lisp/org-footnote.el

   1 ;;; org-footnote.el --- Footnote support in Org and elsewhere
   2 ;;
   3 ;; Copyright (C) 2009-2012 Free Software Foundation, Inc.
   4 ;;
   5 ;; Author: Carsten Dominik <carsten at orgmode dot org>
   6 ;; Keywords: outlines, hypermedia, calendar, wp
   7 ;; Homepage: http://orgmode.org
   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 ;;
  25 ;;; Commentary:
  26
  27 ;; This file contains the code dealing with footnotes in Org-mode.
  28 ;; The code can also be used in arbitrary text modes to provide
  29 ;; footnotes.  Compared to Steven L Baur's footnote.el it provides
  30 ;; better support for resuming editing.  It is less configurable than
  31 ;; Steve's code, though.
  32
  33 ;;; Code:
  34
  35 (eval-when-compile
  36   (require 'cl))
  37 (require 'org-macs)
  38 (require 'org-compat)
  39
  40 (declare-function message-point-in-header-p "message" ())
  41 (declare-function org-back-over-empty-lines "org" ())
  42 (declare-function org-back-to-heading "org" (&optional invisible-ok))
  43 (declare-function org-combine-plists "org" (&rest plists))
  44 (declare-function org-end-of-subtree "org"  (&optional invisible-ok to-heading))
  45 (declare-function org-export-preprocess-string "org-exp"
  46                   (string &rest parameters))
  47 (declare-function org-fill-paragraph "org" (&optional justify))
  48 (declare-function org-icompleting-read "org" (&rest args))
  49 (declare-function org-id-uuid "org-id" ())
  50 (declare-function org-in-block-p "org" (names))
  51 (declare-function org-in-commented-line "org" ())
  52 (declare-function org-in-indented-comment-line "org" ())
  53 (declare-function org-in-regexp "org" (re &optional nlines visually))
  54 (declare-function org-in-verbatim-emphasis "org" ())
  55 (declare-function org-inside-LaTeX-fragment-p "org" ())
  56 (declare-function org-inside-latex-macro-p "org" ())
  57 (declare-function org-mark-ring-push "org" (&optional pos buffer))
  58 (declare-function org-show-context "org" (&optional key))
  59 (declare-function org-trim "org" (s))
  60 (declare-function outline-next-heading "outline")
  61 (declare-function org-skip-whitespace "org" ())
  62
  63 (defvar org-outline-regexp-bol)         ; defined in org.el
  64 (defvar org-odd-levels-only)            ; defined in org.el
  65 (defvar org-bracket-link-regexp)        ; defined in org.el
  66 (defvar message-cite-prefix-regexp)     ; defined in message.el
  67 (defvar message-signature-separator)    ; defined in message.el
  68
  69 (defconst org-footnote-re
  70   ;; Only [1]-like footnotes are closed in this regexp, as footnotes
  71   ;; from other types might contain square brackets (i.e. links) in
  72   ;; their definition.
  73   ;;
  74   ;; `org-re' is used for regexp compatibility with XEmacs.
  75   (concat "\\[\\(?:"
  76           ;; Match inline footnotes.
  77           (org-re "fn:\\([-_[:word:]]+\\)?:\\|")
  78           ;; Match other footnotes.
  79           "\\(?:\\([0-9]+\\)\\]\\)\\|"
  80           (org-re "\\(fn:[-_[:word:]]+\\)")
  81           "\\)")
  82   "Regular expression for matching footnotes.")
  83
  84 (defconst org-footnote-definition-re
  85   (org-re "^\\[\\([0-9]+\\|fn:[-_[:word:]]+\\)\\]")
  86   "Regular expression matching the definition of a footnote.")
  87
  88 (defconst org-footnote-forbidden-blocks
  89   '("ascii" "beamer" "comment" "docbook" "example" "html" "latex" "odt" "src")
  90   "Names of blocks where footnotes are not allowed.")
  91
  92 (defgroup org-footnote nil
  93   "Footnotes in Org-mode."
  94   :tag "Org Footnote"
  95   :group 'org)
  96
  97 (defcustom org-footnote-section "Footnotes"
  98   "Outline heading containing footnote definitions before export.
  99 This can be nil, to place footnotes locally at the end of the current
 100 outline node.  If can also be the name of a special outline heading
 101 under which footnotes should be put.
 102 This variable defines the place where Org puts the definition
 103 automatically, i.e. when creating the footnote, and when sorting the notes.
 104 However, by hand you may place definitions *anywhere*.
 105 If this is a string, during export, all subtrees starting with this
 106 heading will be removed after extracting footnote definitions."
 107   :group 'org-footnote
 108   :type '(choice
 109           (string :tag "Collect footnotes under heading")
 110           (const :tag "Define footnotes locally" nil)))
 111
 112 (defcustom org-footnote-tag-for-non-org-mode-files "Footnotes:"
 113   "Tag marking the beginning of footnote section.
 114 The Org footnote engine can be used in arbitrary text files as well
 115 as in Org-mode.  Outside Org mode, new footnotes are always placed at
 116 the end of the file.  When you normalize the notes, any line containing
 117 only this tag will be removed, a new one will be inserted at the end
 118 of the file, followed by the collected and normalized footnotes.
 119
 120 If you don't want any tag in such buffers, set this variable to nil."
 121   :group 'org-footnote
 122   :type '(choice
 123           (string :tag "Collect footnotes under tag")
 124           (const :tag "Don't use a tag" nil)))
 125
 126 (defcustom org-footnote-define-inline nil
 127   "Non-nil means define footnotes inline, at reference location.
 128 When nil, footnotes will be defined in a special section near
 129 the end of the document.  When t, the [fn:label:definition] notation
 130 will be used to define the footnote at the reference position."
 131   :group 'org-footnote
 132   :type 'boolean)
 133
 134 (defcustom org-footnote-auto-label t
 135   "Non-nil means define automatically new labels for footnotes.
 136 Possible values are:
 137
 138 nil        prompt the user for each label
 139 t          create unique labels of the form [fn:1], [fn:2], ...
 140 confirm    like t, but let the user edit the created value.  In particular,
 141            the label can be removed from the minibuffer, to create
 142            an anonymous footnote.
 143 random     Automatically generate a unique, random label.
 144 plain      Automatically create plain number labels like [1]"
 145   :group 'org-footnote
 146   :type '(choice
 147           (const :tag "Prompt for label" nil)
 148           (const :tag "Create automatic [fn:N]" t)
 149           (const :tag "Offer automatic [fn:N] for editing" confirm)
 150           (const :tag "Create a random label" random)
 151           (const :tag "Create automatic [N]" plain)))
 152
 153 (defcustom org-footnote-auto-adjust nil
 154   "Non-nil means automatically adjust footnotes after insert/delete.
 155 When this is t, after each insertion or deletion of a footnote,
 156 simple fn:N footnotes will be renumbered, and all footnotes will be sorted.
 157 If you want to have just sorting or just renumbering, set this variable
 158 to `sort' or `renumber'.
 159
 160 The main values of this variable can be set with in-buffer options:
 161
 162 #+STARTUP: fnadjust
 163 #+STARTUP: nofnadjust"
 164   :group 'org-footnote
 165   :type '(choice
 166           (const :tag "Renumber" renumber)
 167           (const :tag "Sort" sort)
 168           (const :tag "Renumber and Sort" t)))
 169
 170 (defcustom org-footnote-fill-after-inline-note-extraction nil
 171   "Non-nil means fill paragraphs after extracting footnotes.
 172 When extracting inline footnotes, the lengths of lines can change a lot.
 173 When this option is set, paragraphs from which an inline footnote has been
 174 extracted will be filled again."
 175   :group 'org-footnote
 176   :type 'boolean)
 177
 178 (defun org-footnote-in-valid-context-p ()
 179   "Is point in a context where footnotes are allowed?"
 180   (save-match-data
 181     (not (or (org-in-commented-line)
 182              (org-in-indented-comment-line)
 183              (org-inside-LaTeX-fragment-p)
 184              ;; Avoid protected environments (LaTeX export)
 185              (get-text-property (point) 'org-protected)
 186              ;; Avoid literal example.
 187              (org-in-verbatim-emphasis)
 188              (save-excursion
 189                (beginning-of-line)
 190                (looking-at "[ \t]*:[ \t]+"))
 191              ;; Avoid cited text and headers in message-mode.
 192              (and (derived-mode-p 'message-mode)
 193                   (or (save-excursion
 194                         (beginning-of-line)
 195                         (looking-at message-cite-prefix-regexp))
 196                       (message-point-in-header-p)))
 197              ;; Avoid forbidden blocks.
 198              (org-in-block-p org-footnote-forbidden-blocks)))))
 199
 200 (defun org-footnote-at-reference-p ()
 201   "Is the cursor at a footnote reference?
 202
 203 If so, return a list containing its label, beginning and ending
 204 positions, and the definition, when inlined."
 205   (when (and (org-footnote-in-valid-context-p)
 206              (or (looking-at org-footnote-re)
 207                  (org-in-regexp org-footnote-re)
 208                  (save-excursion (re-search-backward org-footnote-re nil t)))
 209              (/= (match-beginning 0) (point-at-bol)))
 210     (let* ((beg (match-beginning 0))
 211            (label (or (org-match-string-no-properties 2)
 212                       (org-match-string-no-properties 3)
 213                       ;; Anonymous footnotes don't have labels
 214                       (and (match-string 1)
 215                            (concat "fn:" (org-match-string-no-properties 1)))))
 216            ;; Inline footnotes don't end at (match-end 0) as
 217            ;; `org-footnote-re' stops just after the second colon.
 218            ;; Find the real ending with `scan-sexps', so Org doesn't
 219            ;; get fooled by unrelated closing square brackets.
 220            (end (ignore-errors (scan-sexps beg 1))))
 221       ;; Point is really at a reference if it's located before true
 222       ;; ending of the footnote.
 223       (when (and end (< (point) end)
 224                  ;; Verify match isn't a part of a link.
 225                  (not (save-excursion
 226                         (goto-char beg)
 227                         (let ((linkp
 228                                (save-match-data
 229                                  (org-in-regexp org-bracket-link-regexp))))
 230                           (and linkp (< (point) (cdr linkp))))))
 231                  ;; Verify point doesn't belong to a LaTeX macro.
 232                  ;; Beware though, when two footnotes are side by
 233                  ;; side, once the first one is changed into LaTeX,
 234                  ;; the second one might then be considered as an
 235                  ;; optional argument of the command.  Thus, check
 236                  ;; the `org-protected' property of that command.
 237                  (or (not (org-inside-latex-macro-p))
 238                      (get-text-property (1- beg) 'org-protected)))
 239         (list label beg end
 240               ;; Definition: ensure this is an inline footnote first.
 241               (and (or (not label) (match-string 1))
 242                    (org-trim (buffer-substring-no-properties
 243                               (match-end 0) (1- end)))))))))
 244
 245 (defun org-footnote-at-definition-p ()
 246   "Is point within a footnote definition?
 247
 248 This matches only pure definitions like [1] or [fn:name] at the
 249 beginning of a line.  It does not match references like
 250 \[fn:name:definition], where the footnote text is included and
 251 defined locally.
 252
 253 The return value will be nil if not at a footnote definition, and
 254 a list with label, start, end and definition of the footnote
 255 otherwise."
 256   (when (save-excursion (beginning-of-line) (org-footnote-in-valid-context-p))
 257     (save-excursion
 258       (end-of-line)
 259       ;; Footnotes definitions are separated by new headlines or blank
 260       ;; lines.
 261       (let ((lim (save-excursion (re-search-backward
 262                                   (concat org-outline-regexp-bol
 263                                           "\\|^[ \t]*$") nil t))))
 264         (when (re-search-backward org-footnote-definition-re lim t)
 265           (let ((label (org-match-string-no-properties 1))
 266                 (beg (match-beginning 0))
 267                 (beg-def (match-end 0))
 268                 ;; In message-mode, do not search after signature.
 269                 (end (let ((bound (and (derived-mode-p 'message-mode)
 270                                        (save-excursion
 271                                          (goto-char (point-max))
 272                                          (re-search-backward
 273                                           message-signature-separator nil t)))))
 274                        (if (progn
 275                              (end-of-line)
 276                              (re-search-forward
 277                               (concat org-outline-regexp-bol "\\|"
 278                                       org-footnote-definition-re "\\|"
 279                                       "^[ \t]*$") bound 'move))
 280                            (progn (goto-char (match-beginning 0))
 281                                   (org-skip-whitespace)
 282                                   (point-at-bol))
 283                          (point)))))
 284             (list label beg end
 285                   (org-trim (buffer-substring-no-properties beg-def end)))))))))
 286
 287 (defun org-footnote-get-next-reference (&optional label backward limit)
 288   "Return complete reference of the next footnote.
 289
 290 If LABEL is provided, get the next reference of that footnote.  If
 291 BACKWARD is non-nil, find previous reference instead.  LIMIT is
 292 the buffer position bounding the search.
 293
 294 Return value is a list like those provided by `org-footnote-at-reference-p'.
 295 If no footnote is found, return nil."
 296   (save-excursion
 297     (let* ((label-fmt (if label (format "\\[%s[]:]" label) org-footnote-re)))
 298       (catch 'exit
 299         (while t
 300           (unless (funcall (if backward #'re-search-backward #'re-search-forward)
 301                            label-fmt limit t)
 302             (throw 'exit nil))
 303           (unless backward (backward-char))
 304           (let ((ref (org-footnote-at-reference-p)))
 305             (when ref (throw 'exit ref))))))))
 306
 307 (defun org-footnote-next-reference-or-definition (limit)
 308   "Move point to next footnote reference or definition.
 309
 310 LIMIT is the buffer position bounding the search.
 311
 312 Return value is a list like those provided by
 313 `org-footnote-at-reference-p' or `org-footnote-at-definition-p'.
 314 If no footnote is found, return nil."
 315   (let* (ref (origin (point)))
 316     (catch 'exit
 317       (while t
 318         (unless (re-search-forward org-footnote-re limit t)
 319           (goto-char origin)
 320           (throw 'exit nil))
 321         ;; Beware: with [1]-like footnotes point will be just after
 322         ;; the closing square bracket.
 323         (backward-char)
 324         (cond
 325          ((setq ref (org-footnote-at-reference-p))
 326           (throw 'exit ref))
 327          ;; Definition: also grab the last square bracket, only
 328          ;; matched in `org-footnote-re' for [1]-like footnotes.
 329          ((save-match-data (org-footnote-at-definition-p))
 330           (let ((end (match-end 0)))
 331             (throw 'exit
 332                    (list nil (match-beginning 0)
 333                          (if (eq (char-before end) 93) end (1+ end)))))))))))
 334
 335 (defun org-footnote-get-definition (label)
 336   "Return label, boundaries and definition of the footnote LABEL."
 337   (let* ((label (regexp-quote (org-footnote-normalize-label label)))
 338          (re (format "^\\[%s\\]\\|.\\[%s:" label label))
 339          pos)
 340     (save-excursion
 341       (save-restriction
 342         (when (or (re-search-forward re nil t)
 343                   (and (goto-char (point-min))
 344                        (re-search-forward re nil t))
 345                   (and (progn (widen) t)
 346                        (goto-char (point-min))
 347                        (re-search-forward re nil t)))
 348           (let ((refp (org-footnote-at-reference-p)))
 349             (cond
 350              ((and (nth 3 refp) refp))
 351              ((org-footnote-at-definition-p)))))))))
 352
 353 (defun org-footnote-goto-definition (label)
 354   "Move point to the definition of the footnote LABEL.
 355 Return a non-nil value when a definition has been found."
 356   (interactive "sLabel: ")
 357   (org-mark-ring-push)
 358   (let ((def (org-footnote-get-definition label)))
 359     (if (not def)
 360         (error "Cannot find definition of footnote %s" label)
 361       (goto-char (nth 1 def))
 362       (looking-at (format "\\[%s\\]\\|\\[%s:" label label))
 363       (goto-char (match-end 0))
 364       (org-show-context 'link-search)
 365       (when (eq major-mode 'org-mode)
 366         (message "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'."))
 367       t)))
 368
 369 (defun org-footnote-goto-previous-reference (label)
 370   "Find the first closest (to point) reference of footnote with label LABEL."
 371   (interactive "sLabel: ")
 372   (org-mark-ring-push)
 373   (let* ((label (org-footnote-normalize-label label)) ref)
 374     (save-excursion
 375       (setq ref (or (org-footnote-get-next-reference label t)
 376                     (org-footnote-get-next-reference label)
 377                     (save-restriction
 378                       (widen)
 379                       (or
 380                        (org-footnote-get-next-reference label t)
 381                        (org-footnote-get-next-reference label))))))
 382     (if (not ref)
 383         (error "Cannot find reference of footnote %s" label)
 384       (goto-char (nth 1 ref))
 385       (org-show-context 'link-search))))
 386
 387 (defun org-footnote-normalize-label (label)
 388   "Return LABEL as an appropriate string."
 389   (cond
 390    ((numberp label) (number-to-string label))
 391    ((equal "" label) nil)
 392    ((not (string-match "^[0-9]+$\\|^fn:" label))
 393     (concat "fn:" label))
 394    (t label)))
 395
 396 (defun org-footnote-all-labels (&optional with-defs)
 397   "Return list with all defined foot labels used in the buffer.
 398
 399 If WITH-DEFS is non-nil, also associate the definition to each
 400 label.  The function will then return an alist whose key is label
 401 and value definition."
 402   (let* (rtn
 403          (push-to-rtn
 404           (function
 405            ;; Depending on WITH-DEFS, store label or (label . def) of
 406            ;; footnote reference/definition given as argument in RTN.
 407            (lambda (el)
 408              (let ((lbl (car el)))
 409                (push (if with-defs (cons lbl (nth 3 el)) lbl) rtn))))))
 410     (save-excursion
 411       (save-restriction
 412         (widen)
 413         ;; Find all labels found in definitions.
 414         (goto-char (point-min))
 415         (let (def)
 416           (while (re-search-forward org-footnote-definition-re nil t)
 417             (when (setq def (org-footnote-at-definition-p))
 418               (funcall push-to-rtn def))))
 419         ;; Find all labels found in references.
 420         (goto-char (point-min))
 421         (let (ref)
 422           (while (setq ref (org-footnote-get-next-reference))
 423             (goto-char (nth 2 ref))
 424             (and (car ref)              ; ignore anonymous footnotes
 425                  (not (funcall (if with-defs #'assoc #'member) (car ref) rtn))
 426                  (funcall push-to-rtn ref))))))
 427     rtn))
 428
 429 (defun org-footnote-unique-label (&optional current)
 430   "Return a new unique footnote label.
 431
 432 The function returns the first \"fn:N\" or \"N\" label that is
 433 currently not used.
 434
 435 Optional argument CURRENT is the list of labels active in the
 436 buffer."
 437   (unless current (setq current (org-footnote-all-labels)))
 438   (let ((fmt (if (eq org-footnote-auto-label 'plain) "%d" "fn:%d"))
 439         (cnt 1))
 440     (while (member (format fmt cnt) current)
 441       (incf cnt))
 442     (format fmt cnt)))
 443
 444 (defun org-footnote-new ()
 445   "Insert a new footnote.
 446 This command prompts for a label.  If this is a label referencing an
 447 existing label, only insert the label.  If the footnote label is empty
 448 or new, let the user edit the definition of the footnote."
 449   (interactive)
 450   (unless (org-footnote-in-valid-context-p)
 451     (error "Cannot insert a footnote here"))
 452   (let* ((lbls (and (not (equal org-footnote-auto-label 'random))
 453                     (org-footnote-all-labels)))
 454          (propose (org-footnote-unique-label lbls))
 455          (label
 456           (org-footnote-normalize-label
 457            (cond
 458             ((member org-footnote-auto-label '(t plain))
 459              propose)
 460             ((equal org-footnote-auto-label 'random)
 461              (require 'org-id)
 462              (substring (org-id-uuid) 0 8))
 463             (t
 464              (org-icompleting-read
 465               "Label (leave empty for anonymous): "
 466               (mapcar 'list lbls) nil nil
 467               (if (eq org-footnote-auto-label 'confirm) propose nil)))))))
 468     (cond
 469      ((bolp) (error "Cannot create a footnote reference at left margin"))
 470      ((not label)
 471       (insert "[fn:: ]")
 472       (backward-char 1))
 473      ((member label lbls)
 474       (insert "[" label "]")
 475       (message "New reference to existing note"))
 476      (org-footnote-define-inline
 477       (insert "[" label ": ]")
 478       (backward-char 1)
 479       (org-footnote-auto-adjust-maybe))
 480      (t
 481       (insert "[" label "]")
 482       (org-footnote-create-definition label)
 483       (org-footnote-auto-adjust-maybe)))))
 484
 485 (defvar org-blank-before-new-entry) ; silence byte-compiler
 486 (defun org-footnote-create-definition (label)
 487   "Start the definition of a footnote with label LABEL."
 488   (interactive "sLabel: ")
 489   (let ((label (org-footnote-normalize-label label)))
 490     (cond
 491      ;; In an Org file.
 492      ((eq major-mode 'org-mode)
 493       ;; If `org-footnote-section' is defined, find it, or create it
 494       ;; at the end of the buffer.
 495       (when org-footnote-section
 496         (goto-char (point-min))
 497         (let ((re (concat "^\\*+[ \t]+" org-footnote-section "[ \t]*$")))
 498           (unless (or (re-search-forward re nil t)
 499                       (and (progn (widen) t)
 500                            (re-search-forward re nil t)))
 501             (goto-char (point-max))
 502             (skip-chars-backward " \t\r\n")
 503             (unless (bolp) (newline))
 504             ;; Insert new section.  Separate it from the previous one
 505             ;; with a blank line, unless `org-blank-before-new-entry'
 506             ;; explicitly says no.
 507             (when (and (cdr (assq 'heading org-blank-before-new-entry))
 508                        (zerop (save-excursion (org-back-over-empty-lines))))
 509               (insert "\n"))
 510             (insert "* " org-footnote-section "\n"))))
 511       ;; Move to the end of this entry (which may be
 512       ;; `org-footnote-section' or the current one).
 513       (org-footnote-goto-local-insertion-point)
 514       (org-show-context 'link-search))
 515      (t
 516       ;; In a non-Org file.  Search for footnote tag, or create it if
 517       ;; specified (at the end of buffer, or before signature if in
 518       ;; Message mode).  Set point after any definition already there.
 519       (let ((tag (and org-footnote-tag-for-non-org-mode-files
 520                       (concat "^" (regexp-quote
 521                                    org-footnote-tag-for-non-org-mode-files)
 522                               "[ \t]*$")))
 523             (max (if (and (derived-mode-p 'message-mode)
 524                           (goto-char (point-max))
 525                           (re-search-backward
 526                            message-signature-separator nil t))
 527                      (progn
 528                        ;; Ensure one blank line separates last
 529                        ;; footnote from signature.
 530                        (beginning-of-line)
 531                        (open-line 2)
 532                        (point-marker))
 533                    (point-max-marker))))
 534         (set-marker-insertion-type max t)
 535         (goto-char max)
 536         ;; Check if the footnote tag is defined but missing.  In this
 537         ;; case, insert it, before any footnote or one blank line
 538         ;; after any previous text.
 539         (when (and tag (not (re-search-backward tag nil t)))
 540           (skip-chars-backward " \t\r\n")
 541           (while (re-search-backward org-footnote-definition-re nil t))
 542           (unless (bolp) (newline 2))
 543           (insert org-footnote-tag-for-non-org-mode-files "\n\n"))
 544         ;; Remove superfluous white space and clear marker.
 545         (goto-char max)
 546         (skip-chars-backward " \t\r\n")
 547         (delete-region (point) max)
 548         (unless (bolp) (newline))
 549         (set-marker max nil))))
 550     ;; Insert footnote label.
 551     (when (zerop (org-back-over-empty-lines)) (newline))
 552     (insert "[" label "] \n")
 553     (backward-char)
 554     ;; Only notify user about next possible action when in an Org
 555     ;; buffer, as the bindings may have different meanings otherwise.
 556     (when (eq major-mode 'org-mode)
 557       (message
 558        "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'."))))
 559
 560 ;;;###autoload
 561 (defun org-footnote-action (&optional special)
 562   "Do the right thing for footnotes.
 563
 564 When at a footnote reference, jump to the definition.
 565
 566 When at a definition, jump to the references if they exist, offer
 567 to create them otherwise.
 568
 569 When neither at definition or reference, create a new footnote,
 570 interactively.
 571
 572 With prefix arg SPECIAL, offer additional commands in a menu."
 573   (interactive "P")
 574   (let (tmp c)
 575     (cond
 576      (special
 577       (message "Footnotes: [s]ort  |  [r]enumber fn:N  |  [S]=r+s |->[n]umeric  |  [d]elete")
 578       (setq c (read-char-exclusive))
 579       (cond
 580        ((eq c ?s) (org-footnote-normalize 'sort))
 581        ((eq c ?r) (org-footnote-renumber-fn:N))
 582        ((eq c ?S)
 583         (org-footnote-renumber-fn:N)
 584         (org-footnote-normalize 'sort))
 585        ((eq c ?n) (org-footnote-normalize))
 586        ((eq c ?d) (org-footnote-delete))
 587        (t (error "No such footnote command %c" c))))
 588      ((setq tmp (org-footnote-at-reference-p))
 589       (cond
 590        ;; Anonymous footnote: move point at the beginning of its
 591        ;; definition.
 592        ((not (car tmp))
 593         (goto-char (nth 1 tmp))
 594         (forward-char 5))
 595        ;; A definition exists: move to it.
 596        ((ignore-errors (org-footnote-goto-definition (car tmp))))
 597        ;; No definition exists: offer to create it.
 598        ((yes-or-no-p (format "No definition for %s.  Create one? " (car tmp)))
 599         (org-footnote-create-definition (car tmp)))))
 600      ((setq tmp (org-footnote-at-definition-p))
 601       (org-footnote-goto-previous-reference (car tmp)))
 602      (t (org-footnote-new)))))
 603
 604 (defvar org-footnote-insert-pos-for-preprocessor 'point-max
 605   "See `org-footnote-normalize'.")
 606
 607 (defvar org-export-footnotes-seen) ; silence byte-compiler
 608 (defvar org-export-footnotes-data) ; silence byte-compiler
 609
 610 ;;;###autoload
 611 (defun org-footnote-normalize (&optional sort-only export-props)
 612   "Collect the footnotes in various formats and normalize them.
 613
 614 This finds the different sorts of footnotes allowed in Org, and
 615 normalizes them to the usual [N] format that is understood by the
 616 Org-mode exporters.
 617
 618 When SORT-ONLY is set, only sort the footnote definitions into the
 619 referenced sequence.
 620
 621 If Org is amidst an export process, EXPORT-PROPS will hold the
 622 export properties of the buffer.
 623
 624 When EXPORT-PROPS is non-nil, the default action is to insert
 625 normalized footnotes towards the end of the pre-processing
 626 buffer.  Some exporters (docbook, odt...) expect footnote
 627 definitions to be available before any references to them.  Such
 628 exporters can let bind `org-footnote-insert-pos-for-preprocessor'
 629 to symbol `point-min' to achieve the desired behaviour.
 630
 631 Additional note on `org-footnote-insert-pos-for-preprocessor':
 632 1. This variable has not effect when FOR-PREPROCESSOR is nil.
 633 2. This variable (potentially) obviates the need for extra scan
 634    of pre-processor buffer as witnessed in
 635    `org-export-docbook-get-footnotes'."
 636   ;; This is based on Paul's function, but rewritten.
 637   ;;
 638   ;; Re-create `org-with-limited-levels', but not limited to Org
 639   ;; buffers.
 640   (let* ((limit-level
 641           (and (boundp 'org-inlinetask-min-level)
 642                org-inlinetask-min-level
 643                (1- org-inlinetask-min-level)))
 644          (nstars (and limit-level
 645                       (if org-odd-levels-only
 646                           (and limit-level (1- (* limit-level 2)))
 647                         limit-level)))
 648          (org-outline-regexp
 649           (concat "\\*" (if nstars (format "\\{1,%d\\} " nstars) "+ ")))
 650          ;; Determine the highest marker used so far.
 651          (ref-table (when export-props org-export-footnotes-seen))
 652          (count (if (and export-props ref-table)
 653                     (apply 'max (mapcar (lambda (e) (nth 1 e)) ref-table))
 654                   0))
 655          ins-point ref)
 656     (save-excursion
 657       ;; 1. Find every footnote reference, extract the definition, and
 658       ;;    collect that data in REF-TABLE.  If SORT-ONLY is nil, also
 659       ;;    normalize references.
 660       (goto-char (point-min))
 661       (while (setq ref (org-footnote-get-next-reference))
 662         (let* ((lbl (car ref))
 663                (pos (nth 1 ref))
 664                ;; When footnote isn't anonymous, check if it's label
 665                ;; (REF) is already stored in REF-TABLE.  In that case,
 666                ;; extract number used to identify it (MARKER).  If
 667                ;; footnote is unknown, increment the global counter
 668                ;; (COUNT) to create an unused identifier.
 669                (a (and lbl (assoc lbl ref-table)))
 670                (marker (or (nth 1 a) (incf count)))
 671                ;; Is the reference inline or pointing to an inline
 672                ;; footnote?
 673                (inlinep (or (stringp (nth 3 ref)) (nth 3 a))))
 674           ;; Replace footnote reference with [MARKER].  Maybe fill
 675           ;; paragraph once done.  If SORT-ONLY is non-nil, only move
 676           ;; to the end of reference found to avoid matching it twice.
 677           ;; If EXPORT-PROPS isn't nil, also add `org-footnote'
 678           ;; property to it, so it can be easily recognized by
 679           ;; exporters.
 680           (if sort-only (goto-char (nth 2 ref))
 681             (delete-region (nth 1 ref) (nth 2 ref))
 682             (goto-char (nth 1 ref))
 683             (let ((new-ref (format "[%d]" marker)))
 684               (when export-props (org-add-props new-ref '(org-footnote t)))
 685               (insert new-ref))
 686             (and inlinep
 687                  org-footnote-fill-after-inline-note-extraction
 688                  (org-fill-paragraph)))
 689           ;; Add label (REF), identifier (MARKER), definition (DEF)
 690           ;; type (INLINEP) and position (POS) to REF-TABLE if data
 691           ;; was unknown.
 692           (unless a
 693             (let ((def (or (nth 3 ref)  ; inline
 694                            (and export-props
 695                                 (cdr (assoc lbl org-export-footnotes-data)))
 696                            (nth 3 (org-footnote-get-definition lbl)))))
 697               (push (list lbl marker
 698                           ;; When exporting, each definition goes
 699                           ;; through `org-export-preprocess-string' so
 700                           ;; it is ready to insert in the
 701                           ;; backend-specific buffer.
 702                           (if (and export-props def)
 703                               (let ((parameters
 704                                      (org-combine-plists
 705                                       export-props
 706                                       '(:todo-keywords t :tags t :priority t))))
 707                                 (org-export-preprocess-string def parameters))
 708                             def)
 709                           ;; Reference beginning position is a marker
 710                           ;; to preserve it during further buffer
 711                           ;; modifications.
 712                           inlinep (copy-marker pos)) ref-table)))))
 713       ;; 2. Find and remove the footnote section, if any.  Also
 714       ;;    determine where footnotes shall be inserted (INS-POINT).
 715       (cond
 716        ((and org-footnote-section (eq major-mode 'org-mode))
 717         (goto-char (point-min))
 718         (if (re-search-forward
 719               (concat "^\\*[ \t]+" (regexp-quote org-footnote-section)
 720                       "[ \t]*$") nil t)
 721             (delete-region (match-beginning 0) (org-end-of-subtree t t)))
 722         ;; A new footnote section is inserted by default at the end of
 723         ;; the buffer.
 724         (goto-char (point-max))
 725         (skip-chars-backward " \r\t\n")
 726         (forward-line)
 727         (unless (bolp) (newline)))
 728        ;; No footnote section set: Footnotes will be added at the end
 729        ;; of the section containing their first reference.
 730        ((eq major-mode 'org-mode))
 731        (t
 732         ;; Remove any left-over tag in the buffer, if one is set up.
 733         (when org-footnote-tag-for-non-org-mode-files
 734           (let ((tag (concat "^" (regexp-quote
 735                                   org-footnote-tag-for-non-org-mode-files)
 736                              "[ \t]*$")))
 737             (goto-char (point-min))
 738             (while (re-search-forward tag nil t)
 739               (replace-match "")
 740               (delete-region (point) (progn (forward-line) (point))))))
 741         ;; In Message mode, ensure footnotes are inserted before the
 742         ;; signature.
 743         (if (and (derived-mode-p 'message-mode)
 744                  (goto-char (point-max))
 745                  (re-search-backward message-signature-separator nil t))
 746             (beginning-of-line)
 747           (goto-char (point-max)))))
 748       ;; During export, `org-footnote-insert-pos-for-preprocessor' has
 749       ;; precedence over previously found position.
 750       (setq ins-point
 751             (copy-marker
 752              (if (and export-props
 753                       (eq org-footnote-insert-pos-for-preprocessor 'point-min))
 754                  (point-min)
 755                (point))))
 756       ;; 3. Clean-up REF-TABLE.
 757       (setq ref-table
 758             (delq nil
 759                   (mapcar
 760                    (lambda (x)
 761                      (cond
 762                       ;; When only sorting, ignore inline footnotes.
 763                       ;; Also clear position marker.
 764                       ((and sort-only (nth 3 x))
 765                        (set-marker (nth 4 x) nil) nil)
 766                       ;; No definition available: provide one.
 767                       ((not (nth 2 x))
 768                        (append
 769                         (list (car x) (nth 1 x)
 770                               (format "DEFINITION NOT FOUND: %s" (car x)))
 771                         (nthcdr 3 x)))
 772                       (t x)))
 773                    ref-table)))
 774       (setq ref-table (nreverse ref-table))
 775       ;; 4. Remove left-over definitions in the buffer.
 776       (mapc (lambda (x)
 777               (unless (nth 3 x) (org-footnote-delete-definitions (car x))))
 778             ref-table)
 779       ;; 5. Insert the footnotes again in the buffer, at the
 780       ;;    appropriate spot.
 781       (goto-char ins-point)
 782       (cond
 783        ;; No footnote: exit.
 784        ((not ref-table))
 785        ;; Cases when footnotes should be inserted in one place.
 786        ((or (not (eq major-mode 'org-mode))
 787             org-footnote-section
 788             export-props)
 789         ;; Insert again the section title, if any.  Ensure that title,
 790         ;; or the subsequent footnotes, will be separated by a blank
 791         ;; lines from the rest of the document.  In an Org buffer,
 792         ;; separate section with a blank line, unless explicitly
 793         ;; stated in `org-blank-before-new-entry'.
 794         (cond
 795          ((not (eq major-mode 'org-mode))
 796           (skip-chars-backward " \t\n\r")
 797           (delete-region (point) ins-point)
 798           (unless (bolp) (newline))
 799           (when org-footnote-tag-for-non-org-mode-files
 800             (insert "\n" org-footnote-tag-for-non-org-mode-files "\n")))
 801          ((and org-footnote-section (not export-props))
 802           (when (and (cdr (assq 'heading org-blank-before-new-entry))
 803                      (zerop (save-excursion (org-back-over-empty-lines))))
 804             (insert "\n"))
 805           (insert "* " org-footnote-section "\n")))
 806         (set-marker ins-point nil)
 807         ;; Insert the footnotes, separated by a blank line.
 808         (insert
 809          (mapconcat
 810           (lambda (x)
 811             ;; Clean markers.
 812             (set-marker (nth 4 x) nil)
 813             (format "\n[%s] %s" (nth (if sort-only 0 1) x) (nth 2 x)))
 814           ref-table "\n"))
 815         (unless (eobp) (insert "\n\n"))
 816         ;; When exporting, add newly inserted markers along with their
 817         ;; associated definition to `org-export-footnotes-seen'.
 818         (when export-props (setq org-export-footnotes-seen ref-table)))
 819        ;; Each footnote definition has to be inserted at the end of
 820        ;; the section where its first reference belongs.
 821        (t
 822         (mapc
 823          (lambda (x)
 824            (let ((pos (nth 4 x)))
 825              (goto-char pos)
 826              ;; Clean marker.
 827              (set-marker pos nil))
 828            (org-footnote-goto-local-insertion-point)
 829            (insert (format "\n[%s] %s\n"
 830                            (if sort-only (car x) (nth 1 x))
 831                            (nth 2 x))))
 832          ref-table))))))
 833
 834 (defun org-footnote-goto-local-insertion-point ()
 835   "Find insertion point for footnote, just before next outline heading."
 836   (org-with-limited-levels (outline-next-heading))
 837   (or (bolp) (newline))
 838   (beginning-of-line 0)
 839   (while (and (not (bobp)) (= (char-after) ?#))
 840     (beginning-of-line 0))
 841   (if (looking-at "[ \t]*#\\+TBLFM:") (beginning-of-line 2))
 842   (end-of-line 1)
 843   (skip-chars-backward "\n\r\t ")
 844   (forward-line))
 845
 846 (defun org-footnote-delete-references (label)
 847   "Delete every reference to footnote LABEL.
 848 Return the number of footnotes removed."
 849   (save-excursion
 850     (goto-char (point-min))
 851     (let (ref (nref 0))
 852       (while (setq ref (org-footnote-get-next-reference label))
 853         (goto-char (nth 1 ref))
 854         (delete-region (nth 1 ref) (nth 2 ref))
 855         (incf nref))
 856       nref)))
 857
 858 (defun org-footnote-delete-definitions (label)
 859   "Delete every definition of the footnote LABEL.
 860 Return the number of footnotes removed."
 861   (save-excursion
 862     (goto-char (point-min))
 863     (let ((def-re (concat "^\\[" (regexp-quote label) "\\]"))
 864           (ndef 0))
 865       (while (re-search-forward def-re nil t)
 866         (let ((full-def (org-footnote-at-definition-p)))
 867           (when full-def
 868             (delete-region (nth 1 full-def) (nth 2 full-def))
 869             (incf ndef))))
 870       ndef)))
 871
 872 (defun org-footnote-delete (&optional label)
 873   "Delete the footnote at point.
 874 This will remove the definition (even multiple definitions if they exist)
 875 and all references of a footnote label.
 876
 877 If LABEL is non-nil, delete that footnote instead."
 878   (catch 'done
 879     (let* ((nref 0) (ndef 0) x
 880            ;; 1. Determine LABEL of footnote at point.
 881            (label (cond
 882                    ;; LABEL is provided as argument.
 883                    (label)
 884                    ;; Footnote reference at point. If the footnote is
 885                    ;; anonymous, delete it and exit instead.
 886                    ((setq x (org-footnote-at-reference-p))
 887                     (or (car x)
 888                         (progn
 889                           (delete-region (nth 1 x) (nth 2 x))
 890                           (message "Anonymous footnote removed")
 891                           (throw 'done t))))
 892                    ;; Footnote definition at point.
 893                    ((setq x (org-footnote-at-definition-p))
 894                     (car x))
 895                    (t (error "Don't know which footnote to remove")))))
 896       ;; 2. Now that LABEL is non-nil, find every reference and every
 897       ;; definition, and delete them.
 898       (setq nref (org-footnote-delete-references label)
 899             ndef (org-footnote-delete-definitions label))
 900       ;; 3. Verify consistency of footnotes and notify user.
 901       (org-footnote-auto-adjust-maybe)
 902       (message "%d definition(s) of and %d reference(s) of footnote %s removed"
 903                ndef nref label))))
 904
 905 (defun org-footnote-renumber-fn:N ()
 906   "Renumber the simple footnotes like fn:17 into a sequence in the document."
 907   (interactive)
 908   (let (map (n 0))
 909     (org-with-wide-buffer
 910      (goto-char (point-min))
 911      (while (re-search-forward "\\[fn:\\([0-9]+\\)[]:]" nil t)
 912        (save-excursion
 913          (goto-char (match-beginning 0))
 914          ;; Ensure match is a footnote reference or definition.
 915          (when (save-match-data (if (bolp)
 916                                     (org-footnote-at-definition-p)
 917                                   (org-footnote-at-reference-p)))
 918            (let ((new-val (or (cdr (assoc (match-string 1) map))
 919                               (number-to-string (incf n)))))
 920              (unless (assoc (match-string 1) map)
 921                (push (cons (match-string 1) new-val) map))
 922              (replace-match new-val nil nil nil 1))))))))
 923
 924 (defun org-footnote-auto-adjust-maybe ()
 925   "Renumber and/or sort footnotes according to user settings."
 926   (when (memq org-footnote-auto-adjust '(t renumber))
 927     (org-footnote-renumber-fn:N))
 928   (when (memq org-footnote-auto-adjust '(t sort))
 929     (let ((label (car (org-footnote-at-definition-p))))
 930       (org-footnote-normalize 'sort)
 931       (when label
 932         (goto-char (point-min))
 933         (and (re-search-forward (concat "^\\[" (regexp-quote label) "\\]")
 934                                 nil t)
 935              (progn (insert " ")
 936                     (just-one-space)))))))
 937
 938 (provide 'org-footnote)
 939
 940 ;;; org-footnote.el ends here