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[emacs.git] / lisp / textmodes / bibtex.el

;;; bibtex.el --- BibTeX mode for GNU Emacs

;; Author: Bengt Martensson <ubrinf!mond!bengt>
;;      Mark Shapiro <shapiro@corto.inria.fr>
;;      Mike Newton <newton@gumby.cs.caltech.edu>
;;      Aaron Larson <alarson@src.honeywell.com>
;; Maintainer: Mark Shapiro <shapiro@corto.inria.fr>
;; Keywords: tex, bib

;; Copyright (C) 1992 Free Software Foundation, Inc.

;; 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 1, 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; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Change Log:

;;; alarson@src.honeywell.com 92-Jan-31
;;;   Added support for: ispell, beginning/end of entry movement, a simple
;;;   outline like mode (hide the bodies of bibtex entries), support for
;;;   sorting bibtex entries, and maintaining them in sorted order, and
;;;   simple buffer validation.
;;;   User visible functions added:
;;;      ispell-{abstract,bibtex-entry}, {beginning,end}-of-bibtex-entry
;;;      hide-bibtex-entry-bodies, sort-bibtex-entries, validate-bibtex-
;;;      buffer, find-bibtex-duplicates
;;;   user visible variables added:
;;;      bibtex-maintain-sorted-entries
;;;   new local keybindings:
;;;     "       TeX-insert-quote
;;;     C-c$   ispell-bibtex-entry
;;;     M-C-a  beginning-of-bibtex-entry
;;;     M-C-e  end-of-bibtex-entry
;;; Mike Newton (newton@gumby.cs.caltech.edu) 90.11.17
;;;  * Handle items like
;;;          title = poft # "Fifth Tri-quaterly" # random-conf,
;;;    and   title = {This title is inside curlies}
;;;  * added user settable, always present, optional fields
;;;  * fixed 'bibtex-find-it's doc string's location
;;;  * bibtex-field-text made more general (it wouldnt handle the # construct)
;;;             and it now handles a small subset of the {} cases

;;; Bengt Martensson, March 6
;;;   Adapted to Bibtex 0.99 by updating the optional fields according
;;;   to the document BibTeXing, Oren Patashnik, dated January 31, 1988.
;;;   Updated documentation strings accordingly.  Added (provide 'bibtex).
;;;   If bibtex-include-OPT-crossref is non-nil, every entry will have
;;;   an OPTcrossref field, analogously for bibtex-include-OPTkey and
;;;   bibtex-include-OPTannote.  Added bibtex-preamble, bound to ^C^EP,
;;;   and also found in X- and sun-menus.  Cleaned up the sun-menu
;;;   stuff, and made it more uniform with the X-menu stuff.  Marc: I
;;;   strongly suspect that I broke your parsing...  (Or, more
;;;   correctly, BibTeX 0.99 broke it.)
;;;   Added bibtex-clean-entry-zap-empty-opts, defvar'd to t.  If it
;;;   is nil, bibtex-clean-entry will leave empty optional fields alone.

;;; Marc Shapiro 1-feb-89: integrated changes by Bengt Martensson 88-05-06:
;;;   Added Sun menu support.  Locally bound to right mouse button in 
;;;   bibtex-mode.  Emacs 18.49 allows local mouse bindings!!
;;;   Commented out DEAthesis.

;;; Marc Shapiro 6-oct-88
;;;  * skip-whitespace replaced by skip-chars-forward
;;;  * use indent-to-column instead of inserting tabs (changes to 
;;;    bibtex-entry, bibtex-make-entry, bibtex-make-OPT-entry, renamed to
;;;    bibtex-make-optional-entry)
;;;  * C-c C-k deletes the current OPT entry entirely
;;;  * C-c C-d replaces text of field with ""
;;;  * renamed bibtex-find-it to bibtex-find-text.  With arg, now goes to
;;;    start of text.  Fixed bugs in it.

;;; Marc Shapiro 23-sep-88
;;;  * bibtex-clean-entry moves past end of entry.
;;;  * bibtex-clean-entry signals mandatory fields left empty.

;;; Marc Shapiro 18-jul-88
;;;  * Fixed bug in bibtex-flash-entry
;;;  * Moved all the entry type keystrokes to "C-c C-e something" (instead of
;;;    "C-c something" previously) to make room for more.  C-c C-e is
;;;    supposed to stand for "entry" [idea taken from mail-mode].  Moved
;;;    bibtex-pop-previous to C-c C-p and bibtex-pop-next to C-c C-n.
;;;  * removed binding for "\e[25~"
;;;  * replaced bibtex-clean-optionals by bibtex-clean-entry, bound to
;;;    C-c C-c

;;; Marc Shapiro 13-jul-88 [based on ideas by Sacha Krakowiak of IMAG]
;;;  * bibtex-pop-previous replaces current field with value of
;;;    similar field in previous entry.  May be called n times in a row
;;;    (or with arg n) to pop similar field of n'th previous entry.
;;;    There is also a bibtex-pop-next to get similar field of next
;;;    entry.
;;;  * C-c C-k now kills all empty optional fields of current entry, and
;;;    removes "OPT" for those optional fields which have text. 

;;; Marc Shapiro 14-dec-87
;;;   Cosmetic fixes.  Fixed small bug in bibtex-move-outside-of-entry.
;;; Skip Montanaro <steinmetz!sprite!montanaro> 7-dec-87, Shapiro 10-dec-87
;;;   before inserting an entry, make sure we are outside of a bib entry
;;; Marc Shapiro 3-nov-87
;;;   addition for France: DEAthesis
;;; Marc Shapiro 19-oct-1987
;;;   add X window menu option; bug fixes. TAB, LFD, C-c " and C-c C-o now
;;;   behave consistently; deletion never occurs blindly.
;;; Marc Shapiro <shapiro@inria.inria.fr> 15-oct-1986
;;;    align long lines nicely; C-c C-o checks for the "OPT" string;
;;;    TAB goes to the end of the string; use lower case; use
;;;    run-hooks

;;; Bengt Martensson <ubrinf!mond!bengt> 87-06-28
;;; Bengt Martensson <bengt@mathematik.uni-Bremen.de> 87-06-28
;;;   Original version

;;; NOTE by Marc Shapiro, 14-dec-87:
;;; (bibtex-x-environment) binds an X menu for bibtex mode to x-button-c-right.
;;; Trouble is, in Emacs 18.44 you can't have a mode-specific mouse binding,
;;; so it will remain active in all windows.  Yuck!

;;; Code:

(provide 'bibtex)

;;; these guys typically don't have autoloads...[alarson:19920131.1548CST]
(if (not (fboundp 'TeX-insert-quote))
    (autoload 'TeX-insert-quote "tex-mode"))
(if (not (fboundp 'sort-subr))
    (autoload 'sort-subr "sort"))



(defvar bibtex-mode-syntax-table nil "")
(defvar bibtex-mode-abbrev-table nil "")
(define-abbrev-table 'bibtex-mode-abbrev-table ())
(defvar bibtex-mode-map (make-sparse-keymap) "")

(defvar bibtex-pop-previous-search-point nil
  "Next point where bibtex-pop-previous should start looking for a similar
entry.")

(defvar bibtex-pop-next-search-point nil
  "Next point where bibtex-pop-next should start looking for a similar
entry.")

(defvar bibtex-clean-entry-zap-empty-opts t
  "*If non-nil, bibtex-clean-entry will delete all empty optional fields.")

(defvar bibtex-include-OPTcrossref t
  "*If non-nil, all entries will have an OPTcrossref field.")
(defvar bibtex-include-OPTkey t
  "*If non-nil, all entries will have an OPTkey field.")
(defvar bibtex-include-OPTannote t
  "*If non-nil, all entries will have an OPTannote field.")

;; note: the user should be allowed to have their own list of always
;;       available optional fields.  exs: "keywords" "categories"

(defvar bibtex-mode-user-optional-fields nil            ;no default value
  "*List of optional fields that user want to have as always present 
when making a bibtex entry.  One possibility is for ``keywords''")


;;; A bibtex file is a sequence of entries, either string definitions
;;; or reference entries.  A reference entry has a type part, a
;;; key part, and a comma-separated sequence of fields.  A string
;;; entry has a single field.  A field has a left and right part,
;;; separated by a '='.  The left part is the name, the right part is
;;; the text.  Here come the definitions allowing to create and/or parse
;;; entries and fields:

;;; fields
(defun bibtex-cfield (name text)
  "Create a regexp for a bibtex field of name NAME and text TEXT"
  (concat ",[ \t\n]*\\("
          name
          "\\)[ \t\n]*=[ \t\n]*\\("
          text
          "\\)"))
(defconst bibtex-name-in-cfield 1
  "The regexp subexpression number of the name part in bibtex-cfield.")
(defconst bibtex-text-in-cfield 2
  "The regexp subexpression number of the text part in bibtex-cfield.")

(defconst bibtex-field-name "[A-Za-z][---A-Za-z0-9:_+]*"
  "Regexp defining the name part of a bibtex field.")

;; bibtex-field-text must be able to handle
;;   title = "Proc. Fifteenth Annual" # STOC,
;;   month = "10~" # jan,
;;   year = "{\noopsort{1973c}}1981",
;;   month = apr # "-" # may,
;;   key = {Volume-2},
;;   note = "Volume~2 is listed under Knuth \cite{book-full}"
;; i have added a few of these, but not all! -- MON

(defconst bibtex-field-const
  "[0-9A-Za-z][---A-Za-z0-9:_+]*"
  "Format of a bibtex field constant.")

(defconst bibtex-field-string
  (concat
    "\"[^\"]*[^\\\\]\"\\|\"\"")
  "Match either a string or an empty string.")

(defconst bibtex-field-string-or-const
  (concat bibtex-field-const "\\|" bibtex-field-string)
  "Match either bibtex-field-string or bibtex-field-const.")

(defconst bibtex-field-text
  (concat
    "\\(" bibtex-field-string-or-const "\\)"
        "\\([ \t\n]+#[ \t\n]+\\(" bibtex-field-string-or-const "\\)\\)*\\|"
    "{[^{}]*[^\\\\]}")
  "Regexp defining the text part of a bibtex field: either a string, or
an empty string, or a constant followed by one or more # / constant pairs.
Also matches simple {...} patterns.")

;(defconst bibtex-field-text
;  "\"[^\"]*[^\\\\]\"\\|\"\"\\|[0-9A-Za-z][---A-Za-z0-9:_+]*"
;  "Regexp defining the text part of a bibtex field: either a string, or an empty string, or a constant.")

(defconst bibtex-field
  (bibtex-cfield bibtex-field-name bibtex-field-text)
  "Regexp defining the format of a bibtex field")

(defconst bibtex-name-in-field bibtex-name-in-cfield
  "The regexp subexpression number of the name part in bibtex-field")
(defconst bibtex-text-in-field bibtex-text-in-cfield
  "The regexp subexpression number of the text part in bibtex-field")

;;; references
(defconst bibtex-reference-type
  "@[A-Za-z]+"
  "Regexp defining the type part of a bibtex reference entry")
(defconst bibtex-reference-head
  (concat "^[ \t]*\\("
          bibtex-reference-type
          "\\)[ \t]*[({]\\("
          bibtex-field-name
          "\\)")
  "Regexp defining format of the header line of a bibtex reference entry")
(defconst bibtex-type-in-head 1
  "The regexp subexpression number of the type part in bibtex-reference-head")
(defconst bibtex-key-in-head 2
  "The regexp subexpression number of the key part in
bibtex-reference-head")

(defconst bibtex-reference
  (concat bibtex-reference-head
          "\\([ \t\n]*" bibtex-field "\\)*"
          "[ \t\n]*[})]")
  "Regexp defining the format of a bibtex reference entry")
(defconst bibtex-type-in-reference bibtex-type-in-head
  "The regexp subexpression number of the type part in bibtex-reference")
(defconst bibtex-key-in-reference bibtex-key-in-head
  "The regexp subexpression number of the key part in
bibtex-reference")

;;; strings
(defconst bibtex-string
  (concat "^[ \t]*@[sS][tT][rR][iI][nN][gG][ \t\n]*[({][ \t\n]*\\("
          bibtex-field-name
          "\\)[ \t\n]*=[ \t\n]*\\("
          bibtex-field-text
          "\\)[ \t\n]*[})]")
  "Regexp defining the format of a bibtex string entry")
(defconst bibtex-name-in-string 1
  "The regexp subexpression of the name part in bibtex-string")
(defconst bibtex-text-in-string 2
  "The regexp subexpression of the text part in bibtex-string")

(defconst bibtex-name-alignement 2
  "Alignment for the name part in BibTeX fields.
Chosen on aesthetic grounds only.")

(defconst bibtex-text-alignment (length "  organization = ")
  "Alignment for the text part in BibTeX fields.
Equal to the space needed for the longest name part.")

;;; bibtex mode:

(defun bibtex-mode () 
  "Major mode for editing bibtex files.

\\{bibtex-mode-map}

A command such as \\[bibtex-Book] will outline the fields for a BibTeX book entry.

The optional fields start with the string OPT, and thus ignored by BibTeX.
The OPT string may be removed from a field with \\[bibtex-remove-OPT].
\\[bibtex-kill-optional-field] kills the current optional field entirely.
\\[bibtex-remove-double-quotes] removes the double-quotes around the text of
the current field.  \\[bibtex-empty-field] replaces the text of the current
field with the default \"\".

The command \\[bibtex-clean-entry] cleans the current entry, i.e. (i) removes
double-quotes from entirely numerical fields, (ii) removes OPT from all
non-empty optional fields, (iii) removes all empty optional fields, and (iv)
checks that no non-optional fields are empty.

Use \\[bibtex-find-text] to position the dot at the end of the current field.
Use \\[bibtex-next-field] to move to end of the next field.

\\[bibtex-x-environment] binds a mode-specific X menu to control+right
mouse button.
\\[bibtex-sun-environment] binds a mode-specific Sun menu to right
mouse button.

Fields:
    address
           Publisher's address
    annote
           Long annotation used for annotated bibliographies (begins sentence)
    author
           Name(s) of author(s), in BibTeX name format
    booktitle
           Book title when the thing being referenced isn't the whole book.
           For book entries, the title field should be used instead.
    chapter
           Chapter number
    crossref
           The database key of the entry being cross referenced.
    edition
           Edition of a book (e.g., ""second"")
    editor
           Name(s) of editor(s), in BibTeX name format.
           If there is also an author field, then the editor field should be
           for the book or collection that the work appears in
    howpublished
            How something strange has been published (begins sentence)
    institution
           Sponsoring institution
    journal
           Journal name (macros are provided for many)
    key
           Alphabetizing and labeling key (needed when no author or editor)
    month
           Month (macros are provided)
    note
           To help the reader find a reference (begins sentence)
    number
           Number of a journal or technical report
    organization
           Organization (sponsoring a conference)
    pages
           Page number or numbers (use `--' to separate a range)
    publisher
           Publisher name
    school
           School name (for theses)
    series
           The name of a series or set of books.
           An individual book will will also have it's own title
    title
           The title of the thing being referenced
    type
           Type of a technical report (e.g., ""Research Note"") to be used
           instead of the default ""Technical Report""
    volume
           Volume of a journal or multivolume work
    year
           Year---should contain only numerals
---------------------------------------------------------
Entry to this mode calls the value of bibtex-mode-hook if that value is
non-nil."
  (interactive)
  (kill-all-local-variables)
  (if bibtex-mode-syntax-table
      (set-syntax-table bibtex-mode-syntax-table)
     (setq bibtex-mode-syntax-table (make-syntax-table))
     (set-syntax-table bibtex-mode-syntax-table)
     (modify-syntax-entry ?\" ".")
     (modify-syntax-entry ?$ "$$  ")
     (modify-syntax-entry ?% "<   ")
     (modify-syntax-entry ?'  "w   ")
     (modify-syntax-entry ?@  "w   ")
     (modify-syntax-entry ?\\ "\\")
     (modify-syntax-entry ?\f ">   ")
     (modify-syntax-entry ?\n ">   ")
     (modify-syntax-entry ?~ " "))
  (use-local-map bibtex-mode-map)
  (setq major-mode 'bibtex-mode)


  (setq mode-name "BibTeX")
  (set-syntax-table bibtex-mode-syntax-table)
  (setq local-abbrev-table bibtex-mode-abbrev-table)
  (make-local-variable 'paragraph-start)
  (setq paragraph-start "^[ \f\n\t]*$")

  (define-key bibtex-mode-map "\t" 'bibtex-find-text)
  (define-key bibtex-mode-map "\n" 'bibtex-next-field)
  (define-key bibtex-mode-map "\C-c\"" 'bibtex-remove-double-quotes)
  (define-key bibtex-mode-map "\C-c\C-c" 'bibtex-clean-entry)
  (define-key bibtex-mode-map "\C-c?" 'describe-mode)
  (define-key bibtex-mode-map "\C-c\C-p" 'bibtex-pop-previous)
  (define-key bibtex-mode-map "\C-c\C-n" 'bibtex-pop-next)
  (define-key bibtex-mode-map "\C-c\C-k" 'bibtex-kill-optional-field)
  (define-key bibtex-mode-map "\C-c\C-d" 'bibtex-empty-field)

  ;; [alarson:19920131.1543CST]
  (define-key bibtex-mode-map "\""   'TeX-insert-quote)
  (define-key bibtex-mode-map "\C-c$"   'ispell-bibtex-entry)
  (define-key bibtex-mode-map "\M-\C-a"   'beginning-of-bibtex-entry)
  (define-key bibtex-mode-map "\M-\C-e"   'end-of-bibtex-entry)

  (define-key bibtex-mode-map "\C-c\C-e\C-a" 'bibtex-Article)
  (define-key bibtex-mode-map "\C-c\C-e\C-b" 'bibtex-Book)
  (define-key bibtex-mode-map "\C-c\C-e\C-d" 'bibtex-DEAthesis)
  (define-key bibtex-mode-map "\C-c\C-e\C-c" 'bibtex-InProceedings)
  (define-key bibtex-mode-map "\C-c\C-e\C-i" 'bibtex-InBook)
  (define-key bibtex-mode-map "\C-c\C-ei" 'bibtex-InCollection)
  (define-key bibtex-mode-map "\C-c\C-eI" 'bibtex-InProceedings)
  (define-key bibtex-mode-map "\C-c\C-e\C-m" 'bibtex-Manual)
  (define-key bibtex-mode-map "\C-c\C-em" 'bibtex-MastersThesis)
  (define-key bibtex-mode-map "\C-c\C-eM" 'bibtex-Misc)
  (define-key bibtex-mode-map "\C-c\C-o" 'bibtex-remove-OPT)
  (define-key bibtex-mode-map "\C-c\C-e\C-p" 'bibtex-PhdThesis)
  (define-key bibtex-mode-map "\C-c\C-ep" 'bibtex-Proceedings)
  (define-key bibtex-mode-map "\C-c\C-eP" 'bibtex-preamble)
  (define-key bibtex-mode-map "\C-c\C-e\C-t" 'bibtex-TechReport)
  (define-key bibtex-mode-map "\C-c\C-e\C-s" 'bibtex-string)
  (define-key bibtex-mode-map "\C-c\C-e\C-u" 'bibtex-Unpublished)

  (auto-fill-mode 1)                    ; nice alignements
  (setq left-margin (+ bibtex-text-alignment 1))

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

(defun bibtex-move-outside-of-entry ()
  "Make sure we are outside of a bib entry"
  (cond ((or
          (= (point) (point-max))
          (= (point) (point-min))
          (looking-at "[ \n]*@")
          )
         t)
        (t
         (backward-paragraph)
         (forward-paragraph)))
  (re-search-forward "[ \t\n]*" (point-max) t))

(defun ispell-abstract ()
  (interactive)
  (beginning-of-bibtex-entry)
  (re-search-forward "^[ \t]*[OPT]*abstract[ \t]*=")
  (ispell-region (point)
                 (save-excursion (forward-sexp) (point))))

(defun beginning-of-bibtex-entry ()
  (interactive)
  (re-search-backward "^@" nil 'move))

(defun end-of-bibtex-entry ()
  (interactive)
  (re-search-forward "}$" nil 'move))
  
(defun ispell-bibtex-entry ()
  (interactive)
  (ispell-region (progn (beginning-of-bibtex-entry) (point))
                 (progn (end-of-bibtex-entry) (point))))

(defun narrow-to-bibtex-entry ()
  (interactive)
  (save-excursion
    (narrow-to-region (progn (beginning-of-bibtex-entry) (point))
                      (progn (end-of-bibtex-entry) (point)))))


(defun beginning-of-first-bibtex-entry ()
  (goto-char (point-min))
  (cond
   ((re-search-forward "^@" nil 'move)
    (beginning-of-line))
   ((and (bobp) (eobp))
    nil)
   (t
    (message "Warning: No bibtex entries found!"))))

(defun hide-bibtex-entry-bodies (&optional arg)
  "Hide all lines between first and last bibtex entries not beginning with @.
With argument, show all text."
  (interactive "P")
  (beginning-of-first-bibtex-entry)
  ;; subst-char-in-region modifies the buffer, despite what the
  ;; documentation says...
  (let ((modifiedp (buffer-modified-p))
        (buffer-read-only nil))
    (if arg
        (subst-char-in-region (point) (point-max) ?\r ?\n t)
        (while (save-excursion (re-search-forward "\n[^@]" (point-max) t))
          (save-excursion (replace-regexp "\n\\([^@]\\)" "\r\\1"))))
    (setq selective-display (not arg))
    (set-buffer-modified-p modifiedp)))

(defun sort-bibtex-entries ()
  "Sort bibtex entries alphabetically by key.
Text before the first bibtex entry, and following the last is not effected.
Bugs:
  1. Text between the closing brace ending one bibtex entry, and the @ starting 
     the next, is considered part of the PRECEEDING entry.  Perhaps it should be
     part of the following entry."
  (interactive)
  (save-restriction
    (beginning-of-first-bibtex-entry)
    (narrow-to-region (point)
                      (save-excursion
                        (goto-char (point-max))
                        (beginning-of-bibtex-entry)
                        (end-of-bibtex-entry)
                        (point)))
    (sort-subr nil                      ; reversep
               ;; begining of record function
               'forward-line
               ;; end of record function
               (function (lambda () (and (re-search-forward "}[ \t]*\n[\n \t]*@" nil 'move)
                                         (forward-char -2))))
               ;; start of key function
               (function (lambda () (re-search-forward "{[ \t]*") nil))
               ;; end of key function
               (function (lambda () (search-forward ",")))
               )))
  
(defun map-bibtex-entries (fun)
  "Call FUN for each bibtex entry starting with the current, to the end of the file.
FUN is called with one argument, the key of the entry, and with point inside the entry."
  (beginning-of-bibtex-entry)
  (while (re-search-forward "^@[^{]*{[ \t]*\\([^,]*\\)" nil t)
    (funcall fun (buffer-substring (match-beginning 1) (match-end 1)))))
  
(defun find-bibtex-entry-location (entry-name)
  (interactive "sBibtex entry key: ")
  "Searches from beginning of current buffer looking for place to put the
bibtex entry named ENTRY-NAME.  Buffer is assumed to be in sorted order,
without duplicates (see \\[sort-bibtex-entries]), if it is not, an error will
be signalled."
  (let ((previous nil)
        point)
    (beginning-of-first-bibtex-entry)
    (or (catch 'done
          (map-bibtex-entries (function (lambda (current)
                                 (cond
                                  ((string-equal entry-name current)
                                   (error "Entry duplicates existing!"))
                                  ((or (null previous)
                                       (string< previous current))
                                   (setq previous current
                                         point (point))
                                   (if (string< entry-name current)
                                       (progn
                                         (beginning-of-bibtex-entry)
                                         ;; Many schemes append strings to
                                         ;; existing entries to resolve them,
                                         ;; so initial substring matches may
                                         ;; indicate a duplicate entry.  
                                         (let ((idx (string-match (regexp-quote entry-name) current)))
                                           (if (and (integerp idx)
                                                    (zerop idx))
                                               (progn
                                                 (message "Warning: Entry %s may be a duplicate of %s!"
                                                          entry-name current)
                                                 (ding t))))
                                         (throw 'done t))))
                                  ((string-equal previous current)
                                   (error "Duplicate here with previous!"))
                                  (t (error "Entries out of order here!")))))))
        (end-of-bibtex-entry))))

(defun validate-bibtex-buffer ()
  "Find some typical errors in bibtex files.
  1. At signs (@) not as first char of a line.
  2. Double quotes (\") inside strings.
  3. Closing braces (}) not the last character of a line."
  (interactive)
  (let ((point (point)))
    (while (re-search-forward ".@" nil t)
      (let* ((foo (parse-partial-sexp (save-excursion (beginning-of-bibtex-entry)
                                                      (point))
                                      (point)))
             (in-a-string (nth 3 foo)))
        (if (not in-a-string)
            (error "At sign (@) out of place!"))))
    (goto-char point)
    (while (search-forward "\"" nil t)
      (or (looking-at "[,}][ \t]*$")
          ;; some versions put closing brace on separate line.
          (looking-at "[ \t]*\n}")
          (save-excursion
            (save-restriction
              (narrow-to-region (point)
                                (progn (beginning-of-line) (point)))
              (looking-at "^[ \t]*[a-zA-Z]+[ \t]*=[ \t]*\"$")))
          (error "Quote out of place, or missing \",\" or \"}\"!")))
    (goto-char point)
    ;; This is only approximate, should actually search for close braces,
    ;; then see if they are inside a string, or at the end of a line.
    ;; This just gets the typical case of whitespace after a closing brace.
    (while (search-forward "}[ \t]+$" nil t)
      (error "Brace not last char of line!"))
    (goto-char point)
    (message "Bibtex buffer appears o.k.")))

(defun find-bibtex-duplicates ()
  "Searches forward in current buffer looking for duplicate bibtex entries.
Buffer is assumed to be sorted, see \\[sort-bibtex-entries]"
  (interactive)
  (let ((point (point)))
    ;; errors if things are not right...
    (find-bibtex-entry-location (make-string 10 255))
    (goto-char point)
    (message "No duplicates found!")))


(defvar bibtex-maintain-sorted-entries nil
  "*If true, bibtex-mode will attempt to maintain all bibtex entries in 
sorted order.")

;;
;; note: this should really take lists of strings OR of lists.  in the
;;       second case, one can use either list.  (ie:
;;                "name" (("crossref") ("journal" "year"))     )
;;

(defun bibtex-entry (entry-type required optional)
  (let (key)
    (if bibtex-maintain-sorted-entries
        (progn
          (setq key (read-string (format "%s key: " entry-type)))
          (find-bibtex-entry-location key)))
    (bibtex-move-outside-of-entry)
    (insert "@" entry-type "{")
    (mapcar 'bibtex-make-field required)
    (if bibtex-include-OPTcrossref
        (bibtex-make-optional-field "crossref"))
    (if bibtex-include-OPTkey
        (bibtex-make-optional-field "key"))
    (mapcar 'bibtex-make-optional-field optional)
    (if bibtex-mode-user-optional-fields ;MON...
        (mapcar 'bibtex-make-optional-field 
                bibtex-mode-user-optional-fields))
    (if bibtex-include-OPTannote
        (bibtex-make-optional-field "annote"))
    (insert "\n}\n\n")
    (forward-char -3)
    (up-list -1)
    (forward-char 1)
    (if key
        (progn
          (insert key)
          (bibtex-next-field t)))))

;; (defun bibtex-entry (entry-type required optional)
;;   (bibtex-move-outside-of-entry)
;;   (insert (concat "@" entry-type "{,\n\n}\n\n"))
;;   (previous-line 3)
;;   (insert (mapconcat 'bibtex-make-entry required ",\n"))
;;   (if required
;;       (if optional
;;        (insert ",\n")))
;;   (insert (mapconcat 'bibtex-make-OPT-entry optional ",\n"))
;;   (if bibtex-mode-user-optional-fields               ;MON...
;;       (progn
;;      (if optional
;;          (insert ",\n"))
;;      (insert (mapconcat 'bibtex-make-OPT-entry
;;                         bibtex-mode-user-optional-fields
;;                         ",\n"))))            ;MON
;;  (up-list -1)
;;  (forward-char 1))


(defun bibtex-make-field (str)
  (interactive "sBibTeX entry type: ")
  (insert ",\n")
  (indent-to-column bibtex-name-alignement)
  (insert str " = ")
  (indent-to-column bibtex-text-alignment)
  (insert "\"\"")
  nil)

(defun bibtex-make-optional-field (str)
  (interactive "sOptional BibTeX entry type: ")
  (insert ",\n")
  (indent-to-column bibtex-name-alignement)
  (insert "OPT" str " = ")
  (indent-to-column bibtex-text-alignment)
  (insert "\"\"")
  nil)

;; What to do about crossref?  if present, journal and year are 
;; both optional.  Due to this, i move all of them into optional. -- MON

(defun bibtex-Article ()
  (interactive)
  (if bibtex-include-OPTcrossref
      (bibtex-entry "Article" '("author" "title")
                    '("journal" "year" "volume" "number" "pages"
                      "month" "note"))
    (bibtex-entry "Article" '("author" "title" "journal" "year")
                  '("volume" "number" "pages" "month" "note"))))


(defun bibtex-Book ()
  (interactive)
  (bibtex-entry "Book" '("author" "title" "publisher" "year")
                '("editor" "volume" "number" "series" "address"
                           "edition" "month" "note")))

(defun bibtex-Booklet ()
  (interactive)
  (bibtex-entry "Booklet" '("title")
                '("author" "howpublished" "address" "month" "year" "note")))

;; France: Dipl\^{o}me d'Etudes Approfondies (similar to Master's)
(defun bibtex-DEAthesis ()
  (interactive)
  (bibtex-entry "DEAthesis" '("author" "title" "school" "year")
                '("address" "month" "note")))

(defun bibtex-InBook ()
  (interactive)
  (if bibtex-include-OPTcrossref
      (bibtex-entry "InBook" '("author" "title" "chapter")
                    '("publisher" "year" "editor" "pages" "volume" "number"
                      "series" "address" "edition" "month" "type" "note"))
    (bibtex-entry "InBook" '("author" "title" "chapter" "publisher" "year")
                  '("editor" "pages" "volume" "number" "series" "address"
                    "edition" "month" "type" "note"))))

(defun bibtex-InCollection ()
  (interactive)
  (if bibtex-include-OPTcrossref
      (bibtex-entry "InCollection" '("author" "title")
                    '("booktitle" "publisher" "year"
                      "editor" "volume" "number" "series" "type" "chapter"
                      "pages" "address" "edition" "month" "note"))
    (bibtex-entry "InCollection" '("author" "title"
                                   "booktitle" "publisher" "year")
                  '("editor" "volume" "number" "series" "type" "chapter"
                    "pages" "address" "edition" "month" "note"))))


(defun bibtex-InProceedings ()
  (interactive)
  (if bibtex-include-OPTcrossref
      (bibtex-entry "InProceedings" '("author" "title")
                    '("editor" "volume" "number" "series" "pages"
                      "booktitle" "year"
                      "organization" "publisher" "address" "month" "note"))
    (bibtex-entry "InProceedings" '("author" "title" "booktitle" "year")
                  '("editor" "volume" "number" "series" "pages"
                    "organization" "publisher" "address" "month" "note"))))


(defun bibtex-Manual ()
  (interactive)
  (bibtex-entry "Manual" '("title")
                '("author" "organization" "address" "edition" "year"
                           "month" "note")))

(defun bibtex-MastersThesis ()
  (interactive)
  (bibtex-entry "MastersThesis" '("author" "title" "school" "year")
                '("address" "month" "note" "type")))

(defun bibtex-Misc ()
  (interactive)
  (bibtex-entry "Misc" '()
                '("author" "title" "howpublished" "year" "month" "note")))

(defun bibtex-PhdThesis ()
  (interactive)
  (bibtex-entry "PhdThesis" '("author" "title" "school" "year")
                '("address" "month" "type" "note")))

(defun bibtex-Proceedings ()
  (interactive)
  (bibtex-entry "Proceedings" '("title" "year")
                '("editor" "volume" "number" "series" "publisher"
                  "organization" "address" "month" "note")))

(defun bibtex-TechReport ()
  (interactive)
  (bibtex-entry "TechReport" '("author" "title" "institution" "year")
                '("type" "number" "address" "month" "note")))

(defun bibtex-Unpublished ()
  (interactive)
  (bibtex-entry "Unpublished" '("author" "title" "note")
                '("year" "month")))

(defun bibtex-string ()
  (interactive)
  (bibtex-move-outside-of-entry)
  (insert "@string{ = """"}\n")
  (previous-line 1)
  (forward-char 8))

(defun bibtex-preamble ()
  (interactive)
  (bibtex-move-outside-of-entry)
  (insert "@Preamble{}\n")
  (previous-line 1)
  (forward-char 10))
\f
(defun bibtex-next-field (arg)
  "Finds end of text of next BibTeX field; with arg, to its beginning"
  (interactive "P")
  (bibtex-inside-field)
  (let ((start (point)))
    (condition-case ()
        (progn
          (bibtex-enclosing-field)
          (goto-char (match-end 0))
          (forward-char 2))
      (error
       (goto-char start)
       (end-of-line)
       (forward-char 1))))
  (bibtex-find-text arg))

;; (defun bibtex-next-field ()
;;   "Finds end of text of next field."
;;   (interactive)
;;   (condition-case ()
;;       (progn
;;      (bibtex-inside-field)
;;      (re-search-forward ",[ \t\n]*" (point-max) 1)
;;      (bibtex-enclosing-field)
;;      (bibtex-inside-field))
;;     (error nil)))

(defun bibtex-find-text (arg)
  "Go to end of text of current field; with arg, go to beginning."
  (interactive "P")
  (bibtex-inside-field)
  (bibtex-enclosing-field)
  (if arg
      (progn
        (goto-char (match-beginning bibtex-text-in-field))
        (if (looking-at "\"")
            (forward-char 1)))
    (goto-char (match-end bibtex-text-in-field))
    (if (= (preceding-char) ?\")
        (forward-char -1))))

;; (defun bibtex-find-text ()
;;   "Go to end of text of current field."
;;   (interactive)
;;   (condition-case ()
;;       (progn
;;      (bibtex-inside-field)
;;      (bibtex-enclosing-field)
;;      (goto-char (match-end bibtex-text-in-field))
;;      (bibtex-inside-field))
;;     (error nil)))

(defun bibtex-remove-OPT ()
  "Removes the 'OPT' starting optional arguments and goes to end of text"
  (interactive)
  (bibtex-inside-field)
  (bibtex-enclosing-field)
  (save-excursion
    (goto-char (match-beginning bibtex-name-in-field))
    (if (looking-at "OPT")
        (delete-char (length "OPT"))))
  (bibtex-inside-field))

(defun bibtex-inside-field ()
  "Try to avoid point being at end of a bibtex field."
  (interactive)
  (end-of-line)
  (skip-chars-backward " \t")           ;MON - maybe delete these chars?
  (cond ((= (preceding-char) ?,)
         (forward-char -1)))
  (cond ((= (preceding-char) ?\")
         (forward-char -1))))           ;MON - only go back if quote

(defun bibtex-remove-double-quotes ()
  "Removes """" around string."
  (interactive)
  (save-excursion
    (bibtex-inside-field)
    (bibtex-enclosing-field)
    (let ((start (match-beginning bibtex-text-in-field))
          (stop (match-end  bibtex-text-in-field)))
      (goto-char stop)
      (forward-char -1)
      (if (looking-at "\"")
          (delete-char 1))
      (goto-char start)
      (if (looking-at "\"")
          (delete-char 1)))))

(defun bibtex-kill-optional-field ()
  "Kill the entire enclosing optional BibTeX field"
  (interactive)
  (bibtex-inside-field)
  (bibtex-enclosing-field)
  (goto-char (match-beginning bibtex-name-in-field))
  (let ((the-end (match-end 0))
        (the-beginning (match-beginning 0)))
    (if (looking-at "OPT")
        (progn
          (goto-char the-end)
          (skip-chars-forward " \t\n,")
          (kill-region the-beginning the-end))
      (error "Mandatory fields can't be killed"))))

(defun bibtex-empty-field ()
  "Delete the text part of the current field, replace with empty text"
  (interactive)
  (bibtex-inside-field)
  (bibtex-enclosing-field)
  (goto-char (match-beginning bibtex-text-in-field))
  (kill-region (point) (match-end bibtex-text-in-field))
  (insert "\"\"")
  (bibtex-find-text t))

\f
(defun bibtex-pop-previous (arg)
  "Replace text of current field with the text of similar field in previous entry.
With arg, go up ARG entries.  Repeated, goes up so many times.  May be
intermixed with \\[bibtex-pop-next] (bibtex-pop-next)."
  (interactive "p")
  (bibtex-inside-field)
  (save-excursion
    ; parse current field
    (bibtex-enclosing-field)
    (let ((start-old-text (match-beginning bibtex-text-in-field))
          (stop-old-text  (match-end bibtex-text-in-field))
          (start-name (match-beginning bibtex-name-in-field))
          (stop-name (match-end bibtex-name-in-field))
          (new-text))
      (goto-char start-name)
      ; construct regexp for previous field with same name as this one
      (let ((matching-entry
             (bibtex-cfield
              (buffer-substring (if (looking-at "OPT")
                                    (+ (point) (length "OPT"))
                                  (point))
                                stop-name)
              bibtex-field-text)))
        
        ; if executed several times in a row, start each search where the
        ; last one finished
        (cond ((or (eq last-command 'bibtex-pop-previous)
                   (eq last-command 'bibtex-pop-next))
               t
               )
              (t
               (bibtex-enclosing-reference)
               (setq bibtex-pop-previous-search-point (match-beginning 0))
               (setq bibtex-pop-next-search-point (match-end 0))))
        (goto-char bibtex-pop-previous-search-point)
        
        ; Now search for arg'th previous similar field
        (cond
         ((re-search-backward matching-entry (point-min) t arg)
          (setq new-text
                (buffer-substring (match-beginning bibtex-text-in-cfield)
                                  (match-end bibtex-text-in-cfield)))
          ; Found a matching field. Remember boundaries.
          (setq bibtex-pop-next-search-point (match-end 0))
          (setq bibtex-pop-previous-search-point (match-beginning 0))
          (bibtex-flash-head)
          ; Go back to where we started, delete old text, and pop new.
          (goto-char stop-old-text)
          (delete-region start-old-text stop-old-text)
          (insert new-text))
         (t                             ; search failed
          (error "No previous matching BibTeX field."))))))
  (setq this-command 'bibtex-pop-previous))

(defun bibtex-pop-next (arg)
  "Replace text of current field with the text of similar field in next entry.
With arg, go up ARG entries.  Repeated, goes up so many times.  May be
intermixed with \\[bibtex-pop-previous] (bibtex-pop-previous)."
  (interactive "p")
  (bibtex-inside-field)
  (save-excursion
    ; parse current field
    (bibtex-enclosing-field)
    (let ((start-old-text (match-beginning bibtex-text-in-field))
          (stop-old-text  (match-end bibtex-text-in-field))
          (start-name (match-beginning bibtex-name-in-field))
          (stop-name (match-end bibtex-name-in-field))
          (new-text))
      (goto-char start-name)
      ; construct regexp for next field with same name as this one,
      ; ignoring possible OPT's
      (let ((matching-entry
             (bibtex-cfield
              (buffer-substring (if (looking-at "OPT")
                                    (+ (point) (length "OPT"))
                                  (point))
                                stop-name)
              bibtex-field-text)))
        
        ; if executed several times in a row, start each search where the
        ; last one finished
        (cond ((or (eq last-command 'bibtex-pop-next)
                   (eq last-command 'bibtex-pop-previous))
               t
               )
              (t
               (bibtex-enclosing-reference)
               (setq bibtex-pop-previous-search-point (match-beginning 0))
               (setq bibtex-pop-next-search-point (match-end 0))))
        (goto-char bibtex-pop-next-search-point)
        
        ; Now search for arg'th next similar field
        (cond
         ((re-search-forward matching-entry (point-max) t arg)
          (setq new-text
                (buffer-substring (match-beginning bibtex-text-in-cfield)
                                  (match-end bibtex-text-in-cfield)))
          ; Found a matching field. Remember boundaries.
          (setq bibtex-pop-next-search-point (match-end 0))
          (setq bibtex-pop-previous-search-point (match-beginning 0))
          (bibtex-flash-head)
          ; Go back to where we started, delete old text, and pop new.
          (goto-char stop-old-text)
          (delete-region start-old-text stop-old-text)
          (insert new-text))
         (t                             ; search failed
          (error "No next matching BibTeX field."))))))
  (setq this-command 'bibtex-pop-next))

(defun bibtex-flash-head ()
  "Flash at BibTeX reference head before point, if exists.  (Moves point)."
  (let ((flash))
    (cond ((re-search-backward bibtex-reference-head (point-min) t)
           (goto-char (match-beginning bibtex-type-in-head))
           (setq flash (match-end bibtex-key-in-reference)))
          (t
           (end-of-line)
           (skip-chars-backward " \t")
           (setq flash (point))
           (beginning-of-line)
           (skip-chars-forward " \t")))
    (if (pos-visible-in-window-p (point))
        (sit-for 1)
      (message "From: %s"
               (buffer-substring (point) flash)))))


\f
(defun bibtex-enclosing-field ()
  "Search for BibTeX field enclosing point.
Point moves to end of field; also, use match-beginning and match-end
to parse the field."
  (condition-case errname
      (bibtex-enclosing-regexp bibtex-field)
    (search-failed
     (error "Can't find enclosing BibTeX field."))))

(defun bibtex-enclosing-reference ()
  "Search for BibTeX reference enclosing point.
Point moves to end of reference; also, use match-beginning and match-end
to parse the reference."
  (condition-case errname
      (bibtex-enclosing-regexp bibtex-reference)
    (search-failed
     (error "Can't find enclosing BibTeX reference."))))

(defun bibtex-enclosing-regexp (regexp)
  "Search for REGEXP enclosing point.
Point moves to end of REGEXP.  See also match-beginning and match-end.
If an enclosing REGEXP is not found, signals search-failed; point is left in
an undefined location.

[Doesn't something like this exist already?]"
  
  (interactive "sRegexp: ")
  ; compute reasonable limits for the loop
  (let* ((initial (point))
         (right (if (re-search-forward regexp (point-max) t)
                    (match-end 0)
                  (point-max)))
         (left
          (progn
            (goto-char initial)
            (if (re-search-backward regexp (point-min) t)
                (match-beginning 0)
              (point-min)))))
    ; within the prescribed limits, loop until a match is found
    (goto-char left)
    (re-search-forward regexp right nil 1)
    (if (> (match-beginning 0) initial)
        (signal 'search-failed (list regexp)))    
    (while (<= (match-end 0) initial)
      (re-search-forward regexp right nil 1)
      (if (> (match-beginning 0) initial)
          (signal 'search-failed (list regexp))))
    ))

(defun bibtex-clean-entry ()
  "For all optional fields of current BibTeX entry: if empty, kill the whole field; otherwise, remove the \"OPT\" string in the name; if text numerical, remove double-quotes.  For all mandatory fields: if empty, signal error."
  (interactive)
  (bibtex-enclosing-reference)
  (goto-char (match-beginning 0))
  (let ((start (point)))
    (save-restriction
      (narrow-to-region start (match-end 0))
      (while (re-search-forward bibtex-field (point-max) t 1)
        (let ((begin-field (match-beginning 0))
              (end-field (match-end 0))
              (begin-name (match-beginning bibtex-name-in-field))
              (end-name (match-end  bibtex-name-in-field))
              (begin-text (match-beginning bibtex-text-in-field))
              (end-text (match-end bibtex-text-in-field))
              )
          (goto-char begin-name)
          (cond ((and
                  (looking-at "OPT")
                  bibtex-clean-entry-zap-empty-opts)
                 (goto-char begin-text)
                 (if (looking-at "\"\"") ; empty: delete whole field
                     (delete-region begin-field end-field)
                   ; otherwise: not empty, delete "OPT"
                   (goto-char begin-name)
                   (delete-char (length "OPT"))
                   (goto-char begin-field) ; and loop to go through next test
                   ))
                (t
                 (goto-char begin-text)
                 (cond ((looking-at "\"[0-9]+\"") ; if numerical,
                        (goto-char end-text)
                        (delete-char -1) ; delete enclosing double-quotes
                        (goto-char begin-text)
                        (delete-char 1)
                        (goto-char end-field) ; go to end for next search
                        (forward-char -2) ; to compensate for the 2 quotes deleted
                        )
                       ((looking-at "\"\"") ; if empty quotes, complain
                        (forward-char 1)
                        (if (not (or (equal (buffer-substring
                                             begin-name
                                             (+ begin-name 3))
                                            "OPT")
                                     (equal (buffer-substring
                                             begin-name
                                             (+ begin-name 3))
                                            "opt")))
                            (error "Mandatory field ``%s'' is empty"
                                   (buffer-substring begin-name end-name))))
                       (t
                        (goto-char end-field))))))))
    (goto-char start)
    (skip-chars-forward "@a-zA-Z")
    (bibtex-enclosing-reference)
    (goto-char (match-end 0))
    (skip-chars-forward " \t\n\f")))

\f

;;; X window menus for bibtex mode

(defun bibtex-x-help (arg)
  "Mouse commands for BibTeX mode"
  
  (let ((selection
         (x-popup-menu
          arg
          '("BibTeX commands"
            ("BibTeX entry types"
             (" article in conference Proceedings " . bibtex-InProceedings)
             ("        Article in journal         " . bibtex-Article)
             ("               Book                " . bibtex-Book)
             ("             Booklet               " . bibtex-Booklet)
             ("            Conference             " . bibtex-InProceedings)
             ("         Master's Thesis           " . bibtex-MastersThesis)
             ("            DEA Thesis             " . bibtex-DEAthesis)
             ("            Phd. Thesis            " . bibtex-PhdThesis)
             ("         Technical Report          " . bibtex-TechReport)
             ("         technical Manual          " . bibtex-Manual)
             ("      conference Proceedings       " . bibtex-Proceedings)
             ("        a chapter in a Book        " . bibtex-InBook)
             ("    an article in a Collection     " . bibtex-InCollection)
             ("           miscellaneous           " . bibtex-Misc)
             ("            unpublished            " . bibtex-Unpublished)
             ("              string               " . bibtex-string)
             ("             preamble              " . bibtex-preamble)
             )
            ("Moving around and editing"
             ("            next field             " . bibtex-next-field)
             ("          to end of field          " . bibtex-find-text)
             ("snatch from similar preceding field" . bibtex-pop-previous)
             ("snatch from similar following field" . bibtex-pop-next)
             ("            remove OPT             " . bibtex-remove-OPT)
             ("           remove quotes           "
              . bibtex-remove-double-quotes)
             ("          clean up entry           " . bibtex-clean-entry)
             )
            ("help"
             ("       describe BibTeX mode        " . describe-mode)
             )))))
    (and selection (call-interactively selection))))

(defun bibtex-x-environment ()
  "Set up X menus for BibTeX mode.  Call it as bibtex-mode-hook, or interactively"
  (interactive)
  (require 'x-mouse)
  (define-key mouse-map x-button-c-right 'bibtex-x-help)
  )

\f

;; Please don't send anything to bug-gnu-emacs about these Sunwindows functions
;; since we aren't interested.  See etc/SUN-SUPPORT for the reasons why
;; we consider this nothing but a distraction from our work.

(defmacro eval-in-menu-window (&rest l)
  "Evaluates its argument in the window in which the mouse button was pressed."
  (list 'eval-in-window '*menu-window* l))

;(defmenu bibtex-sun-entry-menu 
;  ("Article In Conf. Proc." eval-in-menu-window bibtex-InProceedings)
;  ("Article In Journal" eval-in-menu-window bibtex-Article)
;  ("Book" eval-in-menu-window bibtex-Book)
;  ("Booklet" eval-in-menu-window bibtex-Booklet)
;  ("Master's Thesis" eval-in-menu-window bibtex-MastersThesis)
;  ("PhD. Thesis" eval-in-menu-window bibtex-PhdThesis)
;  ("Technical Report" eval-in-menu-window bibtex-TechReport)
;  ("Technical Manual" eval-in-menu-window bibtex-Manual)
;  ("Conference Proceedings" eval-in-menu-window bibtex-Proceedings)
;  ("In A Book" eval-in-menu-window bibtex-InBook)
;  ("In A Collection" eval-in-menu-window bibtex-InCollection)
;  ("Miscellaneous" eval-in-menu-window bibtex-Misc)
;  ("Unpublished" eval-in-menu-window bibtex-Unpublished)
;  ("string" eval-in-menu-window bibtex-string)
;  ("preamble" eval-in-menu-window bibtex-preamble))
;
;(defmenu bibtex-sun-menu
;  ("BibTeX menu")
;  ("add entry" . bibtex-sun-entry-menu)
;  ("next field" eval-in-menu-window bibtex-next-field nil)
;  ("to end of field" eval-in-menu-window bibtex-find-text nil)
;  ("snatch similar preceding field" eval-in-menu-window bibtex-pop-previous 1)
;  ("snatch similar following field" eval-in-menu-window bibtex-pop-next 1)
;  ("remove OPT" eval-in-menu-window bibtex-remove-OPT)
;  ("remove quotes" eval-in-menu-window bibtex-remove-double-quotes)
;  ("clean entry" eval-in-menu-window bibtex-clean-entry)
;  ("describe BibTeX mode" eval-in-menu-window describe-mode)
;  ("Main Emacs menu" . emacs-menu))
 
(defun bibtex-sun-menu-eval (window x y)
  "Pop-up menu of BibTeX commands."
  (sun-menu-evaluate window (1+ x) (1- y) 'bibtex-sun-menu))

(defun bibtex-sun-environment ()
  "Set up sun menus for BibTeX mode.  Call it as bibtex-mode-hook, or
interactively"
  (interactive)
  (local-set-mouse  '(text right) 'bibtex-sun-menu-eval))

;;; bibtex-mode.el ends here