	  (when (wholenump depth)
	    (format "\\setcounter{tocdepth}{%d}\n" depth))
	  "\\tableofcontents\n"
	  "\\end{frame}\n\n")))
     ;; 12. Document's body.
     contents
     ;; 13. Creator.
     (let ((creator-info (plist-get info :with-creator)))
       (cond
	((not creator-info) "")
	((eq creator-info 'comment)
	 (format "%% %s\n" (plist-get info :creator)))
	(t (concat (plist-get info :creator) "\n"))))
     ;; 14. Document end.
     "\\end{document}")))


\f
;;; Minor Mode


(defvar org-beamer-mode-map (make-sparse-keymap)
  "The keymap for `org-beamer-mode'.")
(define-key org-beamer-mode-map "\C-c\C-b" 'org-beamer-select-environment)

;;;###autoload
(define-minor-mode org-beamer-mode
  "Support for editing Beamer oriented Org mode files."
  nil " Bm" 'org-beamer-mode-map)

(when (fboundp 'font-lock-add-keywords)
  (font-lock-add-keywords
   'org-mode
   '((":\\(B_[a-z]+\\|BMCOL\\):" 1 'org-beamer-tag prepend))
   'prepend))

(defface org-beamer-tag '((t (:box (:line-width 1 :color grey40))))
  "The special face for beamer tags."
  :group 'org-export-beamer)

(defun org-beamer-property-changed (property value)
  "Track the BEAMER_env property with tags.
PROPERTY is the name of the modified property.  VALUE is its new
value."
  (cond
   ((equal property "BEAMER_env")
    (save-excursion
      (org-back-to-heading t)
      ;; Filter out Beamer-related tags and install environment tag.
      (let ((tags (org-remove-if (lambda (x) (string-match "^B_" x))
				 (org-get-tags)))
	    (env-tag (and (org-string-nw-p value) (concat "B_" value))))
	(org-set-tags-to (if env-tag (cons env-tag tags) tags))
	(when env-tag (org-toggle-tag env-tag 'on)))))
   ((equal property "BEAMER_col")
    (org-toggle-tag "BMCOL" (if (org-string-nw-p value) 'on 'off)))))

(add-hook 'org-property-changed-functions 'org-beamer-property-changed)

(defun org-beamer-allowed-property-values (property)
  "Supply allowed values for PROPERTY."
  (cond
   ((and (equal property "BEAMER_env")
	 (not (org-entry-get nil (concat property "_ALL") 'inherit)))
    ;; If no allowed values for BEAMER_env have been defined,
    ;; supply all defined environments
    (mapcar 'car (append org-beamer-environments-special
			 org-beamer-environments-extra
			 org-beamer-environments-default)))
   ((and (equal property "BEAMER_col")
	 (not (org-entry-get nil (concat property "_ALL") 'inherit)))
    ;; If no allowed values for BEAMER_col have been defined,
    ;; supply some
    (org-split-string org-beamer-column-widths " "))))

(add-hook 'org-property-allowed-value-functions
	  'org-beamer-allowed-property-values)


\f
;;; Commands

;;;###autoload
(defun org-beamer-export-as-latex
  (&optional async subtreep visible-only body-only ext-plist)
  "Export current buffer as a Beamer buffer.

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting buffer should be accessible
through the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"\\begin{document}\" and \"\\end{document}\".

EXT-PLIST, when provided, is a property list with external
parameters overriding Org default settings, but still inferior to
file-local settings.

Export is done in a buffer named \"*Org BEAMER Export*\", which
will be displayed when `org-export-show-temporary-export-buffer'
is non-nil."
  (interactive)
  (if async
      (org-export-async-start
	  (lambda (output)
	    (with-current-buffer (get-buffer-create "*Org BEAMER Export*")
	      (erase-buffer)
	      (insert output)
	      (goto-char (point-min))
	      (LaTeX-mode)
	      (org-export-add-to-stack (current-buffer) 'beamer)))
	`(org-export-as 'beamer ,subtreep ,visible-only ,body-only
			',ext-plist))
    (let ((outbuf (org-export-to-buffer
		   'beamer "*Org BEAMER Export*"
		   subtreep visible-only body-only ext-plist)))
      (with-current-buffer outbuf (LaTeX-mode))
      (when org-export-show-temporary-export-buffer
	(switch-to-buffer-other-window outbuf)))))

;;;###autoload
(defun org-beamer-export-to-latex
  (&optional async subtreep visible-only body-only ext-plist)
  "Export current buffer as a Beamer presentation (tex).

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"\\begin{document}\" and \"\\end{document}\".

EXT-PLIST, when provided, is a property list with external
parameters overriding Org default settings, but still inferior to
file-local settings.

Return output file's name."
  (interactive)
  (let ((outfile (org-export-output-file-name ".tex" subtreep)))
    (if async
	(org-export-async-start
	    (lambda (f) (org-export-add-to-stack f 'beamer))
	  `(expand-file-name
	    (org-export-to-file
	     'beamer ,outfile ,subtreep ,visible-only ,body-only
	     ',ext-plist)))
      (org-export-to-file
       'beamer outfile subtreep visible-only body-only ext-plist))))

;;;###autoload
(defun org-beamer-export-to-pdf
  (&optional async subtreep visible-only body-only ext-plist)
  "Export current buffer as a Beamer presentation (PDF).

If narrowing is active in the current buffer, only export its
narrowed part.

If a region is active, export that region.

A non-nil optional argument ASYNC means the process should happen
asynchronously.  The resulting file should be accessible through
the `org-export-stack' interface.

When optional argument SUBTREEP is non-nil, export the sub-tree
at point, extracting information from the headline properties
first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only write code
between \"\\begin{document}\" and \"\\end{document}\".

EXT-PLIST, when provided, is a property list with external
parameters overriding Org default settings, but still inferior to
file-local settings.

Return PDF file's name."
  (interactive)
  (if async
      (let ((outfile (org-export-output-file-name ".tex" subtreep)))
	(org-export-async-start
	    (lambda (f) (org-export-add-to-stack f 'beamer))
	  `(expand-file-name
	    (org-latex-compile
	     (org-export-to-file
	      'beamer ,outfile ,subtreep ,visible-only ,body-only
	      ',ext-plist)))))
    (org-latex-compile
     (org-beamer-export-to-latex
      nil subtreep visible-only body-only ext-plist))))

;;;###autoload
(defun org-beamer-select-environment ()
  "Select the environment to be used by beamer for this entry.
While this uses (for convenience) a tag selection interface, the
result of this command will be that the BEAMER_env *property* of
the entry is set.

In addition to this, the command will also set a tag as a visual
aid, but the tag does not have any semantic meaning."
  (interactive)
  ;; Make sure `org-beamer-environments-special' has a higher
  ;; priority than `org-beamer-environments-extra'.
  (let* ((envs (append org-beamer-environments-special
		       org-beamer-environments-extra
		       org-beamer-environments-default))
	 (org-tag-alist
	  (append '((:startgroup))
		  (mapcar (lambda (e) (cons (concat "B_" (car e))
				       (string-to-char (nth 1 e))))
			  envs)
		  '((:endgroup))
		  '(("BMCOL" . ?|))))
	 (org-fast-tag-selection-single-key t))
    (org-set-tags)
    (let ((tags (or (ignore-errors (org-get-tags-string)) "")))
      (cond
       ;; For a column, automatically ask for its width.
       ((eq org-last-tag-selection-key ?|)
	(if (string-match ":BMCOL:" tags)
	    (org-set-property "BEAMER_col" (read-string "Column width: "))
	  (org-delete-property "BEAMER_col")))
       ;; For an "againframe" section, automatically ask for reference
       ;; to resumed frame and overlay specifications.
       ((eq org-last-tag-selection-key ?A)
	(if (equal (org-entry-get nil "BEAMER_env") "againframe")
	    (progn (org-entry-delete nil "BEAMER_env")
		   (org-entry-delete nil "BEAMER_ref")
		   (org-entry-delete nil "BEAMER_act"))
	  (org-entry-put nil "BEAMER_env" "againframe")
	  (org-set-property
	   "BEAMER_ref"
	   (read-string "Frame reference (*Title, #custom-id, id:...): "))
	  (org-set-property "BEAMER_act"
			    (read-string "Overlay specification: "))))
       ((string-match (concat ":B_\\(" (mapconcat 'car envs "\\|") "\\):") tags)
	(org-entry-put nil "BEAMER_env" (match-string 1 tags)))
       (t (org-entry-delete nil "BEAMER_env"))))))

;;;###autoload
(defun org-beamer-insert-options-template (&optional kind)
  "Insert a settings template, to make sure users do this right."
  (interactive (progn
		 (message "Current [s]ubtree or [g]lobal?")
		 (if (eq (read-char-exclusive) ?g) (list 'global)
		   (list 'subtree))))
  (if (eq kind 'subtree)
      (progn
	(org-back-to-heading t)
	(org-reveal)
	(org-entry-put nil "EXPORT_LaTeX_CLASS" "beamer")
	(org-entry-put nil "EXPORT_LaTeX_CLASS_OPTIONS" "[presentation]")
	(org-entry-put nil "EXPORT_FILE_NAME" "presentation.pdf")
	(when org-beamer-column-view-format
	  (org-entry-put nil "COLUMNS" org-beamer-column-view-format))
	(org-entry-put nil "BEAMER_col_ALL" org-beamer-column-widths))
    (insert "#+LaTeX_CLASS: beamer\n")
    (insert "#+LaTeX_CLASS_OPTIONS: [presentation]\n")
    (when org-beamer-theme (insert "#+BEAMER_THEME: " org-beamer-theme "\n"))
    (when org-beamer-column-view-format
      (insert "#+COLUMNS: " org-beamer-column-view-format "\n"))
    (insert "#+PROPERTY: BEAMER_col_ALL " org-beamer-column-widths "\n")))

;;;###autoload
(defun org-beamer-publish-to-latex (plist filename pub-dir)
  "Publish an Org file to a Beamer presentation (LaTeX).

FILENAME is the filename of the Org file to be published.  PLIST
is the property list for the given project.  PUB-DIR is the
publishing directory.

Return output file name."
  (org-publish-org-to 'beamer filename ".tex" plist pub-dir))

;;;###autoload
(defun org-beamer-publish-to-pdf (plist filename pub-dir)
  "Publish an Org file to a Beamer presentation (PDF, via LaTeX).

FILENAME is the filename of the Org file to be published.  PLIST
is the property list for the given project.  PUB-DIR is the
publishing directory.

Return output file name."
  ;; Unlike to `org-beamer-publish-to-latex', PDF file is generated in
  ;; working directory and then moved to publishing directory.
  (org-publish-attachment
   plist
   (org-latex-compile (org-publish-org-to 'beamer filename ".tex" plist))
   pub-dir))


(provide 'ox-beamer)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; ox-beamer.el ends here

debug log:

solving dc427de ...
found dc427de in https://git.savannah.gnu.org/cgit/emacs/org-mode.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).