;;; footnote.el --- footnote support for message mode  -*- coding: iso-latin-1;-*-

;; Copyright (C) 1997, 2000, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008 Free Software Foundation, Inc.

;; Author: Steven L Baur <steve@xemacs.org>
;; Keywords: mail, news
;; Version: 0.19

;; 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 provides footnote[1] support for message-mode in emacsen.
;; footnote-mode is implemented as a minor mode.

;; [1] Footnotes look something like this.  Along with some decorative
;; stuff.

;; TODO:
;; Reasonable Undo support.
;; more language styles.

;;; Code:

(eval-when-compile
  (require 'cl)
  (defvar filladapt-token-table))

(defgroup footnote nil
  "Support for footnotes in mail and news messages."
  :version "21.1"
  :group 'message)

(defcustom footnote-mode-line-string " FN"
  "String to display in modes section of the mode-line."
  :group 'footnote)

(defcustom footnote-mode-hook nil
  "Hook functions run when footnote-mode is activated."
  :type 'hook
  :group 'footnote)

(defcustom footnote-narrow-to-footnotes-when-editing nil
  "If non-nil, narrow to footnote text body while editing a footnote."
  :type 'boolean
  :group 'footnote)

(defcustom footnote-prompt-before-deletion t
  "If non-nil, prompt before deleting a footnote.
There is currently no way to undo deletions."
  :type 'boolean
  :group 'footnote)

(defcustom footnote-spaced-footnotes t
  "If non-nil, insert an empty line between footnotes.
Customizing this variable has no effect on buffers already
displaying footnotes."
  :type 'boolean
  :group 'footnote)

(defcustom footnote-use-message-mode t ; Nowhere used.
  "If non-nil, assume Footnoting will be done in `message-mode'."
  :type 'boolean
  :group 'footnote)

(defcustom footnote-body-tag-spacing 2
  "Number of spaces separating a footnote body tag and its text.
Customizing this variable has no effect on buffers already
displaying footnotes."
  :type 'integer
  :group 'footnote)

(defvar footnote-prefix [(control ?c) ?!]
  "*When not using `message-mode', the prefix to bind in `mode-specific-map'")

;;; Interface variables that probably shouldn't be changed

(defcustom footnote-section-tag "Footnotes: "
  "Tag inserted at beginning of footnote section.
If you set this to the empty string, no tag is inserted and the
value of `footnote-section-tag-regexp' is ignored.  Customizing
this variable has no effect on buffers already displaying
footnotes."
  :type 'string
  :group 'footnote)

(defcustom footnote-section-tag-regexp "Footnotes\\(\\[.\\]\\)?: "
  "Regexp which indicates the start of a footnote section.
This variable is disregarded when `footnote-section-tag' is the
empty string.  Customizing this variable has no effect on buffers
already displaying footnotes."
  :type 'regexp
  :group 'footnote)

;; The following three should be consumed by footnote styles.
(defcustom footnote-start-tag "["
  "String used to denote start of numbered footnote.
Should not be set to the empty string.  Customizing this variable
has no effect on buffers already displaying footnotes."
  :type 'string
  :group 'footnote)

(defcustom footnote-end-tag "]"
  "String used to denote end of numbered footnote.
Should not be set to the empty string.  Customizing this variable
has no effect on buffers already displaying footnotes."
  :type 'string
  :group 'footnote)

(defvar footnote-signature-separator (if (boundp 'message-signature-separator)
					 message-signature-separator
				       "^-- $")
  "*String used to recognize .signatures.")

;;; Private variables

(defvar footnote-style-number nil
  "Footnote style represented as an index into footnote-style-alist.")
(make-variable-buffer-local 'footnote-style-number)

(defvar footnote-text-marker-alist nil
  "List of markers pointing to text of footnotes in message buffer.")
(make-variable-buffer-local 'footnote-text-marker-alist)

(defvar footnote-pointer-marker-alist nil
  "List of markers pointing to footnote pointers in message buffer.")
(make-variable-buffer-local 'footnote-pointer-marker-alist)

(defvar footnote-mouse-highlight 'highlight
  "Text property name to enable mouse over highlight.")

(defvar footnote-mode nil
  "Variable indicating whether footnote minor mode is active.")
(make-variable-buffer-local 'footnote-mode)

;;; Default styles
;;; NUMERIC
(defconst footnote-numeric-regexp "[0-9]+"
  "Regexp for digits.")

(defun Footnote-numeric (n)
  "Numeric footnote style.
Use Arabic numerals for footnoting."
  (int-to-string n))

;;; ENGLISH UPPER
(defconst footnote-english-upper "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
  "Upper case English alphabet.")

(defconst footnote-english-upper-regexp "[A-Z]+"
  "Regexp for upper case English alphabet.")

(defun Footnote-english-upper (n)
  "Upper case English footnoting.
Wrapping around the alphabet implies successive repetitions of letters."
  (let* ((ltr (mod (1- n) (length footnote-english-upper)))
	 (rep (/ (1- n) (length footnote-english-upper)))
	 (chr (char-to-string (aref footnote-english-upper ltr)))
	 rc)
    (while (>= rep 0)
      (setq rc (concat rc chr))
      (setq rep (1- rep)))
    rc))

;;; ENGLISH LOWER
(defconst footnote-english-lower "abcdefghijklmnopqrstuvwxyz"
  "Lower case English alphabet.")

(defconst footnote-english-lower-regexp "[a-z]+"
  "Regexp of lower case English alphabet.")

(defun Footnote-english-lower (n)
  "Lower case English footnoting.
Wrapping around the alphabet implies successive repetitions of letters."
  (let* ((ltr (mod (1- n) (length footnote-english-lower)))
	 (rep (/ (1- n) (length footnote-english-lower)))
	 (chr (char-to-string (aref footnote-english-lower ltr)))
	 rc)
    (while (>= rep 0)
      (setq rc (concat rc chr))
      (setq rep (1- rep)))
    rc))

;;; ROMAN LOWER
(defconst footnote-roman-lower-list
  '((1 . "i") (5 . "v") (10 . "x")
    (50 . "l") (100 . "c") (500 . "d") (1000 . "m"))
  "List of roman numerals with their values.")

(defconst footnote-roman-lower-regexp "[ivxlcdm]+"
  "Regexp of roman numerals.")

(defun Footnote-roman-lower (n)
  "Generic Roman number footnoting."
  (Footnote-roman-common n footnote-roman-lower-list))

;;; ROMAN UPPER
(defconst footnote-roman-upper-list
  '((1 . "I") (5 . "V") (10 . "X")
    (50 . "L") (100 . "C") (500 . "D") (1000 . "M"))
  "List of roman numerals with their values.")

(defconst footnote-roman-upper-regexp "[IVXLCDM]+"
  "Regexp of roman numerals.  Not complete")

(defun Footnote-roman-upper (n)
  "Generic Roman number footnoting."
  (Footnote-roman-common n footnote-roman-upper-list))

(defun Footnote-roman-common (n footnote-roman-list)
  "Lower case Roman footnoting."
  (let* ((our-list footnote-roman-list)
	 (rom-lngth (length our-list))
	 (rom-high 0)
	 (rom-low 0)
	 (rom-div -1)
	 (count-high 0)
	 (count-low 0))
    ;; find surrounding numbers
    (while (and (<= count-high (1- rom-lngth))
		(>= n (car (nth count-high our-list))))
      ;; (message "Checking %d" (car (nth count-high our-list)))
      (setq count-high (1+ count-high)))
    (setq rom-high count-high)
    (setq rom-low (1- count-high))
    ;; find the appropriate divisor (if it exists)
    (while (and (= rom-div -1)
		(< count-low rom-high))
      (when (or (> n (- (car (nth rom-high our-list))
			(/ (car (nth count-low our-list))
			   2)))
		(= n (- (car (nth rom-high our-list))
			(car (nth count-low our-list)))))
	(setq rom-div count-low))
      ;; (message "Checking %d and %d in div loop" rom-high count-low)
      (setq count-low (1+ count-low)))
    ;;(message "We now have high: %d, low: %d, div: %d, n: %d"
    ;;	       rom-high rom-low (if rom-div rom-div -1) n)
    (let ((rom-low-pair (nth rom-low our-list))
	  (rom-high-pair (nth rom-high our-list))
	  (rom-div-pair (if (not (= rom-div -1)) (nth rom-div our-list) nil)))
      ;; (message "pairs are: rom-low: %S, rom-high: %S, rom-div: %S"
      ;;	  rom-low-pair rom-high-pair rom-div-pair)
      (cond
       ((< n 0) (error "Footnote-roman-common called with n < 0"))
       ((= n 0) "")
       ((= n (car rom-low-pair)) (cdr rom-low-pair))
       ((= n (car rom-high-pair)) (cdr rom-high-pair))
       ((= (car rom-low-pair) (car rom-high-pair))
	(concat (cdr rom-low-pair)
		(Footnote-roman-common
		 (- n (car rom-low-pair))
		 footnote-roman-list)))
       ((>= rom-div 0) (concat (cdr rom-div-pair) (cdr rom-high-pair)
			       (Footnote-roman-common
				(- n (- (car rom-high-pair)
					(car rom-div-pair)))
				footnote-roman-list)))
       (t (concat (cdr rom-low-pair)
		  (Footnote-roman-common
		   (- n (car rom-low-pair))
		   footnote-roman-list)))))))

;; Latin-1

(defconst footnote-latin-string "¹²³ºª§¶"
  "String of Latin-1 footnoting characters.")

;; Note not [...]+, because this style cycles.
(defconst footnote-latin-regexp (concat "[" footnote-latin-string "]")
  "Regexp for Latin-1 footnoting characters.")

(defun Footnote-latin (n)
  "Latin-1 footnote style.
Use a range of Latin-1 non-ASCII characters for footnoting."
  (string (aref footnote-latin-string
		(mod (1- n) (length footnote-latin-string)))))

;;; list of all footnote styles
(defvar footnote-style-alist
  `((numeric Footnote-numeric ,footnote-numeric-regexp)
    (english-lower Footnote-english-lower ,footnote-english-lower-regexp)
    (english-upper Footnote-english-upper ,footnote-english-upper-regexp)
    (roman-lower Footnote-roman-lower ,footnote-roman-lower-regexp)
    (roman-upper Footnote-roman-upper ,footnote-roman-upper-regexp)
    (latin Footnote-latin ,footnote-latin-regexp))
  "Styles of footnote tags available.
By default only boring Arabic numbers, English letters and Roman Numerals
are available.
See footnote-han.el, footnote-greek.el and footnote-hebrew.el for more
exciting styles.")

(defcustom footnote-style 'numeric
  "Default style used for footnoting.
numeric == 1, 2, 3, ...
english-lower == a, b, c, ...
english-upper == A, B, C, ...
roman-lower == i, ii, iii, iv, v, ...
roman-upper == I, II, III, IV, V, ...
latin == ¹ ² ³ º ª § ¶
See also variables `footnote-start-tag' and `footnote-end-tag'.

Customizing this variable has no effect on buffers already
displaying footnotes.  To change the style of footnotes in such a
buffer use the command `Footnote-set-style'."
  :type (cons 'choice (mapcar (lambda (x) (list 'const (car x)))
			      footnote-style-alist))
  :group 'footnote)

;;; Style utilities & functions
(defun Footnote-style-p (style)
  "Return non-nil if style is a valid style known to footnote-mode."
  (assq style footnote-style-alist))

(defun Footnote-index-to-string (index)
  "Convert a binary index into a string to display as a footnote.
Conversion is done based upon the current selected style."
  (let ((alist (if (Footnote-style-p footnote-style)
		   (assq footnote-style footnote-style-alist)
		 (nth 0 footnote-style-alist))))
    (funcall (nth 1 alist) index)))

(defun Footnote-current-regexp ()
  "Return the regexp of the index of the current style."
  (concat (nth 2 (or (assq footnote-style footnote-style-alist)
		     (nth 0 footnote-style-alist)))
	  "*"))

(defun Footnote-refresh-footnotes (&optional index-regexp)
  "Redraw all footnotes.
You must call this or arrange to have this called after changing footnote
styles."
  (unless index-regexp
    (setq index-regexp (Footnote-current-regexp)))
  (save-excursion
    ;; Take care of the pointers first
    (let ((i 0) locn alist)
      (while (setq alist (nth i footnote-pointer-marker-alist))
	(setq locn (cdr alist))
	(while locn
	  (goto-char (car locn))
	  ;; Try to handle the case where `footnote-start-tag' and
	  ;; `footnote-end-tag' are the same string.
	  (when (looking-back (concat
			       (regexp-quote footnote-start-tag)
			       "\\(" index-regexp "+\\)"
			       (regexp-quote footnote-end-tag))
			      (line-beginning-position))
	    (replace-match
	     (propertize
	      (concat
	       footnote-start-tag
	       (Footnote-index-to-string (1+ i))
	       footnote-end-tag)
	      'footnote-number (1+ i) footnote-mouse-highlight t)
	     nil "\\1"))
	  (setq locn (cdr locn)))
	(setq i (1+ i))))

    ;; Now take care of the text section
    (let ((i 0) alist)
      (while (setq alist (nth i footnote-text-marker-alist))
	(goto-char (cdr alist))
	(when (looking-at (concat
			   (regexp-quote footnote-start-tag)
			   "\\(" index-regexp "+\\)"
			   (regexp-quote footnote-end-tag)))
	  (replace-match
	   (propertize
	    (concat
	     footnote-start-tag
	     (Footnote-index-to-string (1+ i))
	     footnote-end-tag)
	    'footnote-number (1+ i))
	   nil "\\1"))
	(setq i (1+ i))))))

(defun Footnote-assoc-index (key alist)
  "Give index of key in alist."
  (let ((i 0) (max (length alist)) rc)
    (while (and (null rc)
		(< i max))
      (when (eq key (car (nth i alist)))
	(setq rc i))
      (setq i (1+ i)))
    rc))

(defun Footnote-cycle-style ()
  "Select next defined footnote style."
  (interactive)
  (let ((old (Footnote-assoc-index footnote-style footnote-style-alist))
	(max (length footnote-style-alist))
	idx)
    (setq idx (1+ old))
    (when (>= idx max)
      (setq idx 0))
    (setq footnote-style (car (nth idx footnote-style-alist)))
    (Footnote-refresh-footnotes (nth 2 (nth old footnote-style-alist)))))

(defun Footnote-set-style (&optional style)
  "Select a specific style."
  (interactive
   (list (intern (completing-read
		  "Footnote Style: "
		  obarray #'Footnote-style-p 'require-match))))
  (let ((old (Footnote-assoc-index footnote-style footnote-style-alist)))
    (setq footnote-style style)
    (Footnote-refresh-footnotes (nth 2 (nth old footnote-style-alist)))))

;; Internal functions
(defun Footnote-insert-numbered-footnote (arg &optional mousable)
  "Insert numbered footnote at (point)."
  (let ((string (concat footnote-start-tag
			(Footnote-index-to-string arg)
			footnote-end-tag)))
    (insert-before-markers
     (if mousable
	 (propertize
	  string 'footnote-number arg footnote-mouse-highlight t)
       (propertize string 'footnote-number arg)))))

(defun Footnote-renumber (from to pointer-alist text-alist)
  "Renumber a single footnote."
  (let* ((posn-list (cdr pointer-alist)))
    (setcar pointer-alist to)
    (setcar text-alist to)
    (while posn-list
      (goto-char (car posn-list))
      (when (looking-back (concat (regexp-quote footnote-start-tag)
				  (Footnote-current-regexp)
				  (regexp-quote footnote-end-tag))
			  (line-beginning-position))
	(replace-match
	 (propertize
	  (concat footnote-start-tag
		  (Footnote-index-to-string to)
		  footnote-end-tag)
	  'footnote-number to footnote-mouse-highlight t)))
      (setq posn-list (cdr posn-list)))
    (goto-char (cdr text-alist))
    (when (looking-at (concat (regexp-quote footnote-start-tag)
			      (Footnote-current-regexp)
			      (regexp-quote footnote-end-tag)))
      (replace-match
       (propertize
	(concat footnote-start-tag
		(Footnote-index-to-string to)
		footnote-end-tag)
	'footnote-number to)))))

;; Not needed?
(defun Footnote-narrow-to-footnotes ()
  "Restrict text in buffer to show only text of footnotes."
  (interactive)	; testing
  (goto-char (point-max))
  (when (re-search-backward footnote-signature-separator nil t)
    (let ((end (point)))
      (cond
       ((and (not (string-equal footnote-section-tag ""))
	     (re-search-backward
	      (concat "^" footnote-section-tag-regexp) nil t))
	(narrow-to-region (point) end))
       (footnote-text-marker-alist
	(narrow-to-region (cdar footnote-text-marker-alist) end))))))

(defun Footnote-goto-char-point-max ()
  "Move to end of buffer or prior to start of .signature."
  (goto-char (point-max))
  (or (re-search-backward footnote-signature-separator nil t)
      (point)))

(defun Footnote-insert-text-marker (arg locn)
  "Insert a marker pointing to footnote ARG, at buffer location LOCN."
  (let ((marker (make-marker)))
    (unless (assq arg footnote-text-marker-alist)
      (set-marker marker locn)
      (setq footnote-text-marker-alist
	    (cons (cons arg marker) footnote-text-marker-alist))
      (setq footnote-text-marker-alist
	    (Footnote-sort footnote-text-marker-alist)))))

(defun Footnote-insert-pointer-marker (arg locn)
  "Insert a marker pointing to footnote ARG, at buffer location LOCN."
  (let ((marker (make-marker))
	alist)
    (set-marker marker locn)
    (if (setq alist (assq arg footnote-pointer-marker-alist))
	(setf alist
	      (cons marker (cdr alist)))
      (setq footnote-pointer-marker-alist
	    (cons (cons arg (list marker)) footnote-pointer-marker-alist))
      (setq footnote-pointer-marker-alist
	    (Footnote-sort footnote-pointer-marker-alist)))))

(defun Footnote-insert-footnote (arg)
  "Insert a footnote numbered ARG, at (point)."
  (push-mark)
  (Footnote-insert-pointer-marker arg (point))
  (Footnote-insert-numbered-footnote arg t)
  (Footnote-goto-char-point-max)
  (if (cond
       ((not (string-equal footnote-section-tag ""))
	(re-search-backward (concat "^" footnote-section-tag-regexp) nil t))
       (footnote-text-marker-alist
	(goto-char (cdar footnote-text-marker-alist))))
      (save-restriction
	(when footnote-narrow-to-footnotes-when-editing
	  (Footnote-narrow-to-footnotes))
	(Footnote-goto-footnote (1- arg)) ; evil, FIXME (less evil now)
	;; (message "Inserting footnote %d" arg)
	(unless
	    (or (eq arg 1)
		(when (re-search-forward
		       (if footnote-spaced-footnotes
			   "\n\n"
			 (concat "\n"
				 (regexp-quote footnote-start-tag)
				 (Footnote-current-regexp)
				 (regexp-quote footnote-end-tag)))
		       nil t)
		  (unless (beginning-of-line) t))
		(Footnote-goto-char-point-max)
		(cond
		 ((not (string-equal footnote-section-tag ""))
		  (re-search-backward
		   (concat "^" footnote-section-tag-regexp) nil t))
		 (footnote-text-marker-alist
		  (goto-char (cdar footnote-text-marker-alist)))))))
    (unless (looking-at "^$")
      (insert "\n"))
    (when (eobp)
      (insert "\n"))
    (unless (string-equal footnote-section-tag "")
      (insert footnote-section-tag "\n")))
  (let ((old-point (point)))
    (Footnote-insert-numbered-footnote arg nil)
    (Footnote-insert-text-marker arg old-point)))

(defun Footnote-sort (list)
  (sort list (lambda (e1 e2)
	       (< (car e1) (car e2)))))

(defun Footnote-text-under-cursor ()
  "Return the number of footnote if in footnote text.
Return nil if the cursor is not positioned over the text of
a footnote."
  (when (and (let ((old-point (point)))
	       (save-excursion
		 (save-restriction
		   (Footnote-narrow-to-footnotes)
		   (and (>= old-point (point-min))
			(<= old-point (point-max))))))
	     (>= (point) (cdar footnote-text-marker-alist)))
    (let ((i 1)
	  alist-txt rc)
      (while (and (setq alist-txt (nth i footnote-text-marker-alist))
		  (null rc))
	(when (< (point) (cdr alist-txt))
	  (setq rc (car (nth (1- i) footnote-text-marker-alist))))
	(setq i (1+ i)))
      (when (and (null rc)
		 (null alist-txt))
	(setq rc (car (nth (1- i) footnote-text-marker-alist))))
      rc)))

(defun Footnote-under-cursor ()
  "Return the number of the footnote underneath the cursor.
Return nil if the cursor is not over a footnote."
  (or (get-text-property (point) 'footnote-number)
      (Footnote-text-under-cursor)))

;;; User functions

(defun Footnote-make-hole ()
  (save-excursion
    (let ((i 0)
	  (notes (length footnote-pointer-marker-alist))
	  alist-ptr alist-txt rc)
      (while (< i notes)
	(setq alist-ptr (nth i footnote-pointer-marker-alist))
	(setq alist-txt (nth i footnote-text-marker-alist))
	(when (< (point) (- (cadr alist-ptr) 3))
	  (unless rc
	    (setq rc (car alist-ptr)))
	  (save-excursion
	    (message "Renumbering from %s to %s"
		     (Footnote-index-to-string (car alist-ptr))
		     (Footnote-index-to-string
		      (1+ (car alist-ptr))))
	    (Footnote-renumber (car alist-ptr)
			       (1+ (car alist-ptr))
			       alist-ptr
			       alist-txt)))
	(setq i (1+ i)))
      rc)))

(defun Footnote-add-footnote (&optional arg)
  "Add a numbered footnote.
The number the footnote receives is dependent upon the relative location
of any other previously existing footnotes.
If the variable `footnote-narrow-to-footnotes-when-editing' is set,
the buffer is narrowed to the footnote body.  The restriction is removed
by using `Footnote-back-to-message'."
  (interactive "*P")
  (let (num)
    (if footnote-text-marker-alist
	(if (< (point) (cadar (last footnote-pointer-marker-alist)))
	    (setq num (Footnote-make-hole))
	  (setq num (1+ (caar (last footnote-text-marker-alist)))))
      (setq num 1))
    (message "Adding footnote %d" num)
    (Footnote-insert-footnote num)
    (insert-before-markers (make-string footnote-body-tag-spacing ? ))
    (let ((opoint (point)))
      (save-excursion
	(insert-before-markers
	 (if footnote-spaced-footnotes
	     "\n\n"
	   "\n"))
	(when footnote-narrow-to-footnotes-when-editing
	  (Footnote-narrow-to-footnotes)))
      ;; Emacs/XEmacs bug?  save-excursion doesn't restore point when using
      ;; insert-before-markers.
      (goto-char opoint))))

(defun Footnote-delete-footnote (&optional arg)
  "Delete a numbered footnote.
With no parameter, delete the footnote under (point).  With ARG specified,
delete the footnote with that number."
  (interactive "*P")
  (unless arg
    (setq arg (Footnote-under-cursor)))
  (when (and arg
	     (or (not footnote-prompt-before-deletion)
		 (y-or-n-p (format "Really delete footnote %d?" arg))))
    (let (alist-ptr alist-txt locn)
      (setq alist-ptr (assq arg footnote-pointer-marker-alist))
      (setq alist-txt (assq arg footnote-text-marker-alist))
      (unless (and alist-ptr alist-txt)
	(error "Can't delete footnote %d" arg))
      (setq locn (cdr alist-ptr))
      (while (car locn)
	(save-excursion
	  (goto-char (car locn))
	  (when (looking-back (concat (regexp-quote footnote-start-tag)
				      (Footnote-current-regexp)
				      (regexp-quote footnote-end-tag))
			      (line-beginning-position))
	    (delete-region (match-beginning 0) (match-end 0))))
	(setq locn (cdr locn)))
      (save-excursion
	(goto-char (cdr alist-txt))
	(delete-region
	 (point)
	 (if footnote-spaced-footnotes
	     (search-forward "\n\n" nil t)
	   (save-restriction
	     (end-of-line)
	     (next-single-char-property-change
	      (point) 'footnote-number nil (Footnote-goto-char-point-max))))))
      (setq footnote-pointer-marker-alist
	    (delq alist-ptr footnote-pointer-marker-alist))
      (setq footnote-text-marker-alist
	    (delq alist-txt footnote-text-marker-alist))
      (Footnote-renumber-footnotes)
      (when (and (null footnote-text-marker-alist)
		 (null footnote-pointer-marker-alist))
	(save-excursion
	  (if (not (string-equal footnote-section-tag ""))
	      (let* ((end (Footnote-goto-char-point-max))
		     (start (1- (re-search-backward
				 (concat "^" footnote-section-tag-regexp)
				 nil t))))
		(forward-line -1)
		(when (looking-at "\n")
		  (kill-line))
		(delete-region start (if (< end (point-max))
					 end
				       (point-max))))
	    (Footnote-goto-char-point-max)
	    (when (looking-back "\n\n")
	      (kill-line -1))))))))

(defun Footnote-renumber-footnotes (&optional arg)
  "Renumber footnotes, starting from 1."
  (interactive "*P")
  (save-excursion
    (let ((i 0)
	  (notes (length footnote-pointer-marker-alist))
	  alist-ptr alist-txt)
      (while (< i notes)
	(setq alist-ptr (nth i footnote-pointer-marker-alist))
	(setq alist-txt (nth i footnote-text-marker-alist))
	(unless (= (1+ i) (car alist-ptr))
	  (Footnote-renumber (car alist-ptr) (1+ i) alist-ptr alist-txt))
	(setq i (1+ i))))))

(defun Footnote-goto-footnote (&optional arg)
  "Jump to the text of a footnote.
With no parameter, jump to the text of the footnote under (point).  With ARG
specified, jump to the text of that footnote."
  (interactive "P")
  (unless arg
    (setq arg (Footnote-under-cursor)))
  (let ((footnote (assq arg footnote-text-marker-alist)))
    (cond
     (footnote
      (goto-char (cdr footnote)))
     ((eq arg 0)
      (goto-char (point-max))
      (cond
       ((not (string-equal footnote-section-tag ""))
	(re-search-backward (concat "^" footnote-section-tag-regexp))
	(forward-line 1))
       (footnote-text-marker-alist
	(goto-char (cdar footnote-text-marker-alist)))))
     (t
      (error "I don't see a footnote here")))))

(defun Footnote-back-to-message (&optional arg)
  "Move cursor back to footnote referent.
If the cursor is not over the text of a footnote, point is not changed.
If the buffer was narrowed due to `footnote-narrow-to-footnotes-when-editing'
being set it is automatically widened."
  (interactive "P")
  (let ((note (Footnote-text-under-cursor)))
    (when note
      (when footnote-narrow-to-footnotes-when-editing
	(widen))
      (goto-char (cadr (assq note footnote-pointer-marker-alist))))))

(defvar footnote-mode-map nil
  "Keymap used for footnote minor mode.")

;; Set up our keys
(unless footnote-mode-map
  (setq footnote-mode-map (make-sparse-keymap))
  (define-key footnote-mode-map "a" 'Footnote-add-footnote)
  (define-key footnote-mode-map "b" 'Footnote-back-to-message)
  (define-key footnote-mode-map "c" 'Footnote-cycle-style)
  (define-key footnote-mode-map "d" 'Footnote-delete-footnote)
  (define-key footnote-mode-map "g" 'Footnote-goto-footnote)
  (define-key footnote-mode-map "r" 'Footnote-renumber-footnotes)
  (define-key footnote-mode-map "s" 'Footnote-set-style))

(defvar footnote-minor-mode-map nil
  "Keymap used for binding footnote minor mode.")

(unless footnote-minor-mode-map
  (define-key global-map footnote-prefix footnote-mode-map))

;;;###autoload
(defun footnote-mode (&optional arg)
  "Toggle footnote minor mode.
\\<message-mode-map>
This minor mode provides footnote support for `message-mode'.  To get
started, play around with the following keys:
key		binding
---		-------
\\[Footnote-add-footnote]		Footnote-add-footnote
\\[Footnote-back-to-message]		Footnote-back-to-message
\\[Footnote-delete-footnote]		Footnote-delete-footnote
\\[Footnote-goto-footnote]		Footnote-goto-footnote
\\[Footnote-renumber-footnotes]		Footnote-renumber-footnotes
\\[Footnote-cycle-style]		Footnote-cycle-style
\\[Footnote-set-style]		Footnote-set-style
"
  (interactive "*P")
  ;; (filladapt-mode t)
  (setq footnote-mode
	(if (null arg) (not footnote-mode)
	  (> (prefix-numeric-value arg) 0)))
  (when footnote-mode
    ;; (Footnote-setup-keybindings)
    (make-local-variable 'footnote-style)
    (make-local-variable 'footnote-body-tag-spacing)
    (make-local-variable 'footnote-spaced-footnotes)
    (make-local-variable 'footnote-section-tag)
    (make-local-variable 'footnote-section-tag-regexp)
    (make-local-variable 'footnote-start-tag)
    (make-local-variable 'footnote-end-tag)
    (if (fboundp 'force-mode-line-update)
	(force-mode-line-update)
      (set-buffer-modified-p (buffer-modified-p)))

    (when (boundp 'filladapt-token-table)
      ;; add tokens to filladapt to match footnotes
      ;; 1] xxxxxxxxxxx x x x or [1] x x x x x x x
      ;;    xxx x xx xxx xxxx	     x x x xxxxxxxxxx
      (let ((bullet-regexp (concat (regexp-quote footnote-start-tag)
				   "?[0-9a-zA-Z]+"
				   (regexp-quote footnote-end-tag)
				   "[ \t]")))
	(unless (assoc bullet-regexp filladapt-token-table)
	  (setq filladapt-token-table
		(append filladapt-token-table
			(list (list bullet-regexp 'bullet)))))))

    (run-hooks 'footnote-mode-hook)))

(unless (assq 'footnote-mode minor-mode-alist)
  (setq minor-mode-alist
	(cons '(footnote-mode footnote-mode-line-string)
	      minor-mode-alist)))

(provide 'footnote)

;; arch-tag: 9bcfb6d7-2161-4caf-8793-700f62400398
;;; footnote.el ends here