(inferior-octave-prompt): Also match prompts of the form

[bpt/emacs.git] / lisp / textmodes / reftex.el

;;; reftex.el --- Minor mode for doing \label, \ref and \cite in LaTeX
;; Copyright (c) 1997, 1998 Free Software Foundation, Inc.

;; Author:     Carsten Dominik <dominik@strw.LeidenUniv.nl>
;; Keywords:   tex

;; 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 2, 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;---------------------------------------------------------------------------
;;
;;; Commentary:
;;
;; RefTeX is a minor mode with distinct support for \ref, \label and
;; \cite commands in (multi-file) LaTeX documents.
;; Labels are created semi-automatically.  Definition context of labels is
;; provided when creating a reference.  Citations are simplified with
;; efficient database lookup.  A table of contents buffer provides easy
;; access to any part of a document.
;;
;;
;; INSTALLATION
;; ------------
;;
;; If you got reftex.el with an Emacs distribution, it is already
;; installed.  If not, follow the instructions in the INSTALL file of
;; the distribution.
;;
;; To turn RefTeX Mode on and off in a particular buffer, use
;; `M-x reftex-mode'.
;;
;; To turn on RefTeX Mode for all LaTeX files, add one of the following
;; lines to your .emacs file:
;;
;;   (add-hook 'LaTeX-mode-hook 'turn-on-reftex)   ; with AUCTeX LaTeX mode
;;   (add-hook 'latex-mode-hook 'turn-on-reftex)   ; with Emacs latex mode
;;
;;
;; DOCUMENTATION
;; -------------
;;
;; See below for a short summary of how to use RefTeX.
;;
;; There is an extensive texinfo document describing RefTeX in detail.
;; When you are getting reftex.el with the Emacs distribution, the
;; info files should already be installed.  To view this
;; documentation, use `M-x reftex-info RET'.
;;
;; The documentation in various formats is also available at
;;
;;     http://www.strw.leidenuniv.nl/~dominik/Tools/
;;
;;---------------------------------------------------------------------------
;; 
;; RefTeX in a Nutshell
;; ====================
;; 
;;  1. Labels and References
;;     RefTeX distinguishes labels for different environments.  It knows
;;     about all standard environments (and many others), and can be
;;     configured to recognize any additional labeled environments you
;;     have defined yourself (variable REFTEX-LABEL-ALIST).
;;
;;        * Creating Labels
;;          Type `C-c (' (`reftex-label') to insert a label at point.
;;          RefTeX will either
;;             - derive a label from context (default for section labels)
;;             - prompt for a label string (default for figures and
;;               tables) or
;;             - insert a simple label made of a prefix and a number (all
;;               other environments).
;;          Which labels are created how is configurable (variable
;;          REFTEX-INSERT-LABEL-FLAGS).
;;
;;        * Referencing Labels
;;          In order to make a reference, type `C-c )'
;;          (`reftex-reference').  This shows an outline of the document
;;          with all labels of a certain type (figure, equation,...) and
;;          context of the label definition.  Selecting a label inserts a
;;          `\ref{LABEL}' macro into the original buffer.
;;
;;  2. Citations
;;     After typing `C-c [' (`reftex-citation'), RefTeX will let you
;;     specify a regular expression to search in current BibTeX database
;;     files (as specified in the `\bibliography' command) and pull out a
;;     list of matches for you to choose from.  The list is *formatted*
;;     and sorted.  The selected article is referenced as `\cite{KEY}'
;;     (customizable with variable REFTEX-CITE-FORMAT).
;;
;;  3. Viewing Cross References
;;     When no other message occupies the echo area and point is idle on
;;     the argument of a `\ref' or `\cite' macro, the echo area will
;;     display information about the citation/cross reference.
;;     With point on the argument of such a macro, press `C-c &'
;;     (`reftex-view-crossref'), or click with `S-mouse-2' on the macro
;;     argument.  This will display the corresponding label definition or
;;     BibTeX database entry in another window.
;;
;;  4. Table of Contents
;;     Typing `C-c =' (`reftex-toc') will show a table of contents of the
;;     document.  From that buffer, you can jump quickly to every part of
;;     your document.
;;
;;  5. Multifile Documents
;;     Multifile Documents are fully supported. RefTeX will provide cross
;;     referencing information from all files which are part of the
;;     document, and even across document borders (`xr.sty').
;;
;;  6. Document Parsing
;;     RefTeX needs to parse the document in order to find labels and
;;     other information.  It does it automatically once, when you start
;;     working with a document.  RefTeX updates its lists internally when
;;     you make a new label with `reftex-label'.  To enforce reparsing,
;;     call any of the commands described above with a raw `C-u' prefix,
;;     or press the `r' key in the label selection buffer or the table of
;;     contents buffer.
;;
;;  7. Useful Settings
;;     To make RefTeX faster for large documents include, and to integrate 
;;     it with AUCTeX, try these:
;;
;;          (setq reftex-enable-partial-scans t)
;;          (setq reftex-save-parse-info t)
;;          (setq reftex-use-multiple-selection-buffers t)
;;          (setq reftex-plug-into-AUCTeX t)
;;
;;---------------------------------------------------------------------------
;;
;; AUTHOR
;; ======
;;
;; Carsten Dominik <dominik@strw.LeidenUniv.nl>
;;
;;         with contributions from Stephen Eglen
;;
;; The newest version of RefTeX can be found at
;;
;;    http://www.strw.leidenuniv.nl/~dominik/Tools/
;;    ftp://ftp.strw.leidenuniv.nl/pub/dominik/
;;
;; At that site you can also get version 3.22 of RefTeX which is still
;; compatible with Emacs 19.  The file you are reading now as well as the
;; ones distributed with Emacs 20 are not.
;;
;; THANKS TO:
;; ---------
;; Thanks to the people on the Net who have used RefTeX and helped
;; developing it with their reports.  In particular thanks to
;;
;;    F. Burstall, Alastair Burt, Soren Dayton, Stephen Eglen,
;;    Karl Eichwalder, Peter Galbraith, Dieter Kraft, Adrian Lanz,
;;    Rory Molinari, Laurent Mugnier, Sudeep Kumar Palat, Daniel Polani,
;;    Robin Socha, Richard Stanton, Allan Strand, Jan Vroonhof,
;;    Christoph Wedler, Alan Williams.
;;
;; Finally thanks to Uwe Bolick who first got me (some years ago) into
;; supporting LaTeX labels and references with an Editor (which was
;; MicroEmacs at the time).
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;;;;;
\f
;;; Code:

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

;; Stuff that needs to be there when we use defcustom
(require 'custom)

(defvar reftex-tables-dirty t
  "Flag showing if tables need to be re-computed.")

(eval-and-compile
  (defun reftex-set-dirty (symbol value)
    (setq reftex-tables-dirty t)
    (set symbol value)))

;;; ======================================================================
;;;
;;; Configuration Section

;; Define the two constants which are needed during compilation

(eval-and-compile
(defconst reftex-label-alist-builtin
  '(
    ;; Some aliases, mostly for backward compatibility
    (Sideways    "Alias for -->rotating" (rotating))
    (AMSTeX      "amsmath with eqref macro"
                 ((nil ?e nil "~\\eqref{%s}")
                  amsmath))

    ;; Individual package defaults
    (amsmath "AMS-LaTeX math environments"
     (("align"        ?e nil nil eqnarray-like)
      ("gather"       ?e nil nil eqnarray-like)
      ("multline"     ?e nil nil t)
      ("flalign"      ?e nil nil eqnarray-like)
      ("alignat"      ?e nil nil alignat-like)
      ("xalignat"     ?e nil nil alignat-like)
      ("xxalignat"    ?e nil nil alignat-like)
      ("subequations" ?e nil nil t)))

    (endnotes "The \\endnote macro"
     (("\\endnote[]{}" ?n nil nil 2 (regexp "Endnotes?"))))

    (fancybox "The Beqnarray environment"
     (("Beqnarray" ?e nil nil eqnarray-like)))

    (floatfig "The floatingfigure environment"
     (("floatingfigure" ?f nil nil caption)))

    (longtable   "The longtable environment"
     (("longtable"  ?t nil nil caption)))

    (picinpar    "The figwindow and tabwindow environments"
     (("figwindow" ?f nil nil 1)
      ("tabwindow" ?f nil nil 1)))

    (rotating    "Sidewaysfigure and table"
     (("sidewaysfigure" ?f nil nil caption)
      ("sidewaystable"  ?t nil nil caption)))

    (sidecap      "CSfigure and SCtable"
     (("SCfigure"       ?f nil nil caption)
      ("SCtable"        ?t nil nil caption)))

    (subfigure   "Subfigure environments/macro"
     (("subfigure"   ?f nil nil caption)
      ("subfigure*"  ?f nil nil caption)
      ("\\subfigure[]{}" ?f nil nil 1)))

    (supertab    "Supertabular environment"
     (("supertabular" ?t nil nil "\\tablecaption{")))

    (wrapfig     "The wrapfigure environment"
     (("wrapfigure" ?f nil nil caption)))

    ;; The LaTeX core stuff
    (LaTeX       "LaTeX default environments"
     (("section"   ?s "sec:" "~\\ref{%s}" (nil . t)
       (regexp "parts?" "chapters?" "chap\\." "sections?" "sect?\\."
               "paragraphs?" "par\\."
               "\\\\S" "\247" "Teile?" "Kapitel" "Kap\\." "Abschnitte?"
               "appendi\\(x\\|ces\\)" "App\\."  "Anh\"?ange?" "Anh\\."))

      ("enumerate" ?i "item:" "~\\ref{%s}" item
       (regexp "items?" "Punkte?"))
      
      ("equation"  ?e "eq:" "~(\\ref{%s})" t
       (regexp "equations?" "eqs?\\." "eqn\\." "Gleichung\\(en\\)?"  "Gl\\."))
      ("eqnarray"  ?e "eq:" nil eqnarray-like)
      
      ("figure"    ?f "fig:" "~\\ref{%s}" caption
       (regexp "figure?[sn]?" "figs?\\." "Abbildung\\(en\\)?" "Abb\\."))
      ("figure*"   ?f nil nil caption)
      
      ("table"     ?t "tab:" "~\\ref{%s}" caption
       (regexp "tables?" "tab\\." "Tabellen?"))
      ("table*"    ?t nil nil caption)
      
      ("\\footnote[]{}" ?n "note:" "~\\ref{%s}" 2
       (regexp "footnotes?" "notes?" "Anmerkung\\(en\\)?" "Anm\\."))
      
      ("any"       ?\  " "   "~\\ref{%s}" nil)

      ;; The label macro is hard coded, but it *could* be defined like this:
      ;;("\\label{*}" nil nil nil nil)
      ))

    )
  "The default label environment descriptions.
Lower-case symbols correspond to a style file of the same name in the LaTeX
distribution.  Mixed-case symbols are convenience aliases.")

(defconst reftex-cite-format-builtin
  '(
    (default "Default macro \\cite{%l}"
      "\\cite{%l}")
    (natbib "The Natbib package"
     ((?\C-m . "\\cite{%l}")
      (?t    . "\\citet{%l}")
      (?T    . "\\citet*{%l}")
      (?p    . "\\citep{%l}")
      (?P    . "\\citep*{%l}")
      (?e    . "\\citep[e.g.][]{%l}")
      (?s    . "\\citep[see][]{%l}")
      (?a    . "\\citeauthor{%l}")
      (?A    . "\\citeauthor*{%l}")
      (?y    . "\\citeyear{%l}")))
    (harvard "The Harvard package"
     ((?\C-m . "\\cite{%l}")
      (?p    . "\\cite{%l}")
      (?t    . "\\citeasnoun{%l}")
      (?n    . "\\citeasnoun{%l}")
      (?s    . "\\possessivecite{%l}")
      (?e    . "\\citeaffixed{%l}{?}")
      (?y    . "\\citeyear{%l}")
      (?a    . "\\citename{%l}")))
    (chicago "The Chicago package"
     ((?\C-m . "\\cite{%l}")
      (?t    . "\\citeN{%l}")
      (?T    . "\\shortciteN{%l}")
      (?p    . "\\cite{%l}")
      (?P    . "\\shortcite{%l}")
      (?a    . "\\citeA{%l}")
      (?A    . "\\shortciteA{%l}")
      (?y    . "\\citeyear{%l}")))
    (astron "The Astron package"
     ((?\C-m . "\\cite{%l}")
      (?p    . "\\cite{%l}" )
      (?t    . "%2a (\\cite{%l})")))
    (author-year "Do-it-yourself Author-year"
     ((?\C-m . "\\cite{%l}")
      (?t    . "%2a (%y)\\nocite{%l}")
      (?p    . "(%2a %y\\nocite{%l})")))
    (locally     "Full info in parenthesis"
     "(%2a %y, %j %v, %P, %e: %b, %u, %s %<)")
    )
  "Builtin versions of the citation format.
The following conventions are valid for all alist entries:
`?\C-m' should always point to a straight \\cite{%l} macro.
`?t'    should point to a textual citation (citation as a noun).
`?p'    should point to a parenthetical citation.")
)

;; Configuration Variables and User Options for RefTeX ------------------

(defgroup reftex nil
  "LaTeX label and citation support."
  :tag "RefTeX"
  :link '(url-link :tag "Home Page" 
                   "http://strw.leidenuniv.nl/~dominik/Tools/")
  :link '(emacs-commentary-link :tag "Commentary in reftex.el" "reftex.el")
  :prefix "reftex-"
  :group 'tex)

(defgroup reftex-label-support nil
  "Support for creation, insertion and referencing of labels in LaTeX."
  :group 'reftex)

(defgroup reftex-defining-label-environments nil
  "Definition of environments and macros to do with label."
  :group 'reftex-label-support)

(defcustom reftex-default-label-alist-entries
  '(amsmath endnotes fancybox floatfig longtable picinpar
            rotating sidecap subfigure supertab wrapfig LaTeX)
  "Default label alist specifications.  LaTeX should be the last entry.
This list describes the default label environments RefTeX should always use.
It is probably a mistake to remove the LaTeX symbol from this list.

The options include:
LaTeX      The standard LaTeX environments.
Sideways   The sidewaysfigure and sidewaystable environments.
AMSTeX     The math environments in the AMS-LaTeX amsmath package.

For the full list of options, try

M-x customize-variable RET reftex-default-label-alist-entries RET."
  :group 'reftex-defining-label-environments
  :set   'reftex-set-dirty
  :type `(set
          :indent 4
          :inline t
          :greedy t
          ,@(mapcar
             (function
              (lambda (x)
                (list 'const ':tag (concat (symbol-name (nth 0 x))
                                           ": " (nth 1 x))
                      (nth 0 x))))
             reftex-label-alist-builtin)))

(defcustom reftex-label-alist nil
  "Alist with information on environments for \\label-\\ref use.

This docstring is easier to understand after reading the configuration
examples in `reftex.el'.  Looking at the builtin defaults in the constant
`reftex-label-alist-builtin' may also be instructive.

Set this variable to define additions and changes to the default.  The only
things you MUST NOT change is that `?s' is the type indicator for section
labels, and SPC for the `any' label type.  These are hard-coded at other
places in the code.

Each list entry describes either an environment carrying a counter for use
with \\label and \\ref, or a LaTeX macro defining a label as (or inside)
one of its arguments.  The elements of each list entry are:

0.  Name of the environment (like \"table\") or macro (like \"\\\\myfig\").
    For macros, indicate the macro arguments for best results, as in
    \"\\\\myfig[]{}{}{*}{}\".  Use square brackets for optional arguments,
    a star to mark the label argument, if any.  The macro does not have to
    have a label argument - you could also use \\label{..} inside one of
    its arguments.
    Special names: `section' for section labels, `any' to define a group
    which contains all labels.
    This may also be nil if the entry is only meant to change some settings
    associated with the type indicator character (see below).

1.  Type indicator character, like `?t', must be a printable ASCII character.
    The type indicator is a single character which defines a label type.
    Any label inside the environment or macro is assumed to belong to this
    type.  The same character may occur several times in this list, to cover
    cases in which different environments carry the same label type (like
    `equation' and `eqnarray').
    If the type indicator is nil and the macro has a label argument {*},
    the macro defines neutral labels just like \label.  In this case
    the reminder of this entry is ignored.

2.  Label prefix string, like \"tab:\".
    The prefix is a short string used as the start of a label.  It may be the
    empty string.  The prefix may contain the following `%' escapes:
       %f   Current file name with directory and extension stripped.
       %F   Current file name relative to directory of master file.
       %u   User login name, on systems which support this.

    Example: In a file `intro.tex', \"eq:%f:\" will become \"eq:intro:\").

3.  Format string for reference insert in buffer.  `%s' will be replaced by
    the label.
    When the format starts with `~', the `~' will only be inserted if
    there is not already a whitespace before point.

4.  Indication on how to find the short context.
    - If nil, use the text following the \\label{...} macro.
    - If t, use
       - the section heading for section labels.
       - text following the \\begin{...} statement of environments.
         (not a good choice for environments like eqnarray or enumerate,
         where one has several labels in a single environment).
       - text after the macro name (starting with the first arg) for macros.
    - If an integer, use the nth argument of the macro.  As a special case,
      1000 means to get text after the last macro argument.
    - If a string, use as regexp to search *backward* from the label.  Context
      is then the text following the end of the match.  E.g. putting this to
      \"\\\\\\\\caption[[{]\" will use the caption in a figure or table
      environment.
      \"\\\\\\\\begin{eqnarray}\\\\|\\\\\\\\\\\\\\\\\" works for eqnarrays.
    - If any of `caption', `item', `eqnarray-like', `alignat-like', this
      symbol will internally be translated into an appropriate regexp
      (see also the variable `reftex-default-context-regexps').
    - If a function, call this function with the name of the environment/macro
      as argument.  On call, point will be just after the \\label macro.  The
      function is expected to return a suitable context string.  It should
      throw an exception (error) when failing to find context.
      As an example, here is a function returning the 10 chars following
      the label macro as context:

        (defun my-context-function (env-or-mac)
          (if (> (point-max) (+ 10 (point)))
              (buffer-substring (point) (+ 10 (point)))
            (error \"Buffer too small\")))

    Label context is used in two ways by RefTeX: For display in the label
    menu, and to derive a label string.  If you want to use a different
    method for each of these, specify them as a dotted pair.
    E.g. `(nil . t)' uses the text after the label (nil) for display, and
    text from the default position (t) to derive a label string.  This is
    actually used for section labels.

    Setting the variable `reftex-use-text-after-label-as-context' to t
    overrides the setting here.

5.  List of magic words which identify a reference to be of this type.
    If the word before point is equal to one of these words when calling
    `reftex-reference', the label list offered will be automatically
    restricted to labels of the correct type.
    If the first element of this wordlist is the symbol `regexp', the
    strings are interpreted as regular expressions.  RefTeX will add
    a \"\\\\W\" to the beginning and other stuff to the end of the regexp.

If the type indicator characters of two or more entries are the same, RefTeX
will use
 - the first non-nil format and prefix
 - the magic words of all involved entries.

Any list entry may also be a symbol.  If that has an association in
`reftex-label-alist-builtin', the cddr of that association is spliced into the
list.  However, builtin defaults should normally be set with the variable
`reftex-default-label-alist-entries."
  :group 'reftex-defining-label-environments
  :set 'reftex-set-dirty
  :type
  `(repeat
    (choice :tag "Package or Detailed   "
     :value ("" ?a nil nil nil nil)
     (list :tag "Detailed Entry"
           :value ("" ?a nil nil nil nil)
           (choice    :tag "Environment or \\macro "
                      (const  :tag "Ignore, just use typekey" nil)
                      (string ""))
           (choice    :tag "Type specification    "
                      (const :tag "unspecified, like in \\label" nil)
                      (character :tag "Char  " ?a))
           (choice    :tag "Label prefix string   "
                      (const  :tag "Default" nil)
                      (string :tag "String" "lab:"))
           (choice    :tag "Label reference format"
                      (const  :tag "Default" nil)
                      (string :tag "String" "~\\ref{%s}"))
           (choice    :tag "Context method        "
                      (const  :tag "Default position" t)
                      (const  :tag "After label"      nil)
                      (number :tag "Macro arg nr" 1)
                      (regexp :tag "Regexp" "")
                      (const  :tag "Caption in float" caption)
                      (const  :tag "Item in list" item)
                      (const  :tag "Eqnarray-like" eqnarray-like)
                      (const  :tag "Alignat-like" alignat-like)
                      (symbol :tag "Function" my-func))
           (repeat :tag "Magic words" :extra-offset 2 (string)))
     (choice
      :tag "Package"
      :value AMSTeX
      ,@(mapcar
         (function
          (lambda (x)
            (list 'const ':tag (concat (symbol-name (nth 0 x)))
                  (nth 0 x))))
         reftex-label-alist-builtin)))))

;; LaTeX section commands and level numbers
(defcustom reftex-section-levels
  '(
    ("part"            . 0)
    ("chapter"         . 1)
    ("section"         . 2)
    ("subsection"      . 3)
    ("subsubsection"   . 4)
    ("paragraph"       . 5)
    ("subparagraph"    . 6)
    ("subsubparagraph" . 7)
    )
  "Commands and levels used for defining sections in the document.
The car of each cons cell is the name of the section macro.  The cdr is a
number indicating its level."
  :group 'reftex-defining-label-environments
  :set 'reftex-set-dirty
  :type '(repeat
          (cons (string :tag "sectioning macro" "")
                (number :tag "level           " 0))))

(defcustom reftex-default-context-regexps
  '((caption       . "\\\\\\(rot\\)?caption\\*?[[{]")
    (item          . "\\\\item\\(\\[[^]]*\\]\\)?")
    (eqnarray-like . "\\\\begin{%s}\\|\\\\\\\\")
    (alignat-like  . "\\\\begin{%s}{[0-9]*}\\|\\\\\\\\"))
"Alist with default regular expressions for finding context.
The form (format regexp (regexp-quote environment)) is used to calculate
the final regular expression - so %s will be replaced with the environment
or macro."
  :group 'reftex-defining-label-environments
  :type '(repeat (cons (symbol) (regexp))))
  
(defcustom reftex-use-text-after-label-as-context nil
  "*t means, grab context from directly after the \\label{..} macro.
This is the fastest method for obtaining context of the label definition, but
requires discipline when placing labels.  Setting this variable to t takes
precedence over the individual settings in `reftex-label-alist'.
This variable may be set to t, nil, or a string of label type letters
indicating the label types for which it should be true."
  :group 'reftex-defining-label-environments
  :set 'reftex-set-dirty
  :type '(choice
          (const :tag "on" t) (const :tag "off" nil)
          (string :tag "Selected label types")))

;; Label insertion

(defgroup reftex-making-and-inserting-labels nil
  "Options on how to create new labels."
  :group 'reftex-label-support)

(defcustom reftex-insert-label-flags '("s" "sft")
  "Flags governing label insertion.  First flag DERIVE, second flag PROMPT.

If DERIVE is t, RefTeX will try to derive a sensible label from context.
A section label for example will be derived from the section heading.
The conversion of the context to a legal label is governed by the
specifications given in `reftex-derive-label-parameters'.
If RefTeX fails to derive a label, it will prompt the user.
If DERIVE is nil, the label generated will consist of the prefix and a
unique number, like `eq:23'.

If PROMPT is t, the user will be prompted for a label string.  The prompt will
already contain the prefix, and (if DERIVE is t) a default label derived from
context.  When PROMPT is nil, the default label will be inserted without
query.

So the combination of DERIVE and PROMPT controls label insertion.  Here is a
table describing all four possibilities:

DERIVE   PROMPT      ACTION
-------------------------------------------------------------------------
 nil     nil     Insert simple label, like eq:22 or sec:13.  No query.
 nil     t       Prompt for label.
 t       nil     Derive a label from context and insert without query.
 t       t       Derive a label from context and prompt for confirmation.

Each flag may be set to t, nil, or a string of label type letters
indicating the label types for which it should be true.  The strings work
like character classes.
Thus, the combination may be set differently for each label type.  The
default settings \"s\" and \"sft\" mean: Derive section labels from headings
(with confirmation).  Prompt for figure and table labels.  Use simple labels
without confirmation for everything else.
The available label types are: s (section), f (figure), t (table), i (item),
e (equation), n (footnote), plus any definitions in `reftex-label-alist'."
  :group 'reftex-making-and-inserting-labels
  :type  '(list (choice :tag "Derive label from context"
                         (const  :tag "always" t)
                         (const  :tag "never" nil)
                         (string :tag "selected label types" ""))
                (choice :tag "Prompt for label string  "
                        :entry-format "  %b %v"
                        (const  :tag "always" t)
                        (const  :tag "never" nil)
                        (string :tag "selected label types" ""))))

(defcustom reftex-string-to-label-function 'reftex-string-to-label
  "Function to turn an arbitrary string into a legal label.
RefTeX's default function uses the variable `reftex-derive-label-parameters'."
  :group 'reftex-making-and-inserting-labels
  :type 'symbol)

(defcustom reftex-translate-to-ascii-function 'reftex-latin1-to-ascii
  "Filter function which will process a context string before it is used
to derive a label from it.  The intended application is to convert ISO or
Mule characters into something legal in labels.  The default function
removes the accents from Latin-1 characters.  X-Symbol (>=2.6) sets this
variable to the much more general `x-symbol-translate-to-ascii'."
  :group 'reftex-making-and-inserting-labels
  :type 'symbol)

(defcustom reftex-derive-label-parameters '(3 20 t 1 "-"
         ("the" "on" "in" "off" "a" "for" "by" "of" "and" "is" "to") t)
  "Parameters for converting a string into a label.
NWORDS      Number of words to use.
MAXCHAR     Maximum number of characters in a label string.
ILLEGAL     nil: Throw away any words containing characters illegal in labels.
            t:   Throw away only the illegal characters, not the whole word.
ABBREV      nil: Never abbreviate words.
            t:   Always abbreviate words (see `reftex-abbrev-parameters').
            not t and not nil: Abbreviate words if necessary to shorten
                               label string below MAXCHAR.
SEPARATOR   String separating different words in the label.
IGNOREWORDS List of words which should not be part of labels.
DOWNCASE    t:   Downcase words before using them."
  :group 'reftex-making-and-inserting-labels
  :type  '(list (integer :tag "Number of words            "  3)
                (integer :tag "Maximum label length       " 20)
                (choice  :tag "Illegal characters in words"
                         (const :tag "throw away entire word" nil)
                         (const :tag "throw away single chars" t))
                (choice  :tag "Abbreviate words           "
                         (const :tag "never" nil)
                         (const :tag "always" t)
                         (const :tag "when label is too long" 1))
                (string  :tag "Separator between words    " "-")
                (repeat  :tag "Ignore words"
                         :entry-format "           %i %d %v"
                         (string :tag ""))
                (option (boolean :tag "Downcase words          "))))

(defcustom reftex-label-illegal-re "[^-a-zA-Z0-9_+=:;,.]"
  "Regexp matching characters not legal in labels."
  :group 'reftex-making-and-inserting-labels
  :type '(regexp :tag "Regular Expression"))

(defcustom reftex-abbrev-parameters '(4 2 "^aeiou" "aeiou")
  "Parameters for abbreviation of words.
MIN-CHARS    Minimum number of characters remaining after abbreviation.
MIN-KILL     Minimum number of characters to remove when abbreviating words.
BEFORE       Character class before abbrev point in word.
AFTER        Character class after  abbrev point in word."
  :group 'reftex-making-and-inserting-labels
  :type '(list
          (integer :tag "Minimum chars per word" 4)
          (integer :tag "Shorten by at least   " 2)
          (string  :tag "cut before char class " "^saeiou")
          (string  :tag "cut after  char class " "aeiou")))

(defcustom reftex-format-label-function nil
  "Function which produces the string to insert as a label definition.
Normally should be nil, unless you want to do something fancy.
The function will be called with two arguments, the LABEL and the DEFAULT
FORMAT, which usually is `\label{%s}'.  The function should return the
string to insert into the buffer."
  :group 'reftex-making-and-inserting-labels
  :type 'function)

;; Label referencing

(defgroup reftex-referencing-labels nil
  "Options on how to reference labels."
  :group 'reftex-label-support)

(eval-and-compile
  (defconst reftex-tmp
    '((const :tag "on" t)
      (const :tag "off" nil)
      (string :tag "Selected label types"))))

(defcustom reftex-label-menu-flags '(t t nil nil nil nil t nil)
  "List of flags governing the label menu makeup.
The flags are:

TABLE-OF-CONTENTS  Show the labels embedded in a table of context.
SECTION-NUMBERS    Include section numbers (like 4.1.3) in table of contents.
COUNTERS           Show counters.  This just numbers the labels in the menu.
NO-CONTEXT         Non-nil means do NOT show the short context.
FOLLOW             Follow full context in other window.
SHOW-COMMENTED     Show labels from regions which are commented out.
MATCH-IN-TOC       Obsolete flag.
SHOW FILES         Show begin and end of included files.

Each of these flags can be set to t or nil, or to a string of type letters
indicating the label types for which it should be true.  These strings work
like character classes in regular expressions.  Thus, setting one of the
flags to \"sf\" makes the flag true for section and figure labels, nil
for everything else.  Setting it to \"^sf\" makes it the other way round.
The available label types are: s (section), f (figure), t (table), i (item),
e (equation), n (footnote), plus any definitions in `reftex-label-alist'.

Most options can also be switched from the label menu itself - so if you
decide here to not have a table of contents in the label menu, you can still
get one interactively during selection from the label menu."
  :group 'reftex-referencing-labels
  :type
  `(list
    (choice :tag "Embed in table of contents      " ,@reftex-tmp)
    (choice :tag "Show section numbers            " ,@reftex-tmp)
    (choice :tag "Show individual counters        " ,@reftex-tmp)
    (choice :tag "Hide short context              " ,@reftex-tmp)
    (choice :tag "Follow context in other window  " ,@reftex-tmp)
    (choice :tag "Show commented labels           " ,@reftex-tmp)
    (choice :tag "Obsolete flag,  Don't use.      " ,@reftex-tmp)
    (choice :tag "Show begin/end of included files" ,@reftex-tmp)))

(defcustom reftex-vref-is-default nil
  "*Non-nil means, the varioref macro \\vref is used as default.
In the selection buffer, the `v' key toggles the reference macro between 
`\\ref' and `\\vref'.  The value of this variable determines the default
which is active when entering the selection process.
Instead of nil or t, this may also be a string of type letters indicating
the label types for which it should be true."
  :group  'reftex-referencing-labels
  :type `(choice :tag "\\vref is default macro" ,@reftex-tmp))

(defcustom reftex-level-indent 2
  "*Number of spaces to be used for indentation per section level."
  :group 'reftex-referencing-labels
  :type 'integer)

(defcustom reftex-guess-label-type t
  "*Non-nil means, `reftex-reference' will try to guess the label type.
To do that, RefTeX will look at the word before the cursor and compare it with
the words given in `reftex-label-alist'.  When it finds a match, RefTeX will
immediately offer the correct label menu - otherwise it will prompt you for
a label type.  If you set this variable to nil, RefTeX will always prompt."
  :group 'reftex-referencing-labels
  :type 'boolean)

(defcustom reftex-format-ref-function nil
  "Function which produces the string to insert as a reference.
Normally should be nil, because the format to insert a reference can 
already be specified in `reftex-label-alist'.
The function will be called with two arguments, the LABEL and the DEFAULT
FORMAT, which normally is `~\ref{%s}'.  The function should return the
string to insert into the buffer."
  :group 'reftex-referencing-labels
  :type 'function)

(defcustom reftex-select-label-mode-hook nil
  "Mode hook for reftex-select-label-mode."
  :group 'reftex-referencing-labels
  :type 'hook)

;; BibteX citation configuration ----------------------------------------

(defgroup reftex-citation-support nil
  "Support for referencing bibliographic data with BibTeX."
  :group 'reftex)

(defcustom reftex-bibpath-environment-variables '("BIBINPUTS" "TEXBIB")
  "*List of env vars which might contain the path to BibTeX database files.
Directories ending in `//' or `!!' will be expanded recursively when necessary
to find files."
  :group 'reftex-citation-support
  :set 'reftex-set-dirty
  :type '(repeat (string :tag "Environment variable")))

(defvar reftex-bibfile-ignore-list nil) ; compatibility
(defcustom reftex-bibfile-ignore-regexps nil
  "*List of regular expressions to exclude files in \\bibliography{..}.
File names matched by these regexps will not be parsed by RefTeX.
Intended for files which contain only `@string' macro definitions and the
like, which are ignored by RefTeX anyway."
  :group 'reftex-citation-support
  :set 'reftex-set-dirty
  :type '(repeat (regexp)))

(defcustom reftex-default-bibliography nil
  "*List of BibTeX database files which should be used if none are specified.
When `reftex-citation' is called from a document which has neither a
`\bibliography{..}' statement nor a `thebibliography' environment,
RefTeX will scan these files instead.  Intended for using
`reftex-citation' in non-LaTeX files."
  :group 'reftex-citation-support
  :type '(repeat (file)))

(defcustom reftex-sort-bibtex-matches 'reverse-year
  "*Sorting of the entries found in BibTeX databases by reftex-citation.
Possible values:
nil            Do not sort entries.
'author        Sort entries by author name.
'year          Sort entries by increasing year.
'reverse-year  Sort entries by decreasing year."
  :group 'reftex-citation-support
  :type '(choice (const :tag "not" nil)
                 (const :tag "by author" author)
                 (const :tag "by year"   year)
                 (const :tag "by year, reversed" reverse-year)))

(defcustom reftex-cite-format 'default
  "*The format of citations to be inserted into the buffer.
It can be a string or an alist.  In the simplest case this is just
the string \"\\cite{%l}\", which is also the default.  See the
definition of `reftex-cite-format-builtin' for more complex examples.

If `reftex-cite-format' is a string, it will be used as the format.
In the format, the following percent escapes will be expanded.

%l   The BibTeX label of the citation.
%a   List of author names, see also `reftex-cite-punctuation.
%2a  Like %a, but abbreviate more than 2 authors like Jones et al.
%A   First author name only.
%e   Works like %a, but on list of editor names. (%2e and %E work a well)

It is also possible to access all other BibTeX database fields:
%b booktitle     %c chapter        %d edition    %h howpublished
%i institution   %j journal        %k key        %m month
%n number        %o organization   %p pages      %P first page
%r address       %s school         %u publisher  %t title
%v volume        %y year          
%B booktitle, abbreviated          %T title, abbreviated

Usually, only %l is needed.  The other stuff is mainly for the echo area
display, and for (setq reftex-comment-citations t).

%< as a special operator kills punctuation and space around it after the 
string has been formatted.

Beware that all this only works with BibTeX database files.  When
citations are made from the \\bibitems in an explicit thebibliography
environment, only %l is available.

If `reftex-cite-format' is an alist of characters and strings, the user
will be prompted for a character to select one of the possible format
strings.
  In order to configure this variable, you can either set
`reftex-cite-format' directly yourself or set it to the SYMBOL of one of
the predefined styles (see `reftex-cite-format-builtin').  E.g.:
(setq reftex-cite-format 'natbib)"
  :group 'reftex-citation-support
  :type
  `(choice
    :format "%{%t%}: \n%[Value Menu%] %v"
    (radio :tag "Symbolic Builtins"
           :indent 4
           :value default
           ,@(mapcar
              (function
               (lambda (x)
                 (list 'const ':tag (concat (symbol-name (nth 0 x))
                                            ": " (nth 1 x))
                       (nth 0 x))))
              reftex-cite-format-builtin))
    (string :tag "format string" "\\cite{%l}")
    (repeat :tag "key-ed format strings"
            :value ((?\r . "\\cite{%l}")
                    (?t  . "\\cite{%l}") (?p . "\\cite{%l}"))
            (cons (character :tag "Key character" ?\r)
                  (string    :tag "Format string" "")))))

(defcustom reftex-comment-citations nil
  "*Non-nil means add a comment for each citation describing the full entry.
The comment is formatted according to `reftex-cite-comment-format'."
  :group 'reftex-citation-support
  :type 'boolean)

(defcustom reftex-cite-comment-format
  "%% %2a %y, %j %v, %P, %b, %e, %u, %s %<\n"
  "Citation format used for commented citations.  Must NOT contain %l.
See the variable `reftex-cite-format' for possible percent escapes."
  :group 'reftex-citation-support
  :type 'string)

(defcustom reftex-cite-view-format
  "%2a %y, %T, %B, %j %v:%P, %s %<"
  "Citation format used to display citation info in the message area.
Must NOT contain %l.  See the variable `reftex-cite-format' for
possible percent escapes."
  :group 'reftex-citation-support
  :group 'reftex-viewing-cross-references-and-citations
  :type 'string)

(defcustom reftex-cite-punctuation '(", " " \\& " " {\\it et al.}")
  "Punctuation for formatting of name lists in citations.
This is a list of 3 strings.
1. normal names separator, like \", \"     in Jones, Brown and Miller
2. final names separator,  like \" and \"  in Jones, Brown and Miller
3. The \"et al\" string,   like \" {\\it et al.}\" in Jones {\\it et al.}"
  :group 'reftex-citation-support
  :type '(list
          (string :tag "Separator for names            ")
          (string :tag "Separator for last name in list")
          (string :tag "string used as et al.          ")))

(defcustom reftex-format-cite-function nil
  "Function which produces the string to insert as a citation.
Normally should be nil, because the format to insert a reference can 
already be specified in `reftex-cite-format'.
The function will be called with two arguments, the CITATION KEY and the
DEFAULT FORMAT, which is taken from `reftex-cite-format'.  The function
should return the string to insert into the buffer."
  :group 'reftex-citation-support
  :type 'function)

(defcustom reftex-select-bib-mode-hook nil
  "Mode hook for reftex-select-bib-mode."
  :group 'reftex-citation-support
  :type 'hook)

;; Table of contents configuration --------------------------------------

(defgroup reftex-table-of-contents-browser nil
  "A multifile table of contents browser."
  :group 'reftex)

(defcustom reftex-toc-follow-mode nil
  "*Non-nil means, point in *toc* buffer will cause other window to follow.
The other window will show the corresponding part of the document.
This flag can be toggled from within the *toc* buffer with the `f' key."
  :group 'reftex-table-of-contents-browser
  :type 'boolean)

(defcustom reftex-revisit-to-follow nil
  "*Non-nil means, follow-mode will revisit files if necessary.
When nil, follow-mode will be suspended for stuff in unvisited files."
  :group 'reftex-table-of-contents-browser
  :group 'reftex-referencing-labels
  :type 'boolean)

(defcustom reftex-toc-mode-hook nil
  "Mode hook for reftex-toc-mode."
  :group 'reftex-table-of-contents-browser
  :type 'hook)

;; Viewing Cross References and Citations
(defgroup reftex-viewing-cross-references-and-citations nil
  "Displaying cross references and citations."
  :group 'reftex)

(defcustom reftex-auto-view-crossref t
  "*Non-nil means, initially turn automatic viewing of crossref info on.
Automatic viewing of crossref info normally uses the echo area.
Whenever point is on the argument of a \\ref or \\cite macro, and no
other message is being displayed, the echo area will display
information about that cross reference.  You can also set the variable
to the symbol `window'.  In this case a small temporary window is
used for the display.
This feature can be turned on and of from the menu 
(Ref->Options->Crossref Viewing)."
  :group 'reftex-viewing-cross-references-and-citations
  :type '(choice (const :tag "off" nil)
                 (const :tag "in Echo Area" t)
                 (const :tag "in Other Window" window)))

(defcustom reftex-idle-time 1.2
  "*Time (secs) Emacs has to be idle before automatic crossref display is done."
  :group 'reftex-viewing-cross-references-and-citations
  :type 'number)

(defcustom reftex-revisit-to-echo nil
  "*Non-nil means, automatic citation display will revisit files if necessary.
When nil, citation display in echo area will only be active for cached
entries and for BibTeX database files with live associated buffers."
  :group 'reftex-viewing-cross-references-and-citations
  :type 'boolean)

(defcustom reftex-cache-cite-echo t
  "*Non-nil means, the information displayed in the echo area for cite macros
is cached and even saved along with the parsing information.  The cache
survives document scans.  In order to clear it, use M-x reftex-reset-mode."
  :group 'reftex-viewing-cross-references-and-citations
  :type 'boolean)

(defcustom reftex-display-copied-context-hook nil
  "Normal Hook which is run before context is displayed anywhere.  Designed
for X-Symbol, but may have other uses as well."
  :group 'reftex-viewing-cross-references-and-citations
  :group 'reftex-referencing-labels
  :type 'hook)

;; Tuning the parser ----------------------------------------------------

(defgroup reftex-optimizations-for-large-documents nil
  "Configuration of parser speed and memory usage."
  :group 'reftex)

(defcustom reftex-keep-temporary-buffers 1
  "*Non-nil means, keep buffers created for parsing and lookup.
RefTeX sometimes needs to visit files related to the current document.
We distinguish files visited for
PARSING: Parts of a multifile document loaded when (re)-parsing the document.
LOOKUP:  BibTeX database files and TeX files loaded to find a reference,
         to display label context, etc.
The created buffers can be kept for later use, or be thrown away immediately
after use, depending on the value of this variable:

nil  Throw away as much as possible.
t    Keep everything.
1    Throw away buffers created for parsing, but keep the ones created
     for lookup.

If a buffer is to be kept, the file is visited normally (which is potentially
slow but will happen only once).
If a buffer is to be thrown away, the initialization of the buffer depends
upon the variable `reftex-initialize-temporary-buffers'."
  :group 'reftex-optimizations-for-large-documents
  :type '(choice
          (const :tag "Throw away everything" nil)
          (const :tag "Keep everything" t)
          (const :tag "Keep lookup buffers only" 1)))

(defcustom reftex-initialize-temporary-buffers nil
  "*Non-nil means do initializations even when visiting file temporarily.
When nil, RefTeX may turn off find-file hooks and other stuff to briefly
visit a file.
When t, the full default initializations are done (find-file-hook etc.).
Instead of t or nil, this variable may also be a list of hook functions to
do a minimal initialization."
  :group 'reftex-optimizations-for-large-documents
  :type '(choice
          (const :tag "Read files literally" nil)
          (const :tag "Fully initialize buffers" t)
          (repeat :tag "Hook functions" :value (nil)
           (function-item))))

(defcustom reftex-no-include-regexps '("\\.pstex_t\\'")
  "*List of regular expressions to exclude certain input files from parsing.
If the name of a file included via \\include or \\input is matched by any
of the regular expressions in this list, that file is not parsed by RefTeX."
  :group 'reftex-optimizations-for-large-documents
  :type '(repeat (regexp)))

(defcustom reftex-enable-partial-scans nil
  "*Non-nil means, re-parse only 1 file when asked to re-parse.
Re-parsing is normally requested with a `C-u' prefix to many RefTeX commands,
or with the `r' key in menus.  When this option is t in a multifile document,
we will only parse the current buffer, or the file associated with the label
or section heading near point in a menu.  Requesting re-parsing of an entire
multifile document then requires a `C-u C-u' prefix or the capital `R' key
in menus."
  :group 'reftex-optimizations-for-large-documents
  :type 'boolean)

(defcustom reftex-allow-automatic-rescan t
  "*Non-nil means, RefTeX may rescan the document when this seems necessary.
Currently this applies only to rescanning after label insertion, when
the new label cannot be inserted correctly into the internal label
list."
  :group 'reftex-optimizations-for-large-documents
  :type 'boolean)

(defcustom reftex-save-parse-info nil
  "*Non-nil means, save information gathered with parsing in a file.
The file MASTER.rel in the same directory as MASTER.tex is used to save the
information.  When this variable is t, 
- accessing the parsing information for the first time in an editing session
  will read that file (if available) instead of parsing the document.
- exiting Emacs or killing a buffer in reftex-mode will cause a new version
  of the file to be written."
  :group 'reftex-optimizations-for-large-documents
  :type 'boolean)

(defcustom reftex-use-multiple-selection-buffers nil
  "*Non-nil means use a separate selection buffer for each label type.
These buffers are kept from one selection to the next and need not to be
created for each use - so the menu generally comes up faster.  The
selection buffers will be erased (and therefore updated) automatically
when new labels in its category are added.  See the variable
`reftex-auto-update-selection-buffers'."
  :group 'reftex-optimizations-for-large-documents
  :group 'reftex-referencing-labels
  :type 'boolean)

(defcustom reftex-auto-update-selection-buffers t
  "*Non-nil means, selection buffers will be updated automatically.
When a new label is defined with `reftex-label', all selection buffers
associated with that label category are emptied, in order to force an
update upon next use.  When nil, the buffers are left alone and have to be
updated by hand, with the `g' key from the label selection process.
The value of this variable will only have any effect when
`reftex-use-multiple-selection-buffers' is non-nil."
  :group 'reftex-optimizations-for-large-documents
  :group 'reftex-referencing-labels
  :type 'boolean)

;; Fontification and Faces ----------------------------------------------

(defgroup reftex-fontification-configurations nil
  "Options concerning the faces used in RefTeX."
  :group 'reftex)

(defcustom reftex-use-fonts t
  "*Non-nil means, use fonts in *toc* and selection buffers.
Font-lock must be loaded as well to actually get fontified display.
When changing this option, a rescan may be necessary to activate the change."
  :group 'reftex-fontification-configurations
  :type 'boolean)

(defcustom reftex-refontify-context 1
  "*Non-nil means, re-fontify the context in the label menu with font-lock.
This slightly slows down the creation of the label menu.  It is only necessary
when you definitely want the context fontified.

This option may have 3 different values:
nil  Never refontify.
t    Always refontify.
1    Refontify when absolutely necessary, e.g. when old versions of X-Symbol.
The option is ignored when `reftex-use-fonts' is nil."
  :group 'reftex-fontification-configurations
  :group 'reftex-referencing-labels
  :type '(choice
          (const :tag "Never" nil)
          (const :tag "Always" t)
          (const :tag "When necessary" 1)))

(defcustom reftex-highlight-selection 'cursor
  "*Non-nil mean, highlight selected text in selection and *toc* buffers.
Normally, the text near the cursor is the selected text, and it is
highlighted.  This is the entry most keys in the selction and *toc*
buffers act on.  However, if you mainly use the mouse to select an
item, you may find it nice to have mouse-triggered highlighting
instead or as well. The variable may have one of these values:

   nil      No highlighting.
   cursor   Highlighting is cursor driven.
   mouse    Highlighting is mouse driven.
   both     Both cursor and mouse trigger highlighting.

Changing this variable requires to rebuild the selection and *toc* buffers
to become effective (keys `g' or `r')."
  :group 'reftex-fontification-configurations
  :type '(choice
          (const :tag "Never" nil)
          (const :tag "Cursor driven" cursor)
          (const :tag "Mouse driven" mouse)
          (const :tag "Mouse and Cursor driven." both)))

(defcustom reftex-cursor-selected-face 'highlight
  "Face name to highlight cursor selected item in toc and selection buffers.
See also the variable `reftex-highlight-selection'."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-mouse-selected-face 'secondary-selection
  "Face name to highlight mouse selected item in toc and selection buffers.
See also the variable `reftex-highlight-selection'."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-file-boundary-face 'font-lock-comment-face
  "Face name for file boundaries in selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-label-face 'font-lock-constant-face
  "Face name for labels in selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-section-heading-face 'font-lock-function-name-face
  "Face name for section headings in toc and selection buffers."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-toc-header-face 'font-lock-comment-face
  "Face name for the header of a toc buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-bib-author-face 'font-lock-keyword-face
  "Face name for author names in bib selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-bib-year-face 'font-lock-comment-face
  "Face name for year in bib selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-bib-title-face 'font-lock-function-name-face
  "Face name for article title in bib selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)
(defcustom reftex-bib-extra-face 'font-lock-comment-face
  "Face name for bibliographic information in bib selection buffer."
  :group 'reftex-fontification-configurations
  :type 'symbol)

(defcustom reftex-pre-refontification-functions nil
  "X-Symbol specific hook.
Functions get two arguments, the buffer from where the command started and a
symbol indicating in what context the hook is called."
  :group 'reftex-fontification-configurations
  :type 'hook)

;; Miscellaneous configurations -----------------------------------------

(defgroup reftex-miscellaneous-configurations nil
  "Collection of further configurations."
  :group 'reftex)

(defcustom reftex-extra-bindings nil
  "Non-nil means, make additional key bindings on startup.
These extra bindings are located in the users `C-c letter' map."
  :group 'reftex-miscellaneous-configurations
  :type 'boolean)

(defcustom reftex-plug-into-AUCTeX nil
  "*Plug-in flags for AUCTeX interface.
This variable is a list of 4 boolean flags.  When a flag is non-nil,
RefTeX will

  - supply labels in new sections and environments  (flag 1)
  - supply arguments for macros like `\\label'.      (flag 2)
  - supply arguments for macros like `\\ref'.        (flag 3)
  - supply arguments for macros like `\\cite'.       (flag 4)

You may also set the variable itself to t or nil in order to turn all
plug-ins on or off, respectively.
\\<LaTeX-mode-map>Supplying labels in new sections and environments aplies when creating
sections with \\[LaTeX-section] and environments with \\[LaTeX-environment].
Supplying macro arguments applies when you insert such a macro interactively
with \\[TeX-insert-macro].
See the AUCTeX documentation for more information.
RefTeX uses `fset' to take over the function calls.  Changing the variable
may require a restart of Emacs in order to become effective."
  :group 'reftex-miscellaneous-configurations
  :group 'LaTeX
  :type '(choice 
          (const :tag "No plug-ins" nil)
          (const :tag "All possible plug-ins" t)
          (list
           :tag "Individual choice"
           :value (t t t t)
           (boolean :tag "supply label in new sections and environments")
           (boolean :tag "supply argument for macros like `\\label'     ")
           (boolean :tag "supply argument for macros like `\\ref'       ")
           (boolean :tag "supply argument for macros like `\\cite'      ")
           )))

(defcustom reftex-allow-detached-macro-args nil
  "*Non-nil means, allow arguments of macros to be detached by whitespace.
When this is t, `aaa' will be considered as argument of \\bb in the following
construct:  \\bbb [xxx] {aaa}."
  :group 'texmathp
  :type 'boolean)


(defcustom reftex-load-hook nil
  "Hook which is being run when loading reftex.el."
  :group 'reftex-miscellaneous-configurations
  :type 'hook)

(defcustom reftex-mode-hook nil
  "Hook which is being run when turning on RefTeX mode."
  :group 'reftex-miscellaneous-configurations
  :type 'hook)

;;; =========================================================================
;;;
;;; Define the formal stuff for a minor mode named RefTeX.
;;;

(defconst reftex-version "RefTeX version 3.38"
  "Version string for RefTeX.")

(defvar reftex-mode nil
  "Determines if RefTeX mode is active.")
(make-variable-buffer-local 'reftex-mode)

(defvar reftex-mode-map (make-sparse-keymap)
  "Keymap for RefTeX mode.")

(defvar reftex-mode-menu nil)

;;;###autoload
(defun turn-on-reftex ()
  "Turn on RefTeX mode."
  (reftex-mode t))

;;;###autoload
(defun reftex-mode (&optional arg)
  "Minor mode with distinct support for \\label, \\ref and \\cite in LaTeX.

Labels can be created with `\\[reftex-label]' and referenced with `\\[reftex-reference]'.
When referencing, you get a menu with all labels of a given type and
context of the label definition.  The selected label is inserted as a
\\ref macro.

Citations can be made with `\\[reftex-citation]' which will use a regular expression
to pull out a *formatted* list of articles from your BibTeX
database.  The selected citation is inserted as a \\cite macro.

A Table of Contents of the entire (multifile) document with browsing
capabilities is available with `\\[reftex-toc]'.

Most command have help available on the fly.  This help is accessed by
pressing `?' to any prompt mentioning this feature.

Extensive documentation about RefTeX is in the file header of `reftex.el'.
You can view this information with `\\[reftex-show-commentary]'.

\\{reftex-mode-map}
Under X, these and other functions will also be available as `Ref' menu
on the menu bar.

------------------------------------------------------------------------------"

  (interactive "P")
  (setq reftex-mode (not (or (and (null arg) reftex-mode)
                             (<= (prefix-numeric-value arg) 0))))

  ; Add or remove the menu, and run the hook
  (if reftex-mode
      (progn
        (easy-menu-add reftex-mode-menu)
        (and reftex-plug-into-AUCTeX
             (reftex-plug-into-AUCTeX))
        (run-hooks 'reftex-mode-hook))
    (easy-menu-remove reftex-mode-menu)))

(if (fboundp 'add-minor-mode)
    ;; Use it so that we get the extras
    (progn
      (put 'reftex-mode ':included '(memq major-mode '(latex-mode tex-mode)))
      (put 'reftex-mode ':menu-tag "RefTeX Mode")
      (add-minor-mode 'reftex-mode " Ref" reftex-mode-map))
  ;; The standard way
  (unless (assoc 'reftex-mode minor-mode-alist)
    (push '(reftex-mode " Ref") minor-mode-alist))
  (unless (assoc 'reftex-mode minor-mode-map-alist)
    (push (cons 'reftex-mode reftex-mode-map) minor-mode-map-alist)))

;;; =========================================================================
;;;
;;; Silence warnings about variables in other packages.
(defvar TeX-master)
(defvar LaTeX-section-hook)
(defvar LaTeX-label-function)
(defvar tex-main-file)
(defvar outline-minor-mode)
(defvar font-lock-mode)
(defvar font-lock-fontify-region-function)
(defvar font-lock-syntactic-keywords)

;;; =========================================================================
;;;
;;; Multibuffer Variables
;;;
;;; Technical notes: These work as follows: We keep just one list
;;; of labels for each master file - this can save a lot of memory.
;;; `reftex-master-index-list' is an alist which connects the true file name
;;; of each master file with the symbols holding the information on that
;;; document.  Each buffer has local variables which point to these symbols.

;; List of variables which handle the multifile stuff.
;; This list is used to tie, untie, and reset these symbols.
(defconst reftex-multifile-symbols
  '(reftex-docstruct-symbol))

;; Alist connecting master file names with the corresponding lisp symbols.
(defvar reftex-master-index-list nil)

;; Last index used for a master file.
(defvar reftex-multifile-index 0)

;; Variable holding the symbol with the label list of the document.
(defvar reftex-docstruct-symbol nil)
(make-variable-buffer-local 'reftex-docstruct-symbol)

(defun reftex-next-multifile-index ()
  ;; Return the next free index for multifile symbols.
  (incf reftex-multifile-index))

(defun reftex-tie-multifile-symbols ()
  ;; Tie the buffer-local symbols to globals connected with the master file.
  ;; If the symbols for the current master file do not exist, they are created.

  (let* ((master (file-truename (reftex-TeX-master-file)))
         (index (assoc master reftex-master-index-list))
         (symlist reftex-multifile-symbols)
         symbol symname newflag)
    ;; Find the correct index.
    (if index
        ;; symbols do exist
        (setq index (cdr index))
      ;; Get a new index and add info to the alist.
      (setq index (reftex-next-multifile-index)
            newflag t)
      (push (cons master index) reftex-master-index-list))

    ;; Get/create symbols and tie them.
    (while symlist
      (setq symbol (car symlist)
            symlist (cdr symlist)
            symname (symbol-name symbol))
      (set symbol (intern (concat symname "-" (int-to-string index))))
      (put (symbol-value symbol) ':master-index index)
      ;; Initialize if new symbols.
      (if newflag (set (symbol-value symbol) nil)))

    ;; Return t if the symbols did already exist, nil when we've made them.
    (not newflag)))

(defun reftex-untie-multifile-symbols ()
  ;; Remove ties from multifile symbols, so that next use makes new ones.
  (let ((symlist reftex-multifile-symbols)
        (symbol nil))
    (while symlist
      (setq symbol  (car symlist)
            symlist (cdr symlist))
      (set symbol nil))))

(defun reftex-TeX-master-file ()
  ;; Return the name of the master file associated with the current buffer.
  ;; When AUCTeX is loaded, we will use it's more sophisticated method.
  ;; We also support the default TeX and LaTeX modes by checking for a
  ;; variable tex-main-file.
  (let
      ((master
        (cond
         ((fboundp 'TeX-master-file) ; AUCTeX is loaded.  Use its mechanism.
          (TeX-master-file t))
         ((boundp 'TeX-master)       ; The variable is defined - lets use it.
          (cond
           ((eq TeX-master t)
            (buffer-file-name))
           ((eq TeX-master 'shared)
            (setq TeX-master (read-file-name "Master file: "
                                             nil nil t nil)))
           (TeX-master)
           (t
            (setq TeX-master (read-file-name "Master file: "
                                             nil nil t nil)))))
         ((boundp 'tex-main-file)
          ;; This is the variable from the default TeX modes.
          (cond
           ((stringp tex-main-file)
            ;; ok, this must be it
            tex-main-file)
           (t
            ;; In this case, the buffer is its own master.
            (buffer-file-name))))
         (t
          ;; Know nothing about master file.  Assume this is a master file.
          (buffer-file-name)))))
    (cond
     ((null master)
      (error "Need a filename for this buffer,  please save it first"))
     ((or (file-exists-p (concat master ".tex"))
          (reftex-get-buffer-visiting (concat master ".tex")))
      ;; Ahh, an extra .tex was missing...
      (setq master (concat master ".tex")))
     ((or (file-exists-p master)
          (reftex-get-buffer-visiting master))
      ;; We either see the file, or have a buffer on it.  OK.
      )
     (t
      ;; Use buffer file name.
      (buffer-file-name)))
    (expand-file-name master)))

;;; =========================================================================
;;;
;;; Functions to parse the buffer and to create and reference labels.

;; The following constants are derived from `reftex-label-alist'.

;; Prompt used for label type queries directed to the user.
(defconst reftex-type-query-prompt nil)

;; Help string for label type queries.
(defconst reftex-type-query-help nil)

;; Alist relating label type to reference format.
(defconst reftex-typekey-to-format-alist nil)

;; Alist relating label type to label affix.
(defconst reftex-typekey-to-prefix-alist nil)

;; Alist relating environments or macros to label type and context regexp.
(defconst reftex-env-or-mac-alist nil)

;; List of macros carrying a label.
(defconst reftex-label-mac-list nil)

;; List of environments carrying a label.
(defconst reftex-label-env-list nil)

;; List of all typekey letters in use.
(defconst reftex-typekey-list nil)

;; Alist relating magic words to a label type.
(defconst reftex-words-to-typekey-alist nil)

;; The last list-of-labels entry used in a reference.
(defvar reftex-last-used-reference (list nil nil nil nil))

;; The message when follow-mode is suspended
(defconst reftex-no-follow-message
  "No follow-mode into unvisited file.  Press SPC to visit it.")
(defconst reftex-no-info-message
  "%s: info not available, use `\\[reftex-view-crossref]' to get it.")

;; The regular expression used to abbreviate words.
(defconst reftex-abbrev-regexp
  (concat
   "\\`\\("
   (make-string (nth 0 reftex-abbrev-parameters) ?.)
   "[" (nth 2 reftex-abbrev-parameters) "]*"
   "\\)"
   "[" (nth 3 reftex-abbrev-parameters) "]"
   (make-string (1- (nth 1 reftex-abbrev-parameters)) ?.)))

;; Global variables used for communication between functions.
(defvar reftex-default-context-position nil)
(defvar reftex-location-start nil)
(defvar reftex-call-back-to-this-buffer nil)
(defvar reftex-select-return-marker (make-marker))
(defvar reftex-active-toc nil)
(defvar reftex-tex-path nil)
(defvar reftex-bib-path nil)
(defvar reftex-last-follow-point nil)
(defvar reftex-latex-syntax-table nil)
(defvar reftex-prefix nil)
(defvar reftex-section-levels-all nil)
(defvar reftex-buffers-with-changed-invisibility nil)

;; List of buffers created temporarily for lookup, which should be killed.
(defvar reftex-buffers-to-kill nil)

;; Regexp to find anything.
(defvar reftex-section-regexp nil)
(defvar reftex-section-or-include-regexp nil)
(defvar reftex-everything-regexp nil)
(defvar reftex-find-label-regexp-format nil)
(defvar reftex-find-label-regexp-format2 nil)

;;; The parser functions -----------------------------------------------------

(defvar reftex-memory nil
  "Memorizes old variable values to indicate changes in these variables.")

(defun reftex-access-scan-info (&optional rescan file)
  "Ensure access to the scanning info for the current file."
  ;; When the multifile symbols are not yet tied,
  ;; tie them.  When they are empty or RESCAN is non-nil, scan the document.
  ;; But, when RESCAN is -1, don't rescan even if docstruct is empty.
  ;; When FILE is non-nil, parse only from that file.

  ;; Make sure we have the symbols tied
  (if (eq reftex-docstruct-symbol nil)
      ;; Symbols are not yet tied: Tie them.
      (reftex-tie-multifile-symbols))

  (reftex-ensure-compiled-variables)

  (when (or (null (symbol-value reftex-docstruct-symbol))
            (member rescan '(t 1 (4) (16))))
    ;; The docstruct will change: Remove selection buffers.
    (save-excursion
      (reftex-erase-all-selection-buffers)))

  (if (and (null (symbol-value reftex-docstruct-symbol))
           (not (member rescan '(t 1 (4) (16))))
           reftex-save-parse-info)
      ;; Try to read the stuff from a file
      (reftex-access-parse-file 'read))

  (cond
   ((equal rescan -1))  ;; We are not allowed to scan.
   ((not (symbol-value reftex-docstruct-symbol))
    ;; Scan the whole document
    (reftex-do-parse 1 file))
   ((member rescan '(t 1 (4) (16)))
    ;; Scan whatever was required by the caller.
    (reftex-do-parse rescan file))))

(defun reftex-parse-one ()
  "Re-parse this file."
  (interactive)
  (let ((reftex-enable-partial-scans t))
    (reftex-access-scan-info '(4))))

(defun reftex-parse-all ()
  "Re-parse entire document."
  (interactive)
  (reftex-access-scan-info '(16)))

(defun reftex-do-parse (rescan &optional file)
  "Do a document rescan.  When allowed, do only a partial scan from FILE."

  ;; Normalize the rescan argument
  (setq rescan (cond ((eq rescan t) t)
                     ((eq rescan 1) 1)
                     ((equal rescan '(4)) t)
                     ((equal rescan '(16)) 1)
                     (t 1)))

  ;; Partial scans only when allowed
  (unless reftex-enable-partial-scans
    (setq rescan 1))

  ;; Do the scanning.

  (let* ((old-list (symbol-value reftex-docstruct-symbol))
         (master (reftex-TeX-master-file))
         (true-master (file-truename master))
         (master-dir (file-name-as-directory (file-name-directory master)))
         (file (or file (buffer-file-name)))
         (true-file (file-truename file))
         (bibview-cache (assq 'bibview-cache old-list))
         from-file appendix docstruct tmp)

    ;; Make sure replacement is really an option here
    (when (and (eq rescan t)
               (not (and (member (list 'bof file) old-list)
                         (member (list 'eof file) old-list))))
      ;; Scan whole document because no such file section exists
      (setq rescan 1))
    (when (string= true-file true-master)
      ;; Scan whole document because this file is the master
      (setq rescan 1))

    ;; From which file do we start?
    (setq from-file
          (cond ((eq rescan t) (or file master))
                ((eq rescan 1) master)
                (t (error "This should not happen (reftex-do-parse)"))))

    ;; Find active toc entry and initialize section-numbers
    (setq reftex-active-toc (reftex-last-assoc-before-elt
                             'toc (list 'bof from-file) old-list)
          appendix (reftex-last-assoc-before-elt
                    'appendix (list 'bof from-file) old-list))

    (reftex-init-section-numbers reftex-active-toc appendix)

    (if (eq rescan 1)
        (message "Scanning entire document...")
      (message "Scanning document from %s..." from-file))

    (save-window-excursion
      (save-excursion
        (unwind-protect
            (setq docstruct
                  (reftex-parse-from-file
                   from-file docstruct master-dir))
          (reftex-kill-temporary-buffers))))

    (message "Scanning document... done")

    ;; Turn the list around.
    (setq docstruct (nreverse docstruct))

    ;; Set or insert
    (setq docstruct (reftex-replace-label-list-segment
                     old-list docstruct (eq rescan 1)))

    ;; Add all missing information
    (unless (assq 'label-numbers docstruct)
      (push (cons 'label-numbers nil) docstruct))
    (unless (assq 'master-dir docstruct)
      (push (cons 'master-dir master-dir) docstruct))
    (unless (assq 'bibview-cache docstruct)
      (push (cons 'bibview-cache (cdr bibview-cache)) docstruct))
    (let* ((bof1 (memq (assq 'bof docstruct) docstruct))
           (bof2 (assq 'bof (cdr bof1)))
           (is-multi (not (not (and bof1 bof2))))
           (entry (or (assq 'is-multi docstruct)
                      (car (push (list 'is-multi is-multi) docstruct)))))
      (setcdr entry (cons is-multi nil)))
    (unless (assq 'xr docstruct)
      (let* ((allxr (reftex-all-assq 'xr-doc docstruct))
             (alist (mapcar
                     (function
                      (lambda (x) 
                        (if (setq tmp (reftex-find-tex-file (nth 2 x)
                                                            master-dir))
                            (cons (nth 1 x) tmp)
                          (message "Can't find external document %s"
                                   (nth 2 x))
                          nil)))
                    allxr))
             (alist (delq nil alist))
             (allprefix (delq nil (mapcar 'car alist)))
             (regexp (if allprefix
                         (concat "\\`\\(" 
                                 (mapconcat 'identity allprefix "\\|")
                                 "\\)")
                       "\\\\\\\\\\\\")))   ; this will never match
        (push (list 'xr alist regexp) docstruct)))

    (set reftex-docstruct-symbol docstruct)
    (put reftex-docstruct-symbol 'modified t)))

(defun reftex-parse-from-file (file docstruct master-dir)
  ;; Scan the buffer for labels and save them in a list.
  (let ((regexp reftex-everything-regexp)
        (bound 0)
        file-found tmp include-file
        (level 1)
        (highest-level 100)
        toc-entry next-buf buf)

    (catch 'exit
      (setq file-found (reftex-find-tex-file file master-dir))
      (if (and (not file-found)
               (setq buf (reftex-get-buffer-visiting file)))
          (setq file-found (buffer-file-name buf)))

      (unless file-found
        (push (list 'file-error file) docstruct)
        (throw 'exit nil))

      (save-excursion

        (message "Scanning file %s" file)
        (set-buffer
         (setq next-buf
               (reftex-get-file-buffer-force
                file-found
                (not (eq t reftex-keep-temporary-buffers)))))

        ;; Begin of file mark
        (setq file (buffer-file-name))
        (push (list 'bof file) docstruct)

        (save-excursion
          (save-restriction
            (widen)
            (goto-char 1)

            (while (re-search-forward regexp nil t)

              (cond

               ((match-end 1)
               ;; It is a label
                (push (reftex-label-info (reftex-match-string 1) file bound)
                      docstruct))

               ((match-end 3)
                ;; It is a section
                (setq bound (point))

                ;; Insert in List
                (setq toc-entry (reftex-section-info file))
                (setq level (nth 5 toc-entry))
                (setq highest-level (min highest-level level))
                (if (= level highest-level)
                    (message
                     "Scanning %s %s ..."
                     (car (rassoc level reftex-section-levels))
                     (nth 6 toc-entry)))

                (push toc-entry docstruct)
                (setq reftex-active-toc toc-entry))

               ((match-end 7)
                ;; It's an include or input
                (setq include-file (reftex-match-string 7))
                ;; Test if this file should be ignored
                (unless (delq nil (mapcar 
                                   (lambda (x) (string-match x include-file))
                                   reftex-no-include-regexps))
                  ;; Parse it
                  (setq docstruct
                        (reftex-parse-from-file
                         include-file
                         docstruct master-dir))))

               ((match-end 9)
                ;; Appendix starts here
                (reftex-init-section-numbers nil t)
                (push (cons 'appendix t) docstruct))

               ((match-end 10)
                ;; A macro with label
                (save-excursion
                  (let* ((mac (reftex-match-string 10))
                         (label (progn (goto-char (match-end 10))
                                       (save-match-data
                                         (reftex-no-props
                                          (reftex-nth-arg-wrapper
                                           mac)))))
                         (typekey (nth 1 (assoc mac reftex-env-or-mac-alist)))
                         (entry (progn (if typekey
                                           ;; A typing macro
                                           (goto-char (match-end 0))
                                         ;; A newtral macro
                                         (goto-char (match-end 10))
                                         (reftex-move-over-touching-args))
                                       (reftex-label-info
                                        label file bound nil nil))))
                    (push entry docstruct))))
               (t (error "This should not happen (reftex-parse-from-file)")))
              )

            ;; Find bibliography statement
            (when (setq tmp (reftex-locate-bibliography-files master-dir))
              (push (cons 'bib tmp) docstruct))

            (goto-char 1)
            (when (re-search-forward 
                   "\\(\\`\\|[\n\r]\\)[ \t]*\\\\begin{thebibliography}" nil t)
              (push (cons 'thebib file) docstruct))
                   
            ;; Find external document specifications
            (goto-char 1)
            (while (re-search-forward "[\n\r][ \t]*\\\\externaldocument\\(\\[\\([^]]*\\)\\]\\)?{\\([^}]+\\)}" nil t)
              (push (list 'xr-doc (reftex-match-string 2)
                          (reftex-match-string 3))
                    docstruct))

            ;; End of file mark
            (push (list 'eof file) docstruct))))

      ;; Kill the scanned buffer
      (reftex-kill-temporary-buffers next-buf))

    ;; Return the list
    docstruct))

(defun reftex-locate-bibliography-files (master-dir)
  ;; Scan buffer for bibliography macro and return file list.
  (let (files)
    (save-excursion
      (goto-char (point-min))
      (when (re-search-forward
             "\\(\\`\\|[\n\r]\\)[ \t]*\\\\bibliography{[ \t]*\\([^}]+\\)" nil t)
        (setq files (split-string (reftex-match-string 2)
                                      "[ \t\n\r]*,[ \t\n\r]*"))
        (setq files 
              (mapcar
               (lambda (x)
                 (if (or (member x reftex-bibfile-ignore-list)
                         (delq nil (mapcar (lambda (re) (string-match re x))
                                           reftex-bibfile-ignore-regexps)))
                     ;; excluded file
                     nil
                   ;; find the file
                   (reftex-find-bib-file
                    (if (string-match "\\.bib\\'" x) x (concat x ".bib"))
                    master-dir)))
               files))
        (delq nil files)))))

(defun reftex-replace-label-list-segment (old insert &optional entirely)
  ;; Replace the segment in OLD which corresponds to INSERT.
  ;; Works with side effects, directly changes old.
  ;; If entirely is t, just return INSERT.
  ;; This function also makes sure the old toc markers do not point anywhere.

  (cond
   (entirely
    (reftex-silence-toc-markers old (length old))
    insert)
   (t (let* ((new old)
             (file (nth 1 (car insert)))
             (eof-list (member (list 'eof file) old))
             (bof-list (member (list 'bof file) old))
             n)
        (if (not (and bof-list eof-list))
            (error "Cannot splice")
          ;; Splice
          (reftex-silence-toc-markers bof-list (- (length bof-list)
                                                  (length eof-list)))
          (setq n (- (length old) (length bof-list)))
          (setcdr (nthcdr n new) (cdr insert))
          (setcdr (nthcdr (1- (length new)) new) (cdr eof-list)))
        new))))

(defun reftex-silence-toc-markers (list n)
  ;; Set all toc markers in the first N entries in list to nil
  (while (and list (> (decf n) -1))
    (and (eq (car (car list)) 'toc)
         (markerp (nth 4 (car list)))
         (set-marker (nth 4 (car list)) nil))
    (pop list)))

(defun reftex-access-parse-file (action)
  "Perform ACTION on the parse file (the .rel file).
Valid actions are: readable, restore, read, kill, write."
  (let* ((list (symbol-value reftex-docstruct-symbol))
         (docstruct-symbol reftex-docstruct-symbol)
         (master (reftex-TeX-master-file))
         (enable-local-variables nil)
         (file (if (string-match "\\.[a-zA-Z]+\\'" master)
                   (concat (substring master 0 (match-beginning 0)) ".rel")
                 (concat master ".rel"))))
    (cond
     ((eq action 'readable)
      (file-readable-p file))
     ((eq action 'restore)
      (put reftex-docstruct-symbol 'modified nil)
      (if (eq reftex-docstruct-symbol nil)
          ;; Symbols are not yet tied: Tie them.
          (reftex-tie-multifile-symbols))
      (if (file-exists-p file)
          ;; load the file and return t for success
          (condition-case nil
              (progn (load-file file) t)
            (error (set reftex-docstruct-symbol nil)
                   (error "Error while loading file %s" file)))
        ;; Throw an exception if the file does not exist
        (error "No restore file %s" file)))
     ((eq action 'read)
      (put reftex-docstruct-symbol 'modified nil)
      (if (file-exists-p file)
          ;; load the file and return t for success
          (condition-case nil
              (progn (load-file file) t)
            (error (message "Error while loading file %s" file)
                   (set reftex-docstruct-symbol nil)
                   nil))
        ;; return nil for failure, but no exception
        nil))
     ((eq action 'kill)
      ;; Remove the file
      (when (and (file-exists-p file) (file-writable-p file))
        (message "Unlinking file %s" file)
        (delete-file file)))
     (t
      (put docstruct-symbol 'modified nil)
      (save-excursion
        (if (file-writable-p file)
            (progn
              (message "Writing parse file %s" (abbreviate-file-name file))
              (find-file file)
              (erase-buffer)
              (insert (format ";; RefTeX parse info file\n"))
              (insert (format ";; File: %s\n" master))
              (insert (format ";; User: %s (%s)\n\n"
                              (user-login-name) (user-full-name)))
              (insert "(set reftex-docstruct-symbol '(\n\n")
              (let ((standard-output (current-buffer)))
                (mapcar
                 (function
                  (lambda (x)
                    (cond ((eq (car x) 'toc)
                           ;; A toc entry. Do not save the marker.
                           ;; Save the markers  position at position 8
                           (print (list 'toc "toc" (nth 2 x) (nth 3 x)
                                        nil (nth 5 x) (nth 6 x) (nth 7 x)
                                        (or (and (markerp (nth 4 x))
                                                 (marker-position (nth 4 x)))
                                            (nth 8 x)))))
                          (t (print x)))))
                 list))
              (insert "))\n\n")
              (save-buffer 0)
              (kill-buffer (current-buffer)))
          (error "Cannot write to file %s" file)))
      t))))

(defun reftex-kill-buffer-hook ()
  "Save RefTeX's parse file for this buffer if the information has changed."
  ;; Save the parsing information if it was modified.
  ;; This function should be installed in `kill-buffer-hook'.
  ;; We are careful to make sure nothing goes wring in this function.
  (when (and (boundp 'reftex-mode)  reftex-mode
             (boundp 'reftex-save-parse-info)  reftex-save-parse-info
             (boundp 'reftex-docstruct-symbol)  reftex-docstruct-symbol
             (symbol-value reftex-docstruct-symbol)
             (get reftex-docstruct-symbol 'modified))
    ;; Write the file.
    (condition-case nil
        (reftex-access-parse-file 'write)
      (error nil))))

(defun reftex-kill-emacs-hook ()
  "Call `reftex-kill-buffer-hook' on all buffers."
  ;; This function should be installed in `kill-emacs-hook'.
  (save-excursion
    (mapcar (lambda (buf)
              (set-buffer buf)
              (reftex-kill-buffer-hook))
            (buffer-list))))

(defun reftex-section-info (file)
  ;; Return a section entry for the current match.
  ;; Carefull: This function expects the match-data to be still in place!
  (let* ((marker (set-marker (make-marker) (1- (match-beginning 3))))
         (macro (reftex-match-string 3))
         (star (= ?* (char-after (match-end 3))))
         (level (cdr (assoc macro reftex-section-levels-all)))
         (section-number (reftex-section-number level star))
         (text1 (save-match-data (save-excursion (reftex-context-substring))))
         (literal (buffer-substring-no-properties
                   (1- (match-beginning 3))
                   (min (point-max) (+ (match-end 0) (length text1) 1))))
         ;; Literal can be too short since text1 too short. No big problem. 
         (text (reftex-nicify-text text1)))

    ;; Add section number and indentation
    (setq text
          (concat
           (make-string (* reftex-level-indent level) ?\ )
           (if (nth 1 reftex-label-menu-flags) ; section number flag
               (concat section-number " "))
           text))
    (list 'toc "toc" text file marker level section-number
          literal (marker-position marker))))

(defun reftex-label-info-update (cell)
  ;; Update information about just one label in a different file.
  ;; CELL contains the old info list
  (let* ((label   (nth 0 cell))
         (typekey (nth 1 cell))
         ;; (text    (nth 2 cell))
         (file    (nth 3 cell))
         (comment (nth 4 cell))
         (note    (nth 5 cell))
         (buf (reftex-get-file-buffer-force
               file (not (eq t reftex-keep-temporary-buffers)))))
    (if (not buf)
        (list label typekey "" file comment "LOST LABEL.  RESCAN TO FIX.")
      (save-excursion
        (set-buffer buf)
        (save-restriction
          (widen)
          (goto-char 1)

          (if (or (re-search-forward
                   (format reftex-find-label-regexp-format
                           (regexp-quote label)) nil t)
                  (re-search-forward
                   (format reftex-find-label-regexp-format2
                           (regexp-quote label)) nil t))

              (progn
                (backward-char 1)
                (append (reftex-label-info label file) (list note)))
            (list label typekey "" file "LOST LABEL.  RESCAN TO FIX.")))))))

(defun reftex-label-info (label &optional file bound derive env-or-mac)
  ;; Return info list on LABEL at point.
  (let* ((env-or-mac (or env-or-mac (reftex-label-location bound)))
         (typekey (nth 1 (assoc env-or-mac reftex-env-or-mac-alist)))
         (file (or file (buffer-file-name)))
         (parse (if (reftex-typekey-check
                     typekey reftex-use-text-after-label-as-context)
                    nil
                  (nth 2 (assoc env-or-mac reftex-env-or-mac-alist))))
         (text (reftex-short-context env-or-mac parse reftex-location-start
                                     derive))
         (in-comment (reftex-in-comment)))
    (list label typekey text file in-comment)))

(defun reftex-in-comment ()
  (save-excursion
    (skip-chars-backward "^%\n\r")
    (eq (preceding-char) ?%)))

(defun reftex-short-context (env parse &optional bound derive)
  ;; Get about one line of useful context for the label definition at point.

  (if (consp parse)
      (setq parse (if derive (cdr parse) (car parse))))

  (reftex-nicify-text

   (cond

    ((null parse)
     (save-excursion
       (reftex-context-substring)))

    ((eq parse t)
     (if (string= env "section")
         ;; special treatment for section labels
         (save-excursion
           (if (and (re-search-backward reftex-section-or-include-regexp
                                        (point-min) t)
                    (match-end 2))
               (progn
                 (goto-char (match-end 0))
                 (reftex-context-substring))
             (if reftex-active-toc
                 (progn
                   (string-match "{\\([^}]*\\)" (nth 7 reftex-active-toc))
                   (match-string 1 (nth 7 reftex-active-toc)))
               "SECTION HEADING NOT FOUND")))
       (save-excursion
         (goto-char reftex-default-context-position)
         (unless (eq (string-to-char env) ?\\)
           (reftex-move-over-touching-args))
         (reftex-context-substring))))

    ((stringp parse)
     (save-excursion
       (if (re-search-backward parse bound t)
           (progn
             (goto-char (match-end 0))
             (reftex-context-substring))
         "NO MATCH FOR CONTEXT REGEXP")))

    ((integerp parse)
     (or (save-excursion
           (goto-char reftex-default-context-position)
           (reftex-nth-arg
            parse
            (nth 6 (assoc env reftex-env-or-mac-alist))))
         ""))

    ((fboundp parse)
     ;; A hook function.  Call it.
     (save-excursion
       (condition-case error-var
           (funcall parse env)
         (error (format "HOOK ERROR: %s" (cdr error-var))))))
    (t
     "ILLEGAL VALUE OF PARSE"))))

(defun reftex-nicify-text (text)
  ;; Make TEXT nice for inclusion as context into label menu
  ;; remove line breaks and extra white space
  (while (string-match "[\n\r\t]\\|[ \t][ \t]+" text)
    (setq text (replace-match " " nil t text)))
  ;; cut before the next `\end{' or `\item' or `\\'
  (if (string-match "\\(\\\\end{\\|\\\\item\\|\\\\\\\\\\).*" text)
      (setq text (replace-match "" nil t text)))
  ;; kill the embedded label
  (if (string-match "\\\\label{[^}]*}" text)
      (setq text (replace-match "" nil t text)))
  ;; remove leading garbage
  (if (string-match "\\`[ }]+" text)
      (setq text (replace-match "" nil t text)))
  ;; limit length
  (cond
   ((> (length text) 100) (substring text 0 100))
   ((= (length text) 0) (make-string 1 ?\ ))
   (t text)))

(defun reftex-where-am-I ()
  ;; Return the docstruct entry above point.  Actually returns a cons
  ;; cell in which the cdr is a flag indicating if the information is
  ;; exact (t) or approximate (nil).

  (let ((docstruct (symbol-value reftex-docstruct-symbol))
        (cnt 0) rtn
        found)
    (save-excursion
      (while (not rtn)
        (incf cnt)
        (setq found (re-search-backward reftex-everything-regexp nil t))
        (setq rtn
              (cond
               ((not found)
                ;; no match
                (or
                 (car (member (list 'bof (buffer-file-name)) docstruct))
                 (not (setq cnt 2))
                 (assq 'bof docstruct)  ;; for safety reasons
                 'corrupted))
               ((match-end 1)
                ;; Label
                (assoc (reftex-match-string 1)
                       (symbol-value reftex-docstruct-symbol)))
               ((match-end 3)
                ;; Section
                (goto-char (1- (match-beginning 3)))
                (let* ((list (member (list 'bof (buffer-file-name))
                                     docstruct))
                       (endelt (car (member (list 'eof (buffer-file-name))
                                            list)))
                       rtn1)
                  (while (and list (not (eq endelt (car list))))
                    (if (and (eq (car (car list)) 'toc)
                             (string= (buffer-file-name)
                                      (nth 3 (car list))))
                        (cond
                         ((equal (point)
                                 (or (and (markerp (nth 4 (car list)))
                                          (marker-position (nth 4 (car list))))
                                     (nth 8 (car list))))
                          ;; Fits with marker position or recorded position
                          (setq rtn1 (car list) list nil))
                         ((looking-at (reftex-make-regexp-allow-for-ctrl-m
                                       (nth 7 (car list))))
                          ;; Same title
                          (setq rtn1 (car list) list nil cnt 2))))
                    (pop list))
                  rtn1))
               ((match-end 7)
                ;; Input or include...
                (car
                 (member (list 'eof (reftex-find-tex-file
                                     (reftex-match-string 7)
                                      (cdr (assq 'master-dir docstruct))))
                         docstruct)))
               ((match-end 9)
                (assq 'appendix (symbol-value reftex-docstruct-symbol)))
               ((match-end 10)
                (save-excursion
                  (goto-char (match-end 10))
                  (assoc (reftex-no-props
                          (reftex-nth-arg-wrapper
                           (reftex-match-string 10)))
                         (symbol-value reftex-docstruct-symbol))))
               (t
                (error "This should not happen (reftex-where-am-I)"))))))
    (cons rtn (eq cnt 1))))

(defun reftex-label-location (&optional bound)
  "Return the environment or macro which determines the label type at point.
If optional BOUND is an integer, limit backward searches to that point."

  (let* ((loc1 (reftex-what-macro reftex-label-mac-list bound))
         (loc2 (reftex-what-environment reftex-label-env-list bound))
         (p1 (or (cdr loc1) 0))
         (p2 (or (cdr loc2) 0)))

    (setq reftex-location-start (max p1 p2))
    (if (>= p1 p2)
        (progn
          (setq reftex-default-context-position (+ p1 (length (car loc1))))
          (or (car loc1) "section"))
      (setq reftex-default-context-position (+ p2 8 (length (car loc2))))
      (or (car loc2) "section"))))

(defun reftex-parse-args (macro)
  ;; Return a list of macro name, nargs, arg-nr which is label and a list of
  ;; optional argument indices.
  (if (string-match "[[{]\\*?[]}]" macro)
      (progn
        (let ((must-match (substring macro 0 (match-beginning 0)))
              (args (substring macro (match-beginning 0)))
              opt-list nlabel (cnt 0))
          (while (string-match "\\`[[{]\\(\\*\\)?[]}]" args)
            (incf cnt)
            (when (eq ?\[ (string-to-char args))
              (push cnt opt-list))
            (when (and (match-end 1)
                       (not nlabel))
              (setq nlabel cnt))
            (setq args (substring args (match-end 0))))
          (list must-match cnt nlabel opt-list)))
    nil))

(defsubst reftex-move-to-next-arg (&optional ignore)
  ;; Assuming that we are at the end of a macro name or a macro argument,
  ;; move forward to the opening parenthesis of the next argument.
  ;; This function understands the splitting of macros over several lines
  ;; in TeX.
  (cond
   ;; Just to be quick:
   ((memq (following-char) '(?\[ ?\{)))
   ;; Do a search
   ((and reftex-allow-detached-macro-args
         (looking-at "[ \t]*[\n\r]?\\([ \t]*%[^\n\r]*[\n\r]\\)*[ \t]*[[{]"))
    (goto-char (1- (match-end 0)))
    t)
   (t nil)))

(defsubst reftex-move-to-previous-arg (&optional bound)
  ;; Assuming that we are in front of a macro argument,
  ;; move backward to the closing parenthesis of the previous argument.
  ;; This function understands the splitting of macros over several lines
  ;; in TeX.
  (cond
   ;; Just to be quick:
   ((memq (preceding-char) '(?\] ?\})))
   ;; Do a search
   ((and reftex-allow-detached-macro-args
         (re-search-backward
          "[]}][ \t]*[\n\r]?\\([ \t]*%[^\n\r]*[\n\r]\\)*[ \t]*\\=" bound t))
    (goto-char (1+ (match-beginning 0)))
    t)
   (t nil)))

(defun reftex-nth-arg-wrapper (key)
  (let ((entry (assoc key reftex-env-or-mac-alist)))
    (reftex-nth-arg (nth 5 entry) (nth 6 entry))))

(defun reftex-nth-arg (n &optional opt-args)
  ;; Return the nth following {} or [] parentheses content.
  ;; OPT-ARGS is a list of argument numbers which are optional.

  ;; If we are sitting at a macro start, skip to end of macro name.
  (and (eq (following-char) ?\\) (skip-chars-forward "a-zA-Z*\\\\"))

  (if (= n 1000)
      ;; Special case:  Skip all touching arguments
      (progn
        (reftex-move-over-touching-args)
        (reftex-context-substring))

    ;; Do the real thing.
    (let ((cnt 1))
      
      (when (reftex-move-to-next-arg)
        
        (while (< cnt n)
          (while (and (member cnt opt-args)
                      (eq (following-char) ?\{))
            (incf cnt))
          (when (< cnt n)
            (unless (and (condition-case nil
                             (or (forward-list 1) t)
                           (error nil))
                         (reftex-move-to-next-arg)
                         (incf cnt))
              (setq cnt 1000))))

        (while (and (memq cnt opt-args)
                    (eq (following-char) ?\{))
          (incf cnt)))
      (if (and (= n cnt)
               (> (skip-chars-forward "{\\[") 0))
          (reftex-context-substring)
        nil))))

(defun reftex-move-over-touching-args ()
  (condition-case nil
      (while (memq (following-char) '(?\[ ?\{))
        (forward-list 1))
    (error nil)))  

(defun reftex-context-substring ()
  ;; Return up to 100 chars from point
  ;; When point is just after a { or [, limit string to matching parenthesis
  (cond
   ((or (= (preceding-char) ?\{)
        (= (preceding-char) ?\[))
    ;; Inside a list - get only the list.
    (buffer-substring-no-properties
     (point)
     (min (+ (point) 150)
          (point-max)
          (condition-case nil
              (progn
                (up-list 1)
                (1- (point)))
            (error (point-max))))))
   (t
    ;; no list - just grab 100 characters
    (buffer-substring-no-properties (point) 
                                    (min (+ (point) 150) (point-max))))))

;; Variable holding the vector with section numbers
(defvar reftex-section-numbers [0 0 0 0 0 0 0 0])

(defun reftex-init-section-numbers (&optional toc-entry appendix)
  ;; Initialize the section numbers with zeros or with what is found
  ;; in the toc entry.
  (let* ((level  (or (nth 5 toc-entry) -1))
         (numbers (nreverse (split-string (or (nth 6 toc-entry) "") "\\.")))
         (depth (1- (length reftex-section-numbers)))
         (i depth) number-string)
    (while (>= i 0)
      (if (> i level)
          (aset reftex-section-numbers i 0)
        (setq number-string (or (car numbers) "0"))
        (if (string-match "\\`[A-Z]\\'" number-string)
            (aset reftex-section-numbers i
                  (- (string-to-char number-string) ?A -1))
            (aset reftex-section-numbers i (string-to-int number-string)))
        (pop numbers))
      (decf i)))
  (put 'reftex-section-numbers 'appendix appendix))

(defun reftex-section-number (&optional level star)
  ;; Return a string with the current section number.
  ;; When LEVEL is non-nil, increase section numbers on that level.
  (let* ((depth (1- (length reftex-section-numbers))) idx n (string "")
         (appendix (get 'reftex-section-numbers 'appendix)))
    (when level
      (when (and (> level -1) (not star))
        (aset reftex-section-numbers 
              level (1+ (aref reftex-section-numbers level))))
      (setq idx (1+ level))
      (when (not star)
        (while (<= idx depth)
          (aset reftex-section-numbers idx 0)
          (incf idx))))
    (setq idx 0)
    (while (<= idx depth)
      (setq n (aref reftex-section-numbers idx))
      (setq string (concat string (if (not (string= string "")) "." "")
                           (int-to-string n)))
      (incf idx))
    (save-match-data
      (if (string-match "\\`\\([@0]\\.\\)+" string)
          (setq string (replace-match "" nil nil string)))
      (if (string-match "\\(\\.0\\)+\\'" string)
          (setq string (replace-match "" nil nil string)))
      (if (and appendix
               (string-match "\\`[0-9]+" string))
          (setq string 
                (concat
                 (char-to-string
                  (1- (+ ?A (string-to-int (match-string 0 string)))))
                 (substring string (match-end 0))))))
    (if star
        (concat (make-string (1- (length string)) ?\ ) "*")
      string)))

(defun reftex-is-multi ()
  ;; Tell if this is a multifile document.  When not sure, say yes.
  (let ((entry (assq 'is-multi (symbol-value reftex-docstruct-symbol))))
    (if entry
        (nth 1 entry)
      t)))

(defun reftex-typekey-check (typekey conf-variable &optional n)
  ;; Check if CONF-VARIABLE is true or contains TYPEKEY
  (and n (setq conf-variable (nth n conf-variable)))
  (or (eq conf-variable t)
      (and (stringp conf-variable)
           (string-match (concat "[" conf-variable "]") typekey))))

(defun reftex-all-document-files (&optional relative)
  "Return a list of all files belonging to the current document.
When RELATIVE is non-nil, give file names relative to directory
of master file."
  (let* ((all (symbol-value reftex-docstruct-symbol))
         (master-dir (file-name-directory (reftex-TeX-master-file)))
         (re (concat "\\`" (regexp-quote master-dir)))
        file-list tmp file)
    (while (setq tmp (assoc 'bof all))
      (setq file (nth 1 tmp)
            all (cdr (memq tmp all)))
      (and relative
           (string-match re file)
           (setq file (substring file (match-end 0))))
      (push file file-list))
    (nreverse file-list)))

;;; Creating labels ---------------------------------------------------------

(defun reftex-label (&optional environment no-insert)
  "Insert a unique label.  Return the label.
If ENVIRONMENT is given, don't bother to find out yourself.
If NO-INSERT is non-nil, do not insert label into buffer.
With prefix arg, force to rescan document first.
When you are prompted to enter or confirm a label, and you reply with
just the prefix or an empty string, no label at all will be inserted.
A new label is also recorded into the label list.
This function is controlled by the settings of reftex-insert-label-flags."

  (interactive)

  ;; Ensure access to scanning info and rescan buffer if prefix are is '(4).
  (reftex-access-scan-info current-prefix-arg)

  ;; Find out what kind of environment this is and abort if necessary.
  (if (or (not environment)
          (not (assoc environment reftex-env-or-mac-alist)))
      (setq environment (reftex-label-location)))
  (unless environment
    (error "Can't figure out what kind of label should be inserted"))

  ;; Ok, go ahead.
  (catch 'exit
    (let* ((entry (assoc environment reftex-env-or-mac-alist))
           (typekey (nth 1 entry))
           (format (nth 3 entry))
           (macro-cell (reftex-what-macro 1))
           (entry1 (assoc (car macro-cell) reftex-env-or-mac-alist))
           label naked prefix valid default force-prompt rescan-is-useful)
      (when (and (or (nth 5 entry) (nth 5 entry1))
                 (memq (preceding-char) '(?\[ ?\{)))
        ;; This is an argument of a label macro.  Insert naked label.
        (setq naked t format "%s"))

      (setq prefix (or (cdr (assoc typekey reftex-typekey-to-prefix-alist))
                       (concat typekey "-")))
      ;; Replace any escapes in the prefix
      (setq prefix (reftex-replace-prefix-escapes prefix))

      ;; Make a default label.
      (cond

       ((reftex-typekey-check typekey (nth 0 reftex-insert-label-flags))
        ;; Derive a label from context.
        (setq reftex-active-toc (reftex-last-assoc-before-elt
                                 'toc (car (reftex-where-am-I))
                                 (symbol-value reftex-docstruct-symbol)))
        (setq default (reftex-no-props
                       (nth 2 (reftex-label-info " " nil nil t))))
        ;; Catch the cases where the is actually no context available.
        (if (or (string-match "NO MATCH FOR CONTEXT REGEXP" default)
                (string-match "ILLEGAL VALUE OF PARSE" default)
                (string-match "SECTION HEADING NOT FOUND" default)
                (string-match "HOOK ERROR" default)
                (string-match "^[ \t]*$" default))
            (setq default prefix
                  force-prompt t)       ; need to prompt
          (setq default 
                (concat prefix 
                        (funcall reftex-string-to-label-function default)))

          ;; Make it unique.
          (setq default (reftex-uniquify-label default nil "-"))))

       ((reftex-typekey-check typekey (nth 1 reftex-insert-label-flags))
        ;; Minimal default: the user will be prompted.
        (setq default prefix))

       (t
        ;; Make an automatic label.
        (setq default (reftex-uniquify-label prefix t))))

      ;; Should we ask the user?
      (if (or (reftex-typekey-check typekey
                                    (nth 1 reftex-insert-label-flags)) ; prompt
              force-prompt)

          (while (not valid)
            ;; iterate until we get a legal label

            (setq label (read-string
                         (if naked "Naked Label: " "Label: ")
                         default))

            ;; Lets make sure that this is a legal label
            (cond

             ((string-match (concat "\\`\\(" (regexp-quote prefix)
                                    "\\)?[ \t]*\\'")
                            label)
              ;; No label at all, please
              (message "No label inserted.")
              (throw 'exit nil))

             ;; Test if label contains strange characters
             ((string-match reftex-label-illegal-re label)
              (message "Label \"%s\" contains illegal characters" label)
              (ding)
              (sit-for 2))

             ;; Look it up in the label list
             ((setq entry (assoc label
                                 (symbol-value reftex-docstruct-symbol)))
              (ding)
              (if (y-or-n-p 
                   (format "Label '%s' exists. Use anyway? " label))
                  (setq valid t)))

             ;; Label is ok
             (t
              (setq valid t))))
        (setq label default))

      ;; Insert the label into the label list
      (let* ((here-I-am-info 
              (save-excursion
                (if (and (or naked no-insert) 
                         (integerp (cdr macro-cell)))
                    (goto-char (cdr macro-cell)))
                (reftex-where-am-I)))
             (here-I-am (car here-I-am-info))
             (note (if (cdr here-I-am-info)
                       ""
                     "POSITION UNCERTAIN.  RESCAN TO FIX."))
             (file (buffer-file-name))
             (text nil)
             (tail (memq here-I-am (symbol-value reftex-docstruct-symbol))))

        (or (cdr here-I-am-info) (setq rescan-is-useful t))

        (when tail
          (push (list label typekey text file nil note) (cdr tail))
          (put reftex-docstruct-symbol 'modified t)))

      ;; Insert the label into the buffer
      (unless no-insert
        (insert
         (if reftex-format-label-function
             (funcall reftex-format-label-function label format)
           (format format label)))
        (if (and reftex-plug-into-AUCTeX
                 (fboundp 'LaTeX-add-labels))
            ;; Tell AUCTeX about this
            (LaTeX-add-labels label)))

      ;; Delete the corresponding selection buffers to force update on next use.
      (when reftex-auto-update-selection-buffers
        (reftex-erase-buffer (reftex-make-selection-buffer-name typekey))
        (reftex-erase-buffer (reftex-make-selection-buffer-name " ")))

      (when (and rescan-is-useful reftex-allow-automatic-rescan)
        (reftex-parse-one))

      ;; return value of the function is the label
      label)))

(defun reftex-string-to-label (string)
  "Convert a string (a sentence) to a label.
Uses `reftex-derive-label-parameters' and `reftex-label-illegal-re'.  It
also applies `reftex-translate-to-ascii-function' to the string."
  (when (and reftex-translate-to-ascii-function
             (fboundp reftex-translate-to-ascii-function))
    (setq string (funcall reftex-translate-to-ascii-function string)))
  (apply 'reftex-convert-string string
         "[-~ \t\n\r,;]+" reftex-label-illegal-re nil nil
         reftex-derive-label-parameters))

(defun reftex-abbreviate-title (string)
  (reftex-convert-string string "[-~ \t\n\r,;]" nil t t
                         5 40 nil 1 " " (nth 5 reftex-derive-label-parameters)))

(defun reftex-convert-string (string split-re illegal-re dot keep-fp
                                     nwords maxchar illegal abbrev sep
                                     ignore-words &optional downcase)
  "Convert a string (a sentence) to something shorter.
SPLIT-RE     is the regular expression used to split the string into words.
ILLEGAL-RE   matches characters which are illegal in the final string.
DOT          t means add dots to abbreviated words.
KEEP-FP      t means to keep a final punctuation when applicable.
NWORDS       Number of words to use.
MAXCHAR      Maximum number of characters in the final string.
ILLEGAL      nil: Throw away any words containing stuff matched with ILLEGAL-RE.
             t:   Throw away only the matched part, not the whole word.
ABBREV       nil: Never abbreviate words.
             t:   Always abbreviate words (see `reftex-abbrev-parameters').
             not t and not nil: Abbreviate words if necessary to shorten
                                string below MAXCHAR.
SEP          String separating different words in the output string.
IGNORE-WORDS List of words which should be removed from the string."

  (let* ((words0 (split-string string (or split-re "[ \t\n\r]")))
         (reftex-label-illegal-re (or illegal-re "\000"))
         words word)

    ;; Remove words from the ignore list or with funny characters
    (while (setq word (pop words0))
      (if downcase (setq word (downcase word)))
      (cond
       ((member (downcase word) ignore-words))
       ((string-match reftex-label-illegal-re word)
        (when illegal
          (while (string-match reftex-label-illegal-re word)
            (setq word (replace-match "" nil nil word)))
          (push word words)))
       (t
        (push word words))))
    (setq words (nreverse words))

    ;; Restrict number of words
    (if (> (length words) nwords)
        (setcdr (nthcdr (1- nwords) words) nil))
    
    ;; First, try to use all words
    (setq string (mapconcat 'identity words sep))
  
    ;; Abbreviate words if enforced by user settings or string length
    (if (or (eq t abbrev)
            (and abbrev
                 (> (length string) maxchar)))
        (setq words
              (mapcar
               (function
                (lambda (w) (if (string-match reftex-abbrev-regexp w)
                                (if dot
                                    (concat (match-string 1 w) ".")
                                  (match-string 1 w))
                              w)))
               words)
              string (mapconcat 'identity words sep)))

    ;; Shorten if still to long
    (setq string
          (if (> (length string) maxchar)
              (substring string 0 maxchar)
            string))

    ;; Delete the final punctuation, if any
    (if (and (not keep-fp) (string-match "\\s.+\\'" string))
        (setq string (replace-match "" nil nil string)))
    string))

(defun reftex-latin1-to-ascii (string)
  ;; Translate the upper 127 chars in the ISO1 charset to ASCII equivalents
  (let ((tab "@@@@@@@@@@@@@@@@@@'@@@@@@@@@@@@@ icLxY|S\"ca<--R-o|23'uq..1o>423?AAAAAAACEEEEIIIIDNOOOOOXOUUUUYP3aaaaaaaceeeeiiiidnooooo:ouuuuypy") c)
    (loop for i from 0 to (1- (length string)) do
          (setq c (aref string i))
          (cond ((and (> c 127) (< c 256))                 ; 8 bit Latin-1
                 (aset string i (aref tab (- c 128))))
                ((and (> c 2175) (< c 2304))               ; Mule Latin-1,
                 (aset string i (aref tab (- c 2176))))))  ; Std. Emacs only
    string))

(defun reftex-replace-prefix-escapes (prefix)
  ;; Replace %escapes in a label prefix
  (save-match-data
    (let (letter (num 0) replace)
      (while (string-match "\\%\\([a-zA-Z]\\)" prefix num)
        (setq letter (match-string 1 prefix))
        (setq replace
              (cond
               ((equal letter "f")
                (file-name-sans-extension
                 (file-name-nondirectory (buffer-file-name))))
               ((equal letter "F")
                (let ((masterdir (file-name-directory (reftex-TeX-master-file)))
                      (file (file-name-sans-extension (buffer-file-name))))
                  (if (string-match (concat "\\`" (regexp-quote masterdir))
                                    file)
                      (substring file (length masterdir))
                    file)))
               ((equal letter "u")
                (or (user-login-name) ""))
               (t "")))
        (setq num (1- (+ (match-beginning 1) (length replace)))
              prefix (replace-match replace nil nil prefix)))
      prefix)))

(defun reftex-uniquify-label (label &optional force separator)
  ;; Make label unique by appending a number.
  ;; Optional FORCE means, force appending a number, even if label is unique.
  ;; Optional SEPARATOR is a string to stick between label and number.

  ;; Ensure access to scanning info
  (reftex-access-scan-info)

  (cond
   ((and (not force)
         (not (assoc label (symbol-value reftex-docstruct-symbol))))
    label)
   (t
    (let* ((label-numbers (assq 'label-numbers
                                (symbol-value reftex-docstruct-symbol)))
           (label-numbers-alist (cdr label-numbers))
           (cell (or (assoc label label-numbers-alist)
                     (car (setcdr label-numbers
                                  (cons (cons label 0)
                                        label-numbers-alist)))))
           (num (1+ (cdr cell)))
           (sep (or separator "")))
      (while (assoc (concat label sep (int-to-string num))
                    (symbol-value reftex-docstruct-symbol))
        (incf num))
      (setcdr cell num)
      (concat label sep (int-to-string num))))))

;;; Referencing labels ------------------------------------------------------

;; Help string for the reference label menu
(defconst reftex-select-label-prompt
  "Select: [n]ext [p]revious [r]escan [ ]context e[x]tern [q]uit RET [?]HELP+more")

(defconst reftex-select-label-help
  " n / p      Go to next/previous label (Cursor motion works as well)
 C-c C-n/p  Go to next/previous section heading.
 b / l      Jump back to previous selection / Reuse last referenced label
 C-s / C-r  Search forward/backward.  Use repeated C-s/C-r as in isearch.
 g / s      Update menu      / Switch label type
 r / R      Reparse document / Reparse entire document
 x          Switch to label menu of external document (with LaTeX package `xr')
 t i c # %  Toggle: [i]ncl. file borders, [t]able of contents,  [c]ontext
                    [#] label counters,   [%] labels in comments
 SPC / f    Show full context in other window / Toggle follow mode
 v   / .    Toggle \\ref <-> \\vref / Show insertion point in other window
 TAB        Enter a label with completion
 q / RET    Quit without referencing / Accept current label (also on mouse-2)")

(defvar reftex-select-label-map nil
  "Keymap used for *RefTeX Select* buffer, when selecting a label.
This keymap can be used to configure the label selection process which is
started with the command \\[reftex-reference].")

(defun reftex-select-label-mode ()
  "Major mode for selecting a label in a LaTeX document.
This buffer was created with RefTeX.
It only has a meaningful keymap when you are in the middle of a 
selection process.
To select a label, move the cursor to it and press RET.
Press `?' for a summary of important key bindings.

During a selection process, these are the local bindings.

\\{reftex-select-label-map}"

  (interactive)
  (kill-all-local-variables)
  (make-local-hook 'pre-command-hook)
  (make-local-hook 'post-command-hook)
  (setq major-mode 'reftex-select-label-mode
        mode-name "RefTeX Select Label")
  (when (syntax-table-p reftex-latex-syntax-table)
    (set-syntax-table reftex-latex-syntax-table))
  ;; We do not set a local map - reftex-select-item does this.
  (run-hooks 'reftex-select-label-mode-hook))

(defun reftex-reference (&optional type no-insert cut)
  "Make a LaTeX reference.  Look only for labels of a certain TYPE.
With prefix arg, force to rescan buffer for labels.  This should only be
necessary if you have recently entered labels yourself without using
reftex-label.  Rescanning of the buffer can also be requested from the
label selection menu.
The function returns the selected label or nil.
If NO-INSERT is non-nil, do not insert \\ref command, just return label.
When called with 2 C-u prefix args, disable magic word recognition."

  (interactive)

  ;; check for active recursive edits
  (reftex-check-recursive-edit)

  ;; Ensure access to scanning info and rescan buffer if prefix are is '(4)
  (reftex-access-scan-info current-prefix-arg)

  (unless type
    ;; guess type from context
    (if (and reftex-guess-label-type
             (setq type (reftex-guess-label-type)))
        (setq cut (cdr type)
              type (car type))
      (setq type (reftex-query-label-type))))

  (let* ((varioref (if (reftex-typekey-check 
                        type reftex-vref-is-default)
                       "\\vref" "\\ref"))
         (form "\\ref{%s}")
         label pair)

    ;; Have the user select a label
    (set-marker reftex-select-return-marker (point))
    (setq pair (save-excursion
                 (reftex-offer-label-menu type)))
    (reftex-ensure-compiled-variables)
    (set-marker reftex-select-return-marker nil)
    (setq label (car pair)
          type  (cdr pair)
          form (or (cdr (assoc type reftex-typekey-to-format-alist))
                   form))

    (if (and label
             (not no-insert))
        (progn
          (if cut (backward-delete-char cut))

          ;; remove ~ if we do already have a space
          (when (and (= ?~ (string-to-char form))
                     (member (preceding-char) '(?\ ?\t ?\n)))
            (setq form (substring form 1)))
          ;; do we need to switch from \ref to \vref?
          (when (string= varioref "\\vref")
            (while (string-match "\\\\ref{" form)
              (setq form (replace-match "\\vref{" t t form))))
          ;; ok, insert the reference
          (insert
           (if reftex-format-ref-function
               (funcall reftex-format-ref-function label form)
             (format form label label)))
          (message ""))
      (message "Quit"))
    ;; return the label
    label))

(defun reftex-guess-label-type ()
  ;; Examine context to guess what a \ref might want to reference.
  (let ((words reftex-words-to-typekey-alist)
        (case-fold-search t)
        (bound (max (point-min) (- (point) 35)))
        matched cell)
    (save-excursion
      (while (and (setq cell (pop words))
                  (not (setq matched 
                             (re-search-backward (car cell) bound t))))))
    (if matched
        (cons (cdr cell) (- (match-end 0) (match-end 1)))
      nil)))

(defun reftex-offer-label-menu (typekey)
  ;; Offer a menu with the appropriate labels.  Return (label . typekey).
  (let* ((buf (current-buffer))
         (xr-data (assq 'xr (symbol-value reftex-docstruct-symbol)))
         (xr-alist (cons (cons "" (buffer-file-name)) (nth 1 xr-data)))
         (xr-index 0)
         (here-I-am (car (reftex-where-am-I)))
         (here-I-am1 here-I-am)
         (toc (reftex-typekey-check typekey reftex-label-menu-flags 0))
         (files (reftex-typekey-check typekey reftex-label-menu-flags 7))
         (context (not (reftex-typekey-check
                        typekey reftex-label-menu-flags 3)))
         (counter (reftex-typekey-check
                   typekey reftex-label-menu-flags 2))
         (follow  (reftex-typekey-check
                   typekey reftex-label-menu-flags 4))
         (commented (nth 5 reftex-label-menu-flags))
         (prefix "")
         selection-buffers
         offset rtn key data last-data entry)

    (setq entry (cons nil nil))

    (unwind-protect
        (catch 'exit
          (while t
            (save-window-excursion
              (delete-other-windows)
              (setq reftex-call-back-to-this-buffer buf
                    reftex-latex-syntax-table (syntax-table))
              (let ((default-major-mode 'reftex-select-label-mode))
                (if reftex-use-multiple-selection-buffers
                    (switch-to-buffer-other-window
                     (save-excursion
                       (set-buffer buf)
                       (reftex-make-selection-buffer-name typekey)))
                  (switch-to-buffer-other-window "*RefTeX Select*")
                  (reftex-erase-buffer)))
              (unless (eq major-mode 'reftex-select-label-mode)
                (reftex-select-label-mode))
              (add-to-list 'selection-buffers (current-buffer))
              (setq truncate-lines t)
              (setq mode-line-format
                    (list "----  " 'mode-line-buffer-identification
                          "   " 'varioref
                          "   " (abbreviate-file-name
                                 (buffer-file-name buf))
                          " -%-"))
              (cond
               ((= 0 (buffer-size))
                (let ((buffer-read-only nil))
                  (setq offset (reftex-make-and-insert-label-list
                                typekey buf toc files context counter commented
                                (or here-I-am offset) prefix))))
               (here-I-am
                (setq offset (reftex-get-offset buf here-I-am typekey)))
               (t (setq offset t)))
              (setq buffer-read-only t)
              (setq offset (or offset t))

              (setq here-I-am nil) ; turn off determination of offset
              (setq rtn
                    (reftex-select-item
                     reftex-select-label-prompt
                     reftex-select-label-help
                     reftex-select-label-map
                     offset
                     'reftex-select-label-callback follow))
              (setq key       (car rtn)
                    data      (nth 1 rtn)
                    last-data (nth 2 rtn)
                    offset    t)
              (unless key (throw 'exit nil))
              (cond
               ((eq key ?g)
                ;; update buffer
                (reftex-erase-buffer))
               ((or (eq key ?r)
                    (eq key ?R))
                ;; rescan buffer
                (reftex-erase-buffer)
                (reftex-reparse-document buf last-data key))
               ((eq key ?c)
                ;; toggle context mode
                (reftex-erase-buffer)
                (setq context (not context)))
               ((eq key ?s)
                ;; switch type
                (setq here-I-am here-I-am1)
                (setq typekey (reftex-query-label-type)))
               ((eq key ?t)
                ;; toggle table of contents display
                (reftex-erase-buffer)
                (setq toc (not toc)))
               ((eq key ?i)
                ;; toggle display of included file borders
                (reftex-erase-buffer)
                (setq files (not files)))
               ((eq key ?#)
                ;; toggle counter display
                (reftex-erase-buffer)
                (setq counter (not counter)))
               ((eq key ?%)
                ;; toggle display of commented labels
                (reftex-erase-buffer)
                (setq commented (not commented)))
               ((eq key ?l)
                ;; reuse the last referenced label again
                (setq entry reftex-last-used-reference)
                (throw 'exit t))
               ((eq key ?x)
                ;; select an external document
                (setq xr-index (reftex-select-external-document
                                xr-alist xr-index))
                (setq buf (or (reftex-get-file-buffer-force
                               (cdr (nth xr-index xr-alist)))
                              (error "Cannot switch document"))
                      prefix (or (car (nth xr-index xr-alist)) ""))
                (set-buffer buf)
                (reftex-access-scan-info))
               ((stringp key)
                (setq entry 
                      (or (assoc key (symbol-value reftex-docstruct-symbol))
                          (list key typekey)))
                (throw 'exit t))
               (t
                (set-buffer buf)
                (if data
                    (progn
                      (setq entry data)
                      (setq reftex-last-used-reference entry))
                  (setq entry nil))
                (throw 'exit t))))))
      (save-excursion
        (while reftex-buffers-with-changed-invisibility
          (set-buffer (car (car reftex-buffers-with-changed-invisibility)))
          (setq buffer-invisibility-spec 
                (cdr (pop reftex-buffers-with-changed-invisibility)))))
      (mapcar (function (lambda (buf) 
                          (and (buffer-live-p buf)
                               (bury-buffer buf))))                        
              selection-buffers)
      (reftex-kill-temporary-buffers))
    (cons (if (nth 0 entry) (concat prefix (nth 0 entry)) nil)
          (nth 1 entry))))

(defun reftex-select-external-document (xr-alist xr-index)
  ;; Return index of an external document.
  (let* ((len (length xr-alist)) (highest (1- (+ ?0 len)))
         (prompt (format "[%c-%c] Select    TAB: Read prefix with completion" 
                         ?0 highest))
         key prefix)
    (cond
     ((= len 1)
      (message "No external documents available")
      (ding) (sit-for 1) 0)
     ((= len 2)
      (- 1 xr-index))
     (t
      (save-excursion
        (let* ((length (apply 'max (mapcar 
                                    (lambda(x) (length (car x))) xr-alist)))
               (fmt (format " [%%c]  %%-%ds  %%s\n" length))
               (n (1- ?0)))
          (setq key
                (reftex-select-with-char
                 prompt
                 (concat
                  "SELECT EXTERNAL DOCUMENT\n------------------------\n"
                  (mapconcat
                   (function
                    (lambda (x) 
                      (format fmt (incf n) (or (car x) "")
                              (abbreviate-file-name (cdr x)))))
                   xr-alist ""))
                 nil t))
          (cond
           ((and (>= key ?0) (<= key highest)) (- key ?0))
           ((= key ?\C-i)
            (setq prefix (completing-read "Prefix: " xr-alist nil t))
            (- len (length (memq (assoc prefix xr-alist) xr-alist))))
           (t (error "Illegal document selection [%c]" key)))))))))

(defun reftex-reparse-document (&optional buffer data key)
  ;; Rescan the document.
  (save-window-excursion
    (save-excursion
      (if buffer
          (if (not (bufferp buffer))
              (error "No such buffer %s" (buffer-name buffer))
            (set-buffer buffer)))
      (let ((arg (if (eq key ?R) '(16) '(4)))
            (file (nth 3 data)))
        (reftex-access-scan-info arg file)))))

(defun reftex-make-selection-buffer-name (type &optional index)
  ;; Make unique name for a selection buffer.
  (format " *RefTeX[%s][%d]*"
          type (or index (get reftex-docstruct-symbol ':master-index) 0)))

(defun reftex-get-offset (buf here-am-I typekey)
  ;; Find the correct offset data, like make-and-insert would, but faster.
  (save-excursion
    (set-buffer buf)
    (reftex-access-scan-info)
    (let* ((rest (memq here-am-I (symbol-value reftex-docstruct-symbol)))
           entry)
      (while (and (setq entry (pop rest))
                  (not (and (stringp (car entry))
                            (equal typekey (nth 1 entry))))))
      entry)))

(defun reftex-make-and-insert-label-list
  (typekey0 buf toc files context counter show-commented here-I-am xr-prefix)
  ;; Insert a menu of all labels in buffer BUF into current buffer.
  ;; Return the data property of the entry corresponding to HERE-I-AM.
  (let* ((font (reftex-use-fonts))
         (cnt 0)
         (index -1)
         (toc-indent " ")
         (label-indent
          (concat "> "
                  (if toc (make-string (* 7 reftex-level-indent) ?\ ) "")))
         (context-indent
          (concat ".   "
                  (if toc (make-string (* 7 reftex-level-indent) ?\ ) "")))
         (mouse-face
          (if (memq reftex-highlight-selection '(mouse both))
              reftex-mouse-selected-face
            nil))
         (label-face (reftex-verified-face reftex-label-face
                                           'font-lock-constant-face
                                           'font-lock-reference-face))
         all cell text label typekey note comment master-dir-re
         offset from to docstruct-symbol)

    (message "Creating Selection Buffer...")

    ;; Pop to buffer buf to get the correct buffer-local variables
    (save-excursion
      (set-buffer buf)

      ;; Ensure access to scanning info
      (reftex-access-scan-info)

      (setq docstruct-symbol reftex-docstruct-symbol
            all (symbol-value reftex-docstruct-symbol)
            reftex-active-toc nil
            master-dir-re
            (concat "\\`" (regexp-quote
                           (file-name-directory (reftex-TeX-master-file))))))

    (set (make-local-variable 'reftex-docstruct-symbol) docstruct-symbol)
    (set (make-local-variable 'reftex-prefix)
         (cdr (assoc typekey0 reftex-typekey-to-prefix-alist)))
    (if (equal reftex-prefix " ") (setq reftex-prefix nil))

    ;; Walk the docstruct and insert the appropriate stuff
    (while (setq cell (pop all))

      (incf index)
      (setq from (point))

      (if (eq cell here-I-am) (setq offset 'attention))

      (cond

       ((memq (car cell) '(bib thebib label-numbers appendix
                               master-dir bibview-cache is-multi xr xr-doc)))
       ;; These are currently ignored

       ((memq (car cell) '(bof eof file-error))
        ;; Beginning or end of a file
        (when files
          (insert
           " File " (if (string-match master-dir-re (nth 1 cell))
                   (substring (nth 1 cell) (match-end 0))
                 (nth 1 cell))
           (cond ((eq (car cell) 'bof) " starts here\n")
                 ((eq (car cell) 'eof) " ends here\n")
                 ((eq (car cell) 'file-error) " was not found\n")))
          (when font
            (put-text-property from (point)
                               'face reftex-file-boundary-face))))

       ((eq (car cell) 'toc)
        ;; a table of contents entry
        (when toc
          (setq reftex-active-toc cell)
          (insert (concat toc-indent (nth 2 cell) "\n"))
          (setq to (point))
          (when font
            (put-text-property from to
                               'face reftex-section-heading-face))
          (goto-char to)))

       ((stringp (car cell))
        ;; a label
        (when (null (nth 2 cell))
          ;; No context yet.  Quick update.
          (setcdr cell (cdr (reftex-label-info-update cell)))
          (put docstruct-symbol 'modified t))

        (setq label   (car cell)
              typekey (nth 1 cell)
              text    (nth 2 cell)
              comment (nth 4 cell)
              note    (nth 5 cell))

        (when (and (or (string= typekey typekey0) (string= typekey0 " "))
                   (or show-commented (null comment)))

          ;; Yes we want this one
          (incf cnt)
          (if (eq offset 'attention) (setq offset cell))

          (setq label (concat xr-prefix label))
          (when comment (setq label (concat "% " label)))
          (insert label-indent label)
          (when font
            (setq to (point))
            (put-text-property
             (- (point) (length label)) to
             'face (if comment
                       'font-lock-comment-face
                     label-face))
            (goto-char to))

          (insert (if counter (format " (%d) " cnt) "")
                  (if comment " LABEL IS COMMENTED OUT " "")
                  (if (stringp note) (concat "  " note) "")
                  "\n")
          (setq to (point))

          (when context
            (insert context-indent text "\n")
            (setq to (point)))
          (put-text-property from to ':data cell)
          (when mouse-face
            (put-text-property from (1- to)
                               'mouse-face mouse-face))   
          (goto-char to)))))

    (when (reftex-refontify)
      (reftex-fontify-select-label-buffer buf))
    (run-hooks 'reftex-display-copied-context-hook)
    offset))

(defun reftex-query-label-type ()
  ;; Ask for label type
  (let ((key (reftex-select-with-char 
              reftex-type-query-prompt reftex-type-query-help 3)))
    (unless (member (char-to-string key) reftex-typekey-list)
      (error "No such label type: %s" (char-to-string key)))
    (char-to-string key)))

(defun reftex-select-label-callback (data forward no-revisit)
  ;; Callback function called from the label selection in order to
  ;; show context in another window
  (let* ((this-window (selected-window))
         label file buffer re found)
    ;; pop to original buffer in order to get correct variables
    (catch 'exit
      (setq label (nth 0 data)
            file  (nth 3 data))

      ;; goto the file in another window
      (setq buffer 
            (if no-revisit
                (reftex-get-buffer-visiting file)
              (reftex-get-file-buffer-force
               file (not reftex-keep-temporary-buffers))))
      (if buffer
          ;; good - the file is available
          (switch-to-buffer-other-window buffer)
        ;; we have got a problem here.  The file does not exist.
        ;; Let' get out of here..
        ;; (ding)
        (message reftex-no-follow-message)
        (throw 'exit nil))

      ;; search for that label
      (setq re (format reftex-find-label-regexp-format (regexp-quote label)))
      (setq found
            (if forward
                (re-search-forward re nil t)
              (re-search-backward re nil t)))
      (unless found
        (goto-char (point-min))
        (unless (re-search-forward re nil t)
          ;; Ooops.  Must be in a macro with distributed args.
          (re-search-forward (format reftex-find-label-regexp-format2
                                     (regexp-quote label)) nil t)))
      (when (match-end 3)
        (setq reftex-latex-syntax-table (syntax-table))
        (reftex-highlight 0 (match-beginning 3) (match-end 3))
        (reftex-show-entry (match-beginning 3) (match-end 3))
        (recenter '(4)))
      (select-window this-window))))

(defun reftex-pop-to-label (label file-list &optional mark-to-kill highlight)
  ;; Find LABEL in any file in FILE-LIST in another window.
  ;; If mark-to-kill is non-nil, mark new buffer for killing.
  ;; If HIGHLIGHT is non-nil, highlight the label definition.
  (let* ((re1 (format reftex-find-label-regexp-format (regexp-quote label)))
         (re2 (format reftex-find-label-regexp-format2 (regexp-quote label)))
         (re-list (list re1 re2)) re
         (file-list-1 file-list)
         file buf)
    (catch 'exit
      (while (setq re (pop re-list))
        (setq file-list file-list-1)
        (while (setq file (pop file-list))
          (unless (setq buf (reftex-get-file-buffer-force file mark-to-kill))
            (error "No such file %s" file))
          (set-buffer buf)
          (widen)
          (goto-char (point-min))
          (when (re-search-forward re nil t)
            (switch-to-buffer-other-window buf)
            (goto-char (match-beginning 0))
            (recenter '(4))
            (if highlight
                (reftex-highlight 0 (match-beginning 3) (match-end 3)))
            (throw 'exit (selected-window)))))
      (error "Label %s not found" label))))

(defun reftex-show-entry (beg-hlt end-hlt)
  ;; Show entry if point is hidden
  (let* ((n (/ (window-height) 2))
         (beg (save-excursion
               (re-search-backward "[\n\r]" nil 1 n) (point)))
         (end (save-excursion
                (re-search-forward  "[\n\r]" nil 1 n) (point))))
    (cond
     ((and (boundp 'buffer-invisibility-spec) buffer-invisibility-spec
           (get-char-property (1+ beg-hlt) 'invisible))
      ;; Invisible with text properties.  That is easy to change.
      (push (cons (current-buffer) buffer-invisibility-spec)
            reftex-buffers-with-changed-invisibility)
      (setq buffer-invisibility-spec nil))
     ((string-match "\r" (buffer-substring beg end))
      ;; Invisible with selective display.  We need to copy it.
      (let ((string (buffer-substring-no-properties beg end)))
        (switch-to-buffer "*RefTeX Context Copy*")
        (setq buffer-read-only nil)
        (erase-buffer)
        (insert string)
        (subst-char-in-region (point-min) (point-max) ?\r ?\n t)
        (goto-char (- beg-hlt beg))
        (reftex-highlight 0 (1+ (- beg-hlt beg)) (1+ (- end-hlt beg)))
        (if (reftex-refontify)
            (when (or (not (eq major-mode 'latex-mode))
                      (not font-lock-mode))
              (latex-mode)
              (run-hook-with-args 
               'reftex-pre-refontification-functions
               reftex-call-back-to-this-buffer 'reftex-hidden)
              (turn-on-font-lock))
          (when (or (not (eq major-mode 'fundamental-mode))
                    font-lock-mode)
            (fundamental-mode)))
        (run-hooks 'reftex-display-copied-context-hook)
        (setq buffer-read-only t))))))

;;; =========================================================================
;;;
;;; Table of contents

;; We keep at most one *toc* buffer - it is easy to make them

(defvar reftex-toc-map (make-sparse-keymap)
  "Keymap used for *toc* buffer.")

(defun reftex-toc-mode ()
  "Major mode for managing Table of Contents for LaTeX files.
This buffer was created with RefTeX.
Press `?' for a summary of important key bindings.

Here are all local bindings.

\\{reftex-toc-map}"
  (interactive)
  (kill-all-local-variables)
  (setq major-mode 'reftex-toc-mode
        mode-name "RefTeX Table of Contents")
  (use-local-map reftex-toc-map)
  (set (make-local-variable 'revert-buffer-function) 'reftex-toc-revert)
  (setq truncate-lines t)
  (make-local-hook 'post-command-hook)
  (make-local-hook 'pre-command-hook)
  (make-local-variable 'reftex-last-follow-point)
  (add-hook 'post-command-hook 'reftex-toc-post-command-hook nil t)
  (add-hook 'pre-command-hook  'reftex-toc-pre-command-hook nil t)
  (run-hooks 'reftex-toc-mode-hook))

(defvar reftex-last-toc-master nil
  "Stores the name of the tex file that `reftex-toc' was last run on.")

(defvar reftex-last-toc-file nil
  "Stores the file name from which `reftex-toc' was called.  For redo command.")

(defvar reftex-last-window-height nil)

(defvar reftex-toc-return-marker (make-marker)
  "Marker which makes it possible to return from toc to old position.")

(defconst reftex-toc-help
"                      AVAILABLE KEYS IN TOC BUFFER
                      ============================
n / p   next-line / previous-line
SPC     Show the corresponding section of the LaTeX document.
TAB     Goto the section.
RET     Goto the section and hide the *toc* buffer (also on mouse-2).
q / Q   Hide/Kill *toc* buffer, return to position of last reftex-toc command.
f / g   Toggle follow mode on and off / Refresh *toc* buffer.
r / R   Reparse the LaTeX document / Reparse entire LaTeX document.
.       In other window, show position from where `reftex-toc' was called.
x       Switch to TOC of external document (with LaTeX package `xr').")

(defun reftex-toc ()
  "Show the table of contents for the current document.
When called with a raw C-u prefix, rescan the document first."

  (interactive)

  (if (or (not (string= reftex-last-toc-master (reftex-TeX-master-file)))
          current-prefix-arg)
      (reftex-erase-buffer "*toc*"))

  (setq reftex-last-toc-file   (buffer-file-name))
  (setq reftex-last-toc-master (reftex-TeX-master-file))

  (set-marker reftex-toc-return-marker (point))

  ;; If follow mode is active, arrange to delay it one command
  (if reftex-toc-follow-mode
      (setq reftex-toc-follow-mode 1))

  ;; Ensure access to scanning info and rescan buffer if prefix are is '(4)
  (reftex-access-scan-info current-prefix-arg)

  (let* ((all   (symbol-value reftex-docstruct-symbol))
         (xr-data (assq 'xr all))
         (xr-alist (cons (cons "" (buffer-file-name)) (nth 1 xr-data)))
         (where (reftex-nearest-section))
         (mouse-face
          (if (memq reftex-highlight-selection '(mouse both))
              reftex-mouse-selected-face
            nil))
         (fontify (reftex-use-fonts))
         toc1 cell startpos)

    (if (get-buffer-window "*toc*")
        (select-window (get-buffer-window "*toc*"))
      (when (< (window-height) (* 2 window-min-height))
        (delete-other-windows))
      (setq reftex-last-window-height (window-height))  ; remember
      (split-window)
      (let ((default-major-mode 'reftex-toc-mode))
        (switch-to-buffer "*toc*")))

    (or (eq major-mode 'reftex-toc-mode) (reftex-toc-mode))

    (cond
     ;; buffer is empty - fill it with the table of contents
     ((= (buffer-size) 0)
      (message "Building *toc* buffer...")

      (setq buffer-read-only nil)
      (insert (format
"TABLE-OF-CONTENTS on %s
SPC=view TAB=goto RET=goto+hide [q]uit [r]escan [f]ollow-mode e[x]tern [?]Help
-------------------------------------------------------------------------------
" (abbreviate-file-name reftex-last-toc-master)))
      (setq startpos (point))

      (if (reftex-use-fonts)
          (put-text-property 1 (point) 'face reftex-toc-header-face))
      (put-text-property 1 (point) 'intangible t)
      (put-text-property 1 2 'xr-alist xr-alist)

      (while all
        (setq cell (car all)
              all  (cdr all))
        (when (eq (car cell) 'toc)
          (setq toc1 (concat (nth 2 cell) "\n"))
          (put-text-property 0 (length toc1) 'toc cell toc1)
          (when fontify
            (put-text-property 0 (length toc1)
                               'face reftex-section-heading-face toc1))
          (when mouse-face
            (put-text-property 0 (1- (length toc1))
                               'mouse-face mouse-face toc1))
          (insert toc1)))

      (backward-delete-char 1)

      (run-hooks 'reftex-display-copied-context-hook)
      (message "Building *toc* buffer...done.")
      (setq buffer-read-only t))
     (t
      (goto-line 3)
      (beginning-of-line)
      (setq startpos (point))))

    ;; Find the correct section
    (goto-char (point-max))
    (beginning-of-line)
    (while (and (> (point) startpos)
                (not (eq (get-text-property (point) 'toc) where)))
      (beginning-of-line 0))
    (setq reftex-last-follow-point (point))))

(defun reftex-nearest-section ()
  ;; Return (file . find) of nearest section command
  (let* ((here-I-am (car (reftex-where-am-I))))
    (reftex-last-assoc-before-elt
     'toc here-I-am (symbol-value reftex-docstruct-symbol))))

(defun reftex-toc-pre-command-hook ()
  ;; used as pre command hook in *toc* buffer
  (reftex-unhighlight 0)
  (reftex-unhighlight 1))

(defun reftex-toc-post-command-hook ()
  ;; used in the post-command-hook for the *toc* buffer
  (and (> (point) 1)
       (memq reftex-highlight-selection '(cursor both))
       (save-excursion
         (reftex-highlight 1
                          (progn (beginning-of-line) (point))
                          (progn (end-of-line) (point)))))
  (cond
   ((integerp reftex-toc-follow-mode)
    ;; remove delayed action
    (setq reftex-toc-follow-mode t))
   ((and reftex-toc-follow-mode
         (not (equal reftex-last-follow-point (point))))
    ;; show context in other window
    (setq reftex-last-follow-point (point))
    (condition-case nil
        (reftex-toc-visit-line nil (not reftex-revisit-to-follow))
      (error t)))))

(defun reftex-re-enlarge ()
  ;; Enlarge windiw to a remembered size
  (enlarge-window
   (max 0 (- (or reftex-last-window-height (window-height))
             (window-height)))))

(defun reftex-toc-show-help ()
  "Show a summary of special key bindings."
  (interactive)
  (with-output-to-temp-buffer "*RefTeX Help*"
    (princ reftex-toc-help))
  ;; If follow mode is active, arrange to delay it one command
  (if reftex-toc-follow-mode
      (setq reftex-toc-follow-mode 1)))

(defun reftex-toc-toggle-follow ()
  "Toggle toc-follow mode. (It is not really a mode, just a flag)."
  (interactive)
  (setq reftex-last-follow-point -1)
  (setq reftex-toc-follow-mode (not reftex-toc-follow-mode)))
(defun reftex-toc-view-line ()
  "View document location in other window."
  (interactive)
  (reftex-toc-visit-line))
(defun reftex-toc-mouse-view-line (ev)
  "View document location in other window."
  (interactive "e")
  (mouse-set-point ev)
  (reftex-toc-visit-line))
(defun reftex-toc-goto-line-and-hide ()
  "Go to document location in other window.  Hide the *toc* window."
  (interactive)
  (reftex-toc-visit-line 'hide))
(defun reftex-toc-goto-line ()
  "Go to document location in other window.  Hide the *toc* window."
  (interactive)
  (reftex-toc-visit-line t))
(defun reftex-toc-mouse-goto-line-and-hide (ev)
  "Go to document location in other window.  Hide the *toc* window."
  (interactive "e")
  (mouse-set-point ev)
  (reftex-toc-visit-line 'hide))
(defun reftex-toc-show-insertion-point ()
  (interactive)
  (let ((this-window (selected-window)))
    (unwind-protect
        (progn
          (switch-to-buffer-other-window
           (marker-buffer reftex-toc-return-marker))
          (goto-char (marker-position reftex-toc-return-marker))
          (recenter '(4)))
      (select-window this-window))))
(defun reftex-toc-quit ()
  "Hide the *toc* window and do not move point."
  (interactive)
  (or (one-window-p) (delete-window))
  (switch-to-buffer (marker-buffer reftex-toc-return-marker))
  (reftex-re-enlarge)
  (goto-char (or (marker-position reftex-toc-return-marker) (point))))
(defun reftex-toc-quit-and-kill ()
  "Kill the *toc* buffer."
  (interactive)
  (kill-buffer "*toc*")
  (or (one-window-p) (delete-window))
  (switch-to-buffer (marker-buffer reftex-toc-return-marker))
  (reftex-re-enlarge)
  (goto-char (marker-position reftex-toc-return-marker)))
(defun reftex-toc-rescan (&rest ignore)
  "Regenerate the *toc* buffer by reparsing file of section at point."
  (interactive)
  (if reftex-enable-partial-scans
      (let ((file (nth 3 (get-text-property (point) 'toc))))
        (if (not file)
            (error "Don't know which file to rescan.  Try `R'")
          (switch-to-buffer-other-window
           (reftex-get-file-buffer-force file))
          (setq current-prefix-arg '(4))
          (reftex-toc)))
    (reftex-toc-Rescan))
  (reftex-kill-temporary-buffers))
(defun reftex-toc-Rescan (&rest ignore)
  "Regenerate the *toc* buffer by reparsing the entire document."
  (interactive)
  (switch-to-buffer-other-window
   (reftex-get-file-buffer-force reftex-last-toc-file))
  (setq current-prefix-arg '(16))
  (reftex-toc))
(defun reftex-toc-revert (&rest ignore)
  "Regenerate the *toc* from the internal lists."
  (interactive)
  (switch-to-buffer-other-window
   (reftex-get-file-buffer-force reftex-last-toc-file))
  (reftex-erase-buffer "*toc*")
  (setq current-prefix-arg nil)
  (reftex-toc))
(defun reftex-toc-external (&rest ignore)
  "Switch to table of contents of an external document."
  (interactive)
  (let* ((old-buf (current-buffer))
         (xr-alist (get-text-property 1 'xr-alist))
         (xr-index (reftex-select-external-document
                   xr-alist 0)))
    (switch-to-buffer-other-window (or (reftex-get-file-buffer-force
                                        (cdr (nth xr-index xr-alist)))
                                       (error "Cannot switch document")))
    (reftex-toc)
    (if (equal old-buf (current-buffer))
        (message "")
      (message "Switched document"))))

(defun reftex-toc-visit-line (&optional final no-revisit)
  ;; Visit the tex file corresponding to the toc entry on the current line.
  ;; If FINAL is t, stay there
  ;; If FINAL is 'hide, hide the *toc* window.
  ;; Otherwise, move cursor back into *toc* window.
  ;; This function is pretty clever about finding back a section heading,
  ;; even if the buffer is not live, or things like outline, x-symbol etc.
  ;; have been active.

  (let* ((toc (get-text-property (point) 'toc))
         (file (nth 3 toc))
         (marker (nth 4 toc))
         (level (nth 5 toc))
         (literal (nth 7 toc))
         (emergency-point (nth 8 toc))
         (toc-window (selected-window))
         show-window show-buffer match)

    (unless toc (error "Don't know which toc line to visit"))

    (setq match
          (cond
           ((and (markerp marker) (marker-buffer marker))
            ;; Buffer is still live and we have the marker.  Should be easy.
            (switch-to-buffer-other-window (marker-buffer marker))
            (goto-char (marker-position marker))
            (or (looking-at (regexp-quote literal))
                (looking-at (reftex-make-regexp-allow-for-ctrl-m literal))
                (looking-at (reftex-make-desperate-section-regexp literal))
                (looking-at (concat "\\\\"
                                    (regexp-quote
                                     (car (rassq level 
                                                 reftex-section-levels-all)))
                                    "[[{]"))))
           ((or (not no-revisit)
                (reftex-get-buffer-visiting file))
            ;; Marker is lost.  Use the backup method.
            (switch-to-buffer-other-window
             (reftex-get-file-buffer-force file nil))
            (goto-char (or emergency-point (point-min)))
            (or (looking-at (regexp-quote literal))
                (let ((pos (point)))
                  (re-search-backward "\\`\\|[\r\n][ \t]*[\r\n]" nil t)
                  (or (reftex-nearest-match (regexp-quote literal) pos)
                      (reftex-nearest-match
                       (reftex-make-regexp-allow-for-ctrl-m literal) pos)
                      (reftex-nearest-match
                       (reftex-make-desperate-section-regexp literal) pos)))))
           (t (message reftex-no-follow-message) nil)
           ))

    (setq show-window (selected-window)
          show-buffer (current-buffer))

    (unless match
      (select-window toc-window)
      (error "Cannot find line"))

    (goto-char (match-beginning 0))
    (recenter 1)
    (reftex-highlight 0 (match-beginning 0) (match-end 0) (current-buffer))

    (select-window toc-window)

    ;; use the `final' parameter to decide what to do next
    (cond
     ((eq final t)
      (reftex-unhighlight 0)
      (select-window show-window))
     ((eq final 'hide)
      (reftex-unhighlight 0)
      (or (one-window-p) (delete-window))
      (switch-to-buffer show-buffer)
      (reftex-re-enlarge))
     (t nil))))

(defun reftex-make-desperate-section-regexp (old)
  ;; Return a regexp which will still match a section statement even if
  ;; x-symbol or isotex or the like have been at work in the mean time.
  (let* ((n (1+ (string-match "[[{]" old)))
         (new (regexp-quote (substring old 0 (1+ (string-match "[[{]" old)))))
         (old (substring old n)))
    (while (string-match
            "\\([\r\n]\\)\\|\\(\\`\\|[ \t\n\r]\\)\\([a-zA-Z0-9]+\\)\\([ \t\n\r]\\|}\\'\\)"
            old)
      (if (match-beginning 1)
          (setq new (concat new "[^\n\r]*[\n\r]"))
        (setq new (concat new "[^\n\r]*" (match-string 3 old))))
      (setq old (substring old (match-end 0))))
    new))

;;; =========================================================================
;;;
;;; BibTeX citations.

;; Variables and constants

;; The history list of regular expressions used for citations
(defvar reftex-cite-regexp-hist nil)

;; Prompt and help string for citation selection
(defconst reftex-citation-prompt
  "Select: [n]ext [p]revious [r]estrict [ ]full_entry [q]uit RET [?]Help+more")

(defconst reftex-citation-help
  " n / p      Go to next/previous entry (Cursor motion works as well).
 C-s / C-r  Search forward/backward.  Use repeated C-s/C-r as in isearch.
 g   / r    Start over with new regexp / Refine with additional regexp.
 SPC        Show full database entry in other window.
 f          Toggle follow mode: Other window will follow with full db entry.
 .          Show insertion point.
 q          Quit without inserting \\cite macro into buffer.
 TAB        Enter citation key with completion.
 RET        Accept current entry (also on mouse-2)
 a / A      Put all entries into single \cite / into many cite commands.")

(defvar reftex-select-bib-map nil
  "Keymap used for *RefTeX Select* buffer, when selecting a BibTeX entry.
This keymap can be used to configure the BibTeX selection process which is
started with the command \\[reftex-citation].")

(defun reftex-select-bib-mode ()
  "Major mode for selecting a citation key in a LaTeX document.
This buffer was created with RefTeX.
It only has a meaningful keymap when you are in the middle of a 
selection process.
In order to select a citation, move the cursor to it and press RET.
Press `?' for a summary of important key bindings.

During a selection process, these are the local bindings.

\\{reftex-select-label-map}"
  (interactive)
  (kill-all-local-variables)
  (make-local-hook 'pre-command-hook)
  (make-local-hook 'post-command-hook)
  (setq major-mode 'reftex-select-bib-mode
        mode-name "RefTeX Select Bib")
  ;; We do not set a local map - reftex-select-item does this.
  (run-hooks 'reftex-select-bib-mode-hook))

;; Find bibtex files

(defun reftex-get-bibfile-list ()
  ;; Return list of bibfiles for current document.
  ;; When using the chapterbib or bibunits package you should either
  ;; use the same database files everywhere, or separate parts using
  ;; different databases into different files (included into the mater file).
  ;; Then this function will return the applicable database files.

  ;; Ensure access to scanning info
  (reftex-access-scan-info)
  (or
   ;; Try inside this file (and its includes)
   (cdr (reftex-last-assoc-before-elt
         'bib (list 'eof (buffer-file-name))
         (member (list 'bof (buffer-file-name))
                 (symbol-value reftex-docstruct-symbol))))
   ;; Try after the beginning of this file
   (cdr (assq 'bib (member (list 'bof (buffer-file-name))
                           (symbol-value reftex-docstruct-symbol))))
   ;; Anywhere in the entire document
   (cdr (assq 'bib (symbol-value reftex-docstruct-symbol)))
   (error "\\bibliography statement missing or .bib files not found.")))

;; Find a certain reference in any of the BibTeX files.

(defun reftex-pop-to-bibtex-entry (key file-list &optional mark-to-kill
                                       highlight item return)
  ;; Find BibTeX KEY in any file in FILE-LIST in another window.
  ;; If MARK-TO-KILL is non-nil, mark new buffer to kill.
  ;; If HIGHLIGHT is non-nil, highlight the match.
  ;; If ITEM in non-nil, search for bibitem instead of database entry.
  ;; If RETURN is non-nil, just return the entry.

  (let* ((re
          (if item 
              (concat "\\\\bibitem\\(\\[[^]]*\\]\\)?{" (regexp-quote key) "}")
            (concat "@[a-zA-Z]+[ \t\n\r]*[{(][ \t\n\r]*" (regexp-quote key)
                    "[, \t\r\n}]")))
         (window-conf (current-window-configuration))
         file buf)

    (catch 'exit
      (switch-to-buffer-other-window (current-buffer))
      (while file-list
        (setq file (car file-list)
              file-list (cdr file-list))
        (unless (setq buf (reftex-get-file-buffer-force file mark-to-kill))
          (error "No such file %s" file))
        (switch-to-buffer buf)
        (widen)
        (goto-char (point-min))
        (when (re-search-forward re nil t)
          (goto-char (match-beginning 0))
          (when return
            ;; Just return the relevant entry
            (if item (goto-char (match-end 0)))
            (setq return (buffer-substring 
                          (point) (reftex-end-of-bib-entry item)))
            (set-window-configuration window-conf)
            (throw 'exit return))
          (recenter 0)
          (if highlight
              (reftex-highlight 0 (match-beginning 0) (match-end 0)))
          (throw 'exit (selected-window))))
      (set-window-configuration window-conf)
      (if item
          (error "No \\bibitem with citation key %s" key)
        (error "No BibTeX entry with citation key %s" key)))))

(defun reftex-end-of-bib-entry (item)
  (save-excursion 
    (condition-case nil
        (if item 
            (progn (end-of-line)
                   (re-search-forward
                    "\\\\bibitem\\|\\end{thebibliography}")
                   (1- (match-beginning 0)))
          (progn (forward-list 1) (point)))
      (error (min (point-max) (+ 300 (point)))))))

;; Parse bibtex buffers

(defun reftex-extract-bib-entries (buffers)
  ;; Extract bib entries which match regexps from BUFFERS.
  ;; BUFFERS is a list of buffers or file names.
  ;; Return list with entries."
  (let* (re-list first-re rest-re
                 (buffer-list (if (listp buffers) buffers (list buffers)))
                 found-list entry buffer1 buffer alist
                 key-point start-point end-point)

    ;; Read a regexp, completing on known citation keys.
    (setq re-list 
          (split-string 
           (completing-read 
            "RegExp [ && RegExp...]: "
            (if (fboundp 'LaTeX-bibitem-list)
                (LaTeX-bibitem-list)
              (cdr (assoc 'bibview-cache 
                          (symbol-value reftex-docstruct-symbol))))
            nil nil nil 'reftex-cite-regexp-hist)
           "[ \t]*&&[ \t]*"))

    (setq first-re (car re-list)    ; We'll use the first re to find things,
          rest-re  (cdr re-list))   ; the others to narrow down.
    (if (string-match "\\`[ \t]*\\'" first-re)
        (error "Empty regular expression"))

    (save-excursion
      (save-window-excursion

        ;; Walk through all bibtex files
        (while buffer-list
          (setq buffer (car buffer-list)
                buffer-list (cdr buffer-list))
          (if (and (bufferp buffer)
                   (buffer-live-p buffer))
              (setq buffer1 buffer)
            (setq buffer1 (reftex-get-file-buffer-force
                           buffer (not reftex-keep-temporary-buffers))))
          (if (not buffer1)
              (error "Cannot find BibTeX file %s" buffer)
            (message "Scanning bibliography database %s" buffer1))

          (set-buffer buffer1)
          (save-excursion
            (goto-char (point-min))
            (while (re-search-forward first-re nil t)
              (catch 'search-again
                (setq key-point (point))
                (unless (re-search-backward
                         "\\(\\`\\|[\n\r]\\)[ \t]*@\\([a-zA-Z]+\\)[ \t\n\r]*[{(]" nil t)
                  (throw 'search-again nil))
                (setq start-point (point))
                (goto-char (match-end 0))
                (condition-case nil
                    (up-list 1)
                  (error (goto-char key-point)
                          (throw 'search-again nil)))
                (setq end-point (point))

                ;; Ignore @string, @comment and @c entries or things
                ;; outside entries
                (when (or (string= (downcase (match-string 2)) "string")
                          (string= (downcase (match-string 2)) "comment")
                          (string= (downcase (match-string 2)) "c")
                          (< (point) key-point)) ; this means match not in {}
                  (goto-char key-point)
                  (throw 'search-again nil))

                ;; Well, we have got a match
                (setq entry (concat
                             (buffer-substring start-point (point)) "\n"))

                ;; Check if other regexp match as well
                (setq re-list rest-re)
                (while re-list
                  (unless (string-match (car re-list) entry)
                    ;; nope - move on
                    (throw 'search-again nil))
                  (pop re-list))

                (setq alist (reftex-parse-bibtex-entry
                             nil start-point end-point))
                (push (cons "&entry" entry) alist)

                ;; check for crossref entries
                (if (assoc "crossref" alist)
                    (setq alist
                          (append
                           alist (reftex-get-crossref-alist alist))))

                ;; format the entry
                (push (cons "&formatted" (reftex-format-bib-entry alist))
                      alist)

                ;; make key the first element
                (push (reftex-get-bib-field "&key" alist) alist)

                ;; add it to the list
                (push alist found-list))))
          (reftex-kill-temporary-buffers))))
    (setq found-list (nreverse found-list))

    ;; Sorting
    (cond
     ((eq 'author reftex-sort-bibtex-matches)
      (sort found-list 'reftex-bib-sort-author))
     ((eq 'year   reftex-sort-bibtex-matches)
      (sort found-list 'reftex-bib-sort-year))
     ((eq 'reverse-year reftex-sort-bibtex-matches)
      (sort found-list 'reftex-bib-sort-year-reverse))
     (t found-list))))

(defun reftex-bib-sort-author (e1 e2)
  (let ((al1 (reftex-get-bib-names "author" e1))
        (al2 (reftex-get-bib-names "author" e2)))
    (while (and al1 al2 (string= (car al1) (car al2)))
      (pop al1)
      (pop al2))
    (if (and (stringp (car al1))
             (stringp (car al2)))
        (string< (car al1) (car al2))
      (not (stringp (car al1))))))

(defun reftex-bib-sort-year (e1 e2)
  (< (string-to-int (cdr (assoc "year" e1)))
     (string-to-int (cdr (assoc "year" e2)))))

(defun reftex-bib-sort-year-reverse (e1 e2)
  (> (string-to-int (or (cdr (assoc "year" e1)) "0"))
     (string-to-int (or (cdr (assoc "year" e2)) "0"))))

(defun reftex-get-crossref-alist (entry)
  ;; return the alist from a crossref entry
  (let ((crkey (cdr (assoc "crossref" entry)))
        start)
    (save-excursion
      (save-restriction
        (widen)
        (if (re-search-forward
             (concat "@\\w+[{(][ \t\n\r]*" (regexp-quote crkey)
                     "[ \t\n\r]*,") nil t)
            (progn
              (setq start (match-beginning 0))
              (condition-case nil
                  (up-list 1)
                (error nil))
              (reftex-parse-bibtex-entry nil start (point)))
          nil)))))

;; Parse the thebibliography environment
(defun reftex-extract-bib-entries-from-thebibliography (file)
  ;; Extract bib-entries from the \begin{thebibliography} environment.
  ;; Parsing is not as good as for the BibTeX database stuff.
  ;; The environment should be located in file FILE.

  (let* (start end buf entries re re-list)
    (unless file
      (error "Need file name to find thebibliography environment"))
    (setq buf (reftex-get-file-buffer-force 
               file (not reftex-keep-temporary-buffers)))
    (unless buf
      (error "No such file %s" file))
    (message "Scanning thebibliography environment in %s" file)

    (save-excursion
      (set-buffer buf)
      (save-restriction
        (widen)
        (goto-char (point-min))
        (if (re-search-forward 
             "\\(\\`\\|[\n\r]\\)[ \t]*\\\\begin{thebibliography}" nil t)
            (progn
              (beginning-of-line 2)
              (setq start (point))))
        (if (re-search-forward 
             "\\(\\`\\|[\n\r]\\)[ \t]*\\\\end{thebibliography}" nil t)
            (progn
              (beginning-of-line 1)
              (setq end (point))))
        (when (and start end)
          (setq entries 
                (mapcar 'reftex-parse-bibitem
                   (delete ""
                      (split-string 
                       (buffer-substring-no-properties start end)
                       "[ \t\n\r]*\\\\bibitem\\(\\[[^]]*]\\)*")))))))
    (unless entries
      (error "No bibitems found"))

    (setq re-list (split-string 
                   (read-string "RegExp [ && RegExp...]: "
                                nil 'reftex-cite-regexp-hist)
                   "[ \t]*&&[ \t]*"))
    (if (string-match "\\`[ \t]*\\'" (car re-list))
        (error "Empty regular expression"))

    (while (and (setq re (pop re-list)) entries)
      (setq entries 
            (delq nil (mapcar
                       (function
                        (lambda (x)
                          (if (string-match re (cdr (assoc "&entry" x)))
                              x nil)))
                       entries))))
    (setq entries 
          (mapcar 
            (lambda (x)
              (push (cons "&formatted" (reftex-format-bibitem x)) x)
              (push (reftex-get-bib-field "&key" x) x)
              x)
           entries))

    entries))

;; Parse and format individual entries

(defun reftex-get-bib-names (field entry)
  ;; Return a list with the author or editor names in ENTRY
  (let ((names (reftex-get-bib-field field entry)))
    (if (equal "" names)
        (setq names (reftex-get-bib-field "editor" entry)))
    (while (string-match "\\band\\b[ \t]*" names)
      (setq names (replace-match "\n" nil t names)))
    (while (string-match "[\\.a-zA-Z\\-]+\\.[ \t]*\\|,.*\\|[{}]+" names)
      (setq names (replace-match "" nil t names)))
    (while (string-match "^[ \t]+\\|[ \t]+$" names)
      (setq names (replace-match "" nil t names)))
    (while (string-match "[ \t][ \t]+" names)
      (setq names (replace-match " " nil t names)))
    (split-string names "\n")))

(defun reftex-parse-bibtex-entry (entry &optional from to)
  (let (alist key start field)
    (save-excursion
      (save-restriction
        (if entry
            (progn
              (set-buffer (get-buffer-create " *RefTeX-scratch*"))
              (fundamental-mode)
              (erase-buffer)
              (insert entry))
          (widen)
          (narrow-to-region from to))
        (goto-char (point-min))

        (if (re-search-forward
             "@\\(\\w+\\)[ \t\n\r]*[{(][ \t\n\r]*\\([^ \t\n\r,]+\\)" nil t)
            (setq alist
                  (list
                   (cons "&type" (downcase (reftex-match-string 1)))
                   (cons "&key"  (reftex-match-string 2)))))
        (while (re-search-forward "\\(\\w+\\)[ \t\n\r]*=[ \t\n\r]*" nil t)
          (setq key (downcase (reftex-match-string 1)))
          (cond
           ((= (following-char) ?{)
            (forward-char 1)
            (setq start (point))
            (condition-case nil
                (up-list 1)
              (error nil)))
           ((= (following-char) ?\")
            (forward-char 1)
            (setq start (point))
            (while (and (search-forward "\"" nil t)
                        (= ?\\ (char-after (- (point) 2))))))
           (t
            (setq start (point))
            (re-search-forward "[ \t]*[\n\r,}]" nil 1)))
          (setq field (buffer-substring-no-properties start (1- (point))))
          ;; remove extra whitespace
          (while (string-match "[\n\t\r]\\|[ \t][ \t]+" field)
            (setq field (replace-match " " nil t field)))
          ;; remove leading garbage
          (if (string-match "^[ \t{]+" field)
              (setq field (replace-match "" nil t field)))
          ;; remove trailing garbage
          (if (string-match "[ \t}]+$" field)
              (setq field (replace-match "" nil t field)))
          (push (cons key field) alist))))
    alist))

(defun reftex-get-bib-field (fieldname entry &optional format)
  ;; Extract the field FIELDNAME from an ENTRY
  (let ((cell (assoc fieldname entry)))
    (if cell
        (if format
            (format format (cdr cell))
          (cdr cell))
      "")))

(defun reftex-format-bib-entry (entry)
  ;; Format a BibTeX ENTRY so that it is nice to look at
  (let*
      ((auth-list (reftex-get-bib-names "author" entry))
       (authors (mapconcat 'identity auth-list ", "))
       (year      (reftex-get-bib-field "year" entry))
       (title     (reftex-get-bib-field "title" entry))
       (type      (reftex-get-bib-field "&type" entry))
       (key       (reftex-get-bib-field "&key"  entry))
       (extra
        (cond
         ((equal type "article")
          (concat (reftex-get-bib-field "journal" entry) " "
                  (reftex-get-bib-field "volume" entry) ", "
                  (reftex-get-bib-field "pages" entry)))
         ((equal type "book")
          (concat "book (" (reftex-get-bib-field "publisher" entry) ")"))
         ((equal type "phdthesis")
          (concat "PhD: " (reftex-get-bib-field "school" entry)))
         ((equal type "mastersthesis")
          (concat "Master: " (reftex-get-bib-field "school" entry)))
         ((equal type "inbook")
          (concat "Chap: " (reftex-get-bib-field "chapter" entry)
                  ", pp. " (reftex-get-bib-field "pages"   entry)))
         ((or (equal type "conference")
              (equal type "incollection")
              (equal type "inproceedings"))
          (reftex-get-bib-field "booktitle" entry "in: %s"))
         (t ""))))
    (setq authors (reftex-truncate authors 30 t t))
    (when (reftex-use-fonts)
      (put-text-property 0 (length key)     'face
                         (reftex-verified-face reftex-label-face
                                               'font-lock-constant-face
                                               'font-lock-reference-face)
                         key)
      (put-text-property 0 (length authors) 'face reftex-bib-author-face
                         authors)
      (put-text-property 0 (length year)    'face reftex-bib-year-face
                         year)
      (put-text-property 0 (length title)   'face reftex-bib-title-face
                         title)
      (put-text-property 0 (length extra)   'face reftex-bib-extra-face
                         extra))
    (concat key "\n     " authors " " year " " extra "\n     " title "\n\n")))

(defun reftex-parse-bibitem (item)
  ;; Parse a \bibitem entry
  (let ((key "") (text ""))
    (when (string-match "\\`{\\([^}]+\\)}\\([\001-\255]*\\)" item)
      (setq key (match-string 1 item)
            text (match-string 2 item)))
    ;; Clean up the text a little bit
    (while (string-match "[\n\r\t]\\|[ \t][ \t]+" text)
      (setq text (replace-match " " nil t text)))
    (if (string-match "\\`[ \t]+" text)
        (setq text (replace-match "" nil t text)))
    (list
     (cons "&key" key)
     (cons "&text" text)
     (cons "&entry" (concat key " " text)))))

(defun reftex-format-bibitem (item)
  ;; Format a \bibitem entry so that it is (relatively) nice to look at.
  (let ((text (reftex-get-bib-field "&text" item))
        (key  (reftex-get-bib-field "&key" item))
        (lines nil))

    ;; Wrap the text into several lines.
    (while (and (> (length text) 70)
                (string-match " " (substring text 60)))
        (push (substring text 0 (+ 60 (match-beginning 0))) lines)
        (setq text (substring text (+ 61 (match-beginning 0)))))
    (push text lines)
    (setq text (mapconcat 'identity (nreverse lines) "\n     "))

    (when (reftex-use-fonts)
      (put-text-property 0 (length text) 'face reftex-bib-author-face text))
    (concat key "\n     " text "\n\n")))

;; Make a citation

;;;###autoload
(defun reftex-citation (&optional no-insert)
  "Make a citation using BibTeX database files.
After asking for a Regular Expression, it scans the buffers with
bibtex entries (taken from the \\bibliography command) and offers the
matching entries for selection.  The selected entry is formated according
to `reftex-cite-format' and inserted into the buffer.
If NO-INSERT is non-nil, nothing is inserted, only the selected key returned.
The regular expression uses an expanded syntax: && is interpreted as `and'.
Thus, `aaaa&&bbb' matches entries which contain both `aaaa' and `bbb'.
While entering the regexp, completion on knows citation keys is possible.
When this function is called with point inside the braces of a \\cite
command, it will add another key, ignoring the value of `reftex-cite-format'.
When called with a numeric prefix, that many citations will be made and all
put into the same \\cite command.
When called with just or two C-u as prefix, enforces rescan of buffer for
bibliography statement (e.g. if it was changed)."

  (interactive)

  ;; check for recursive edit
  (reftex-check-recursive-edit)

  ;; This function may also be called outside reftex-mode.
  ;; Thus look for the scanning info only if in reftex-mode.

  (when reftex-mode
    (reftex-access-scan-info current-prefix-arg))

  ;; Call reftex-do-citation, but protected
  (unwind-protect
      (reftex-do-citation current-prefix-arg no-insert)
    (reftex-kill-temporary-buffers)))

(defun reftex-do-citation (&optional arg no-insert)
  ;; This really does the work of reftex-citation.

  (let* ((format (reftex-figure-out-cite-format arg no-insert))
         (docstruct-symbol reftex-docstruct-symbol)
         (selected-entries (reftex-offer-bib-menu))
         (insert-entries selected-entries)
         entry string cite-view)

    (unless selected-entries (error "Quit"))

    (if (stringp selected-entries)
        ;; Nonexistent entry
        (setq selected-entries nil
              insert-entries (list (list selected-entries
                                         (cons "&key" selected-entries))))
      ;; It makes sense to compute the cite-view strings.
      (setq cite-view t))

    (when (eq (car selected-entries) 'concat)
      ;; All keys go into a single command - we need to trick a little
      (pop selected-entries)
      (let ((concat-keys (mapconcat 'car selected-entries ",")))
        (setq insert-entries 
              (list (list concat-keys (cons "&key" concat-keys))))))
    
    (unless no-insert

      ;; We shall insert this into the buffer...
      (message "Formatting...")

      (while (setq entry (pop insert-entries))
        ;; Format the citation and insert it
        (setq string (if reftex-format-cite-function
                         (funcall reftex-format-cite-function
                                  (reftex-get-bib-field "&key" entry)
                                  format)
                       (reftex-format-citation entry format)))
        (insert string))

      ;; Reposition cursor?
      (when (string-match "\\?" string)
        (search-backward "?")
        (delete-char 1))

      ;; Tell AUCTeX
      (when (and reftex-mode 
                 (fboundp 'LaTeX-add-bibitems)
                 reftex-plug-into-AUCTeX)
        (apply 'LaTeX-add-bibitems (mapcar 'car selected-entries)))
      
      ;; Produce the cite-view strings
      (when (and reftex-mode reftex-cache-cite-echo cite-view)
        (mapcar (lambda (entry) 
                  (reftex-make-cite-echo-string entry docstruct-symbol))
                selected-entries))

      (message ""))

    (set-marker reftex-select-return-marker nil)
    (reftex-kill-buffer "*RefTeX Select*")
    
    ;; Check if the prefix arg was numeric, and call recursively
    (when (integerp arg)
      (if (> arg 1)
          (progn      
            (skip-chars-backward "}")
            (decf arg)
            (reftex-do-citation arg))
        (forward-char 1)))
    
    ;; Return the citation key
    (car (car selected-entries))))

(defun reftex-figure-out-cite-format (arg no-insert)
  ;; Check if there is already a cite command at point and change cite format
  ;; in order to only add another reference in the same cite command.
  (let ((macro (car (reftex-what-macro 1)))
        (cite-format-value (reftex-get-cite-format))
        key format)
    (cond
     (no-insert
      ;; Format does not really matter because nothing will be inserted.
      (setq format "%l"))
     
     ((and (stringp macro)
           (string-match "\\`\\\\cite\\|cite\\'" macro))
      ;; We are already inside a cite macro
      (if (or (not arg) (not (listp arg)))
          (setq format
                (concat
                 (if (member (preceding-char) '(?\{ ?,)) "" ",")
                 "%l"
                 (if (member (following-char) '(?\} ?,)) "" ",")))
        (setq format "%l")))
     (t
      ;; Figure out the correct format
      (setq format
            (if (and (symbolp cite-format-value)
                     (assq cite-format-value reftex-cite-format-builtin))
                (nth 2 (assq cite-format-value reftex-cite-format-builtin))
              cite-format-value))
      (when (listp format)
        (setq key
              (reftex-select-with-char 
               "" (concat "SELECT A CITATION FORMAT\n\n"
                          (mapconcat
                           (lambda (x)
                             (format "[%c] %s  %s" (car x)
                                     (if (> (car x) 31) " " "")
                                     (cdr x)))
                           format "\n"))))
        (if (assq key format)
            (setq format (cdr (assq key format)))
          (error "No citation format associated with key `%c'" key)))))
    format))

(defun reftex-get-cite-format ()
  ;; Return the current citation format.  Either the document-local value in
  ;; reftex-cite-format-symbol, or the global value in reftex-cite-format.
  (if (and reftex-docstruct-symbol
           (symbolp reftex-docstruct-symbol)
           (get reftex-docstruct-symbol 'reftex-cite-format))
      (get reftex-docstruct-symbol 'reftex-cite-format)
    reftex-cite-format))

(defun reftex-offer-bib-menu ()
  ;; Offer bib menu and return list of selected items

  (let (found-list rtn key data selected-entries)

    (while 
        (not 
         (catch 'done
           ;; Scan bibtex files
           (setq found-list
              (cond
               ((assq 'bib (symbol-value reftex-docstruct-symbol))
                ;; using BibTeX database files.
                (reftex-extract-bib-entries (reftex-get-bibfile-list)))
               ((assq 'thebib (symbol-value reftex-docstruct-symbol))
                ;; using thebibliography environment.
                (reftex-extract-bib-entries-from-thebibliography
                 (cdr (assq 'thebib (symbol-value reftex-docstruct-symbol)))))
               (reftex-default-bibliography
                (message "Using default bibliography")
                (reftex-extract-bib-entries reftex-default-bibliography))
               (t (error "No valid bibliography in this document, and no default available"))))
           
           (unless found-list
             (error "Sorry, no matches found"))
    
          ;; Remember where we came from
          (setq reftex-call-back-to-this-buffer (current-buffer))
          (set-marker reftex-select-return-marker (point))
    
          ;; Offer selection
          (save-window-excursion
            (delete-other-windows)
            (let ((default-major-mode 'reftex-select-bib-mode))
              (reftex-kill-buffer "*RefTeX Select*")
              (switch-to-buffer-other-window "*RefTeX Select*")
              (unless (eq major-mode 'reftex-select-bib-mode)
                (reftex-select-bib-mode))
              (let ((buffer-read-only nil))
                (erase-buffer)
                (reftex-insert-bib-matches found-list)))
            (setq buffer-read-only t)
            (if (= 0 (buffer-size))
                (error "Sorry, no matches found"))
            (setq truncate-lines t)
            (goto-char 1)
            (while t
              (setq rtn
                    (reftex-select-item
                     reftex-citation-prompt
                     reftex-citation-help
                     reftex-select-bib-map
                     nil
                     'reftex-bibtex-selection-callback nil))
              (setq key (car rtn)
                    data (nth 1 rtn))
              (unless key (throw 'done t))
              (cond
               ((eq key ?g)
                ;; Start over
                (throw 'done nil))
               ((eq key ?r)
                ;; Restrict with new regular expression
                (setq found-list (reftex-restrict-bib-matches found-list))
                (let ((buffer-read-only nil))
                  (erase-buffer)
                  (reftex-insert-bib-matches found-list))
                (goto-char 1))
               ((eq key ?A)
                ;; Take all
                (setq selected-entries found-list)
                (throw 'done t))
               ((eq key ?a)
                ;; Take all
                (setq selected-entries (cons 'concat found-list))
                (throw 'done t))
               ((or (eq key ?\C-m)
                    (eq key 'return))
                ;; Take selected
                (setq selected-entries (if data (list data) nil))
                (throw 'done t))
               ((stringp key)
                ;; Got this one with completion
                (setq selected-entries key)
                (throw 'done t))
               (t
                (ding))))))))
    selected-entries))

(defun reftex-restrict-bib-matches (found-list)
  ;; Limit FOUND-LIST with more regular expressions
  (let ((re-list (split-string (read-string
                                "RegExp [ && RegExp...]: "
                                nil 'reftex-cite-regexp-hist)
                               "[ \t]*&&[ \t]*"))
        (found-list-r found-list)
        re)
    (while (setq re (pop re-list))
      (setq found-list-r
            (delq nil
                  (mapcar
                   (lambda (x)
                     (if (string-match
                          re (cdr (assoc "&entry" x)))
                         x
                       nil))
                   found-list-r))))
    (if found-list-r
        found-list-r
      (ding)
      found-list)))

(defun reftex-insert-bib-matches (list)
  ;; Insert the bib matches and number them correctly
  (let ((mouse-face
         (if (memq reftex-highlight-selection '(mouse both))
             reftex-mouse-selected-face
           nil))
        tmp len)
    (mapcar 
     (function
      (lambda (x)
        (setq tmp (cdr (assoc "&formatted" x))
              len (length tmp))
        (put-text-property 0 len ':data x tmp)
        (put-text-property 0 (1- len) 'mouse-face mouse-face tmp)
        (insert tmp)))
     list))
  (run-hooks 'reftex-display-copied-context-hook))

(defun reftex-format-names (namelist n)
  (let (last (len (length namelist)))
    (cond
     ((< len 1) "")
     ((= 1 len) (car namelist))
     ((> len n) (concat (car namelist) (nth 2 reftex-cite-punctuation)))
     (t
      (setq n (min len n)
            last (nth (1- n) namelist))
      (setcdr (nthcdr (- n 2) namelist) nil)
      (concat
       (mapconcat 'identity namelist (nth 0 reftex-cite-punctuation))
       (nth 1 reftex-cite-punctuation)
       last)))))

(defun reftex-format-citation (entry format)
  ;; Format a citation from the info in the BibTeX ENTRY

  (unless (stringp format) (setq format "\\cite{%l}"))

  (if (and reftex-comment-citations
           (string-match "%l" reftex-cite-comment-format))
      (error "reftex-cite-comment-format contains illegal %%l"))

  (while (string-match
          "\\(\\`\\|[^%]\\)\\(\\(%\\([0-9]*\\)\\([a-zA-Z]\\)\\)[.,;: ]*\\)"
          format)
    (let ((n (string-to-int (match-string 4 format)))
          (l (string-to-char (match-string 5 format)))
          rpl b e)
      (save-match-data
        (setq rpl
              (cond
               ((= l ?l) (concat
                          (reftex-get-bib-field "&key" entry)
                          (if reftex-comment-citations
                              reftex-cite-comment-format
                            "")))
               ((= l ?a) (reftex-format-names
                          (reftex-get-bib-names "author" entry)
                          (or n 2)))
               ((= l ?A) (car (reftex-get-bib-names "author" entry)))
               ((= l ?b) (reftex-get-bib-field "booktitle" entry "in: %s"))
               ((= l ?B) (reftex-abbreviate-title
                          (reftex-get-bib-field "booktitle" entry "in: %s")))
               ((= l ?c) (reftex-get-bib-field "chapter" entry))
               ((= l ?d) (reftex-get-bib-field "edition" entry))
               ((= l ?e) (reftex-format-names
                          (reftex-get-bib-names "editor" entry)
                          (or n 2)))
               ((= l ?E) (car (reftex-get-bib-names "editor" entry)))
               ((= l ?h) (reftex-get-bib-field "howpublished" entry))
               ((= l ?i) (reftex-get-bib-field "institution" entry))
               ((= l ?j) (reftex-get-bib-field "journal" entry))
               ((= l ?k) (reftex-get-bib-field "key" entry))
               ((= l ?m) (reftex-get-bib-field "month" entry))
               ((= l ?n) (reftex-get-bib-field "number" entry))
               ((= l ?o) (reftex-get-bib-field "organization" entry))
               ((= l ?p) (reftex-get-bib-field "pages" entry))
               ((= l ?P) (car (split-string
                               (reftex-get-bib-field "pages" entry)
                               "[- .]+")))
               ((= l ?s) (reftex-get-bib-field "school" entry))
               ((= l ?u) (reftex-get-bib-field "publisher" entry))
               ((= l ?r) (reftex-get-bib-field "address" entry))
               ((= l ?t) (reftex-get-bib-field "title" entry))
               ((= l ?T) (reftex-abbreviate-title
                          (reftex-get-bib-field "title" entry)))
               ((= l ?v) (reftex-get-bib-field "volume" entry))
               ((= l ?y) (reftex-get-bib-field "year" entry)))))

      (if (string= rpl "")
          (setq b (match-beginning 2) e (match-end 2))
        (setq b (match-beginning 3) e (match-end 3)))
      (setq format (concat (substring format 0 b) rpl (substring format e)))))
  (while (string-match "%%" format)
    (setq format (replace-match "%" t t format)))
  (while (string-match "[ ,.;:]*%<" format)
    (setq format (replace-match "" t t format)))
  format)

(defun reftex-bibtex-selection-callback (data ignore no-revisit)
  ;; Callback function to be called from the BibTeX selection, in
  ;; order to display context.  This function is relatively slow and not
  ;; recommended for follow mode.  It works OK for individual lookups.
  (let ((win (selected-window))
        (key (reftex-get-bib-field "&key" data))
        bibfile-list item tmp)

    (catch 'exit
      (save-excursion
        (set-buffer reftex-call-back-to-this-buffer)
        (cond
         ((assq 'bib (symbol-value reftex-docstruct-symbol))
          (setq bibfile-list (reftex-get-bibfile-list)))
         ((setq tmp (assq 'thebib (symbol-value reftex-docstruct-symbol)))
          (setq bibfile-list (list (cdr tmp))
                item t))
         (reftex-default-bibliography
          (setq bibfile-list reftex-default-bibliography))
         (t (ding) (throw 'exit))))

      (when no-revisit
        (setq bibfile-list (reftex-visited-files bibfile-list)))

      (condition-case nil
          (reftex-pop-to-bibtex-entry 
           key bibfile-list (not reftex-keep-temporary-buffers) t item)
        (error (ding))))
      
    (select-window win)))

;;; =========================================================================
;;;
;;; Here is the routine used for selection

;; Marker for return point from recursive edit
(defvar reftex-recursive-edit-marker (make-marker))

(defvar reftex-last-data nil)
(defvar reftex-last-line nil)

(defun reftex-check-recursive-edit ()
  ;; Check if we are already in a recursive edit.  Abort with helpful
  ;; message if so.
  (if (marker-position reftex-recursive-edit-marker)
      (error
       (substitute-command-keys
        "In unfinished selection process. Finish, or abort with \\[abort-recursive-edit]."))))

(defun reftex-select-item (prompt help-string keymap
                                  &optional offset
                                  call-back cb-flag)
;; Select an item, using PROMPT. The function returns a key indicating
;; an exit status, along with a data structure indicating which item was
;; selected.
;; HELP-STRING contains help.  KEYMAP is a keymap with the available
;; selection commands.
;; OFFSET can be a label list item which will be selected at start.
;; When it is t, point will start out at the beginning of the buffer.
;; Any other value will cause restart where last selection left off.
;; When CALL-BACK is given, it is a function which is called with the index
;; of the element.
;; CB-FLAG is the initial value of that flag.

  (let* (ev data last-data callback-fwd (selection-buffer (current-buffer)))

    (setq ev
          (catch 'myexit
            (save-window-excursion
              (setq truncate-lines t)

              ;; Find a good starting point
              (cond
               (offset
                (goto-char
                 (or (and (listp offset)
                          (text-property-any (point-min) (point-max)
                                             ':data offset))
                     (and (local-variable-p 'reftex-last-data (current-buffer))
                          (boundp 'reftex-last-data)
                          (listp reftex-last-data)
                          (text-property-any (point-min) (point-max)
                                             ':data reftex-last-data))
                     (and (local-variable-p 'reftex-last-line (current-buffer))
                          (boundp 'reftex-last-line)
                          (integerp reftex-last-line)
                          (progn (goto-line reftex-last-line) (point)))
                     (point-min))))
               (t (goto-char (point-min))))
              (beginning-of-line 1)
              (set (make-local-variable 'reftex-last-follow-point) (point))

      (unwind-protect
          (progn
            (use-local-map keymap)
            (add-hook 'pre-command-hook 'reftex-select-pre-command-hook nil t)
            (add-hook 'post-command-hook 'reftex-select-post-command-hook nil t)
            (princ prompt)
            (set-marker reftex-recursive-edit-marker (point))
            ;; XEmacs does not run post-command-hook here
            (and (featurep 'xemacs) (run-hooks 'post-command-hook))
            (recursive-edit))

        (set-marker reftex-recursive-edit-marker nil)
        (save-excursion
          (set-buffer selection-buffer)
          (use-local-map nil)
          (remove-hook 'pre-command-hook 'reftex-select-pre-command-hook t)
          (remove-hook 'post-command-hook 
                       'reftex-select-post-command-hook t))))))

    (set (make-local-variable 'reftex-last-line)
         (+ (count-lines (point-min) (point)) (if (bolp) 1 0)))
    (set (make-local-variable 'reftex-last-data) last-data)
    (reftex-kill-buffer "*RefTeX Help*")
    (setq callback-fwd (not callback-fwd)) ;; ;-)))
    (message "")
    (list ev data last-data)))

;; The following variables are all bound dynamically in `reftex-select-item'.
;; The defvars are here only to silence the byte compiler.

(defvar found-list)
(defvar cb-flag)
(defvar data)
(defvar prompt)
(defvar last-data)
(defvar call-back)
(defvar help-string)
(defvar callback-fwd)
(defvar varioref)

;; The selection commands

(defun reftex-select-pre-command-hook ()
  (reftex-unhighlight 1)
  (reftex-unhighlight 0))

(defun reftex-select-post-command-hook ()
  (let (b e)
    (setq data (get-text-property (point) ':data))
    (setq last-data (or data last-data))
  
    (when (and data cb-flag
               (not (equal reftex-last-follow-point (point))))
      (setq reftex-last-follow-point (point))
      (funcall call-back data callback-fwd 
               (not reftex-revisit-to-follow)))
    (if data
        (setq b (or (previous-single-property-change
                     (1+ (point)) ':data)
                    (point-min))
              e (or (next-single-property-change
                     (point) ':data)
                    (point-max)))
      (setq b (point) e (point)))
    (and (memq reftex-highlight-selection '(cursor both))
         (reftex-highlight 1 b e))
    (if (or (not (pos-visible-in-window-p b))
            (not (pos-visible-in-window-p e)))
        (recenter '(4)))
    (unless (current-message)
      (princ prompt))))

(defun reftex-select-next (&optional arg)
  "Move to next selectable item."
  (interactive "p")
  (setq callback-fwd t)
  (or (eobp) (forward-char 1))
  (re-search-forward "^[^. \t\n\r]" nil t arg)
  (beginning-of-line 1))
(defun reftex-select-previous (&optional arg)
  "Move to previous selectable item."
  (interactive "p")
  (setq callback-fwd nil)
  (re-search-backward "^[^. \t\n\r]" nil t arg))
(defun reftex-select-next-heading (&optional arg)
  "Move to next table of contentes line."
  (interactive "p")
  (end-of-line)
  (re-search-forward "^ " nil t arg)
  (beginning-of-line))
(defun reftex-select-previous-heading (&optional arg)
  "Move to previous table of contentes line."
  (interactive "p")
  (re-search-backward "^ " nil t arg))
(defun reftex-select-quit ()
  "Abort selection process."
  (interactive)
  (throw 'myexit nil))
(defun reftex-select-keyboard-quit ()
  "Abort selection process."
  (interactive)
  (throw 'exit t))
(defun reftex-select-jump-to-previous ()
  "Jump back to where previous selection process left off."
  (interactive)
  (let (pos)
    (cond
     ((and (local-variable-p 'reftex-last-data (current-buffer))
           reftex-last-data
           (setq pos (text-property-any (point-min) (point-max)
                                        ':data reftex-last-data)))
      (goto-char pos))
     ((and (local-variable-p 'reftex-last-line (current-buffer))
           (integerp reftex-last-line))
      (goto-line reftex-last-line))
     (t (ding)))))
(defun reftex-select-toggle-follow ()
  "Toggle follow mode:  Other window follows with full context."
  (interactive)
  (setq reftex-last-follow-point -1)
  (setq cb-flag (not cb-flag)))
(defun reftex-select-toggle-varioref ()
  "Toggle the macro used for referencing the label between \\ref and \\vref."
  (interactive)
  (if (string= varioref "\\ref")
      (setq varioref "\\vref")
    (setq varioref "\\ref"))
  (force-mode-line-update))
(defun reftex-select-show-insertion-point ()
  "Show the point from where selection was started in another window."
  (interactive)
  (let ((this-window (selected-window)))
    (unwind-protect
        (progn
          (switch-to-buffer-other-window
           (marker-buffer reftex-select-return-marker))
          (goto-char (marker-position reftex-select-return-marker))
          (recenter '(4)))
      (select-window this-window))))
(defun reftex-select-callback ()
  "Show full context in another window."
  (interactive)
  (if data (funcall call-back data callback-fwd nil) (ding)))
(defun reftex-select-accept ()
  "Accept the currently selected item."
  (interactive)
  (throw 'myexit 'return))
(defun reftex-select-mouse-accept (ev)
  "Accept the item at the mouse click."
  (interactive "e")
  (mouse-set-point ev)
  (setq data (get-text-property (point) ':data))
  (setq last-data (or data last-data))
  (throw 'myexit 'return))
(defun reftex-select-read-label ()
  "Use minibuffer to read a label to reference, with completion."
  (interactive)
  (let ((label (completing-read 
                "Label: " (symbol-value reftex-docstruct-symbol)
                nil nil reftex-prefix)))
    (unless (or (equal label "") (equal label reftex-prefix))
      (throw 'myexit label))))
(defun reftex-select-read-cite ()
  "Use minibuffer to read a citation key with completion."
  (interactive)
  (let* ((key (completing-read "Citation key: " found-list))
         (entry (assoc key found-list)))
    (cond
     ((or (null key) (equal key "")))
     (entry
      (setq data entry)
      (setq last-data data)
      (throw 'myexit 'return))
     (t (throw 'myexit key)))))
(defun reftex-select-help ()
  "Display a summary of the special key bindings."
  (interactive)
  (with-output-to-temp-buffer "*RefTeX Help*"
    (princ help-string))
  (reftex-enlarge-to-fit "*RefTeX Help*" t))

;;; =========================================================================
;;;
;;; View cross references

(defun reftex-view-crossref (&optional arg how)
  "View cross reference of \\ref or \\cite macro at point.
If the macro at point is a \\ref, show the corresponding label definition.
If it is a \\cite, show the BibTeX database entry or the \\bibitem.
To cope with the plethora of variations in packages, this
function assumes any macro either starting with or ending in `ref' or
`cite' to contain cross references.
When the LaTeX package `xr' is being used, this command will also view
crossreferences in external documents.  However, this works correctly only
when the \\externaldocument macros are used with the optional label prefix
argument.
With one or two C-u prefixes, enforce rescanning of the document.
With argument 2, select the window showing the cross reference.
When HOW is 'echo, call the corresponding echo function.
When HOW is 'tmp-window, make the pop-up window as small as possible and
arrange for its removal before the next command."

  (interactive "P")

  ;; See where we are.
  (let* ((macro (car (reftex-what-macro 1)))
         (key (reftex-this-word "^{}%\n\r,")))

    (setq reftex-call-back-to-this-buffer (current-buffer))

    (if (and macro
             (string-match "\\`\\\\cite\\|\\`\\\\ref\\|cite\\'\\|ref\\'"
                           macro))
        (and (setq macro (match-string 0 macro))
             (string-match "\\`\\\\" macro)
             (setq macro (substring macro 1)))
      (setq macro nil))

    (if (or (null macro) (reftex-in-comment))
        (error "No cross reference to display"))

    (if (eq how 'tmp-window)
        ;; Remember the window configuration
        (put 'reftex-auto-view-crossref 'last-window-conf 
             (current-window-configuration)))
    (cond
     ((string= macro "cite")
      (reftex-view-cr-cite arg key how))
     ((string= macro "ref")
      (reftex-view-cr-ref arg key how))
     (t 
      (error "Cannot display crossref\n")))))
     
(defun reftex-view-cr-cite (arg key how)
  ;; View crossreference of a ref cite.  HOW can have the values 
  ;; nil:         Show in another window.
  ;; echo:        Show one-line info in echo area.
  ;; tmp-window:  Show in small window and arrange for window to disappear.

  ;; Ensure access to scanning info
  (reftex-access-scan-info (or arg current-prefix-arg))

  (let (files size item (pos (point)) (win (selected-window)) pop-win)
    ;; Find the citation mode and the file list
    (cond
     ((assq 'bib (symbol-value reftex-docstruct-symbol))
      (setq item nil
            files (reftex-get-bibfile-list)))
     ((assq 'thebib (symbol-value reftex-docstruct-symbol))
      (setq item t
            files (list (cdr (assq 'thebib 
                                   (symbol-value reftex-docstruct-symbol))))))
     (reftex-default-bibliography
      (setq item nil
            files reftex-default-bibliography))
     (how)  ;; don't throw for special display
     (t (error "Cannot display crossref")))

    (if (eq how 'echo)
        ;; Display in Echo area
        (reftex-echo-cite key files item)
      ;; Display in a window
      (if (not (eq how 'tmp-window))
          ;; Normal display
          (reftex-pop-to-bibtex-entry key files nil t item)
        ;; A temporary window
        (condition-case nil
            (reftex-pop-to-bibtex-entry key files nil t item)
          (error (goto-char pos)
                 (message "cite: no such citation key %s" key)
                 (error "")))
        ;; Resize the window
        (setq size (max 1 (count-lines (point)
                                       (reftex-end-of-bib-entry item))))
        (let ((window-min-height 2))
          (shrink-window (1- (- (window-height) size)))
          (recenter 0))
        ;; Arrange restoration
        (add-hook 'pre-command-hook 'reftex-restore-window-conf))

        ;; Normal display in other window
      (add-hook 'pre-command-hook 'reftex-highlight-shall-die)
      (setq pop-win (selected-window))
      (select-window win)
      (goto-char pos)
      (when (equal arg 2)
        (select-window pop-win)))))

(defun reftex-view-cr-ref (arg label how)
  ;; View crossreference of a ref macro.  HOW can have the values 
  ;; nil:         Show in another window.
  ;; echo:        Show one-line info in echo area.
  ;; tmp-window:  Show in small window and arrange for window to disappear.

  ;; Ensure access to scanning info
  (reftex-access-scan-info (or arg current-prefix-arg))
  
  (let* ((xr-data (assoc 'xr (symbol-value reftex-docstruct-symbol)))
         (xr-re (nth 2 xr-data))
         (entry (assoc label (symbol-value reftex-docstruct-symbol)))
         (win (selected-window)) pop-win (pos (point)))
    
    (if (and (not entry) (stringp label) xr-re (string-match xr-re label))
        ;; Label is defined in external document
        (save-excursion
          (save-match-data
            (set-buffer 
             (or (reftex-get-file-buffer-force
                  (cdr (assoc (match-string 1 label) (nth 1
                                                          xr-data))))
                 (error "Problem with external label %s" label))))
          (setq label (substring label (match-end 1)))
          (reftex-access-scan-info)
          (setq entry 
                (assoc label (symbol-value reftex-docstruct-symbol)))))
    (if (eq how 'echo)
        (reftex-echo-ref label entry (symbol-value reftex-docstruct-symbol))
      (unless entry
        (message "Label %s not known - reparse document might help" label))

      (reftex-pop-to-label label (list (nth 3 entry)) nil t)
      (add-hook 'pre-command-hook 'reftex-highlight-shall-die)

      (when (eq how 'tmp-window)
        ;; Resize window and arrange restauration
        (shrink-window (1- (- (window-height) 9)))
        (recenter '(4))
        (add-hook 'pre-command-hook 'reftex-restore-window-conf))
      (setq pop-win (selected-window))
      (select-window win)
      (goto-char pos)
      (when (equal arg 2)
        (select-window pop-win)))))

(defun reftex-mouse-view-crossref (ev)
  "View cross reference of \\ref or \\cite macro where you click.
If the macro at point is a \\ref, show the corresponding label definition.
If it is a \\cite, show the BibTeX database entry.
If there is no such macro at point, search forward to find one.
With argument, actually select the window showing the cross reference."
  (interactive "e")
  (mouse-set-point ev)
  (reftex-view-crossref current-prefix-arg))

(defvar reftex-auto-view-crossref-timer nil
  "The timer used for auto-view-crossref.")

(defun reftex-view-crossref-when-idle ()
  ;; Display info about crossref at point in echo area or a window.
  ;; This function was desigend to work with an idle timer.
  ;; We try to get out of here as quickly as possible if the call is useless.
  (and reftex-mode
       ;; Quick precheck if this might be a relevant spot
       ;; FIXME: failes with backslash in comment
       (save-excursion  
         (search-backward "\\" nil t)
         (looking-at "\\\\[a-zA-Z]*\\(cite\\|ref\\)"))
       ;; Make sure message area is free if we need it.
       (or (eq reftex-auto-view-crossref 'window) (not (current-message)))
       ;; Make sure we are not already displaying this one
       (not (memq last-command '(reftex-view-crossref
                                 reftex-mouse-view-crossref)))
       (condition-case nil
           (let ((current-prefix-arg nil))
             (cond
              ((eq reftex-auto-view-crossref t)
               (reftex-view-crossref -1 'echo))
              ((eq reftex-auto-view-crossref 'window)
               (reftex-view-crossref -1 'tmp-window))
              (t nil)))
         (error nil))))

(defun reftex-restore-window-conf ()
  (set-window-configuration (get 'reftex-auto-view-crossref 'last-window-conf))
  (put 'reftex-auto-view-crossref 'last-window-conf nil)
  (remove-hook 'pre-command-hook 'reftex-restore-window-conf))
                  
(defun reftex-echo-ref (label entry docstruct)
  ;; Display crossref info in echo area.
  (cond
   ((null docstruct)
    (message (substitute-command-keys (format reftex-no-info-message "ref"))))
   ((null entry)
    (message "ref: unknown label: %s" label))
   (t
    (when (stringp (nth 2 entry))
      (message "ref(%s): %s" (nth 1 entry) (nth 2 entry)))
    (let ((buf (get-buffer " *Echo Area*")))
      (when buf
        (save-excursion
          (set-buffer buf)
          (run-hooks 'reftex-display-copied-context-hook)))))))

(defun reftex-echo-cite (key files item)
  ;; Display citation info in echo area.
  (let* ((cache (assq 'bibview-cache (symbol-value reftex-docstruct-symbol)))
         (cache-entry (assoc key (cdr cache)))
         entry string buf (all-files files))

    (if (and reftex-cache-cite-echo cache-entry)
        ;; We can just use the cache
        (setq string (cdr cache-entry))

      ;; Need to look in the database
      (unless reftex-revisit-to-echo
        (setq files (reftex-visited-files files)))

      (setq entry 
            (condition-case nil
                (save-excursion
                  (reftex-pop-to-bibtex-entry key files nil nil item t))
              (error
               (if (and files (= (length all-files) (length files)))
                   (message "cite: no such database entry: %s" key)
                 (message (substitute-command-keys 
                           (format reftex-no-info-message "cite"))))
               nil)))
      (when entry
        (if item
            (setq string (reftex-nicify-text entry))
          (setq string (reftex-make-cite-echo-string
                        (reftex-parse-bibtex-entry entry)
                        reftex-docstruct-symbol)))))
    (unless (or (null string) (equal string ""))
      (message "cite: %s" string))
    (when (setq buf (get-buffer " *Echo Area*"))
      (save-excursion
        (set-buffer buf)
        (run-hooks 'reftex-display-copied-context-hook)))))

(defun reftex-make-cite-echo-string (entry docstruct-symbol)
  ;; Format a bibtex entry for the echo area and cache the result.
  (let* ((key (reftex-get-bib-field "&key" entry))
         (string 
          (let* ((reftex-cite-punctuation '(" " " & " " etal.")))
            (reftex-format-citation entry reftex-cite-view-format)))
         (cache (assq 'bibview-cache (symbol-value docstruct-symbol)))
         (cache-entry (assoc key (cdr cache))))
    (unless cache
      ;; This docstruct has no cache - make one.
      (set docstruct-symbol (cons (cons 'bibview-cache nil)
                                  (symbol-value docstruct-symbol))))
    (when reftex-cache-cite-echo
      (setq key (copy-sequence key))
      (set-text-properties 0 (length key) nil key)
      (set-text-properties 0 (length string) nil string)
      (if cache-entry
          (unless (string= (cdr cache-entry) string)
            (setcdr cache-entry string)
            (put reftex-docstruct-symbol 'modified t))
        (push (cons key string) (cdr cache))
        (put reftex-docstruct-symbol 'modified t)))
    string))

(defvar reftex-use-itimer-in-xemacs nil
  "*Non-nil means use the idle timers in XEmacs for crossref display.
Currently, idle timer restart is broken and we use the post-command-hook.")

(defun reftex-toggle-auto-view-crossref ()
  "Toggle the automatic display of crossref information in the echo area.
When active, leaving point idle in the argument of a \\ref or \\cite macro
will display info in the echo area."
  (interactive)
  (if reftex-auto-view-crossref-timer
      (progn
        (if (featurep 'xemacs)
            (if reftex-use-itimer-in-xemacs
                (delete-itimer reftex-auto-view-crossref-timer)
              (remove-hook 'post-command-hook 'reftex-start-itimer-once))
          (cancel-timer reftex-auto-view-crossref-timer))
        (setq reftex-auto-view-crossref-timer nil)
        (message "Automatic display of crossref information was turned off"))
    (setq reftex-auto-view-crossref-timer
          (if (featurep 'xemacs)
              (if reftex-use-itimer-in-xemacs
                  (start-itimer "RefTeX Idle Timer"
                                'reftex-view-crossref-when-idle 
                                reftex-idle-time reftex-idle-time t)
                (add-hook 'post-command-hook 'reftex-start-itimer-once)
                nil)
            (run-with-idle-timer
             reftex-idle-time t 'reftex-view-crossref-when-idle)))
    (message "Automatic display of crossref information was turned on")))

(defun reftex-start-itimer-once ()
   (and reftex-mode
        (not (itimer-live-p reftex-auto-view-crossref-timer))
        (setq reftex-auto-view-crossref-timer
              (start-itimer "RefTeX Idle Timer"
                            'reftex-view-crossref-when-idle 
                            reftex-idle-time nil t))))

;;; =========================================================================
;;;
;;; Functions that check out the surroundings

(defun reftex-what-macro (which &optional bound)
  ;; Find out if point is within the arguments of any TeX-macro.
  ;; The return value is either ("\\macro" . (point)) or a list of them.

  ;; If WHICH is nil, immediately return nil.
  ;; If WHICH is 1, return innermost enclosing macro.
  ;; If WHICH is t, return list of all macros enclosing point.
  ;; If WHICH is a list of macros, look only for those macros and return the
  ;;    name of the first macro in this list found to enclose point.
  ;; If the optional BOUND is an integer, bound backwards directed
  ;;    searches to this point.  If it is nil, limit to nearest \section -
  ;;    like statement.

  ;; This function is pretty stable, but can be fooled if the text contains
  ;; things like \macro{aa}{bb} where \macro is defined to take only one
  ;; argument.  As RefTeX cannot know this, the string "bb" would still be
  ;; considered an argument of macro \macro.

  (unless reftex-section-regexp (reftex-compile-variables))
  (catch 'exit
    (if (null which) (throw 'exit nil))
    (let ((bound (or bound (save-excursion (re-search-backward
                                            reftex-section-regexp nil 1)
                                           (point))))
          pos cmd-list cmd cnt cnt-opt entry)
      (save-restriction
        (save-excursion
          (narrow-to-region (max 1 bound) (point-max))
          ;; move back out of the current parenthesis
          (while (condition-case nil
                     (progn (up-list -1) t)
                   (error nil))
            (setq cnt 1 cnt-opt 0)
            ;; move back over any touching sexps
            (while (and (reftex-move-to-previous-arg bound)
                        (condition-case nil
                            (progn (backward-sexp) t)
                          (error nil)))
              (if (eq (following-char) ?\[) (incf cnt-opt))
              (incf cnt))
            (setq pos (point))
            (when (and (or (= (following-char) ?\[)
                           (= (following-char) ?\{))
                       (re-search-backward "\\\\[*a-zA-Z]+\\=" nil t))
              (setq cmd (reftex-match-string 0))
              (when (looking-at "\\\\begin{[^}]*}")
                (setq cmd (reftex-match-string 0)
                      cnt (1- cnt)))
              ;; This does ignore optional arguments.  Very hard to fix.
              (when (setq entry (assoc cmd reftex-env-or-mac-alist))
                (if (> cnt (or (nth 4 entry) 100))
                    (setq cmd nil)))
              (cond
               ((null cmd))
               ((eq t which)
                (push (cons cmd (point)) cmd-list))
               ((or (eq 1 which) (member cmd which))
                (throw 'exit (cons cmd (point))))))
            (goto-char pos)))
        (nreverse cmd-list)))))

(defun reftex-what-environment (which &optional bound)
  ;; Find out if point is inside a LaTeX environment.
  ;; The return value is (e.g.) either ("equation" . (point)) or a list of
  ;; them.

  ;; If WHICH is nil, immediately return nil.
  ;; If WHICH is 1, return innermost enclosing environment.
  ;; If WHICH is t, return list of all environments enclosing point.
  ;; If WHICH is a list of environments, look only for those environments and
  ;;   return the name of the first environment in this list found to enclose
  ;;   point.

  ;; If the optional BOUND is an integer, bound backwards directed searches to
  ;; this point.  If it is nil, limit to nearest \section - like statement.

  (unless reftex-section-regexp (reftex-compile-variables))
  (catch 'exit
    (save-excursion
      (if (null which) (throw 'exit nil))
      (let ((bound (or bound (save-excursion (re-search-backward
                                              reftex-section-regexp nil 1)
                                             (point))))
            env-list end-list env)
        (while (re-search-backward "\\\\\\(begin\\|end\\){\\([^}]+\\)}"
                                   bound t)
          (setq env (buffer-substring-no-properties
                     (match-beginning 2) (match-end 2)))
          (cond
           ((string= (match-string 1) "end")
            (add-to-list 'end-list env))
           ((member env end-list)
            (setq end-list (delete env end-list)))
           ((eq t which)
            (push (cons env (point)) env-list))
           ((or (eq 1 which) (member env which))
            (throw 'exit (cons env (point))))))
        (nreverse env-list)))))

;;; =========================================================================
;;;
;;; Finding files

(defun reftex-find-tex-file (file master-dir &optional die)
  ;; Find FILE in MASTER-DIR or on reftex-tex-path.
  ;; FILE may be given with or without the .tex extension.
  (let ((rec-values '(nil t)) path file1 old-path)
    (if (file-name-absolute-p file)
        (if (file-regular-p (concat file ".tex"))
            (setq file1 (concat file ".tex"))
          (if (file-regular-p file) (setq file1 file)))
      (while (and (null file1) rec-values)
        (setq path (reftex-access-search-path
                    "tex" (pop rec-values) master-dir file))
        (if (or (null old-path)
                (not (eq old-path path)))
            (setq old-path path
                  path (cons master-dir path)
                  file1 (or (reftex-find-file-on-path 
                             (concat file ".tex") path master-dir)
                            (reftex-find-file-on-path file path master-dir))))))
    (cond (file1 file1)
          (die (error "No such file: %s" file) nil)
          (t (message "No such file: %s (ignored)" file) nil))))

(defun reftex-find-bib-file (file master-dir &optional die)
  ;; Find FILE in MASTER-DIR or on reftex-bib-path
  (let ((rec-values '(nil t)) path file1 old-path)
    (if (file-name-absolute-p file)
        (if (file-regular-p file) (setq file1 file))
      (while (and (null file1) rec-values)
        (setq path (reftex-access-search-path 
                    "bib" (pop rec-values) master-dir file))
        (if (or (null old-path)
                (not (eq old-path path)))
            (setq old-path path
                  path (cons master-dir path)
                  file1 (reftex-find-file-on-path file path master-dir)))))
    (cond (file1 file1)
          (die (error "No such file: %s" file) nil)
          (t (message "No such file: %s (ignored)" file) nil))))

(defun reftex-access-search-path (which &optional recurse master-dir file)
  ;; Access path from environment variables.  WHICH is either "tex" or "bib".
  ;; When RECURSE is t, expand path elements ending in `//' recursively.
  ;; Relative path elements are left as they are.  However, relative recursive
  ;; elements are expanded with MASTER-DIR as default directory.
  ;; The expanded path is cached for the next search.
  ;; FILE is just for the progress message.
  ;; Returns the derived path.
  (let* ((pathvar (intern (concat "reftex-" which "-path"))))
    (when (null (get pathvar 'status))
      ;; Get basic path from environment
      (let ((env-vars (if (equal which "tex") (list "TEXINPUTS")
                        reftex-bibpath-environment-variables)))
        (set pathvar (reftex-parse-colon-path
                      (mapconcat (lambda(x) (or (getenv x) ""))
                                 env-vars path-separator))))
      (put pathvar 'status 'split)
      ;; Check if we have recursive elements
      (let ((path (symbol-value pathvar)) dir rec)
        (while (setq dir (pop path))
          (when (string= (substring dir -2) "//")
            (if (file-name-absolute-p dir)
                (setq rec (or rec 'absolute))
              (setq rec 'relative))))
        (put pathvar 'rec-type rec)))

    (if recurse
        ;; Return the recursive expansion of the path
        (cond
         ((not (get pathvar 'rec-type))
          ;; Path does not contain recursive elements - use simple path
          (symbol-value pathvar))
         ((or (not (get pathvar 'recursive-path))
              (and (eq (get pathvar 'rec-type) 'relative)
                   (not (equal master-dir (get pathvar 'master-dir)))))
          ;; Either: We don't have a recursive expansion yet.
          ;; or:     Relative recursive path elements need to be expanded
          ;;         relative to new default directory
          (message "Expanding search path to find %s file: %s ..." which file)
          (put pathvar 'recursive-path 
               (reftex-expand-path (symbol-value pathvar) master-dir))
          (put pathvar 'master-dir master-dir)
          (get pathvar 'recursive-path))
         (t 
          ;; Recursive path computed earlier is still OK.
          (get pathvar 'recursive-path)))
      ;; The simple path was requested
      (symbol-value pathvar))))

(defun reftex-find-file-on-path (file path &optional def-dir)
  ;; Find FILE along the directory list PATH.
  ;; DEF-DIR is the default directory for expanding relative path elements.
  (catch 'exit
    (when (file-name-absolute-p file)
      (if (file-regular-p file)
          (throw 'exit file)
        (throw 'exit nil)))
    (let* ((thepath path) file1 dir )
      (while (setq dir (pop thepath))
        (when (string= (substring dir -2) "//")
          (setq dir (substring dir 0 -1)))
        (setq file1 (expand-file-name file (expand-file-name dir def-dir)))
        (if (file-regular-p file1)
            (throw 'exit file1)))
      ;; No such file
      nil)))

(defun reftex-parse-colon-path (path)
  ;; Like parse-colon-parse, but // or /~ are left alone.
  ;; Trailing ! or !! will be converted into `//' (emTeX convention)
  (mapcar
   (lambda (dir)
     (if (string-match "\\(//+\\|/*!+\\)\\'" dir) 
         (setq dir (replace-match "//" t t dir)))
     (file-name-as-directory dir))
   (delete "" (split-string path (concat path-separator "+")))))

(defun reftex-expand-path (path &optional default-dir)
  ;; Expand parts of path ending in `//' recursively into directory list.
  ;; Relative recursive path elements are expanded relative to DEFAULT-DIR.
  (let (path1 dir recursive)
    (while (setq dir (pop path))
      (if (setq recursive (string= (substring dir -2) "//"))
          (setq dir (substring dir 0 -1)))
      (if (and recursive
               (not (file-name-absolute-p dir)))
          (setq dir (expand-file-name dir default-dir)))
      (if recursive
          ;; Expand recursively
          (setq path1 (append (reftex-recursive-directory-list dir) path1))
        ;; Keep unchanged
        (push dir path1)))
    (nreverse path1)))

(defun reftex-recursive-directory-list (dir)
  ;; Return a list of all directories below DIR, including DIR itself
  (let ((path (list dir)) path1 file files)
    (while (setq dir (pop path))
      (when (file-directory-p dir)
        (setq files (nreverse (directory-files dir t "[^.]")))
        (while (setq file (pop files))
          (if (file-directory-p file) 
              (push (file-name-as-directory file) path)))
        (push dir path1)))
    path1))

;;; =========================================================================
;;;
;;; Some generally useful functions

(defun reftex-no-props (string)
  ;; Return STRING with all text properties removed
  (and (stringp string)
       (set-text-properties 0 (length string) nil string))
  string)

(defun reftex-match-string (n)
  ;; Match string without properties
  (when (match-beginning n)
    (buffer-substring-no-properties (match-beginning n) (match-end n))))

(defun reftex-kill-buffer (buffer)
  ;; Kill buffer if it exists.
  (and (setq buffer (get-buffer buffer))
       (kill-buffer buffer)))

(defun reftex-erase-buffer (&optional buffer)
  ;; Erase BUFFER if it exists.  BUFFER defaults to current buffer.
  ;; This even erases read-only buffers.
  (cond
   ((null buffer)
    ;; erase current buffer
    (let ((buffer-read-only nil)) (erase-buffer)))
   ((setq buffer (get-buffer buffer))
    ;; buffer exists
    (save-excursion
      (set-buffer buffer)
      (let ((buffer-read-only nil)) (erase-buffer))))))

(defun reftex-this-word (&optional class)
  ;; Grab the word around point.
  (setq class (or class "-a-zA-Z0-9:_/.*;|"))
  (save-excursion
    (buffer-substring-no-properties
     (progn (skip-chars-backward class) (point))
     (progn (skip-chars-forward  class) (point)))))

(defun reftex-all-assq (key list)
  ;; Return a list of all associations of KEY in LIST.  Comparison with eq.
  (let (rtn)
    (while (setq list (memq (assq key list) list))
      (push (car list) rtn)
      (pop list))
    (nreverse rtn)))

(defun reftex-all-assoc-string (key list)
  ;; Return a list of all associations of KEY in LIST.  Comparison with string=.
  (let (rtn)
    (while list
      (if (string= (car (car list)) key)
          (push (car list) rtn))
      (pop list))
    (nreverse rtn)))

(defun reftex-last-assoc-before-elt (key elt list)
  ;; Find the last association of KEY in LIST before or at ELT
  ;; ELT is found in LIST with equal, not eq.
  ;; Returns nil when either KEY or elt are not found in LIST.
  ;; On success, returns the association.
  (let* ((elt (car (member elt list))) ass last-ass)

    (while (and (setq ass (assoc key list))
                (setq list (memq ass list))
                (memq elt list))
      (setq last-ass ass
            list (cdr list)))
    last-ass))

(defvar enable-multibyte-characters)
(defun reftex-truncate (string ncols &optional ellipses padding)
  ;; Truncate a string to NCHAR characters.  
  ;; Works fast with ASCII and correctly with Mule characters.
  ;; When ELLIPSES is non-nil, put three dots at the end of the string.
  ;; When padding is non-nil, fills with white space to NCOLS characters.
  (setq string
        (cond
         ((and (boundp 'enable-multibyte-characters)
               enable-multibyte-characters
               (fboundp 'string-width)
               (fboundp 'truncate-string-to-width))
          (if (<= (string-width string) ncols)
              string
            (if ellipses
                (concat (truncate-string-to-width string (- ncols 3)) "...")
              (truncate-string-to-width string ncols))))
         (t
          (if (<= (length string) ncols)
              string
            (if ellipses
                (concat (substring string 0 (- ncols 3)) "...")
              (substring string 0 ncols))))))
  (if padding
      (format (format "%%-%ds" ncols) string)
    string))

(defun reftex-nearest-match (regexp &optional pos)
  ;; Find the nearest match of REGEXP.  Set the match data.
  ;; If POS is given, calculate distances relative to it.
  ;; Return nil if there is no match.
  (let ((start (point)) (pos (or pos (point))) match1 match2 match)
    (goto-char start)
    (when (re-search-backward regexp nil t)
      (setq match1 (match-data)))
    (goto-char start)
    (when (re-search-forward regexp nil t)
      (setq match2 (match-data)))
    (goto-char start)
    (setq match
          (cond
           ((not match1) match2)
           ((not match2) match1)
           ((< (abs (- pos (car match1))) (abs (- pos (car match2)))) match1)
           (t match2)))
    (if match (progn (set-match-data match) t) nil)))

(defun reftex-auto-mode-alist ()
  ;; Return an `auto-mode-alist' with only the .gz (etc) thingies.
  ;; Stolen from gnus nnheader.
  (let ((alist auto-mode-alist)
        out)
    (while alist
      (when (listp (cdr (car alist)))
        (push (car alist) out))
      (pop alist))
    (nreverse out)))

(defun reftex-enlarge-to-fit (buf2 &optional keep-current)
  ;; Enlarge other window displaying buffer to show whole buffer if possible.
  ;; If KEEP-CURRENT in non-nil, current buffer must remain visible.
  (let* ((win1 (selected-window))
         (buf1 (current-buffer))
         (win2 (get-buffer-window buf2)))
    (when win2
      (select-window win2)
      (unless (and (pos-visible-in-window-p 1)
                   (pos-visible-in-window-p (point-max)))
        (enlarge-window (1+ (- (count-lines 1 (point-max))
                               (window-height))))))
    (cond
     ((window-live-p win1) (select-window win1))
     (keep-current
      ;; we must have the old buffer!
      (switch-to-buffer-other-window buf1)
      (shrink-window (- (window-height) window-min-height))))))

(defun reftex-select-with-char (prompt help-string &optional delay-time scroll)
  ;; Offer to select something with PROMPT and, after DELAY-TIME seconds,
  ;; also with HELP-STRING.
  ;; When SCROLL is non-nil, use SPC and DEL to scroll help window.
  (let ((char ?\?))
    (save-window-excursion
      (catch 'exit
        (message (concat prompt "   (?=Help)"))
        (when (or (sit-for (or delay-time 0))
                  (= ?\? (setq char (read-char-exclusive))))
          (with-output-to-temp-buffer " *RefTeX Help*"
            (princ help-string))
          (reftex-enlarge-to-fit " *RefTeX Help*")
          (select-window (get-buffer-window " *RefTeX Help*"))
          (setq truncate-lines t))
        (setq prompt (concat prompt (if scroll "   (SPC/DEL=Scroll)" "")))
        (message prompt)
        (and (equal char ?\?) (setq char (read-char-exclusive)))
        (while t
          (cond ((equal char ?\C-g) (keyboard-quit))
                ((equal char ?\?))
                ((and scroll (equal char ?\ ))
                 (condition-case nil (scroll-up) (error nil))
                 (message prompt))
                ((and scroll (equal char ?\C-? ))
                 (condition-case nil (scroll-down) (error nil))
                 (message prompt))
                (t (throw 'exit char)))
          (setq char (read-char-exclusive)))))))

(defun reftex-make-regexp-allow-for-ctrl-m (string)
  ;; convert STRING into a regexp, allowing ^M for \n and vice versa
  (let ((start -2))
    (setq string (regexp-quote string))
    (while (setq start (string-match "[\n\r]" string (+ 3 start)))
      (setq string (replace-match "[\n\r]" nil t string)))
    string))

(defun reftex-get-buffer-visiting (file)
  ;; return a buffer visiting FILE
  (cond
   ((boundp 'find-file-compare-truenames) ; XEmacs
    (let ((find-file-compare-truenames t))
      (get-file-buffer file)))
   ((fboundp 'find-buffer-visiting)       ; Emacs
    (find-buffer-visiting file))
   (t (error "This should not happen (reftex-get-buffer-visiting)"))))

;; Define `current-message' for compatibility with XEmacs prior to 20.4
(defvar message-stack)
(if (and (featurep 'xemacs)
         (not (fboundp 'current-message)))
    (defun current-message (&optional frame)
      (cdr (car message-stack))))

(defun reftex-visited-files (list)
  ;; Takes a list of filenames and returns the buffers of those already visited
  (delq nil (mapcar (lambda (x) (if (reftex-get-buffer-visiting x) x nil))
                    list)))

(defun reftex-get-file-buffer-force (file &optional mark-to-kill)
  ;; Return a buffer visiting file.  Make one, if necessary.
  ;; If neither such a buffer nor the file exist, return nil.
  ;; If MARK-TO-KILL is t and there is no live buffer, visit the file with
  ;; initializations according to `reftex-initialize-temporary-buffers',
  ;; and mark the buffer to be killed after use.

  (let ((buf (reftex-get-buffer-visiting file)))

    (cond (buf
           ;; We have it already as a buffer - just return it
           buf)

          ((file-readable-p file)
           ;; At least there is such a file and we can read it.

           (if (or (not mark-to-kill)
                   (eq t reftex-initialize-temporary-buffers))

               ;; Visit the file with full magic
               (setq buf (find-file-noselect file))

             ;; Else: Visit the file just briefly, without or
             ;;       with limited Magic

             ;; The magic goes away
             (let ((format-alist nil)
                   (auto-mode-alist (reftex-auto-mode-alist))
                   (default-major-mode 'fundamental-mode)
                   (enable-local-variables nil)
                   (after-insert-file-functions nil))
               (setq buf (find-file-noselect file)))

             ;; Is there a hook to run?
             (when (listp reftex-initialize-temporary-buffers)
               (save-excursion
                 (set-buffer buf)
                 (run-hooks 'reftex-initialize-temporary-buffers))))

           ;; Lets see if we got a license to kill :-|
           (and mark-to-kill
                (add-to-list 'reftex-buffers-to-kill buf))

           ;; Return the new buffer
           buf)

          ;; If no such file exists, return nil
          (t nil))))

(defun reftex-kill-temporary-buffers (&optional buffer)
  ;; Kill all buffers in the list reftex-kill-temporary-buffers.
  (cond
   (buffer
    (when (member buffer reftex-buffers-to-kill)
      (kill-buffer buffer)
      (setq reftex-buffers-to-kill
            (delete buffer reftex-buffers-to-kill))))
   (t
    (while (setq buffer (pop reftex-buffers-to-kill))
      (when (bufferp buffer)
        (and (buffer-modified-p buffer)
             (y-or-n-p (format "Save file %s? "
                               (buffer-file-name buffer)))
             (save-excursion
               (set-buffer buffer)
               (save-buffer)))
        (kill-buffer buffer))
      (pop reftex-buffers-to-kill)))))

(defun reftex-splice-symbols-into-list (list alist)
  ;; Splice the association in ALIST of any symbols in LIST into the list.
  ;; Return new list.
  (let (rtn tmp)
    (while list
      (while (and (not (null (car list)))  ;; keep list elements nil
                  (symbolp (car list)))
        (setq tmp (car list))
        (cond
         ((assoc tmp alist)
          (setq list (append (nth 2 (assoc tmp alist)) (cdr list))))
         (t
          (error "Cannot treat symbol %s in reftex-label-alist"
                 (symbol-name tmp)))))
      (push (pop list) rtn))
    (nreverse rtn)))

(defun reftex-uniquify-by-car (alist &optional keep-list)
  ;; Return a list of all elements in ALIST, but each car only once.
  ;; Elements of KEEP-LIST are not removed even if duplicate.
  (let (new elm)
    (while alist
      (setq elm (pop alist))
      (if (or (member (car elm) keep-list)
              (not (assoc (car elm) new)))
          (push elm new)))
    (nreverse new)))

;;; =========================================================================
;;;
;;; Fontification and Highlighting

(defun reftex-use-fonts ()
  ;; Return t if we can and want to use fonts.
  (and window-system
       reftex-use-fonts
       (featurep 'font-lock)))

(defun reftex-refontify ()
  ;; Return t if we need to refontify context
  (and (reftex-use-fonts)
       (or (eq t reftex-refontify-context)
           (and (eq 1 reftex-refontify-context)
                ;; Test of we use the font-lock version of x-symbol
                (and (featurep 'x-symbol-tex) (not (boundp 'x-symbol-mode)))))))

(defun reftex-fontify-select-label-buffer (parent-buffer)
  ;; Fontify the `*RefTeX Select*' buffer.  Buffer is temporarily renamed to
  ;; start with none-SPC char, beacuse Font-Lock otherwise refuses operation.
  (run-hook-with-args 'reftex-pre-refontification-functions
                      parent-buffer 'reftex-ref)
  (let* ((oldname (buffer-name))
         (newname (concat "Fontify-me-" oldname)))
    (unwind-protect
        (progn
          ;; Rename buffer temporarily to start w/o space (because of font-lock)
          (rename-buffer newname t)
          (cond
           ((fboundp 'font-lock-default-fontify-region)
            ;; Good: we have the indirection functions
            (set (make-local-variable 'font-lock-fontify-region-function)
                 'reftex-select-font-lock-fontify-region)
            (let ((major-mode 'latex-mode))
              (font-lock-mode 1)))
           ((fboundp 'font-lock-set-defaults-1)
            ;; Looks like the XEmacs font-lock stuff.
            ;; FIXME: this is still kind of a hack.
            (set (make-local-variable 'font-lock-keywords) nil)
            (let ((major-mode 'latex-mode)
                  (font-lock-defaults-computed nil))
              (font-lock-set-defaults-1)
              (reftex-select-font-lock-fontify-region (point-min) (point-max))))
           (t
            ;; Oops? 
            (message "Sorry: cannot refontify RefTeX Select buffer."))))
      (rename-buffer oldname))))

(defun reftex-select-font-lock-fontify-region (beg end &optional loudly)
  ;; Fontify a region, but only lines starting with a dot.
  (let ((func (if (fboundp 'font-lock-default-fontify-region)
                  'font-lock-default-fontify-region
                'font-lock-fontify-region))
        beg1 end1)
    (goto-char beg)
    (while (re-search-forward "^\\." end t)
      (setq beg1 (point) end1 (progn (skip-chars-forward "^\n") (point)))
      (funcall func beg1 end1 nil)
      (goto-char end1))))

(defun reftex-select-font-lock-unfontify (&rest ignore) t)

(defun reftex-verified-face (&rest faces)
  ;; Return the first valid face in FACES, or nil if none is valid.
  ;; Also, when finding a nil element in FACES, return nil.  This
  ;; function is just a safety net to catch name changes of builtin
  ;; fonts. Currently it is only used for reftex-label-face, which has
  ;; as default font-lock-reference-face, which was recently renamed
  ;; to font-lock-constant-face.
  (let (face)
    (catch 'exit
      (while (setq face (pop faces))
        (if (featurep 'xemacs)
            (if (find-face face) (throw 'exit face))
          (if (facep face) (throw 'exit face)))))))

;; Highlighting uses overlays.  For XEmacs, we need the emulation.
(if (featurep 'xemacs) (require 'overlay))

;; We keep a vector with several different overlays to do our highlighting.
(defvar reftex-highlight-overlays [nil nil])

;; Initialize the overlays
(aset reftex-highlight-overlays 0 (make-overlay 1 1))
(overlay-put (aref reftex-highlight-overlays 0) 
             'face 'highlight)
(aset reftex-highlight-overlays 1 (make-overlay 1 1))
(overlay-put (aref reftex-highlight-overlays 1)
             'face reftex-cursor-selected-face)

;; Two functions for activating and deactivation highlight overlays
(defun reftex-highlight (index begin end &optional buffer)
  "Highlight a region with overlay INDEX."
  (move-overlay (aref reftex-highlight-overlays index)
                begin end (or buffer (current-buffer))))
(defun reftex-unhighlight (index)
  "Detach overlay INDEX."
  (delete-overlay (aref reftex-highlight-overlays index)))

(defun reftex-highlight-shall-die ()
  ;; Function used in pre-command-hook to remove highlights.
  (remove-hook 'pre-command-hook 'reftex-highlight-shall-die)
  (reftex-unhighlight 0))

;;; =========================================================================
;;;
;;; Functions to compile the tables, reset the mode etc.

;; A list of all variables in the cache.
;; The cache is used to save the compiled versions of some variables.
(defconst reftex-cache-variables 
  '(reftex-memory ;; This MUST ALWAYS be the first!
    reftex-env-or-mac-alist reftex-everything-regexp
    reftex-find-label-regexp-format reftex-find-label-regexp-format2
    reftex-label-env-list reftex-label-mac-list
    reftex-section-or-include-regexp reftex-section-levels-all
    reftex-section-regexp reftex-type-query-help
    reftex-type-query-prompt reftex-typekey-list
    reftex-typekey-to-format-alist reftex-typekey-to-prefix-alist
    reftex-words-to-typekey-alist))

(defun reftex-ensure-compiled-variables ()
  ;; Recompile the label alist when necessary
  (let* ((mem reftex-memory)
         (cache (get reftex-docstruct-symbol 'reftex-cache))
         (cmem  (car cache))
         (alist reftex-label-alist)
         (levels (get reftex-docstruct-symbol 'reftex-section-levels))
         (style (get reftex-docstruct-symbol 'reftex-label-alist-style))
         (default reftex-default-label-alist-entries))
    (cond
     (reftex-tables-dirty (reftex-compile-variables))
     ((and (eq alist   (nth 0 mem))
           (eq levels  (nth 1 mem))
           (eq style   (nth 2 mem))
           (eq default (nth 3 mem))))  ;; everything is OK
     ((and (eq alist   (nth 0 cmem))
           (eq levels  (nth 1 cmem))
           (eq style   (nth 2 cmem))
           (eq default (nth 2 cmem)))
      ;; restore the cache
      (message "Restoring cache")
      (mapcar (lambda (sym) (set sym (pop cache))) reftex-cache-variables))
     (t (reftex-compile-variables)))))

(defun reftex-reset-mode ()
  "Reset RefTeX Mode.  
This will re-compile the configuration information and remove all
current scanning information and the parse file to enforce a rescan
on next use."
  (interactive)

  ;; Reset the file search path variables
  (loop for prop in '(status master-dir recursive-path rec-type) do
        (put 'reftex-tex-path prop nil)
        (put 'reftex-bib-path prop nil))

  ;; Kill temporary buffers associated with RefTeX - just in case they
  ;; were not cleaned up properly
  (save-excursion
    (let ((buffer-list '("*RefTeX Help*" "*RefTeX Select*"
                         "*Duplicate Labels*" "*toc*" " *RefTeX-scratch*"))
          buf)
      (while (setq buf (pop buffer-list))
        (if (get-buffer buf)
            (kill-buffer buf))))
    (reftex-erase-all-selection-buffers))

  ;; Make sure the current document will be rescanned soon.
  (reftex-reset-scanning-information)

  ;; Remove any parse info file
  (reftex-access-parse-file 'kill)

  ;; Plug functions into AUCTeX if the user option says so.
  (and reftex-plug-into-AUCTeX
       (reftex-plug-into-AUCTeX))

  (reftex-compile-variables))

(defun reftex-reset-scanning-information ()
  "Reset the symbols containing information from buffer scanning.
This enforces rescanning the buffer on next use."
  (if (string= reftex-last-toc-master (reftex-TeX-master-file))
      (reftex-erase-buffer "*toc*"))
  (let ((symlist reftex-multifile-symbols)
        symbol)
    (while symlist
      (setq symbol (car symlist)
            symlist (cdr symlist))
      (if (and (symbolp (symbol-value symbol))
               (not (null (symbol-value symbol))))
          (set (symbol-value symbol) nil)))))

(defun reftex-erase-all-selection-buffers ()
  ;; Remove all selection buffers associated with current document.
  (mapcar 
   (lambda (type)
     (reftex-erase-buffer (reftex-make-selection-buffer-name type)))
   reftex-typekey-list))

(defun reftex-compile-variables ()
  ;; Compile the information in reftex-label-alist & Co.

  (message "Compiling label environment definitions...")

  ;; Update AUCTeX style information
  (when (and (featurep 'tex-site) (fboundp 'TeX-update-style))
    (condition-case nil (TeX-update-style) (error nil)))

  ;; Record that we have done this, and what we have used.
  (setq reftex-tables-dirty nil)
  (setq reftex-memory 
        (list reftex-label-alist
              (get reftex-docstruct-symbol 'reftex-section-levels)
              (get reftex-docstruct-symbol 'reftex-label-alist-style)
              reftex-default-label-alist-entries))

  ;; Compile information in reftex-label-alist
  (let ((all (reftex-uniquify-by-car
              (reftex-splice-symbols-into-list
               (append reftex-label-alist
                       (get reftex-docstruct-symbol 'reftex-label-alist-style)
                       reftex-default-label-alist-entries)
               reftex-label-alist-builtin)
              '(nil)))
        entry env-or-mac typekeychar typekey prefix context word
        fmt reffmt labelfmt wordlist qh-list macros-with-labels
        nargs nlabel opt-args cell sum i)

    (setq reftex-words-to-typekey-alist nil
          reftex-typekey-list nil
          reftex-typekey-to-format-alist nil
          reftex-typekey-to-prefix-alist nil
          reftex-env-or-mac-alist nil
          reftex-label-env-list nil
          reftex-label-mac-list nil)
    (while all
      (catch 'next-entry
        (setq entry (car all)
              env-or-mac (car entry)
              entry (cdr entry)
              all (cdr all))
        (if (null env-or-mac)
            (setq env-or-mac ""))
        (if (stringp (car entry))
            ;; This is before version 2.00 - convert entry to new format
            ;; This is just to keep old users happy
            (setq entry (cons (string-to-char (car entry))
                              (cons (concat (car entry) ":")
                                    (cdr entry)))))
        (setq typekeychar (nth 0 entry)
              typekey (if typekeychar (char-to-string typekeychar) nil)
              prefix (nth 1 entry)
              fmt (nth 2 entry)
              context (nth 3 entry)
              wordlist (nth 4 entry))
        (if (stringp wordlist)
            ;; This is before version 2.04 - convert to new format
            (setq wordlist (nthcdr 4 entry)))

        (if (and (stringp fmt)
                 (string-match "@" fmt))
            ;; Special syntax for specifying a label format
            (setq fmt (split-string fmt "@+"))
          (setq fmt (list "\\label{%s}" fmt)))
        (setq labelfmt (car fmt)
              reffmt (nth 1 fmt))
        ;; Note a new typekey
        (if typekey
            (add-to-list 'reftex-typekey-list typekey))
        (if (and typekey prefix
                 (not (assoc typekey reftex-typekey-to-prefix-alist)))
            (add-to-list 'reftex-typekey-to-prefix-alist
                         (cons typekey prefix)))
        ;; Check if this is a macro or environment
        (cond
         ((string-match "\\`\\\\" env-or-mac)
          ;; It's a macro
          (let ((result (reftex-parse-args env-or-mac)))
            (setq env-or-mac (or (first result) env-or-mac)
                  nargs (second result)
                  nlabel (third result)
                  opt-args (fourth result))
            (if nlabel (add-to-list 'macros-with-labels env-or-mac)))
          (if typekey (add-to-list 'reftex-label-mac-list env-or-mac)))
         (t
          ;; It's an environment
          (setq nargs nil nlabel nil opt-args nil)
          (cond ((string= env-or-mac "any"))
                ((string= env-or-mac ""))
                ((string= env-or-mac "section"))
                (t
                 (add-to-list 'reftex-label-env-list env-or-mac)))))
        ;; Translate some special context cases
        (when (assq context reftex-default-context-regexps)
          (setq context 
                (format 
                 (cdr (assq context reftex-default-context-regexps))
                 (regexp-quote env-or-mac))))
        ;; See if this is the first format for this typekey
        (and reffmt
             (not (assoc typekey reftex-typekey-to-format-alist))
             (push (cons typekey reffmt) reftex-typekey-to-format-alist))
        ;; See if this is the first definition for this env-or-mac
        (and (not (string= env-or-mac "any"))
             (not (string= env-or-mac ""))
             (not (assoc env-or-mac reftex-env-or-mac-alist))
             (push (list env-or-mac typekey context labelfmt
                         nargs nlabel opt-args)
                   reftex-env-or-mac-alist))
        ;; Are the magic words regular expressions?  Quote normal words.
        (if (eq (car wordlist) 'regexp)
            (setq wordlist (cdr wordlist))
          (setq wordlist (mapcar 'regexp-quote wordlist)))
        ;; Remember the first association of each word.
        (while (stringp (setq word (pop wordlist)))
          (or (assoc word reftex-words-to-typekey-alist)
              (push (cons word typekey) reftex-words-to-typekey-alist)))
        (cond
         ((string= "" env-or-mac) nil)
         ((setq cell (assoc typekey qh-list))
          (push env-or-mac (cdr cell)))
         (typekey
          (push (list typekey env-or-mac) qh-list)))))

    (setq reftex-typekey-to-prefix-alist
          (nreverse reftex-typekey-to-prefix-alist))

    ;; Prepare the typekey query prompt and help string.
    (setq qh-list 
          (sort qh-list (function 
                         (lambda (x1 x2) (string< (car x1) (car x2))))))
    (setq reftex-type-query-prompt
          (concat "Label type: ["
                  (mapconcat (function (lambda(x) (format "%s" (car x))))
                             qh-list "")
                  "]"))
    ;; In the help string, we need to wrap lines...
    (setq reftex-type-query-help
          (concat 
           "SELECT A LABEL TYPE:\n--------------------\n"
           (mapconcat
            (lambda(x)
              (setq sum 0)
              (format " [%s]   %s"
                      (car x)
                      (mapconcat (lambda(env)
                                   (setq sum (+ sum (length env)))
                                   (if (< sum 60)
                                       env
                                     (setq sum 0)
                                     (concat "\n       " env)))
                                 (cdr x) " ")))
            qh-list "\n")))

    ;; Convert magic words to regular expressions.  We make regular expressions
    ;; which allow for some chars from the ref format to be in the buffer.
    ;; These characters will be seen and removed.
    (setq reftex-words-to-typekey-alist
          (mapcar 
           (lambda (x)
             (setq word (car x)
                   typekey (cdr x)
                   fmt (cdr (assoc typekey reftex-typekey-to-format-alist)))
             (setq word (concat "\\W\\(" word "[ \t\n\r]*\\)\\("))
             (setq i 0)
             (while (and (< i 10)   ; maximum number of format chars allowed
                         (< i (length fmt))
                         (not (member (aref fmt i) '(?%))))
               (setq word (concat word "\\|" (regexp-quote
                                              (substring fmt 0 (1+ i)))))
               (incf i))
             (cons (concat word "\\)\\=") typekey))
           (nreverse reftex-words-to-typekey-alist)))

    ;; Make the full list of section levels
    (setq reftex-section-levels-all
          (append (get reftex-docstruct-symbol 'reftex-section-levels)
                  reftex-section-levels))

    ;; Calculate the regular expressions
    (let* ((wbol "\\(\\`\\|[\n\r]\\)[ \t]*")
           (label-re "\\\\label{\\([^}]*\\)}")
           (include-re (concat wbol "\\\\\\(include\\|input\\)[{ \t]+\\([^} \t\n\r]+\\)"))
           (section-re
            (concat wbol "\\\\\\("
                    (mapconcat 'car reftex-section-levels-all "\\|")
                    "\\)\\*?\\(\\[[^]]*\\]\\)?{"))
           (appendix-re (concat wbol "\\(\\\\appendix\\)"))
           (macro-re
            (if macros-with-labels
                (concat "\\("
                        (mapconcat 'regexp-quote macros-with-labels "\\|")
                        "\\)[[{]")
              ""))
           (find-label-re-format
            (concat "\\("
                    (mapconcat 'regexp-quote (append '("\\label")
                                                     macros-with-labels) "\\|")
                    "\\)\\([[{][^]}]*[]}]\\)*[[{]\\(%s\\)[]}]")))
      (setq reftex-section-regexp section-re
            reftex-section-or-include-regexp
            (concat section-re "\\|" include-re)
            reftex-everything-regexp
            (concat label-re "\\|" section-re "\\|" include-re
                    "\\|" appendix-re
                    (if macros-with-labels "\\|" "") macro-re)
            reftex-find-label-regexp-format find-label-re-format
            reftex-find-label-regexp-format2 
            "\\([]} \t\n\r]\\)\\([[{]\\)\\(%s\\)[]}]")
      (message "Compiling label environment definitions...done")))
  (put reftex-docstruct-symbol 'reftex-cache
       (mapcar 'symbol-value reftex-cache-variables)))

;;; =========================================================================
;;;
;;; Operations on entire Multifile documents

(defun reftex-create-tags-file ()
  "Create TAGS file by running `etags' on the current document.
The TAGS file is also immediately visited with `visit-tags-table'."
  (interactive)
  (reftex-access-scan-info current-prefix-arg)
  (let* ((master (reftex-TeX-master-file))
         (files  (reftex-all-document-files))
         (cmd    (format "etags %s" (mapconcat 'identity files " "))))
    (save-excursion
      (set-buffer (reftex-get-buffer-visiting master))
      (message "Running etags to create TAGS file...")
      (shell-command cmd)
      (visit-tags-table "TAGS"))))

;; History of grep commands.
(defvar reftex-grep-history nil)
(defvar reftex-grep-command "grep -n "
  "Last grep command used in \\[reftex-grep-document]; default for next grep.")

(defun reftex-grep-document (grep-cmd)
  "Run grep query through all files related to this document.
With prefix arg, force to rescan document.
No active TAGS table is required."

  (interactive
   (list (read-from-minibuffer "Run grep on document (like this): "
                               reftex-grep-command nil nil
                               'reftex-grep-history)))
  (reftex-access-scan-info current-prefix-arg)
  (let* ((files  (reftex-all-document-files t))
         (cmd    (format
                  "%s %s" grep-cmd
                  (mapconcat 'identity files " "))))
    (grep cmd)))

(defun reftex-search-document (&optional regexp)
  "Regexp search through all files of the current TeX document.
Starts always in the master file.  Stops when a match is found.
To continue searching for next match, use command \\[tags-loop-continue].
No active TAGS table is required."
  (interactive)
  (let ((default (reftex-this-word)))
    (unless regexp
      (setq regexp (read-string (format "Search regexp in document [%s]: "
                                        default))))
    (if (string= regexp "") (setq regexp (regexp-quote default)))

    (reftex-access-scan-info current-prefix-arg)
    (tags-search regexp (list 'reftex-all-document-files))))

(defun reftex-query-replace-document (&optional from to delimited)
  "Run a query-replace-regexp of FROM with TO over the entire TeX document.
Third arg DELIMITED (prefix arg) means replace only word-delimited matches.
If you exit (\\[keyboard-quit] or ESC), you can resume the query replace
with the command \\[tags-loop-continue].
No active TAGS table is required."
  (interactive)
  (let ((default (reftex-this-word)))
    (unless from
      (setq from (read-string (format "Replace regexp in document [%s]: "
                                      default)))
      (if (string= from "") (setq from (regexp-quote default))))
    (unless to
      (setq to (read-string (format "Replace regexp %s with: " from))))
    (reftex-access-scan-info current-prefix-arg)
    (tags-query-replace from to (or delimited current-prefix-arg)
                        (list 'reftex-all-document-files))))

(defun reftex-find-duplicate-labels ()
  "Produce a list of all duplicate labels in the document."

  (interactive)

  ;; Rescan the document to make sure
  (reftex-access-scan-info t)

  (let ((master (reftex-TeX-master-file))
        (cnt 0)
        (dlist
         (mapcar
          (function
           (lambda (x)
             (let (x1)
               (cond
                ((memq (car x)
                       '(toc bof eof bib thebib label-numbers xr xr-doc
                             master-dir file-error bibview-cache appendix
                             is-multi))
                 nil)
                (t
                 (setq x1 (reftex-all-assoc-string
                           (car x) (symbol-value reftex-docstruct-symbol)))
                 (if (< 1 (length x1))
                     (append (list (car x))
                             (mapcar (function
                                      (lambda(x)
                                        (abbreviate-file-name (nth 3 x))))
                                     x1))
                   (list nil)))))))
          (reftex-uniquify-by-car (symbol-value reftex-docstruct-symbol)))))

    (setq dlist (reftex-uniquify-by-car dlist))
    (if (null dlist) (error "No duplicate labels in document"))
    (switch-to-buffer-other-window "*Duplicate Labels*")
    (make-local-variable 'TeX-master)
    (setq TeX-master master)
    (erase-buffer)
    (insert "                MULTIPLE LABELS IN CURRENT DOCUMENT:\n")
    (insert 
     " Move point to label and type `r' to run a query-replace on the label\n"
     " and its references.  Type `q' to exit this buffer.\n\n")
    (insert " LABEL               FILE\n")
    (insert " -------------------------------------------------------------\n")
    (use-local-map (make-sparse-keymap))
    (local-set-key [?q] (function
                         (lambda () "Kill this buffer." (interactive)
                           (kill-buffer (current-buffer)) (delete-window))))
    (local-set-key [?r] 'reftex-change-label)
    (while dlist
      (when (and (car (car dlist))
                 (cdr (car dlist)))
        (incf cnt)
        (insert (mapconcat 'identity (car dlist) "\n    ") "\n"))
      (pop dlist))
    (goto-char (point-min))
    (when (= cnt 0)
      (kill-buffer (current-buffer))
      (delete-window)
      (message "Document does not contain duplicate labels."))))

(defun reftex-change-label (&optional from to)
  "Query replace FROM with TO in all \\label and \\ref commands.
Works on the entire multifile document.
If you exit (\\[keyboard-quit] or ESC), you can resume the query replace
with the command \\[tags-loop-continue].
No active TAGS table is required."
  (interactive)
  (let ((default (reftex-this-word "-a-zA-Z0-9_*.:")))
    (unless from
      (setq from (read-string (format "Replace label globally [%s]: "
                                      default))))
    (if (string= from "") (setq from default))
    (unless to
      (setq to (read-string (format "Replace label %s with: "
                                    from))))
    (reftex-query-replace-document
     (concat "\\\\\\(label\\|[a-z]*ref\\){" (regexp-quote from) "}")
     (format "\\\\\\1{%s}" to))))

(defun reftex-renumber-simple-labels ()
  "Renumber all simple labels in the document to make them sequentially.
Simple labels are the ones created by RefTeX, consisting only of the
prefix and a number.  After the command completes, all these labels will
have sequential numbers throughout the document.  Any references to
the labels will be changed as well.  For this, RefTeX looks at the
arguments of any macros which either start or end in the string `ref'.
This command should be used with care, in particular in multifile
documents.  You should not use it if another document refers to this
one with the `xr' package."
  (interactive)
  ;; Resan the entire document
  (reftex-access-scan-info 1)
  ;; Get some insurance
  (if (and (reftex-is-multi)
           (not (yes-or-no-p "Replacing all simple labels in multiple files is risky.  Continue? ")))
      (error "Abort"))
  ;; Make the translation list
  (let* ((re-core (concat "\\(" 
                          (mapconcat 'cdr reftex-typekey-to-prefix-alist "\\|") 
                          "\\)"))
         (label-re (concat "\\`" re-core "\\([0-9]+\\)\\'"))
         (search-re (concat "{\\(" re-core "\\([0-9]+\\)\\)}"))
         (error-fmt "Undefined label or reference %s. Ignore and continue? ")
         (label-numbers-alist (mapcar (lambda (x) (cons (cdr x) 0))
                                      reftex-typekey-to-prefix-alist))
         (files (reftex-all-document-files))
         (list (symbol-value reftex-docstruct-symbol))
         translate-alist n entry label new-label nr-cell changed-sequence)

    (while (setq entry (pop list))
      (when (and (stringp (car entry))
                 (string-match label-re (car entry)))
        (setq label (car entry)
              nr-cell (assoc (match-string 1 (car entry))
                             label-numbers-alist))
        (if (assoc label translate-alist)
            (error "Duplicate label %s" label))
        (setq new-label (concat (match-string 1 (car entry))
                                (incf (cdr nr-cell))))
        (push (cons label new-label) translate-alist)
        (or (string= label new-label) (setq changed-sequence t))))

    (unless changed-sequence
      (error "Simple labels are already in correct sequence"))

    ;; Save all document buffers before this operation
    (reftex-save-all-document-buffers)

    ;; First test to check for erros
    (setq n (reftex-translate 
             files search-re translate-alist error-fmt 'test))

    ;; Now the real thing.
    (if (yes-or-no-p 
         (format "Replace %d items at %d places in %d files? "
                 (length translate-alist) n (length files)))
        (progn
          (let ((inhibit-quit t))  ;; Do not disturb...
            (reftex-translate
             files search-re translate-alist error-fmt nil)
            (setq quit-flag nil))
          (if (and (reftex-is-multi)
                   (yes-or-no-p "Save entire document? "))
              (reftex-save-all-document-buffers))
          ;; Rescan again...
          (reftex-access-scan-info 1)
          (message "Done replacing simple labels."))
      (message "No replacements done"))))

(defun reftex-translate (files search-re translate-alist error-fmt test)
  ;; In FILES, look for SEARCH-RE and replace match 1 of it with
  ;; its association in TRANSLATE-ALSIT.  
  ;; If we do not find an association and TEST is non-nil, query
  ;; to ignore the problematic string.  
  ;; If TEST is nil, it is ignored without query.
  ;; Return the number of replacements.
  (let ((n 0) file label match-data buf macro pos cell)
    (while (setq file (pop files))
      (setq buf (reftex-get-file-buffer-force file))
      (unless buf
        (error "No such file %s" file))
      (set-buffer buf)
      (save-excursion
        (save-restriction
          (widen)
          (goto-char (point-min))
          (while (re-search-forward search-re nil t)
            (save-excursion
              (backward-char)
              (setq label (reftex-match-string 1)
                    cell (assoc label translate-alist)
                    match-data (match-data)
                    macro (reftex-what-macro 1)
                    pos (cdr macro))
              (goto-char (or pos (point)))
              (when (and macro
                         (or (looking-at "\\\\ref")
                             (looking-at "\\\\[a-zA-Z]*ref[^a-zA-Z]")
                             (looking-at "\\\\ref[a-zA-Z]*[^a-zA-Z]")
                             (looking-at (format 
                                          reftex-find-label-regexp-format
                                          (regexp-quote label)))))
                ;; OK, we should replace it.
                (set-match-data match-data)
                (cond
                 ((and test (not cell))
                  ;; We've got a problem
                  (unwind-protect
                      (progn
                        (reftex-highlight 1 (match-beginning 0) (match-end 0))
                        (ding)
                        (or (y-or-n-p (format error-fmt label))
                            (error "Abort")))
                    (reftex-unhighlight 1)))
                 ((and test cell)
                  (incf n))
                 ((and (not test) cell)
                  ;; Replace
                  (goto-char (match-beginning 1))
                  (delete-region (match-beginning 1) (match-end 1))
                  (insert (cdr cell)))
                 (t nil))))))))
    n))

(defun reftex-save-all-document-buffers ()
  "Save all documents associated with the current document.
The function is useful after a global action like replacing or renumbering
labels."
  (interactive)
  (let ((files (reftex-all-document-files))
        file buffer)
    (save-excursion
      (while (setq file (pop files))
        (setq buffer (reftex-get-buffer-visiting file))
        (when buffer
          (set-buffer buffer)
          (save-buffer))))))

;;; =========================================================================
;;;
;;; AUCTeX Interface

(defun reftex-plug-flag (which)
  ;; Tell if a certain flag is set in reftex-plug-into-AUCTeX
  (or (eq t reftex-plug-into-AUCTeX)
      (and (listp reftex-plug-into-AUCTeX)
           (nth which reftex-plug-into-AUCTeX))))

(defun reftex-arg-label (optional &optional prompt definition)
  "Use `reftex-label', `reftex-reference' or AUCTeX's code to insert label arg.
What is being used depends upon `reftex-plug-into-AUCTeX'."
  (let (label)
    (cond
     ((and definition (reftex-plug-flag 1))
      ;; Create a new label, with a temporary brace for `reftex-what-macro'
      (unwind-protect
          (progn (insert "{") (setq label (or (reftex-label nil t) "")))
        (delete-backward-char 1)))
     ((and (not definition) (reftex-plug-flag 2))
      ;; Reference a label with RefTeX
      (setq label (reftex-reference nil t)))
     (t
      ;; AUCTeX's default mechanism
      (setq label (completing-read (TeX-argument-prompt optional prompt "Key")
                                   (LaTeX-label-list)))))
    (if (and definition (not (string-equal "" label)))
        (LaTeX-add-labels label))
    (TeX-argument-insert label optional optional)))

(defun reftex-arg-cite (optional &optional prompt definition)
  "Use `reftex-citation' or AUCTeX's code to insert a cite-key macro argument.
What is being used depends upon `reftex-plug-into-AUCTeX'."
  (let (items)
    (cond
     ((and (not definition) (reftex-plug-flag 3))
      (setq items (list (or (reftex-citation t) ""))))
     (t
      (setq prompt (concat (if optional "(Optional) " "")
                           (if prompt prompt "Add key")
                           ": (default none) "))
      (setq items (multi-prompt "," t prompt (LaTeX-bibitem-list)))))
    (apply 'LaTeX-add-bibitems items)
    (TeX-argument-insert (mapconcat 'identity items ",") optional optional)))

(defun reftex-plug-into-AUCTeX ()
  ;; Replace AUCTeX functions with RefTeX functions.
  ;; Which functions are replaced is controlled by the variable
  ;; `reftex-plug-into-AUCTeX'.
  
  (if (reftex-plug-flag 0)
      (setq LaTeX-label-function 'reftex-label)
    (setq LaTeX-label-function nil))

  (if (and (or (reftex-plug-flag 1) (reftex-plug-flag 2))
           (fboundp 'TeX-arg-label))
      (fset 'TeX-arg-label 'reftex-arg-label))

  (if (and (reftex-plug-flag 3)
           (fboundp 'TeX-arg-cite))
      (fset 'TeX-arg-cite 'reftex-arg-cite)))

(defun reftex-toggle-plug-into-AUCTeX ()
  "Toggle Interface between AUCTeX and RefTeX on and off."
  (interactive)
  (unless (and (featurep 'tex-site) (featurep 'latex))
    (error "AUCTeX's LaTeX mode does not seem to be loaded."))
  (setq reftex-plug-into-AUCTeX (not reftex-plug-into-AUCTeX))
  (reftex-plug-into-AUCTeX)
  (if reftex-plug-into-AUCTeX
      (message "RefTeX has been plugged into AUCTeX.")
    (message "RefTeX no longer interacts with AUCTeX.")))

(defun reftex-add-label-environments (entry-list)
  "Add label environment descriptions to `reftex-label-alist-style'.
The format of ENTRY-LIST is exactly like `reftex-label-alist'.  See there
for details.
This function makes it possible to support RefTeX from AUCTeX style files.
The entries in ENTRY-LIST will be processed after the user settings in
`reftex-label-alist', and before the defaults (specified in
`reftex-default-label-alist-entries').  Any changes made to
`reftex-label-alist-style' will raise a flag to the effect that
the label information is recompiled on next use."
  (unless reftex-docstruct-symbol
    (reftex-tie-multifile-symbols))
  (when (and reftex-docstruct-symbol
             (symbolp reftex-docstruct-symbol))
    (let ((list (get reftex-docstruct-symbol 'reftex-label-alist-style))
          entry changed)
      (while entry-list
        (setq entry (pop entry-list))
        (unless (member entry list)
          (setq reftex-tables-dirty t
                changed t)
          (push entry list)))
      (when changed
        (put reftex-docstruct-symbol 'reftex-label-alist-style list)))))
(defalias 'reftex-add-to-label-alist 'reftex-add-label-environments)

(defun reftex-add-section-levels (entry-list)
  "Add entries to the value of `reftex-section-levels'.
The added values are kept local to the current document.  The format
of ENTRY-LIST is a list of cons cells (\"MACRONAME\" . LEVEL).  See
`reftex-section-levels' for an example."
  (unless reftex-docstruct-symbol
    (reftex-tie-multifile-symbols))
  (when (and reftex-docstruct-symbol
             (symbolp reftex-docstruct-symbol))
    (let ((list (get reftex-docstruct-symbol 'reftex-section-levels))
          entry changed)
      (while entry-list
        (setq entry (pop entry-list))
        (unless (member entry list)
          (setq reftex-tables-dirty t
                changed t)
          (push entry list)))
      (when changed
        (put reftex-docstruct-symbol 'reftex-section-levels list)))))

(defun reftex-set-cite-format (value)
  "Set the document-local value of `reftex-cite-format'.
When such a value exists, it overwrites the setting given with
`reftex-cite-format'.  See the documentation of `reftex-cite-format'
for possible values.  This function should be used from AUCTeX style files."
  (unless reftex-docstruct-symbol
    (reftex-tie-multifile-symbols))
  (when (and reftex-docstruct-symbol
             (symbolp reftex-docstruct-symbol))
    (put reftex-docstruct-symbol 'reftex-cite-format value)))

(defun reftex-notice-new-section ()
  "Hook to handshake with RefTeX after a new section has been inserted."
  ;; Add a new section to the docstruct list and renumber the
  ;; following sections.  This hook has to be called immediately after
  ;; the new section was inserted into the buffer, and before the
  ;; section label is created.

  (condition-case nil
      (catch 'exit
        (unless reftex-mode (throw 'exit nil))
        (reftex-access-scan-info)
        (let* ((docstruct (symbol-value reftex-docstruct-symbol))
               here-am-I appendix tail toc-entry star level
               section-number context)

     (save-excursion
       (when (re-search-backward reftex-section-regexp nil t)

         ;; Find where we are
         (setq here-am-I (reftex-where-am-I))
         (unless (cdr here-am-I) (throw 'exit nil))
         (setq reftex-active-toc (reftex-last-assoc-before-elt
                                  'toc (car here-am-I) docstruct)
               appendix (reftex-last-assoc-before-elt
                         'appendix (car here-am-I) docstruct))

         ;; Initialize section numbers
         (if (eq (car (car here-am-I)) 'appendix)
             (reftex-init-section-numbers nil t)
           (reftex-init-section-numbers reftex-active-toc appendix))

         ;; Match the section command
         (when (and (re-search-forward reftex-everything-regexp nil t)
                    (match-end 3))
           (setq star (= ?* (char-after (match-end 3)))
                 toc-entry (reftex-section-info (buffer-file-name))
                 level (nth 5 toc-entry)
                 tail (memq (car here-am-I) 
                            (symbol-value reftex-docstruct-symbol)))
           (if tail
               ;; Insert the section info
               (push toc-entry (cdr tail))
             (throw 'exit nil))

           ;; We are done unless we use section numbers
           (unless (nth 1 reftex-label-menu-flags) (throw 'exit nil))

           ;; Update the remaining toc items
           (setq tail (cdr tail))
           (while (and (setq tail (memq (assq 'toc (cdr tail)) tail))
                       (setq toc-entry (car tail))
                       (>= (nth 5 toc-entry) level))
             (setq section-number
                   (reftex-section-number (nth 5 toc-entry) star)
                   context (nth 2 toc-entry))
             (when (string-match "\\`\\([ \t]*\\)\\([.0-9A-Z]+\\)\\(.*\\)"
                                 context)
               (when (and (not appendix)
                          (>= (string-to-char (match-string 2)) ?A))
                 ;; Just entered the appendex.  Get out.
                 (throw 'exit nil))

               ;; Change the section number.
               (setf (nth 2 toc-entry)
                     (concat (match-string 1 context)
                             section-number
                             (match-string 3 context))))))))))
    (error nil))
  )

;;; =========================================================================
;;;
;;; Keybindings 

;; The default bindings in the mode map.
(loop for x in
      '(("\C-c=" . reftex-toc)
        ("\C-c(" . reftex-label)
        ("\C-c)" . reftex-reference)
        ("\C-c[" . reftex-citation)
        ("\C-c&" . reftex-view-crossref))
      do (define-key reftex-mode-map (car x) (cdr x)))

;; Bind `reftex-mouse-view-crossref' only when the key is still free
(if (featurep 'xemacs)
    (unless (key-binding [(shift button2)])
      (define-key reftex-mode-map [(shift button2)] 
        'reftex-mouse-view-crossref))
  (unless (key-binding [(shift mouse-2)])
    (define-key reftex-mode-map [(shift mouse-2)] 
      'reftex-mouse-view-crossref)))

;; If the user requests so, she can have a few more bindings:
(when reftex-extra-bindings
  (loop for x in
        '(("\C-ct" . reftex-toc)
          ("\C-cl" . reftex-label)
          ("\C-cr" . reftex-reference)
          ("\C-cc" . reftex-citation)
          ("\C-cv" . reftex-view-crossref)
          ("\C-cg" . reftex-grep-document)
          ("\C-cs" . reftex-search-document))
        do (define-key reftex-mode-map (car x) (cdr x))))

;; Common bindings in reftex-select-label-map and reftex-select-bib-map
(let ((map (make-sparse-keymap)))
  (substitute-key-definition
   'next-line 'reftex-select-next                      map global-map)
  (substitute-key-definition
   'previous-line 'reftex-select-previous              map global-map)
  (substitute-key-definition
   'keyboard-quit 'reftex-select-keyboard-quit         map global-map)
  (substitute-key-definition
   'newline 'reftex-select-accept                      map global-map)

  (loop for x in
        '((" "        . reftex-select-callback)
          ("n"        . reftex-select-next)
          ([(down)]   . reftex-select-next)
          ("p"        . reftex-select-previous)
          ([(up)]     . reftex-select-previous)
          ("f"        . reftex-select-toggle-follow)
          ("\C-m"     . reftex-select-accept)
          ([(return)] . reftex-select-accept) 
          ("q"        . reftex-select-quit)
          ("."        . reftex-select-show-insertion-point)
          ("?"        . reftex-select-help))
        do (define-key map (car x) (cdr x)))

  ;; The mouse-2 binding
  (if (featurep 'xemacs)
      (define-key map [(button2)] 'reftex-select-mouse-accept)
    (define-key map [(mouse-2)] 'reftex-select-mouse-accept))

  ;; Digit arguments
  (loop for key across "0123456789" do
        (define-key map (vector (list key)) 'digit-argument))
  (define-key map "-" 'negative-argument)

  ;; Make two maps
  (setq reftex-select-label-map map)
  (setq reftex-select-bib-map (copy-keymap map)))

;; Specific bindings in reftex-select-label-map
(loop for key across "cgilrRstx#%" do
      (define-key reftex-select-label-map (vector (list key))
        (list 'lambda '() 
              "Press `?' during selection to find out about this key."
              '(interactive) (list 'throw '(quote myexit) key))))

(loop for x in
      '(("b"        . reftex-select-jump-to-previous)
        ("v"        . reftex-select-toggle-varioref)
        ([(tab)]    . reftex-select-read-label)
        ("\C-i"     . reftex-select-read-label)
        ("\C-c\C-n" . reftex-select-next-heading)
        ("\C-c\C-p" . reftex-select-previous-heading))
      do
      (define-key reftex-select-label-map (car x) (cdr x)))

;; Specific bindings in reftex-select-bib-map
(loop for key across "grRaA" do
      (define-key reftex-select-bib-map (vector (list key))
        (list 'lambda '() 
              "Press `?' during selection to find out about this key."
              '(interactive) (list 'throw '(quote myexit) key))))

(loop for x in
      '(("\C-i"  . reftex-select-read-cite)
        ([(tab)] . reftex-select-read-cite))
      do (define-key reftex-select-bib-map (car x) (cdr x)))
  
;; Table of Contents map
(if (featurep 'xemacs)
    (define-key reftex-toc-map [(button2)] 'reftex-toc-mouse-goto-line-and-hide)
  (define-key reftex-toc-map  [(mouse-2)] 'reftex-toc-mouse-goto-line-and-hide))

(loop for x in
      '(("n"    . next-line)
        ("p"    . previous-line)
        ("?"    . reftex-toc-show-help)
        (" "    . reftex-toc-view-line)
        ("\C-m" . reftex-toc-goto-line-and-hide)
        ("\C-i" . reftex-toc-goto-line)
        ("r"    . reftex-toc-rescan)
        ("R"    . reftex-toc-Rescan)
        ("g"    . revert-buffer)
        ("q"    . reftex-toc-quit)
        ("Q"    . reftex-toc-quit-and-kill)
        ("f"    . reftex-toc-toggle-follow)
        ("x"    . reftex-toc-external)
        ("."    . reftex-toc-show-insertion-point))
      do (define-key reftex-toc-map (car x) (cdr x)))

(loop for key across "0123456789" do
      (define-key reftex-toc-map (vector (list key)) 'digit-argument))
(define-key reftex-toc-map "-" 'negative-argument)
 
;;; =========================================================================
;;;
;;; Menu

;; Define a menu for the menu bar if Emacs is running under X

(require 'easymenu)

(easy-menu-define
 reftex-mode-menu reftex-mode-map
 "Menu used in RefTeX mode"
 `("Ref"
   ["Table of Contents"       reftex-toc t]
   "---"
   ["\\label"                 reftex-label t]
   ["\\ref"                   reftex-reference t]
   ["\\cite"                  reftex-citation t]
   ["View Crossref"           reftex-view-crossref t]
   "---"
   ("Parse Document"
    ["Only this File"         reftex-parse-one t]
    ["Entire Document"        reftex-parse-all (reftex-is-multi)]
    ["Save to File"           (reftex-access-parse-file 'write)
     (> (length (symbol-value reftex-docstruct-symbol)) 0)]
    ["Restore from File"      (reftex-access-parse-file 'restore) t]
    "---"
    ["Reset RefTeX Mode"       reftex-reset-mode t])
   ("Global Actions"
    ["Search Whole Document"  reftex-search-document t]
    ["Replace in Document"    reftex-query-replace-document t]
    ["Grep on Document"       reftex-grep-document t]
    "---"
    ["Create TAGS File"       reftex-create-tags-file t]
    "---"
    ["Find Duplicate Labels"  reftex-find-duplicate-labels t]
    ["Change Label and Refs"  reftex-change-label t]
    ["Renumber Simple Labels" reftex-renumber-simple-labels t]
    "---"
    ["Save document"          reftex-save-all-document-buffers t])
   "---"
   ("Options"
    ("Table of Contents"
     ["Follow Mode" (setq reftex-toc-follow-mode (not reftex-toc-follow-mode))
      :style toggle :selected reftex-toc-follow-mode]
     ["Follow Mode may visit files"
      (setq reftex-revisit-to-follow (not reftex-revisit-to-follow))
      :style toggle :selected reftex-revisit-to-follow])
    ("References"
     ["Guess Label Type" 
      (setq reftex-guess-label-type (not reftex-guess-label-type))
      :style toggle :selected reftex-guess-label-type]
     ["Use `\\vref' by Default" 
      (setq reftex-vref-is-default (not reftex-vref-is-default))
      :style toggle :selected reftex-vref-is-default]
     "---"
     "Selection Buffers"
     ["Use Multiple Buffers"
      (setq reftex-use-multiple-selection-buffers
            (not reftex-use-multiple-selection-buffers))
      :style toggle :selected reftex-use-multiple-selection-buffers]
     ["Auto Update Buffers"
      (setq reftex-auto-update-selection-buffers
            (not reftex-auto-update-selection-buffers))
      :style toggle :selected reftex-auto-update-selection-buffers])
    ("Citations"
     "Citation Style"
     ,@(mapcar
        (function
         (lambda (x)
           (vector
            (capitalize (symbol-name (car x)))
            (list 'reftex-set-cite-format (list 'quote (car x)))
            ':style 'radio ':selected
            (list 'eq (list 'reftex-get-cite-format) (list 'quote (car x))))))
        reftex-cite-format-builtin)
     "---"
     "Bibinfo in Comments"
     ["Attach Comments"
      (setq reftex-comment-citations (not reftex-comment-citations))
      :style toggle :selected reftex-comment-citations]
     "---"
     "Sort Database Matches"
     ["by Author" (setq reftex-sort-bibtex-matches 'author)
      :style radio :selected (eq reftex-sort-bibtex-matches 'author)]
     ["by Year" (setq reftex-sort-bibtex-matches 'year)
      :style radio :selected (eq reftex-sort-bibtex-matches 'year)]
     ["by Year, reversed" (setq reftex-sort-bibtex-matches 'reverse-year)
      :style radio :selected (eq reftex-sort-bibtex-matches 'reverse-year)]
     ["Not" (setq reftex-sort-bibtex-matches nil)
      :style radio :selected (eq reftex-sort-bibtex-matches nil)])
    ("Crossref Viewing"
     ["Automatic Info" reftex-toggle-auto-view-crossref
      :style toggle :selected reftex-auto-view-crossref-timer]
     ["...in Echo Area" (setq reftex-auto-view-crossref t)
      :style radio :selected (eq reftex-auto-view-crossref t)]
     ["...in Other Window" (setq reftex-auto-view-crossref 'window)
      :style radio :selected (eq reftex-auto-view-crossref 'window)]
     "---"
     ["Crossref Echo may visit files"
      (setq reftex-revisit-to-echo (not reftex-revisit-to-echo))
      :style toggle :selected reftex-revisit-to-echo]
     ["Cache Echo strings for \cite"
      (setq reftex-cache-cite-echo (not reftex-cache-cite-echo))
      :style toggle :selected reftex-cache-cite-echo])
    ("Parser"
     "Document Scans"
     ["Partial Scans"
      (setq reftex-enable-partial-scans (not reftex-enable-partial-scans))
      :style toggle :selected reftex-enable-partial-scans]
     ["Auto-Save Parse Info"
      (setq reftex-save-parse-info (not reftex-save-parse-info))
      :style toggle :selected reftex-save-parse-info]
     ["Automatic Rescans"
      (setq reftex-allow-automatic-rescan (not reftex-allow-automatic-rescan))
      :style toggle :selected reftex-allow-automatic-rescan]
     "---"
     "Temporary Buffers"
     ["Keep Buffers"
      (setq reftex-keep-temporary-buffers (not reftex-keep-temporary-buffers))
      :style toggle :selected reftex-keep-temporary-buffers]
     ["Initialize when Visiting"
      (setq reftex-initialize-temporary-buffers
            (not reftex-initialize-temporary-buffers))
      :style toggle :selected reftex-initialize-temporary-buffers])
    ("AUC TeX"
     ["Plug into AUC TeX" reftex-toggle-plug-into-AUCTeX
      :style toggle :selected reftex-plug-into-AUCTeX])
    ("Fontification"
     ["Use Fontification" (setq reftex-use-fonts (not reftex-use-fonts))
      :style toggle :selected reftex-use-fonts]
     ["Fontify Context Display" (setq reftex-refontify-context 
                                      (not (reftex-refontify)))
      :style toggle :selected (reftex-refontify)]))
   ;;"---"
   ("Customize"
    ["Browse RefTeX group" reftex-customize t]
    "---"
    ["Build Full Customize Menu" reftex-create-customize-menu 
     (fboundp 'customize-menu-create)])
   "---"
   ("Documentation"
    ["Info" reftex-info t]
    ["Commentary" reftex-show-commentary t])))

(defun reftex-customize ()
  "Call the customize function with reftex as argument."
  (interactive)
  (customize-browse 'reftex))

(defun reftex-create-customize-menu ()
  "Create a full customization menu for RefTeX, insert it into the menu."
  (interactive)
  (if (fboundp 'customize-menu-create)
      (progn
        (easy-menu-change 
         '("Ref") "Customize"
         `(["Browse RefTeX group" reftex-customize t]
           "---"
           ,(customize-menu-create 'reftex)
           ["Set" Custom-set t]
           ["Save" Custom-save t]
           ["Reset to Current" Custom-reset-current t]
           ["Reset to Saved" Custom-reset-saved t]
           ["Reset to Standard Settings" Custom-reset-standard t]))
        (message "\"Ref\"-menu now contains full customization menu"))
    (error "Cannot expand menu (outdated version of cus-edit.el)")))

(defun reftex-show-commentary ()
  "Use the finder to view the file documentation from `reftex.el'."
  (interactive)
  (require 'finder)
  (finder-commentary "reftex.el"))

(defun reftex-info ()
  "Read documentation for RefTeX in the info system."
  (interactive)
  (require 'info)
  (Info-goto-node "(reftex)"))

;; Support for \label and \ref --------------------------------------

;;; Install the kill-buffer and kill-emacs hooks ------------------------------

(add-hook 'kill-buffer-hook 'reftex-kill-buffer-hook)
(add-hook 'kill-emacs-hook  'reftex-kill-emacs-hook)

;;; Install the idle timer if requested ---------------------------------------

(and reftex-auto-view-crossref
     (not reftex-auto-view-crossref-timer)
     (reftex-toggle-auto-view-crossref))

;;; Run Hook ------------------------------------------------------------------

(run-hooks 'reftex-load-hook)

;;; That's it! ----------------------------------------------------------------

(setq reftex-tables-dirty t)  ; in case this file is evaluated by hand
(provide 'reftex) 

;;;============================================================================

;;; reftex.el ends here