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+;;; org-footnote.el --- Footnote support in Org and elsewhere
+;;
+;; Copyright (C) 2009, 2010 Free Software Foundation, Inc.
+;;
+;; Author: Carsten Dominik <carsten at orgmode dot org>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: http://orgmode.org
+;; Version: 7.4
+;;
+;; This file is part of GNU Emacs.
+;;
+;; 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 file contains the code dealing with footnotes in Org-mode.
+;; The code can also be used in arbitrary text modes to provide
+;; footnotes. Compared to Steven L Baur's footnote.el it provides
+;; better support for resuming editing. It is less configurable than
+;; Steve's code, though.
+
+;;; Code:
+
+(eval-when-compile
+ (require 'cl))
+(require 'org-macs)
+(require 'org-compat)
+
+(declare-function org-in-commented-line "org" ())
+(declare-function org-in-regexp "org" (re &optional nlines visually))
+(declare-function org-mark-ring-push "org" (&optional pos buffer))
+(declare-function outline-next-heading "outline")
+(declare-function org-trim "org" (s))
+(declare-function org-show-context "org" (&optional key))
+(declare-function org-back-to-heading "org" (&optional invisible-ok))
+(declare-function org-end-of-subtree "org" (&optional invisible-ok to-heading))
+(declare-function org-in-verbatim-emphasis "org" ())
+(declare-function org-inside-latex-macro-p "org" ())
+(defvar org-odd-levels-only) ;; defined in org.el
+(defvar message-signature-separator) ;; defined in message.el
+
+(defconst org-footnote-re
+ (concat "[^][\n]" ; to make sure it is not at the beginning of a line
+ "\\["
+ "\\(?:"
+ "\\([0-9]+\\)"
+ "\\|"
+ (org-re "\\(fn:\\([-_[:word:]]+?\\)?\\)\\(?::\\([^\]]*?\\)\\)?")
+ "\\)"
+ "\\]")
+ "Regular expression for matching footnotes.")
+
+(defconst org-footnote-definition-re
+ (org-re "^\\(\\[\\([0-9]+\\|fn:[-_[:word:]]+\\)\\]\\)")
+ "Regular expression matching the definition of a footnote.")
+
+(defgroup org-footnote nil
+ "Footnotes in Org-mode."
+ :tag "Org Footnote"
+ :group 'org)
+
+(defcustom org-footnote-section "Footnotes"
+ "Outline heading containing footnote definitions before export.
+This can be nil, to place footnotes locally at the end of the current
+outline node. If can also be the name of a special outline heading
+under which footnotes should be put.
+This variable defines the place where Org puts the definition
+automatically, i.e. when creating the footnote, and when sorting the notes.
+However, by hand you may place definitions *anywhere*.
+If this is a string, during export, all subtrees starting with this
+heading will be removed after extracting footnote definitions."
+ :group 'org-footnote
+ :type '(choice
+ (string :tag "Collect footnotes under heading")
+ (const :tag "Define footnotes locally" nil)))
+
+(defcustom org-footnote-tag-for-non-org-mode-files "Footnotes:"
+ "Tag marking the beginning of footnote section.
+The Org-mode footnote engine can be used in arbitrary text files as well
+as in Org-mode. Outside Org-mode, new footnotes are always placed at
+the end of the file. When you normalize the notes, any line containing
+only this tag will be removed, a new one will be inserted at the end
+of the file, followed by the collected and normalized footnotes."
+ :group 'org-footnote
+ :type 'string)
+
+(defcustom org-footnote-define-inline nil
+ "Non-nil means define footnotes inline, at reference location.
+When nil, footnotes will be defined in a special section near
+the end of the document. When t, the [fn:label:definition] notation
+will be used to define the footnote at the reference position."
+ :group 'org-footnote
+ :type 'boolean)
+
+(defcustom org-footnote-auto-label t
+ "Non-nil means define automatically new labels for footnotes.
+Possible values are:
+
+nil prompt the user for each label
+t create unique labels of the form [fn:1], [fn:2], ...
+confirm like t, but let the user edit the created value. In particular,
+ the label can be removed from the minibuffer, to create
+ an anonymous footnote.
+plain Automatically create plain number labels like [1]"
+ :group 'org-footnote
+ :type '(choice
+ (const :tag "Prompt for label" nil)
+ (const :tag "Create automatic [fn:N]" t)
+ (const :tag "Offer automatic [fn:N] for editing" confirm)
+ (const :tag "Create automatic [N]" plain)))
+
+(defcustom org-footnote-auto-adjust nil
+ "Non-nil means automatically adjust footnotes after insert/delete.
+When this is t, after each insertion or deletion of a footnote,
+simple fn:N footnotes will be renumbered, and all footnotes will be sorted.
+If you want to have just sorting or just renumbering, set this variable
+to `sort' or `renumber'.
+
+The main values of this variable can be set with in-buffer options:
+
+#+STARTUP: fnadjust
+#+STARTUP: nofnadjust"
+ :group 'org-footnote
+ :type '(choice
+ (const :tag "Renumber" renumber)
+ (const :tag "Sort" sort)
+ (const :tag "Renumber and Sort" t)))
+
+(defcustom org-footnote-fill-after-inline-note-extraction nil
+ "Non-nil means fill paragraphs after extracting footnotes.
+When extracting inline footnotes, the lengths of lines can change a lot.
+When this option is set, paragraphs from which an inline footnote has been
+extracted will be filled again."
+ :group 'org-footnote
+ :type 'boolean)
+
+(defun org-footnote-at-reference-p ()
+ "Is the cursor at a footnote reference?
+If yes, return the beginning position, the label, and the definition, if local."
+ (when (org-in-regexp org-footnote-re 15)
+ (list (match-beginning 0)
+ (or (match-string 1)
+ (if (equal (match-string 2) "fn:") nil (match-string 2)))
+ (match-string 4))))
+
+(defun org-footnote-at-definition-p ()
+ "Is the cursor at a footnote definition.
+This matches only pure definitions like [1] or [fn:name] at the beginning
+of a line. It does not a references like [fn:name:definition], where the
+footnote text is included and defined locally.
+The return value will be nil if not at a footnote definition, and a list
+with start and label of the footnote if there is a definition at point."
+ (save-excursion
+ (end-of-line 1)
+ (let ((lim (save-excursion (re-search-backward "^\\*+ \\|^[ \t]*$" nil t))))
+ (when (re-search-backward org-footnote-definition-re lim t)
+ (list (match-beginning 0) (match-string 2))))))
+
+(defun org-footnote-goto-definition (label)
+ "Find the definition of the footnote with label LABEL."
+ (interactive "sLabel: ")
+ (org-mark-ring-push)
+ (setq label (org-footnote-normalize-label label))
+ (let ((re (format "^\\[%s\\]\\|.\\[%s:" label label))
+ pos)
+ (save-excursion
+ (setq pos (or (re-search-forward re nil t)
+ (and (goto-char (point-min))
+ (re-search-forward re nil t))
+ (and (progn (widen) t)
+ (goto-char (point-min))
+ (re-search-forward re nil t)))))
+ (if (not pos)
+ (error "Cannot find definition of footnote %s" label)
+ (goto-char pos)
+ (org-show-context 'link-search)
+ (message "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'."))))
+
+(defun org-footnote-goto-previous-reference (label)
+ "Find the first closest (to point) reference of footnote with label LABEL."
+ (interactive "sLabel: ")
+ (org-mark-ring-push)
+ (setq label (org-footnote-normalize-label label))
+ (let ((re (format ".\\[%s[]:]" label))
+ (p0 (point)) pos)
+ (save-excursion
+ (setq pos (or (re-search-backward re nil t)
+ (and (goto-char (point-max))
+ (re-search-backward re nil t))
+ (and (progn (widen) t)
+ (goto-char p0)
+ (re-search-backward re nil t))
+ (and (goto-char (point-max))
+ (re-search-forward re nil t)))))
+ (if pos
+ (progn
+ (goto-char (match-end 0))
+ (org-show-context 'link-search))
+ (error "Cannot find reference of footnote %s" label))))
+
+(defun org-footnote-normalize-label (label)
+ (if (numberp label) (setq label (number-to-string label)))
+ (if (not (string-match "^[0-9]+$\\|^$\\|^fn:" label))
+ (setq label (concat "fn:" label)))
+ label)
+
+(defun org-footnote-all-labels ()
+ "Return list with all defined foot labels used in the buffer."
+ (let (rtn l)
+ (save-excursion
+ (save-restriction
+ (widen)
+ (goto-char (point-min))
+ (while (re-search-forward org-footnote-definition-re nil t)
+ (setq l (org-match-string-no-properties 2))
+ (and l (add-to-list 'rtn l)))
+ (goto-char (point-min))
+ (while (re-search-forward org-footnote-re nil t)
+ (setq l (or (org-match-string-no-properties 1)
+ (org-match-string-no-properties 2)))
+ (and l (not (equal l "fn:")) (add-to-list 'rtn l)))))
+ rtn))
+
+(defun org-footnote-unique-label (&optional current)
+ "Return a new unique footnote label.
+The returns the firsts fn:N labels that is currently not used."
+ (unless current (setq current (org-footnote-all-labels)))
+ (let ((fmt (if (eq org-footnote-auto-label 'plain) "%d" "fn:%d"))
+ (cnt 1))
+ (while (member (format fmt cnt) current)
+ (incf cnt))
+ (format fmt cnt)))
+
+(defvar org-footnote-label-history nil
+ "History of footnote labels entered in current buffer.")
+(make-variable-buffer-local 'org-footnote-label-history)
+
+(defun org-footnote-new ()
+ "Insert a new footnote.
+This command prompts for a label. If this is a label referencing an
+existing label, only insert the label. If the footnote label is empty
+or new, let the user edit the definition of the footnote."
+ (interactive)
+ (let* ((labels (org-footnote-all-labels))
+ (propose (org-footnote-unique-label labels))
+ (label
+ (if (member org-footnote-auto-label '(t plain))
+ propose
+ (completing-read
+ "Label (leave empty for anonymous): "
+ (mapcar 'list labels) nil nil
+ (if (eq org-footnote-auto-label 'confirm) propose nil)
+ 'org-footnote-label-history))))
+ (setq label (org-footnote-normalize-label label))
+ (cond
+ ((equal label "")
+ (insert "[fn:: ]")
+ (backward-char 1))
+ ((member label labels)
+ (insert "[" label "]")
+ (message "New reference to existing note"))
+ (org-footnote-define-inline
+ (insert "[" label ": ]")
+ (backward-char 1)
+ (org-footnote-auto-adjust-maybe))
+ (t
+ (insert "[" label "]")
+ (org-footnote-create-definition label)
+ (org-footnote-auto-adjust-maybe)))))
+
+(defun org-footnote-create-definition (label)
+ "Start the definition of a footnote with label LABEL."
+ (interactive "sLabel: ")
+ (setq label (org-footnote-normalize-label label))
+ (let (re)
+ (cond
+ ((org-mode-p)
+ (if (not org-footnote-section)
+ ;; No section, put footnote into the current outline node
+ nil
+ ;; Try to find or make the special node
+ (setq re (concat "^\\*+[ \t]+" org-footnote-section "[ \t]*$"))
+ (unless (or (re-search-forward re nil t)
+ (and (progn (widen) t)
+ (re-search-forward re nil t)))
+ (goto-char (point-max))
+ (insert "\n\n* " org-footnote-section "\n")))
+ ;; Now go to the end of this entry and insert there.
+ (org-footnote-goto-local-insertion-point)
+ (org-show-context 'link-search))
+ (t
+ (setq re (concat "^" org-footnote-tag-for-non-org-mode-files "[ \t]*$"))
+ (unless (re-search-forward re nil t)
+ (let ((max (if (and (derived-mode-p 'message-mode)
+ (re-search-forward message-signature-separator nil t))
+ (progn (beginning-of-line) (point))
+ (goto-char (point-max)))))
+ (skip-chars-backward " \t\r\n")
+ (delete-region (point) max)
+ (insert "\n\n")
+ (insert org-footnote-tag-for-non-org-mode-files "\n")))))
+ ;; Skip existing footnotes
+ (while (re-search-forward "^[[:space:]]*\\[[^]]+\\] " nil t)
+ (forward-line))
+ (insert "[" label "] \n")
+ (goto-char (1- (point)))
+ (message "Edit definition and go back with `C-c &' or, if unique, with `C-c C-c'.")))
+
+;;;###autoload
+(defun org-footnote-action (&optional special)
+ "Do the right thing for footnotes.
+When at a footnote reference, jump to the definition. When at a definition,
+jump to the references. When neither at definition or reference,
+create a new footnote, interactively.
+With prefix arg SPECIAL, offer additional commands in a menu."
+ (interactive "P")
+ (let (tmp c)
+ (cond
+ (special
+ (message "Footnotes: [s]ort | [r]enumber fn:N | [S]=r+s |->[n]umeric | [d]elete")
+ (setq c (read-char-exclusive))
+ (cond
+ ((equal c ?s)
+ (org-footnote-normalize 'sort))
+ ((equal c ?r)
+ (org-footnote-renumber-fn:N))
+ ((equal c ?S)
+ (org-footnote-renumber-fn:N)
+ (org-footnote-normalize 'sort))
+ ((equal c ?n)
+ (org-footnote-normalize))
+ ((equal c ?d)
+ (org-footnote-delete))
+ (t (error "No such footnote command %c" c))))
+ ((setq tmp (org-footnote-at-reference-p))
+ (if (nth 1 tmp)
+ (org-footnote-goto-definition (nth 1 tmp))
+ (goto-char (match-beginning 4))))
+ ((setq tmp (org-footnote-at-definition-p))
+ (org-footnote-goto-previous-reference (nth 1 tmp)))
+ (t (org-footnote-new)))))
+
+;;;###autoload
+(defun org-footnote-normalize (&optional sort-only for-preprocessor)
+ "Collect the footnotes in various formats and normalize them.
+This finds the different sorts of footnotes allowed in Org, and
+normalizes them to the usual [N] format that is understood by the
+Org-mode exporters.
+When SORT-ONLY is set, only sort the footnote definitions into the
+referenced sequence."
+ ;; This is based on Paul's function, but rewritten.
+ (let* ((limit-level
+ (and (boundp 'org-inlinetask-min-level)
+ org-inlinetask-min-level
+ (1- org-inlinetask-min-level)))
+ (nstars (and limit-level
+ (if org-odd-levels-only
+ (and limit-level (1- (* limit-level 2)))
+ limit-level)))
+ (outline-regexp
+ (concat "\\*" (if nstars (format "\\{1,%d\\} " nstars) "+ ")))
+ (count 0)
+ ref def idef ref-table beg beg1 marker a before ins-point)
+ (save-excursion
+ ;; Now find footnote references, and extract the definitions
+ (goto-char (point-min))
+ (while (re-search-forward org-footnote-re nil t)
+ (unless (or (org-in-commented-line) (org-in-verbatim-emphasis)
+ (org-inside-latex-macro-p))
+ (org-if-unprotected
+ (setq def (match-string 4)
+ idef def
+ ref (or (match-string 1) (match-string 2))
+ before (char-to-string (char-after (match-beginning 0))))
+ (if (equal ref "fn:") (setq ref nil))
+ (if (and ref (setq a (assoc ref ref-table)))
+ (progn
+ (setq marker (nth 1 a))
+ (unless (nth 2 a) (setf (caddr a) def)))
+ (setq marker (number-to-string (incf count))))
+ (save-match-data
+ (if def
+ (setq def (org-trim def))
+ (save-excursion
+ (goto-char (point-min))
+ (if (not (re-search-forward (concat "^\\[" (regexp-quote ref)
+ "\\]") nil t))
+ (setq def nil)
+ (setq beg (match-beginning 0))
+ (setq beg1 (match-end 0))
+ (re-search-forward
+ (org-re "^[ \t]*$\\|^\\*+ \\|^\\[\\([0-9]+\\|fn:[-_[:word:]]+\\)\\]")
+ nil 'move)
+ (setq def (buffer-substring beg1 (or (match-beginning 0)
+ (point-max))))
+ (goto-char beg)
+ (skip-chars-backward " \t\n\t")
+ (delete-region (1+ (point)) (match-beginning 0))))))
+ (unless sort-only
+ (replace-match (concat before "[" marker "]") t t)
+ (and idef
+ org-footnote-fill-after-inline-note-extraction
+ (fill-paragraph)))
+ (if (not a) (push (list ref marker def (if idef t nil))
+ ref-table)))))
+
+ ;; First find and remove the footnote section
+ (goto-char (point-min))
+ (cond
+ ((org-mode-p)
+ (if (and org-footnote-section
+ (re-search-forward
+ (concat "^\\*[ \t]+" (regexp-quote org-footnote-section)
+ "[ \t]*$")
+ nil t))
+ (if (or for-preprocessor (not org-footnote-section))
+ (replace-match "")
+ (org-back-to-heading t)
+ (forward-line 1)
+ (setq ins-point (point))
+ (delete-region (point) (org-end-of-subtree t)))
+ (goto-char (point-max))
+ (unless for-preprocessor
+ (when org-footnote-section
+ (or (bolp) (insert "\n"))
+ (insert "* " org-footnote-section "\n")
+ (setq ins-point (point))))))
+ (t
+ (if (re-search-forward
+ (concat "^"
+ (regexp-quote org-footnote-tag-for-non-org-mode-files)
+ "[ \t]*$")
+ nil t)
+ (replace-match ""))
+ (goto-char (point-max))
+ (skip-chars-backward " \t\n\r")
+ (delete-region (point) (point-max))
+ (insert "\n\n" org-footnote-tag-for-non-org-mode-files "\n")
+ (setq ins-point (point))))
+
+ ;; Insert the footnotes again
+ (goto-char (or ins-point (point-max)))
+ (setq ref-table (reverse ref-table))
+ (when sort-only
+ ;; remove anonymous and inline footnotes from the list
+ (setq ref-table
+ (delq nil (mapcar
+ (lambda (x) (and (car x)
+ (not (equal (car x) "fn:"))
+ (not (nth 3 x))
+ x))
+ ref-table))))
+ ;; Make sure each footnote has a description, or an error message.
+ (setq ref-table
+ (mapcar
+ (lambda (x)
+ (if (not (nth 2 x))
+ (setcar (cddr x)
+ (format "FOOTNOTE DEFINITION NOT FOUND: %s" (car x)))
+ (setcar (cddr x) (org-trim (nth 2 x))))
+ x)
+ ref-table))
+
+ (if (or (not (org-mode-p)) ; not an Org file
+ org-footnote-section ; we do not use a footnote section
+ (not sort-only) ; this is normalization
+ for-preprocessor) ; the is the preprocessor
+ ;; Insert the footnotes together in one place
+ (progn
+ (setq def
+ (mapconcat
+ (lambda (x)
+ (format "[%s] %s" (nth (if sort-only 0 1) x)
+ (org-trim (nth 2 x))))
+ ref-table "\n\n"))
+ (if ref-table (insert "\n" def "\n\n")))
+ ;; Insert each footnote near the first reference
+ ;; Happens only in Org files with no special footnote section,
+ ;; and only when doing sorting
+ (mapc 'org-insert-footnote-reference-near-definition
+ ref-table)))))
+
+(defun org-insert-footnote-reference-near-definition (entry)
+ "Find first reference of footnote ENTRY and insert the definition there.
+ENTRY is (fn-label num-mark definition)."
+ (when (car entry)
+ (goto-char (point-min))
+ (when (re-search-forward (format ".\\[%s[]:]" (regexp-quote (car entry)))
+ nil t)
+ (org-footnote-goto-local-insertion-point)
+ (insert (format "\n\n[%s] %s" (car entry) (nth 2 entry))))))
+
+(defun org-footnote-goto-local-insertion-point ()
+ "Find insertion point for footnote, just before next outline heading."
+ (org-with-limited-levels (outline-next-heading))
+ (or (bolp) (newline))
+ (beginning-of-line 0)
+ (while (and (not (bobp)) (= (char-after) ?#))
+ (beginning-of-line 0))
+ (if (looking-at "[ \t]*#\\+TBLFM:") (beginning-of-line 2))
+ (end-of-line 1)
+ (skip-chars-backward "\n\r\t ")
+ (forward-line))
+
+(defun org-footnote-delete (&optional label)
+ "Delete the footnote at point.
+This will remove the definition (even multiple definitions if they exist)
+and all references of a footnote label."
+ (catch 'done
+ (let (x label l beg def-re (nref 0) (ndef 0))
+ (unless label
+ (when (setq x (org-footnote-at-reference-p))
+ (setq label (nth 1 x))
+ (when (or (not label) (equal "fn:" label))
+ (delete-region (1+ (match-beginning 0)) (match-end 0))
+ (message "Anonymous footnote removed")
+ (throw 'done t)))
+ (when (and (not label) (setq x (org-footnote-at-definition-p)))
+ (setq label (nth 1 x)))
+ (unless label (error "Don't know which footnote to remove")))
+ (save-excursion
+ (save-restriction
+ (goto-char (point-min))
+ (while (re-search-forward org-footnote-re nil t)
+ (setq l (or (match-string 1) (match-string 2)))
+ (when (equal l label)
+ (delete-region (1+ (match-beginning 0)) (match-end 0))
+ (incf nref)))
+ (goto-char (point-min))
+ (setq def-re (concat "^\\[" (regexp-quote label) "\\]"))
+ (while (re-search-forward def-re nil t)
+ (setq beg (match-beginning 0))
+ (if (re-search-forward "^\\[\\|^[ \t]*$\\|^\\*+ " nil t)
+ (goto-char (match-beginning 0))
+ (goto-char (point-max)))
+ (delete-region beg (point))
+ (incf ndef))))
+ (org-footnote-auto-adjust-maybe)
+ (message "%d definition(s) of and %d reference(s) of footnote %s removed"
+ ndef nref label))))
+
+(defun org-footnote-renumber-fn:N ()
+ "Renumber the simple footnotes like fn:17 into a sequence in the document."
+ (interactive)
+ (let (map i (n 0))
+ (save-excursion
+ (save-restriction
+ (widen)
+ (goto-char (point-min))
+ (while (re-search-forward "\\[fn:\\([0-9]+\\)[]:]" nil t)
+ (setq i (string-to-number (match-string 1)))
+ (when (and (string-match "\\S-" (buffer-substring
+ (point-at-bol) (match-beginning 0)))
+ (not (assq i map)))
+ (push (cons i (number-to-string (incf n))) map)))
+ (goto-char (point-min))
+ (while (re-search-forward "\\(\\[fn:\\)\\([0-9]+\\)\\([]:]\\)" nil t)
+ (replace-match (concat "\\1" (cdr (assq (string-to-number (match-string 2)) map)) "\\3")))))))
+
+(defun org-footnote-auto-adjust-maybe ()
+ "Renumber and/or sort footnotes according to user settings."
+ (when (memq org-footnote-auto-adjust '(t renumber))
+ (org-footnote-renumber-fn:N))
+ (when (memq org-footnote-auto-adjust '(t sort))
+ (let ((label (nth 1 (org-footnote-at-definition-p))))
+ (org-footnote-normalize 'sort)
+ (when label
+ (goto-char (point-min))
+ (and (re-search-forward (concat "^\\[" (regexp-quote label) "\\]")
+ nil t)
+ (progn (insert " ")
+ (just-one-space)))))))
+
+(provide 'org-footnote)
+
+;; arch-tag: 1b5954df-fb5d-4da5-8709-78d944dbfc37
+
+;;; org-footnote.el ends here