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+;; tcl.el -- Tcl code editing commands for Emacs
+
+;; Copyright (C) 1994 Free Software Foundation, Inc.
+
+;;; Maintainer: Tom Tromey <tromey@busco.lanl.gov>
+;;; Author: Tom Tromey <tromey@busco.lanl.gov>
+;;;    Chris Lindblad <cjl@lcs.mit.edu>
+;;; Keywords: languages
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 1, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;; HOW TO INSTALL:
+;; Put the following forms in your .emacs to enable autoloading of Tcl
+;; mode, and auto-recognition of ".tcl" files.
+;;
+;;   (autoload 'tcl-mode "tcl" "Tcl mode." t)
+;;   (autoload 'inferior-tcl "tcl" "Run inferior Tcl process." t)
+;;   (setq auto-mode-alist (append '(("\\.tcl$" . tcl-mode)) auto-mode-alist))
+;;
+;; If you plan to use the interface to the TclX help files, you must
+;; set the variable tcl-help-directory to point to the topmost
+;; directory containing the TclX help files.  Eg:
+;;
+;;   (setq tcl-help-directory "/usr/local/lib/tclx/help")
+;;
+;; Also you will want to add the following to your .emacs:
+;;
+;;   (autoload 'tcl-help-on-word "tcl" "Help on Tcl commands" t)
+;;
+;; FYI a *very* useful thing to do is nroff all the Tk man pages and
+;; put them in a subdir of the help system.
+;;
+
+;;; Commentary:
+
+;; LCD Archive Entry:
+;; tcl|Tom Tromey|tromey@busco.lanl.gov|
+;; Major mode for editing Tcl|
+;; 6-Apr-94|1.0|
+
+;; CUSTOMIZATION NOTES:
+;; * tcl-proc-list can be used to customize a list of things that
+;; "define" other things.  Eg in my project I put "defvar" in this
+;; list.
+;; * tcl-typeword-list is similar, but uses font-lock-type-face.
+;; * tcl-keyword-list is a list of keywords.  I've generally used this
+;; for flow-control words.  Eg I add "unwind_protect" to this list.
+;; * tcl-type-alist can be used to minimally customize indentation
+;; according to context.
+
+;; Change log:
+;; 18-Mar-1994		Tom Tromey	Fourth beta release.
+;;    Added {un,}comment-region to menu.  Idea from
+;;    Mike Scheidler <c23mts@kocrsv01.delcoelect.com>
+;; 17-Mar-1994		Tom Tromey	
+;;    Fixed tcl-restart-with-file.  Bug fix attempt in
+;;    tcl-internal-end-of-defun.
+;; 16-Mar-1994		Tom Tromey	Third beta release
+;;    Added support code for menu (from Tcl mode written by
+;;    schmid@fb3-s7.math.TU-Berlin.DE (Gregor Schmid)).
+;; 12-Mar-1994		Tom Tromey	
+;;    Better documentation for inferior-tcl-buffer.  Wrote
+;;    tcl-restart-with-file.  Wrote Lucid Emacs menu (but no
+;;    code to install it).
+;; 12-Mar-1994		Tom Tromey	
+;;    Wrote tcl-guess-application.  Another stab at making
+;;    tcl-omit-ws-regexp work.
+;; 10-Mar-1994		Tom Tromey	Second beta release
+;;    Last Modified: Thu Mar 10 01:24:25 1994 (Tom Tromey)
+;;    Wrote perl-mode style line indentation command.
+;;    Wrote more documentation.  Added tcl-continued-indent-level.
+;;    Integrated help code.
+;; 8-Mar-1994		Tom Tromey	
+;;    Last Modified: Tue Mar  8 11:58:44 1994 (Tom Tromey)
+;;    Bug fixes.
+;; 6-Mar-1994		Tom Tromey	
+;;    Last Modified: Sun Mar  6 18:55:41 1994 (Tom Tromey)
+;;    Updated auto-newline support.
+;; 6-Mar-1994		Tom Tromey	Beta release
+;;    Last Modified: Sat Mar  5 17:24:32 1994 (Tom Tromey)
+;;    Wrote tcl-hashify-buffer.  Other minor bug fixes.
+;; 5-Mar-1994		Tom Tromey	
+;;    Last Modified: Sat Mar  5 16:11:20 1994 (Tom Tromey)
+;;    Wrote electric-hash code.
+;; 3-Mar-1994		Tom Tromey	
+;;    Last Modified: Thu Mar  3 02:53:40 1994 (Tom Tromey)
+;;    Added code to handle auto-fill in comments.
+;;    Added imenu support code.
+;;    Cleaned up code.
+;;    Better font-lock support.
+;; 28-Feb-1994		Tom Tromey	
+;;    Last Modified: Mon Feb 28 14:08:05 1994 (Tom Tromey)
+;;    Made tcl-figure-type more easily configurable.
+;; 28-Feb-1994		Tom Tromey	
+;;    Last Modified: Mon Feb 28 01:02:58 1994 (Tom Tromey)
+;;    Wrote inferior-tcl mode.
+;; 16-Feb-1994		Tom Tromey	
+;;    Last Modified: Wed Feb 16 17:05:19 1994 (Tom Tromey)
+;;    Added support for font-lock-mode.
+;; 29-Oct-1993		Tom Tromey	
+;;    Last Modified: Sun Oct 24 17:39:14 1993 (Tom Tromey)
+;;    Patches from Guido Bosch to make things work with Lucid Emacs.
+;; 22-Oct-1993		Tom Tromey	
+;;    Last Modified: Fri Oct 22 15:26:46 1993 (Tom Tromey)
+;;    Made many characters have "_" syntax class; suggested by Guido
+;;    Bosch <Guido.Bosch@loria.fr>.  Note that this includes the "$"
+;;    character, which might be a change you'd notice.
+;; 21-Oct-1993		Tom Tromey	
+;;    Last Modified: Thu Oct 21 20:28:40 1993 (Tom Tromey)
+;;    More fixes for tcl-omit-ws-regexp.
+;; 20-Oct-1993		Tom Tromey	
+;;    Started keeping history.  Fixed tcl-{beginning,end}-of-defun.
+;;    Added some code to make things work with Emacs 18.
+
+;; THANKS TO:
+;; Guido Bosch <Guido.Bosch@loria.fr>
+;; pgs1002@esc.cam.ac.uk (Dr P.G. Sjoerdsma)
+;; Mike Scheidler <c23mts@kocrsv01.delcoelect.com>
+;; Matt Newman <men@charney.colorado.edu>
+;; rwhitby@research.canon.oz.au (Rod Whitby)
+;; h9118101@hkuxa.hku.hk (Yip Chi Lap [Beta])
+;; Pertti Tapio Kasanen <ptk@delta.hut.fi>
+;; schmid@fb3-s7.math.TU-Berlin.DE (Gregor Schmid)
+
+;; KNOWN BUGS:
+;; * indent-region should skip blank lines.  (It does in v19, so I'm
+;;   not motivated to fix it here).
+;; * In Tcl "#" is not always a comment character.  This can confuse
+;;   tcl.el in certain circumstances.  For now the only workaround is
+;;   to enclose offending hash characters in quotes or precede it with
+;;   a backslash.  Note that using braces won't work -- quotes change
+;;   the syntax class of characters between them, while braces do not.
+;;   The electric-# mode helps alleviate this problem somewhat.
+;; * indent-tcl-exp is untested.
+;; * Doesn't work under Emacs 18 yet.
+;; * There's been a report that font-lock does strange things under
+;;   Lucid Emacs 19.6.  For instance in "proc foobar", the space
+;;   before "foobar" is highlighted.
+
+;; TODO:
+;; * make add-log-tcl-defun smarter.  should notice if we are in the
+;;   middle of a defun, or between defuns.  should notice if point is
+;;   on first line of defun (or maybe even in comments before defun).
+;; * Allow continuation lines to be indented under the first argument
+;;   of the preceeding line, like this:
+;;      [list something \
+;;            something-else]
+;; * There is a request that indentation work like this:
+;;        button .fred -label Fred \
+;;                     -command {puts fred}
+;; * Should have tcl-complete-symbol that queries the inferior process.
+;; * Should have describe-symbol that works by sending the magic
+;;   command to a tclX process.
+;; * Need C-x C-e binding (tcl-eval-last-exp).
+;; * Write indent-region function that is faster than indenting each
+;;   line individually.
+;; * tcl-figure-type should stop at "beginning of line" (only ws
+;;   before point, and no "\" on previous line).  (see tcl-real-command-p).
+;; * Fix beginning-of-defun.  I believe this will be fully possible in
+;;   FSF Emacs 19.23
+;; * overrides some comint keybindings; fix.
+;; * Trailing \ will eat blank lines.  Should deal with this.
+;;   (this would help catch some potential bugs).
+;; * Inferior should display in half the screen, not the whole screen.
+
+
+
+;;; Code:
+
+(require 'comint)
+
+;;
+;; User variables.
+;;
+
+(defvar tcl-indent-level 4
+  "*Indentation of Tcl statements with respect to containing block.")
+
+(defvar tcl-continued-indent-level 4
+  "*Indentation of continuation line relative to first line of command.")
+
+(defvar tcl-auto-newline nil
+  "*Non-nil means automatically newline before and after braces
+inserted in Tcl code.")
+
+(defvar tcl-tab-always-indent t
+  "*Control effect of TAB key.
+If t (the default), always indent current line.
+If nil and point is not in the indentation area at the beginning of
+the line, a TAB is inserted.
+Other values cause the first possible action from the following list
+to take place:
+
+  1. Move from beginning of line to correct indentation.
+  2. Delete an empty comment.
+  3. Move forward to start of comment, indenting if necessary.
+  4. Move forward to end of line, indenting if necessary.
+  5. Create an empty comment.
+  6. Move backward to start of comment, indenting if necessary.")
+
+(defvar tcl-use-hairy-comment-detector t
+  "*If not `nil', the the more complicated, but slower, comment
+detecting function is used.  This variable is only used in GNU Emacs
+19 (the fast function is always used elsewhere).")
+
+(defvar tcl-electric-hash-style 'smart
+  "*Style of electric hash insertion to use.
+Possible values are 'backslash, meaning that `\\' quoting should be
+done; `quote, meaning that `\"' quoting should be done; 'smart,
+meaning that the choice between 'backslash and 'quote should be
+made depending on the number of hashes inserted; or nil, meaning that
+no quoting should be done.  Any other value for this variable is
+taken to mean 'smart.  The default is 'smart.")
+
+(defvar tcl-help-directory nil
+  "*Name of topmost directory containing TclX help files")
+
+(defvar tcl-use-smart-word-finder t
+  "*If not nil, use a better way of finding the current word when
+looking up help on a Tcl command.")
+
+(defvar tcl-application "wish"
+  "*Name of Tcl application to run in inferior Tcl mode.")
+
+(defvar tcl-command-switches nil
+  "*Switches to supply to `tcl-application'.")
+
+(defvar tcl-prompt-regexp "^\\(% \\|\\)"
+  "*If not nil, a regexp that will match the prompt in the inferior process.
+If nil, the prompt is the name of the application with \">\" appended.
+
+The default is \"^\\(% \\|\\)\", which will match the default primary
+and secondary prompts for tclsh and wish.")
+
+(defvar inferior-tcl-source-command "source %s\n"
+  "*Format-string for building a Tcl command to load a file.
+This format string should use `%s' to substitute a file name
+and should result in a Tcl expression that will command the
+inferior Tcl to load that file.  The filename will be appropriately
+quoted for Tcl.")
+
+;;
+;; Keymaps, abbrevs, syntax tables.
+;;
+
+(defvar tcl-mode-abbrev-table nil
+  "Abbrev table in use in Tcl-mode buffers.")
+(if tcl-mode-abbrev-table
+    ()
+  (define-abbrev-table 'tcl-mode-abbrev-table ()))
+
+;; I sure wish Emacs had a package that made it easy to extract this
+;; sort of information.
+(defconst tcl-using-emacs-19 (string-match "19\\." emacs-version)
+  "Nil unless using Emacs 19 (Lucid or FSF).")
+
+;; FIXME this will break on Emacs 19.100.
+(defconst tcl-using-emacs-19.23
+  (string-match "19\\.\\(2[3-9]\\|[3-9][0-9]\\)" emacs-version)
+  "Nil unless using Emacs 19.23 or later.")
+
+(defconst tcl-using-lemacs-19 (string-match "Lucid" emacs-version)
+  "Nil unless using Lucid Emacs).")
+
+(defvar tcl-mode-map ()
+  "Keymap used in Tcl mode.")
+(if tcl-mode-map
+    ()
+  (setq tcl-mode-map (make-sparse-keymap))
+  (define-key tcl-mode-map "{" 'tcl-electric-char)
+  (define-key tcl-mode-map "}" 'tcl-electric-brace)
+  (define-key tcl-mode-map "[" 'tcl-electric-char)
+  (define-key tcl-mode-map "]" 'tcl-electric-char)
+  (define-key tcl-mode-map ";" 'tcl-electric-char)
+  (define-key tcl-mode-map "#" 'tcl-electric-hash)
+  ;; FIXME.
+  (define-key tcl-mode-map "\e\C-a" 'tcl-beginning-of-defun)
+  ;; FIXME.
+  (define-key tcl-mode-map "\e\C-e" 'tcl-end-of-defun)
+  ;; FIXME.
+  (define-key tcl-mode-map "\e\C-h" 'mark-tcl-function)
+  (define-key tcl-mode-map "\e\C-q" 'indent-tcl-exp)
+  (define-key tcl-mode-map "\177" 'backward-delete-char-untabify)
+  (define-key tcl-mode-map "\t" 'tcl-indent-command)
+  (define-key tcl-mode-map "\M-\C-x" 'tcl-eval-defun)
+  (and (fboundp 'comment-region)
+       (define-key tcl-mode-map "\C-c\C-c" 'comment-region))
+  (define-key tcl-mode-map "\C-c\C-d" 'tcl-help-on-word)
+  (define-key tcl-mode-map "\C-c\C-e" 'tcl-eval-defun)
+  (define-key tcl-mode-map "\C-c\C-l" 'tcl-load-file)
+  (define-key tcl-mode-map "\C-c\C-p" 'inferior-tcl)
+  (define-key tcl-mode-map "\C-c\C-r" 'tcl-eval-region)
+  (define-key tcl-mode-map "\C-c\C-z" 'switch-to-tcl))
+
+(defvar tcl-mode-syntax-table nil
+  "Syntax table in use in Tcl-mode buffers.")
+(if tcl-mode-syntax-table
+    ()
+  (setq tcl-mode-syntax-table (make-syntax-table))
+  (modify-syntax-entry ?%  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?@  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?&  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?*  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?+  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?-  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?.  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?:  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?!  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?$  "_" tcl-mode-syntax-table) ; FIXME use "'"?
+  (modify-syntax-entry ?/  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?~  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?<  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?=  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?>  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?|  "_" tcl-mode-syntax-table)
+  (modify-syntax-entry ?\(  "()" tcl-mode-syntax-table)
+  (modify-syntax-entry ?\)  ")(" tcl-mode-syntax-table)
+  (modify-syntax-entry ?\;  "." tcl-mode-syntax-table)
+  (modify-syntax-entry ?\n ">   " tcl-mode-syntax-table)
+  (modify-syntax-entry ?\f ">   " tcl-mode-syntax-table)
+  (modify-syntax-entry ?# "<   " tcl-mode-syntax-table))
+
+(defvar inferior-tcl-mode-map nil
+  "Keymap used in Inferior Tcl mode.")
+(if inferior-tcl-mode-map
+    ()
+  ;; FIXME Use keymap inheritance here?  FIXME we override comint
+  ;; keybindings here.  Maybe someone has a better set?
+  (setq inferior-tcl-mode-map (copy-keymap comint-mode-map))
+  (define-key inferior-tcl-mode-map "\e\C-a" 'tcl-beginning-of-defun)
+  (define-key inferior-tcl-mode-map "\e\C-e" 'tcl-end-of-defun)
+  (define-key inferior-tcl-mode-map "\177" 'backward-delete-char-untabify)
+  (define-key inferior-tcl-mode-map "\M-\C-x" 'tcl-eval-defun)
+  (define-key inferior-tcl-mode-map "\C-c\C-d" 'tcl-help-on-word)
+  (define-key inferior-tcl-mode-map "\C-c\C-e" 'tcl-eval-defun)
+  (define-key inferior-tcl-mode-map "\C-c\C-l" 'tcl-load-file)
+  (define-key inferior-tcl-mode-map "\C-c\C-p" 'inferior-tcl)
+  (define-key inferior-tcl-mode-map "\C-c\C-r" 'tcl-eval-region)
+  (define-key inferior-tcl-mode-map "\C-c\C-z" 'switch-to-tcl))
+
+;; Lucid Emacs menu.
+(defvar tcl-lucid-menu
+  '("Tcl"
+    ["Beginning of function" tcl-beginning-of-defun t]
+    ["End of function" tcl-end-of-defun t]
+    ["Mark function" mark-tcl-function t]
+    ["Indent region" indent-region t]
+    ["Comment region" comment-region t]
+    ["Uncomment region" tcl-uncomment-region t]
+    "----"
+    ["Show Tcl process buffer" inferior-tcl t]
+    ["Send function to Tcl process" tcl-eval-defun t]
+    ["Send region to Tcl process" tcl-eval-region t]
+    ["Send file to Tcl process" tcl-load-file t]
+    ["Restart Tcl process with file" tcl-restart-with-file t]
+    "----"
+    ["Tcl help" tcl-help-on-word t]))
+
+(defvar inferior-tcl-buffer nil
+  "*The current inferior-tcl process buffer.
+
+MULTIPLE PROCESS SUPPORT
+===========================================================================
+To run multiple Tcl processes, you start the first up with
+\\[inferior-tcl].  It will be in a buffer named `*inferior-tcl*'.
+Rename this buffer with \\[rename-buffer].  You may now start up a new
+process with another \\[inferior-tcl].  It will be in a new buffer,
+named `*inferior-tcl*'.  You can switch between the different process
+buffers with \\[switch-to-buffer].
+
+Commands that send text from source buffers to Tcl processes -- like
+`tcl-eval-defun' or `tcl-load-file' -- have to choose a process to
+send to, when you have more than one Tcl process around.  This is
+determined by the global variable `inferior-tcl-buffer'.  Suppose you
+have three inferior Lisps running:
+    Buffer              Process
+    foo                 inferior-tcl
+    bar                 inferior-tcl<2>
+    *inferior-tcl*      inferior-tcl<3>
+If you do a \\[tcl-eval-defun] command on some Lisp source code, what
+process do you send it to?
+
+- If you're in a process buffer (foo, bar, or *inferior-tcl*), 
+  you send it to that process.
+- If you're in some other buffer (e.g., a source file), you
+  send it to the process attached to buffer `inferior-tcl-buffer'.
+This process selection is performed by function `inferior-tcl-proc'.
+
+Whenever \\[inferior-tcl] fires up a new process, it resets
+`inferior-tcl-buffer' to be the new process's buffer.  If you only run
+one process, this does the right thing.  If you run multiple
+processes, you can change `inferior-tcl-buffer' to another process
+buffer with \\[set-variable].")
+
+;;
+;; Hooks and other customization.
+;;
+
+(defvar tcl-mode-hook nil
+  "Hook run on entry to Tcl mode.
+
+Several functions exist which are useful to run from your
+`tcl-mode-hook' (see each function's documentation for more
+information):
+
+  tcl-install-menubar
+    Puts a \"Tcl\" menu on the menubar.  Doesn't work in Emacs 18.
+  tcl-guess-application
+    Guesses a default setting for `tcl-application' based on any
+    \"#!\" line at the top of the file.
+  tcl-hashify-buffer
+    Quotes all \"#\" characters that don't correspond to actual
+    Tcl comments.  (Useful when editing code not originally created
+    with this mode).
+  tcl-auto-fill-mode
+    Auto-filling of Tcl comments.
+
+Emacs 19 users can add functions to the hook with `add-hook':
+
+   (add-hook 'tcl-mode-hook 'tcl-guess-application)
+
+Emacs 18 users must use `setq':
+
+   (setq tcl-mode-hook (cons 'tcl-guess-application tcl-mode-hook))")
+
+
+(defvar inferior-tcl-mode-hook nil
+  "Hook for customizing Inferior Tcl mode.")
+
+(defvar tcl-proc-list
+  '("proc")
+  "List of commands whose first argument defines something.
+This exists because some people (eg, me) use \"defvar\" et al.
+Call `tcl-set-proc-regexp' and `tcl-set-font-lock-keywords'
+after changing this list.")
+
+(defvar tcl-proc-regexp nil
+  "Regexp to use when matching proc headers.")
+
+(defvar tcl-typeword-list
+  '("global" "upvar")
+  "List of Tcl keywords deonting \"type\".  Used only for highlighting.
+Call `tcl-set-font-lock-keywords' after changing this list.")
+
+;; Generally I've picked control operators to be keywords.
+(defvar tcl-keyword-list
+  '("if" "then" "else" "elseif" "for" "foreach" "break" "continue" "while"
+    "eval" "case" "in" "switch" "default" "exit" "error" "proc" "return"
+    "uplevel" "loop" "for_array_keys" "for_recursive_glob" "for_file")
+  "List of Tcl keywords.  Used only for highlighting.
+Default list includes some TclX keywords.
+Call `tcl-set-font-lock-keywords' after changing this list.")
+
+(defvar tcl-font-lock-keywords nil
+  "Keywords to highlight for Tcl.  See variable `font-lock-keywords'.
+This variable is generally set from `tcl-proc-regexp',
+`tcl-typeword-list', and `tcl-keyword-list' by the function
+`tcl-set-font-lock-keywords'.")
+
+;; FIXME need some way to recognize variables because array refs look
+;; like 2 sexps.
+(defvar tcl-type-alist
+  '(
+    ("expr" tcl-expr)
+    ("catch" tcl-commands)
+    ("if" tcl-expr "then" tcl-commands)
+    ("elseif" tcl-expr "then" tcl-commands)
+    ("elseif" tcl-expr tcl-commands)
+    ("if" tcl-expr tcl-commands)
+    ("while" tcl-expr tcl-commands)
+    ("for" tcl-commands tcl-expr tcl-commands tcl-commands)
+    ("foreach" nil nil tcl-commands)
+    ("for_file" nil nil tcl-commands)
+    ("for_array_keys" nil nil tcl-commands)
+    ("for_recursive_glob" nil nil nil tcl-commands)
+    ;; Loop handling is not perfect, because the third argument can be
+    ;; either a command or an expr, and there is no real way to look
+    ;; forward.
+    ("loop" nil tcl-expr tcl-expr tcl-commands)
+    ("loop" nil tcl-expr tcl-commands)
+    )
+  "Alist that controls indentation.
+\(Actually, this really only controls what happens on continuation lines).
+Each entry looks like `(KEYWORD TYPE ...)'.
+Each type entry describes a sexp after the keyword, and can be one of:
+* nil, meaning that this sexp has no particular type.
+* tcl-expr, meaning that this sexp is an arithmetic expression.
+* tcl-commands, meaning that this sexp holds Tcl commands.
+* a string, which must exactly match the string at the corresponding
+  position for a match to be made.
+
+For example, the entry for the \"loop\" command is:
+
+   (\"loop\" nil tcl-expr tcl-commands)
+
+This means that the \"loop\" command has three arguments.  The first
+argument is ignored (for indentation purposes).  The second argument
+is a Tcl expression, and the last argument is Tcl commands.")
+
+(defvar tcl-explain-indentation nil
+  "If not `nil', debugging message will be printed during indentation.")
+
+
+
+;;
+;; Work around differences between various versions of Emacs.
+;;
+
+;; We use this because Lemacs 19.9 has what we need.
+(defconst tcl-pps-has-arg-6
+  (or tcl-using-emacs-19
+      (and tcl-using-lemacs-19
+	   (condition-case nil
+	       (progn
+		 (parse-partial-sexp (point) (point) nil nil nil t)
+		 t)
+	     (error nil))))
+  "t if using an emacs which supports sixth (\"commentstop\") argument
+to parse-partial-sexp.")
+
+;; Its pretty bogus to have to do this, but there is no easier way to
+;; say "match not syntax-1 and not syntax-2".  Too bad you can't put
+;; \s in [...].  This sickness is used in Emacs 19 to match a defun
+;; starter.  (It is used for this in v18 as well).
+;;(defconst tcl-omit-ws-regexp
+;;  (concat "^\\(\\s"
+;;	  (mapconcat 'char-to-string "w_.()\"\\$'/" "\\|\\s")
+;;	  "\\)\\S(*")
+;;  "Regular expression that matches everything except space, comment
+;;starter, and comment ender syntax codes.")
+
+;; FIXME?  Instead of using the hairy regexp above, we just use a
+;; simple one.
+;;(defconst tcl-omit-ws-regexp "^[^] \t\n#}]\\S(*"
+;;  "Regular expression used in locating function definitions.")
+
+;; Here's another stab.  I think this one actually works.  Now the
+;; problem seems to be that there is a bug in Emacs 19.22 where
+;; end-of-defun doesn't really use the brace matching the one that
+;; trails defun-prompt-regexp.
+(defconst tcl-omit-ws-regexp "^[^ \t\n#}][^\n}]+}*[ \t]+")
+
+(defun tcl-internal-beginning-of-defun (&optional arg)
+  "Move backward to next beginning-of-defun.
+With argument, do this that many times.
+Returns t unless search stops due to end of buffer."
+  (interactive "p")
+  (if (or (null arg) (= arg 0))
+      (setq arg 1))
+  (let (success)
+    (while (progn
+	     (setq arg (1- arg))
+	     (and (>= arg 0)
+		  (setq success
+			(re-search-backward tcl-omit-ws-regexp nil 'move 1))))
+      (while (and (looking-at "[]#}]")
+		  (setq success
+			(re-search-backward tcl-omit-ws-regexp nil 'move 1)))))
+    (beginning-of-line)
+    (not (null success))))
+
+(defun tcl-internal-end-of-defun (&optional arg)
+  "Move forward to next end of defun.
+An end of a defun is found by moving forward from the beginning of one."
+  (interactive "p")
+  (if (or (null arg) (= arg 0)) (setq arg 1))
+  (let ((start (point)))
+    ;; Was forward-char.  I think this works a little better.
+    (forward-line)
+    (tcl-beginning-of-defun)
+    (while (> arg 0)
+      (while (and (re-search-forward tcl-omit-ws-regexp nil 'move 1)
+		  (progn (beginning-of-line) t)
+		  (looking-at "[]#}]")
+		  (progn (forward-line) t)))
+      (let ((next-line (save-excursion 
+			 (forward-line)
+			 (point))))
+	(while (< (point) next-line)
+	  (forward-sexp)))
+      (forward-line)
+      (if (> (point) start) (setq arg (1- arg))))))
+
+;; In Emacs 19, we can use begining-of-defun as long as we set up a
+;; certain regexp.  In Emacs 18, we need our own function.
+(fset 'tcl-beginning-of-defun
+      (if tcl-using-emacs-19
+	  'beginning-of-defun
+	'tcl-internal-beginning-of-defun))
+
+;; Only FSF Emacs 19 works correctly using end-of-defun.  Emacs 18 and
+;; Lucid need our own function.
+(fset 'tcl-end-of-defun
+      (if (and tcl-using-emacs-19 (not tcl-using-lemacs-19))
+	  'end-of-defun
+	'tcl-internal-end-of-defun))
+
+
+
+;;
+;; Some helper functions.
+;;
+
+(defun tcl-set-proc-regexp ()
+  "Set `tcl-proc-regexp' from variable `tcl-proc-list'."
+  (setq tcl-proc-regexp (concat "^\\("
+				(mapconcat 'identity tcl-proc-list "\\|")
+				"\\)[ \t]+")))
+
+(defun tcl-set-font-lock-keywords ()
+  "Set `tcl-font-lock-keywords'.
+Uses variables `tcl-proc-regexp' and `tcl-keyword-list'."
+  (setq tcl-font-lock-keywords
+	(list
+	 ;; Names of functions (and other "defining things").
+	 (list (concat tcl-proc-regexp "\\([^ \t\n]+\\)")
+	       2 'font-lock-function-name-face)
+
+	 ;; Names of type-defining things.
+	 (list (concat "\\(\\s-\\|^\\)\\("
+		       ;; FIXME Use 'regexp-quote?
+		       (mapconcat 'identity tcl-typeword-list "\\|")
+		       "\\)\\(\\s-\\|$\\)")
+	       2 'font-lock-type-face)
+
+	 ;; Keywords.  Only recognized if surrounded by whitespace.
+	 ;; FIXME consider using "not word or symbol", not
+	 ;; "whitespace".
+	 (cons (concat "\\(\\s-\\|^\\)\\("
+		       ;; FIXME Use regexp-quote? 
+		       (mapconcat 'identity tcl-keyword-list "\\|")
+		       "\\)\\(\\s-\\|$\\)")
+	       2)
+	 )))
+
+(if tcl-proc-regexp
+    ()
+  (tcl-set-proc-regexp))
+
+(if tcl-font-lock-keywords
+    ()
+  (tcl-set-font-lock-keywords))
+
+
+
+;;
+;; The mode itself.
+;;
+
+(defun tcl-mode ()
+  "Major mode for editing Tcl code.
+Expression and list commands understand all Tcl brackets.
+Tab indents for Tcl code.
+Paragraphs are separated by blank lines only.
+Delete converts tabs to spaces as it moves back.
+
+Variables controlling indentation style:
+  tcl-indent-level
+    Indentation of Tcl statements within surrounding block.
+  tcl-continued-indent-level
+    Indentation of continuation line relative to first line of command.
+
+Variables controlling user interaction with mode (see variable
+documentation for details):
+  tcl-tab-always-indent
+    Controls action of TAB key.
+  tcl-auto-newline
+    Non-nil means automatically newline before and after braces, brackets,
+    and semicolons inserted in Tcl code.
+  tcl-electric-hash-style
+    Controls action of `#' key.
+  tcl-use-hairy-comment-detector
+    If t, use more complicated, but slower, comment detector.
+    This variable is only used in GNU Emacs 19.
+
+Turning on Tcl mode calls the value of the variable `tcl-mode-hook'
+with no args, if that value is non-nil.  Read the documentation for
+`tcl-mode-hook' to see what kinds of interesting hook functions
+already exist.
+
+Commands:
+\\{tcl-mode-map}"
+  (interactive)
+  (kill-all-local-variables)
+  (use-local-map tcl-mode-map)
+  (setq major-mode 'tcl-mode)
+  (setq mode-name "Tcl")
+  (setq local-abbrev-table tcl-mode-abbrev-table)
+  (set-syntax-table tcl-mode-syntax-table)
+  (make-local-variable 'paragraph-start)
+  (setq paragraph-start (concat "^$\\|" page-delimiter))
+  (make-local-variable 'paragraph-separate)
+  (setq paragraph-separate paragraph-start)
+  (make-local-variable 'paragraph-ignore-fill-prefix)
+  (setq paragraph-ignore-fill-prefix t)
+  (make-local-variable 'indent-line-function)
+  (setq indent-line-function 'tcl-indent-line)
+  ;; Tcl doesn't require a final newline.
+  ;; (make-local-variable 'require-final-newline)
+  ;; (setq require-final-newline t)
+  (make-local-variable 'comment-start)
+  (setq comment-start "# ")
+  (make-local-variable 'comment-start-skip)
+  (setq comment-start-skip "#+ *")
+  (make-local-variable 'comment-column)
+  (setq comment-column 40)
+  (make-local-variable 'comment-end)
+  (setq comment-end "")
+  (make-local-variable 'font-lock-keywords)
+  (setq font-lock-keywords tcl-font-lock-keywords)
+  (setq imenu-create-index-function 'tcl-imenu-create-index-function)
+  (make-local-variable 'parse-sexp-ignore-comments)
+  (if tcl-using-emacs-19
+      (progn
+	;; This can only be set to t in Emacs 19 and Lucid Emacs.
+	;; Emacs 18 and Epoch lose.
+	(setq parse-sexp-ignore-comments t)
+	;; Lucid Emacs has defun-prompt-regexp, but I don't believe
+	;; that it works for end-of-defun -- only for
+	;; beginning-of-defun.
+	(make-local-variable 'defun-prompt-regexp)
+	(setq defun-prompt-regexp tcl-omit-ws-regexp)
+	;; The following doesn't work in Lucid Emacs 19.6, but maybe
+	;; it will appear in later versions.
+	(make-local-variable 'add-log-current-defun-function)
+	(setq add-log-current-defun-function 'add-log-tcl-defun))
+    (setq parse-sexp-ignore-comments nil))
+  (run-hooks 'tcl-mode-hook))
+
+
+
+;; This is used for braces, brackets, and semi (except for closing
+;; braces, which are handled specially).
+(defun tcl-electric-char (arg)
+  "Insert character and correct line's indentation."
+  (interactive "p")
+  ;; Indent line first; this looks better if parens blink.
+  (tcl-indent-line)
+  (self-insert-command arg)
+  (if (and tcl-auto-newline (= last-command-char ?\;))
+      (progn
+	(newline)
+	(tcl-indent-line))))
+
+;; This is used for closing braces.  If tcl-auto-newline is set, can
+;; insert a newline both before and after the brace, depending on
+;; context.  FIXME should this be configurable?  Does anyone use this?
+(defun tcl-electric-brace (arg)
+  "Insert character and correct line's indentation."
+  (interactive "p")
+  ;; If auto-newlining and there is stuff on the same line, insert a
+  ;; newline first.
+  (if tcl-auto-newline
+      (progn
+	(if (save-excursion
+	      (skip-chars-backward " \t")
+	      (bolp))
+	    ()
+	  (tcl-indent-line)
+	  (newline))
+	;; In auto-newline case, must insert a newline after each
+	;; brace.  So an explicit loop is needed.
+	(while (> arg 0)
+	  (insert last-command-char)
+	  (tcl-indent-line)
+	  (newline)
+	  (setq arg (1- arg))))
+    (self-insert-command arg))
+  (tcl-indent-line))
+
+
+
+(defun tcl-indent-command (&optional arg)
+  "Indent current line as Tcl code, or in some cases insert a tab character.
+If tcl-tab-always-indent is t (the default), always indent current line.
+If tcl-tab-always-indent is nil and point is not in the indentation
+area at the beginning of the line, a TAB is inserted.
+Other values of tcl-tab-always-indent cause the first possible action
+from the following list to take place:
+
+  1. Move from beginning of line to correct indentation.
+  2. Delete an empty comment.
+  3. Move forward to start of comment, indenting if necessary.
+  4. Move forward to end of line, indenting if necessary.
+  5. Create an empty comment.
+  6. Move backward to start of comment, indenting if necessary."
+  (interactive "p")
+  (cond
+   ((not tcl-tab-always-indent)
+    ;; Indent if in identation area, otherwise insert TAB.
+    (if (<= (current-column) (current-indentation))
+	(tcl-indent-line)
+      (self-insert-command arg)))
+   ((eq tcl-tab-always-indent t)
+    ;; Always indent.
+    (tcl-indent-line))
+   (t
+    ;; "Perl-mode" style TAB command.
+    (let* ((ipoint (point))
+	   (eolpoint (progn
+		       (end-of-line)
+		       (point)))
+	   (comment-p (tcl-in-comment)))
+      (cond
+       ((= ipoint (save-excursion
+		    (beginning-of-line)
+		    (point)))
+	(beginning-of-line)
+	(tcl-indent-line)
+	;; If indenting didn't leave us in column 0, go to the
+	;; indentation.  Otherwise leave point at end of line.  This
+	;; is a hack.
+	(if (= (point) (save-excursion
+			 (beginning-of-line)
+			 (point)))
+	    (end-of-line)
+	  (back-to-indentation)))
+       ((and comment-p (looking-at "[ \t]*$"))
+	;; Empty comment, so delete it.  We also delete any ";"
+	;; characters at the end of the line.  I think this is
+	;; friendlier, but I don't know how other people will feel.
+	(backward-char)
+	(skip-chars-backward " \t;")
+	(delete-region (point) eolpoint))
+       ((and comment-p (< ipoint (point)))
+	;; Before comment, so skip to it.
+	(tcl-indent-line)
+	(indent-for-comment))
+       ((/= ipoint eolpoint)
+	;; Go to end of line (since we're not there yet).
+	(goto-char eolpoint)
+	(tcl-indent-line))
+       ((not comment-p)
+	;; Create an empty comment (since there isn't one on this
+	;; line).  If line is not blank, make sure we insert a ";"
+	;; first.
+	(beginning-of-line)
+	(if (/= (point) eolpoint)
+	    (progn
+	      (goto-char eolpoint)
+	      (or (tcl-real-command-p)
+		  (insert ";"))))
+	(tcl-indent-line)
+	(indent-for-comment))
+       (t
+	;; Go to start of comment.  We don't leave point where it is
+	;; because we want to skip comment-start-skip.
+	(tcl-indent-line)
+	(indent-for-comment)))))))
+
+(defun tcl-indent-line ()
+  "Indent current line as Tcl code.
+Return the amount the indentation changed by."
+  (let ((indent (calculate-tcl-indent nil))
+	beg shift-amt
+	(case-fold-search nil)
+	(pos (- (point-max) (point))))
+    (beginning-of-line)
+    (setq beg (point))
+    (cond ((eq indent nil)
+	   (setq indent (current-indentation)))
+	  (t
+	   (skip-chars-forward " \t")
+	   (if (listp indent) (setq indent (car indent)))
+	   (cond ((= (following-char) ?})
+		  (setq indent (- indent tcl-indent-level)))
+		 ((= (following-char) ?\])
+		  (setq indent (- indent 1))))))
+    (skip-chars-forward " \t")
+    (setq shift-amt (- indent (current-column)))
+    (if (zerop shift-amt)
+	(if (> (- (point-max) pos) (point))
+	    (goto-char (- (point-max) pos)))
+      (delete-region beg (point))
+      (indent-to indent)
+      ;; If initial point was within line's indentation,
+      ;; position after the indentation.  Else stay at same point in text.
+      (if (> (- (point-max) pos) (point))
+	  (goto-char (- (point-max) pos))))
+    shift-amt))
+
+(defun tcl-figure-type ()
+  "Determine type of sexp at point.
+This is either 'tcl-expr, 'tcl-commands, or nil.  Puts point at start
+of sexp that indicates types.
+
+See documentation for variable `tcl-type-alist' for more information."
+  (let ((count 0)
+	result
+	word-stack)
+    (while (and (< count 5)
+		(not result))
+      (condition-case nil
+	  (progn
+	    ;; FIXME should use "tcl-backward-sexp", which would skip
+	    ;; over entire variables, etc.
+	    (backward-sexp)
+	    (if (looking-at "[a-zA-Z_]+")
+		(let ((list tcl-type-alist)
+		      entry)
+		  (setq word-stack (cons (current-word) word-stack))
+		  (while (and list (not result))
+		    (setq entry (car list))
+		    (setq list (cdr list))
+		    (let ((index 0))
+		      (while (and entry (<= index count))
+			;; Abort loop if string does not match word on
+			;; stack.
+			(and (stringp (car entry))
+			     (not (string= (car entry)
+					   (nth index word-stack)))
+			     (setq entry nil))
+			(setq entry (cdr entry))
+			(setq index (1+ index)))
+		      (and (> index count)
+			   (not (stringp (car entry)))
+			   (setq result (car entry)))
+		      )))
+	      (setq word-stack (cons nil word-stack))))
+	(error nil))
+      (setq count (1+ count)))
+    (and tcl-explain-indentation
+	 (message "Indentation type %s" result))
+    result))
+
+(defun calculate-tcl-indent (&optional parse-start)
+  "Return appropriate indentation for current line as Tcl code.
+In usual case returns an integer: the column to indent to.
+Returns nil if line starts inside a string, t if in a comment."
+  (save-excursion
+    (beginning-of-line)
+    (let* ((indent-point (point))
+	   (case-fold-search nil)
+	   (continued-line 
+	    (save-excursion
+	      (if (bobp)
+		  nil
+		(backward-char)
+		(= ?\\ (preceding-char)))))
+	   (continued-indent-value (if continued-line
+				       tcl-continued-indent-level
+				     0))
+	   state
+	   containing-sexp
+	   found-next-line)
+      (if parse-start
+	  (goto-char parse-start)
+	(tcl-beginning-of-defun))
+      (while (< (point) indent-point)
+	(setq parse-start (point))
+	(setq state (parse-partial-sexp (point) indent-point 0))
+	(setq containing-sexp (car (cdr state))))
+      (cond ((or (nth 3 state) (nth 4 state))
+	     ;; Inside comment or string.  Return nil or t if should
+	     ;; not change this line
+	     (nth 4 state))
+	    ((null containing-sexp)
+	     ;; Line is at top level.
+	     continued-indent-value)
+	    (t
+	     ;; Set expr-p if we are looking at the expression part of
+	     ;; an "if", "expr", etc statement.  Set commands-p if we
+	     ;; are looking at the body part of an if, while, etc
+	     ;; statement.  FIXME Should check for "for" loops here.
+	     (goto-char containing-sexp)
+	     (let* ((sexpr-type (tcl-figure-type))
+		    (expr-p (eq sexpr-type 'tcl-expr))
+		    (commands-p (eq sexpr-type 'tcl-commands))
+		    (expr-start (point)))
+	       ;; Find the first statement in the block and indent
+	       ;; like it.  The first statement in the block might be
+	       ;; on the same line, so what we do is skip all
+	       ;; "virtually blank" lines, looking for a non-blank
+	       ;; one.  A line is virtually blank if it only contains
+	       ;; a comment and whitespace.  FIXME continued comments
+	       ;; aren't supported.  They are a wart on Tcl anyway.
+	       ;; We do it this funky way because we want to know if
+	       ;; we've found a statement on some line _after_ the
+	       ;; line holding the sexp opener.
+	       (goto-char containing-sexp)
+	       (forward-char)
+	       (if (and (< (point) indent-point)
+			(looking-at "[ \t]*\\(#.*\\)?$"))
+		   (progn
+		     (forward-line)
+		     (while (and (< (point) indent-point)
+				 (looking-at "[ \t]*\\(#.*\\)?$"))
+		       (setq found-next-line t)
+		       (forward-line))))
+	       (if (or continued-line
+		       (/= (char-after containing-sexp) ?{)
+		       expr-p)
+		   (progn
+		     ;; Line is continuation line, or the sexp opener
+		     ;; is not a curly brace, or we are are looking at
+		     ;; an `expr' expression (which must be split
+		     ;; specially).  So indentation is column of first
+		     ;; good spot after sexp opener (with some added
+		     ;; in the continued-line case).  If there is no
+		     ;; nonempty line before the indentation point, we
+		     ;; use the column of the character after the sexp
+		     ;; opener.
+		     (if (>= (point) indent-point)
+			 (progn
+			   (goto-char containing-sexp)
+			   (forward-char))
+		       (skip-chars-forward " \t"))
+		     (+ (current-column) continued-indent-value))
+		 ;; After a curly brace, and not a continuation line.
+		 ;; So take indentation from first good line after
+		 ;; start of block, unless that line is on the same
+		 ;; line as the opening brace.  In this case use the
+		 ;; indentation of the opening brace's line, plus
+		 ;; another indent step.  If we are in the body part
+		 ;; of an "if" or "while" then the indentation is
+		 ;; taken from the line holding the start of the
+		 ;; statement.
+		 (if (and (< (point) indent-point)
+			  found-next-line)
+		     (current-indentation)
+		   (if commands-p
+		       (goto-char expr-start)
+		     (goto-char containing-sexp))
+		   (+ (current-indentation) tcl-indent-level)))))))))
+
+
+
+(defun mark-tcl-function ()
+  "Put mark at end of Tcl function, point at beginning."
+  (interactive)
+  (push-mark (point))
+  (tcl-end-of-defun)
+  (if tcl-using-emacs-19
+      (push-mark (point) nil t)
+    (push-mark (point)))
+  (tcl-beginning-of-defun)
+  (backward-paragraph))
+
+
+
+(defun indent-tcl-exp ()
+  "Indent each line of the Tcl grouping following point."
+  (interactive)
+  (let ((indent-stack (list nil))
+	(contain-stack (list (point)))
+	(case-fold-search nil)
+	outer-loop-done inner-loop-done state ostate
+	this-indent last-sexp continued-line
+	(next-depth 0)
+	last-depth)
+    (save-excursion
+      (forward-sexp 1))
+    (save-excursion
+      (setq outer-loop-done nil)
+      (while (and (not (eobp)) (not outer-loop-done))
+	(setq last-depth next-depth)
+	;; Compute how depth changes over this line
+	;; plus enough other lines to get to one that
+	;; does not end inside a comment or string.
+	;; Meanwhile, do appropriate indentation on comment lines.
+	(setq inner-loop-done nil)
+	(while (and (not inner-loop-done)
+		    (not (and (eobp) (setq outer-loop-done t))))
+	  (setq ostate state)
+	  (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
+					  nil nil state))
+	  (setq next-depth (car state))
+	  (if (and (car (cdr (cdr state)))
+		   (>= (car (cdr (cdr state))) 0))
+	      (setq last-sexp (car (cdr (cdr state)))))
+	  (if (or (nth 4 ostate))
+	      (tcl-indent-line))
+	  (if (or (nth 3 state))
+	      (forward-line 1)
+	    (setq inner-loop-done t)))
+	(if (<= next-depth 0)
+	    (setq outer-loop-done t))
+	(if outer-loop-done
+	    nil
+	  ;; If this line had ..))) (((.. in it, pop out of the levels
+	  ;; that ended anywhere in this line, even if the final depth
+	  ;; doesn't indicate that they ended.
+	  (while (> last-depth (nth 6 state))
+	    (setq indent-stack (cdr indent-stack)
+		  contain-stack (cdr contain-stack)
+		  last-depth (1- last-depth)))
+	  (if (/= last-depth next-depth)
+	      (setq last-sexp nil))
+	  ;; Add levels for any parens that were started in this line.
+	  (while (< last-depth next-depth)
+	    (setq indent-stack (cons nil indent-stack)
+		  contain-stack (cons nil contain-stack)
+		  last-depth (1+ last-depth)))
+	  (if (null (car contain-stack))
+	      (setcar contain-stack 
+		      (or (car (cdr state))
+			  (save-excursion
+			    (forward-sexp -1)
+			    (point)))))
+	  (forward-line 1)
+	  (setq continued-line 
+		(save-excursion
+		  (backward-char)
+		  (= (preceding-char) ?\\)))
+	  (skip-chars-forward " \t")
+	  (if (eolp)
+	      nil
+	    (if (and (car indent-stack)
+		     (>= (car indent-stack) 0))
+		;; Line is on an existing nesting level.
+		(setq this-indent (car indent-stack))
+	      ;; Just started a new nesting level.
+	      ;; Compute the standard indent for this level.
+	      (let ((val (calculate-tcl-indent
+			  (if (car indent-stack)
+			      (- (car indent-stack))))))
+		(setcar indent-stack
+			(setq this-indent val))
+		(setq continued-line nil)))
+	    (cond ((not (numberp this-indent)))
+		  ((= (following-char) ?})
+		   (setq this-indent (- this-indent tcl-indent-level)))
+		  ((= (following-char) ?\])
+		   (setq this-indent (- this-indent 1))))
+	    ;; Put chosen indentation into effect.
+	    (or (null this-indent)
+		(= (current-column) 
+		   (if continued-line 
+		       (+ this-indent tcl-indent-level)
+		     this-indent))
+		(progn
+		  (delete-region (point) (progn (beginning-of-line) (point)))
+		  (indent-to 
+		   (if continued-line 
+		       (+ this-indent tcl-indent-level)
+		     this-indent)))))))))
+  )
+
+
+
+;;
+;; Interfaces to other packages.
+;;
+
+(defun tcl-imenu-create-index-function ()
+  "Generate alist of indices for imenu."
+  (let ((re (concat tcl-proc-regexp "\\([^ \t\n{]+\\)"))
+	alist)
+    (imenu-progress-message 0)
+    (goto-char (point-min))
+    (while (re-search-forward re nil t)
+      (imenu-progress-message nil)
+      ;; Position on start of proc name, not beginning of line.
+      (setq alist (cons
+		   (cons (buffer-substring (match-beginning 2) (match-end 2))
+			 (match-beginning 2))
+		   alist)))
+    (imenu-progress-message 100)
+    (nreverse alist)))
+
+;; FIXME Definition of function is very ad-hoc.  Should use
+;; tcl-beginning-of-defun.  Also has incestuous knowledge about the
+;; format of tcl-proc-regexp.
+(defun add-log-tcl-defun ()
+  "Return name of Tcl function point is in, or nil."
+  (save-excursion
+    (if (re-search-backward
+	 (concat tcl-proc-regexp "\\([^ \t\n{]+\\)") nil t)
+	(buffer-substring (match-beginning 2)
+			  (match-end 2)))))
+
+
+
+;;
+;; Helper functions for inferior Tcl mode.
+;;
+
+;; This exists to let us delete the prompt when commands are sent
+;; directly to the inferior Tcl.  See gud.el for an explanation of how
+;; it all works (I took it from there).  This stuff doesn't really
+;; work as well as I'd like it to.  But I don't believe there is
+;; anything useful that can be done.
+(defvar inferior-tcl-delete-prompt-marker nil)
+
+(defun tcl-filter (proc string)
+  (let ((inhibit-quit t))
+    (save-excursion
+      (set-buffer (process-buffer proc))
+      (goto-char (process-mark proc))
+      ;; Delete prompt if requested.
+      (if (marker-buffer inferior-tcl-delete-prompt-marker)
+	  (progn
+	    (delete-region (point) inferior-tcl-delete-prompt-marker)
+	    (set-marker inferior-tcl-delete-prompt-marker nil)))))
+  (comint-output-filter proc string))
+
+(defun tcl-send-string (proc string)
+  (save-excursion
+    (set-buffer (process-buffer proc))
+    (goto-char (process-mark proc))
+    (beginning-of-line)
+    (if (looking-at comint-prompt-regexp)
+	(set-marker inferior-tcl-delete-prompt-marker (point))))
+  (comint-send-string proc string))
+
+(defun tcl-send-region (proc start end)
+  (save-excursion
+    (set-buffer (process-buffer proc))
+    (goto-char (process-mark proc))
+    (beginning-of-line)
+    (if (looking-at comint-prompt-regexp)
+	(set-marker inferior-tcl-delete-prompt-marker (point))))
+  (comint-send-region proc start end))
+
+(defun switch-to-tcl (eob-p)
+  "Switch to inferior Tcl process buffer.
+With argument, positions cursor at end of buffer."
+  (interactive "P")
+  (if (get-buffer inferior-tcl-buffer)
+      (pop-to-buffer inferior-tcl-buffer)
+    (error "No current inferior Tcl buffer"))
+  (cond (eob-p
+	 (push-mark)
+	 (goto-char (point-max)))))
+
+(defun inferior-tcl-proc ()
+  "Return current inferior Tcl process.
+See variable `inferior-tcl-buffer'."
+  (let ((proc (get-buffer-process (if (eq major-mode 'inferior-tcl-mode)
+				      (current-buffer)
+				    inferior-tcl-buffer))))
+    (or proc
+	(error "No Tcl process; see variable `inferior-tcl-buffer'"))))
+
+(defun tcl-eval-region (start end &optional and-go)
+  "Send the current region to the inferior Tcl process.
+Prefix argument means switch to the Tcl buffer afterwards."
+  (interactive "r\nP")
+  (let ((proc (inferior-tcl-proc)))
+    (tcl-send-region proc start end)
+    (tcl-send-string proc "\n")
+    (if and-go (switch-to-tcl t))))
+
+(defun tcl-eval-defun (&optional and-go)
+  "Send the current defun to the inferior Tcl process.
+Prefix argument means switch to the Tcl buffer afterwards."
+  (interactive "P")
+  (save-excursion
+    (tcl-end-of-defun)
+    (let ((end (point)))
+      (tcl-beginning-of-defun)
+      (tcl-eval-region (point) end)))
+  (if and-go (switch-to-tcl t)))
+
+
+
+;;
+;; Inferior Tcl mode itself.
+;;
+
+(defun inferior-tcl-mode ()
+  "Major mode for interacting with Tcl interpreter.
+
+A Tcl process can be started with M-x inferior-tcl.
+
+Entry to this mode runs the hooks comint-mode-hook and
+inferior-tcl-mode-hook, in that order.
+
+You can send text to the inferior Tcl process from other buffers
+containing Tcl source.
+
+Variables controlling Inferior Tcl mode:
+  tcl-application
+    Name of program to run.
+  tcl-command-switches
+    Command line arguments to `tcl-application'.
+  tcl-prompt-regexp
+    Matches prompt.
+  inferior-tcl-source-command
+    Command to use to read Tcl file in running application.
+  inferior-tcl-buffer
+    The current inferior Tcl process buffer.  See variable
+    documentation for details on multiple-process support.
+
+The following commands are available:
+\\{inferior-tcl-mode-map}"
+  (interactive)
+  (comint-mode)
+  (setq comint-prompt-regexp (or tcl-prompt-regexp
+				 (concat "^"
+					 (regexp-quote tcl-application)
+					 ">")))
+  (setq major-mode 'inferior-tcl-mode)
+  (setq mode-name "Inferior Tcl")
+  (setq mode-line-process '(": %s"))
+  (use-local-map inferior-tcl-mode-map)
+  (setq local-abbrev-table tcl-mode-abbrev-table)
+  (set-syntax-table tcl-mode-syntax-table)
+  (if tcl-using-emacs-19
+      (progn
+	(make-local-variable 'defun-prompt-regexp)
+	(setq defun-prompt-regexp tcl-omit-ws-regexp)))
+  (make-local-variable 'inferior-tcl-delete-prompt-marker)
+  (setq inferior-tcl-delete-prompt-marker (make-marker))
+  (set-process-filter (get-buffer-process (current-buffer)) 'tcl-filter)
+  (run-hooks 'inferior-tcl-mode-hook))
+
+(defun inferior-tcl (cmd)
+  "Run inferior Tcl process.
+Prefix arg means enter program name interactively.
+See documentation for function `inferior-tcl-mode' for more information."
+  (interactive
+   (list (if current-prefix-arg
+	     (read-string "Run Tcl: " tcl-application)
+	   tcl-application)))
+  (if (not (comint-check-proc "*inferior-tcl*"))
+      (progn
+	(set-buffer (apply (function make-comint) "inferior-tcl" cmd nil
+			   tcl-command-switches))
+	(inferior-tcl-mode)))
+  (make-local-variable 'tcl-application)
+  (setq tcl-application cmd)
+  (setq inferior-tcl-buffer "*inferior-tcl*")
+  (switch-to-buffer "*inferior-tcl*"))
+
+(and (fboundp 'defalias)
+     (defalias 'run-tcl 'inferior-tcl))
+
+
+
+;;
+;; Auto-fill support.
+;;
+
+(defun tcl-real-command-p ()
+  "Return nil if point is not at the beginning of a command.
+A command is the first word on an otherwise empty line, or the
+first word following a semicolon, opening brace, or opening bracket."
+  (save-excursion
+    (skip-chars-backward " \t")
+    (cond
+     ((bobp) t)
+     ((bolp)
+      (backward-char)
+      ;; Note -- continued comments are not supported here.  I
+      ;; consider those to be a wart on the language.
+      (not (eq ?\\ (preceding-char))))
+     (t
+      (memq (preceding-char) '(?\; ?{ ?\[))))))
+
+;; FIXME doesn't actually return t.  See last case.
+(defun tcl-real-comment-p ()
+  "Return t if point is just after the `#' beginning a real comment.
+Does not check to see if previous char is actually `#'.
+A real comment is either at the beginning of the buffer,
+preceeded only by whitespace on the line, or has a preceeding
+semicolon, opening brace, or opening bracket on the same line."
+  (save-excursion
+    (backward-char)
+    (tcl-real-command-p)))
+
+(defun tcl-hairy-scan-for-comment (state end always-stop)
+  "Determine if point is in a comment.
+Returns a list of the form `(FLAG . STATE)'.  STATE can be used
+as input to future invocations.  FLAG is nil if not in comment,
+t otherwise.  If in comment, leaves point at beginning of comment.
+Only works in Emacs 19.  See also `tcl-simple-scan-for-comment', a
+simpler version that is often right, and works in Emacs 18."
+  (let ((bol (save-excursion
+	       (goto-char end)
+	       (beginning-of-line)
+	       (point)))
+	real-comment
+	last-cstart)
+    (while (and (not last-cstart) (< (point) end))
+      (setq real-comment nil)		;In case we've looped around and it is
+                                        ;set.
+      (setq state (parse-partial-sexp (point) end nil nil state t))
+      (if (nth 4 state)
+	  (progn
+	    ;; If ALWAYS-STOP is set, stop even if we don't have a
+	    ;; real comment, or if the comment isn't on the same line
+	    ;; as the end.
+	    (if always-stop (setq last-cstart (point)))
+	    ;; If we have a real comment, then set the comment
+	    ;; starting point if we are on the same line as the ending
+	    ;; location.
+	    (setq real-comment (tcl-real-comment-p))
+	    (if real-comment
+		(progn
+		  (and (> (point) bol) (setq last-cstart (point)))
+		  ;; NOTE Emacs 19 has a misfeature whereby calling
+		  ;; parse-partial-sexp with COMMENTSTOP set and with
+		  ;; an initial list that says point is in a comment
+		  ;; will cause an immediate return.  So we must skip
+		  ;; over the comment ourselves.
+		  (beginning-of-line 2)))
+	    ;; Frob the state to make it look like we aren't in a
+	    ;; comment.
+	    (setcar (nthcdr 4 state) nil))))
+    (and last-cstart
+	 (goto-char last-cstart))
+    (cons real-comment state)))
+
+(defun tcl-hairy-in-comment ()
+  "Return t if point is in a comment, and leave point at beginning
+of comment."
+  (let ((save (point)))
+    (tcl-beginning-of-defun)
+    (car (tcl-hairy-scan-for-comment nil save nil))))
+	
+(defun tcl-simple-in-comment ()
+  "Return t if point is in comment, and leave point at beginning
+of comment.  This is faster that `tcl-hairy-in-comment', but is
+correct less often."
+  (let ((save (point))
+	comment)
+    (beginning-of-line)
+    (while (and (< (point) save) (not comment))
+      (search-forward "#" save 'move)
+      (setq comment (tcl-real-comment-p)))
+    comment))
+
+(defun tcl-in-comment ()
+  "Return t if point is in comment, and leave point at beginning
+of comment."
+  (if (and tcl-pps-has-arg-6
+	   tcl-use-hairy-comment-detector)
+      (tcl-hairy-in-comment)
+    (tcl-simple-in-comment)))
+
+(defun tcl-do-auto-fill ()
+  "Auto-fill function for Tcl mode.  Only auto-fills in a comment."
+  (let (in-comment
+	col)
+    (save-excursion
+      (setq in-comment (tcl-in-comment))
+      (if in-comment
+	  (setq col (1- (current-column)))))
+    (if in-comment
+	(progn
+	  (do-auto-fill)
+	  (save-excursion
+	    (back-to-indentation)
+	    (delete-region (point) (save-excursion
+				     (beginning-of-line)
+				     (point)))
+	    (indent-to-column col))))))
+
+
+
+;;
+;; Help-related code.
+;;
+
+(defvar tcl-help-saved-dir nil
+  "Saved help directory.  If `tcl-help-directory' changes, this allows
+tcl-help-on-word to update the alist")
+
+(defvar tcl-help-alist nil
+  "Alist with command names as keys and filenames as values.")
+
+(defun tcl-help-snarf-commands (dir)
+  "Build alist of commands and filenames.  There is probably a much
+better implementation of this, but I'm too tired to think of it right
+now."
+  (let ((files (directory-files dir t)))
+    (while files
+      (if (and (file-directory-p (car files))
+	       (not
+		(let ((fpart (file-name-nondirectory (car files))))
+		  (or (equal fpart ".")
+		      (equal fpart "..")))))
+	  (let ((matches (directory-files (car files) t)))
+	    (while matches
+	      (or (file-directory-p (car matches))
+		  (setq tcl-help-alist
+			(cons
+			 (cons (file-name-nondirectory (car matches))
+			       (car matches))
+			 tcl-help-alist)))
+	      (setq matches (cdr matches)))))
+      (setq files (cdr files)))))
+
+(defun tcl-reread-help-files ()
+  "Set up to re-read files, and then do it."
+  (interactive)
+  (message "Building Tcl help file index...")
+  (setq tcl-help-saved-dir tcl-help-directory)
+  (setq tcl-help-alist nil)
+  (tcl-help-snarf-commands tcl-help-directory)
+  (message "Building Tcl help file index...done"))
+
+(defun tcl-current-word (flag)
+  "Return current command word, or nil.
+If FLAG is nil, just uses `current-word'.
+Otherwise scans backward for most likely Tcl command word."
+  (if (and flag (eq major-mode 'tcl-mode))
+      (condition-case nil
+	  (save-excursion
+	    ;; Look backward for first word actually in alist.
+	    (if (bobp)
+		()
+	      (while (and (not (bobp))
+			  (not (tcl-real-command-p)))
+		(backward-sexp)))
+	    (if (assoc (current-word) tcl-help-alist)
+		(current-word)))
+	(error nil))
+    (current-word)))
+
+(defun tcl-help-on-word (command &optional arg)
+  "Get help on Tcl command.  Default is word at point.
+Prefix argument means invert sense of `tcl-use-smart-word-finder'."
+  (interactive
+   (list
+    (progn
+      (if (not (string= tcl-help-directory tcl-help-saved-dir))
+	  (tcl-reread-help-files))
+      (let ((word (tcl-current-word
+		   (if current-prefix-arg
+		       (not tcl-use-smart-word-finder)
+		     tcl-use-smart-word-finder))))
+	(completing-read
+	 (if (or (null word) (string= word ""))
+	     "Help on Tcl command: "
+	   (format "Help on Tcl command (default %s): " word))
+	 tcl-help-alist nil t)))
+    current-prefix-arg))
+  (if (not (string= tcl-help-directory tcl-help-saved-dir))
+      (tcl-reread-help-files))
+  (if (string= command "")
+      (setq command (tcl-current-word
+		     (if arg
+			 (not tcl-use-smart-word-finder)
+		       tcl-use-smart-word-finder))))
+  (let* ((help (get-buffer-create "*Tcl help*"))
+	 (cell (assoc command tcl-help-alist))
+	 (file (and cell (cdr cell))))
+    (set-buffer help)
+    (delete-region (point-min) (point-max))
+    (if file
+	(progn
+	  (insert "*** " command "\n\n")
+	  (insert-file-contents file))
+      (if (string= command "")
+	  (insert "Magical Pig!")
+	(insert "Tcl command " command " not in help\n")))
+    (set-buffer-modified-p nil)
+    (goto-char (point-min))
+    (display-buffer help)))
+
+
+
+;;
+;; Other interactive stuff.
+;;
+
+(defvar tcl-previous-dir/file nil
+  "Record last directory and file used in loading.
+This holds a cons cell of the form `(DIRECTORY . FILE)'
+describing the last `tcl-load-file' command.")
+
+(defun tcl-load-file (file &optional and-go)
+  "Load a Tcl file into the inferior Tcl process.
+Prefix argument means switch to the Tcl buffer afterwards."
+  (interactive
+   (list
+    ;; car because comint-get-source returns a list holding the
+    ;; filename.
+    (car (comint-get-source "Load Tcl file: " tcl-previous-dir/file
+			    '(tcl-mode) t))
+    current-prefix-arg))
+  (comint-check-source file)
+  (setq tcl-previous-dir/file (cons (file-name-directory file)
+				    (file-name-nondirectory file)))
+  (tcl-send-string (inferior-tcl-proc)
+		   (format inferior-tcl-source-command (tcl-quote file)))
+  (if and-go (switch-to-tcl t)))
+
+;; Maybe this should work just like tcl-load-file.  But I think what
+;; I've implemented will turn out to be more useful.
+(defun tcl-restart-with-file (file &optional and-go)
+  "Restart inferior Tcl with file.
+If an inferior Tcl process exists, it is killed first.
+Prefix argument means switch to the Tcl buffer afterwards."
+  (interactive
+   (list
+    (car (comint-get-source "Restart with Tcl file: "
+			    (or (and
+				 (eq major-mode 'tcl-mode)
+				 (buffer-file-name))
+				tcl-previous-dir/file)
+			    '(tcl-mode) t))
+    current-prefix-arg))
+  (let* ((buf (if (eq major-mode 'inferior-tcl-mode)
+		  (current-buffer)
+		inferior-tcl-buffer))
+	 (proc (and buf (get-process buf))))
+    (cond
+     ((not (and buf (get-buffer buf)))
+      ;; I think this will be ok.
+      (inferior-tcl tcl-application)
+      (tcl-load-file file and-go))
+     ((or
+       (not (comint-check-proc buf))
+       (yes-or-no-p
+	"A Tcl process is running, are you sure you want to reset it? "))
+      (save-excursion
+	(comint-check-source file)
+	(setq tcl-previous-dir/file (cons (file-name-directory file)
+					  (file-name-nondirectory file)))
+	(comint-exec (get-buffer-create buf)
+		     (if proc
+			 (process-name proc)
+		       "inferior-tcl")
+		     tcl-application file tcl-command-switches)
+	(if and-go (switch-to-tcl t)))))))
+
+;; FIXME I imagine you can do this under Emacs 18.  I just don't know
+;; how.
+(defun tcl-auto-fill-mode (&optional arg)
+  "Like `auto-fill-mode', but controls filling of Tcl comments."
+  (interactive "P")
+  (and (not tcl-using-emacs-19)
+       (error "You must use Emacs 19 to get this feature."))
+  ;; Following code taken from "auto-fill-mode" (simple.el).
+  (prog1
+      (setq auto-fill-function
+	    (if (if (null arg)
+		    (not auto-fill-function)
+		  (> (prefix-numeric-value arg) 0))
+		'tcl-do-auto-fill
+	      nil))
+    ;; Update mode line.  FIXME I'd use force-mode-line-update, but I
+    ;; don't know if it exists in v18.
+    (set-buffer-modified-p (buffer-modified-p))))
+
+(defun tcl-electric-hash (&optional count)
+  "Insert a `#' and quote if it does not start a real comment.
+Prefix arg is number of `#'s to insert.
+See variable `tcl-electric-hash-style' for description of quoting
+styles."
+  (interactive "p")
+  (or count (setq count 1))
+  (if (> count 0)
+      (let ((type
+	     (if (eq tcl-electric-hash-style 'smart)
+		 (if (> count 3)	; FIXME what is "smart"?
+		     'quote
+		   'backslash)
+	       tcl-electric-hash-style))
+	    comment)
+	(if type
+	    (progn
+	      (save-excursion
+		(insert "#")
+		(setq comment (tcl-in-comment)))
+	      (delete-char 1)
+	      (and tcl-explain-indentation (message "comment: %s" comment))
+	      (cond
+	       ((eq type 'quote)
+		(if (not comment)
+		    (insert "\"")))
+	       ((eq type 'backslash)
+		;; The following will set count to 0, so the
+		;; insert-char can still be run.
+		(if (not comment)
+		    (while (> count 0)
+		      (insert "\\#")
+		      (setq count (1- count)))))
+	       (t nil))))
+	(insert-char ?# count))))
+
+(defun tcl-hashify-buffer ()
+  "Quote all `#'s in current buffer that aren't Tcl comments."
+  (interactive)
+  (save-excursion
+    (goto-char (point-min))
+    (if (and tcl-pps-has-arg-6 tcl-use-hairy-comment-detector)
+	(let (state
+	      result)
+	  (while (< (point) (point-max))
+	    (setq result (tcl-hairy-scan-for-comment state (point-max) t))
+	    (if (car result)
+		(beginning-of-line 2)
+	      (backward-char)
+	      (if (eq ?# (following-char))
+		  (insert "\\"))
+	      (forward-char))
+	    (setq state (cdr result))))
+      (while (and (< (point) (point-max))
+		  (search-forward "#" nil 'move))
+	(if (tcl-real-comment-p)
+	    (beginning-of-line 2)
+	  ;; There's really no good way for the simple converter to
+	  ;; work.  So we just quote # if it isn't already quoted.
+	  ;; Bogus, but it works.
+	  (backward-char)
+	  (if (not (eq ?\\ (preceding-char)))
+	      (insert "\\"))
+	  (forward-char))))))
+
+;; The following was inspired by the Tcl editing mode written by
+;; Gregor Schmid <schmid@fb3-s7.math.TU-Berlin.DE>.  His version also
+;; attempts to snarf the command line options from the command line,
+;; but I didn't think that would really be that helpful (doesn't seem
+;; like it owould be right enough.  His version also looks for the
+;; "#!/bin/csh ... exec" hack, but that seemed even less useful.
+(defun tcl-guess-application ()
+  "Attempt to guess Tcl application by looking at first line.
+The first line is assumed to look like \"#!.../program ...\"."
+  (save-excursion
+    (goto-char (point-min))
+    (if (looking-at "#![^ \t]*/\\([^ \t/]+\\)\\([ \t]\\|$\\)")
+	(progn
+	  (make-local-variable 'tcl-application)
+	  (setq tcl-application (buffer-substring (match-beginning 1)
+						  (match-end 1)))))))
+
+;; This only exists to put on the menubar.  I couldn't figure out any
+;; other way to do it.  FIXME should take "number of #-marks"
+;; argument.
+(defun tcl-uncomment-region (beg end)
+  "Uncomment region."
+  (interactive "r")
+  (comment-region beg end -1))
+
+
+
+;;
+;; Lucid menu support.
+;; Taken from schmid@fb3-s7.math.TU-Berlin.DE (Gregor Schmid),
+;; who wrote a different Tcl mode.
+;; We also have simple support for menus in FSF.  We do this by
+;; loading the Lucid menu emulation code.
+;;
+
+;; Put this into your tcl-mode-hook.
+(defun tcl-install-menubar ()
+  (and tcl-using-emacs-19
+       (not tcl-using-lemacs-19)
+       (if tcl-using-emacs-19.23
+	   (require 'menubar)
+	 ;; CAVEATS:
+	 ;; * lmenu.el provides 'menubar, which is bogus.
+	 ;; * lmenu.el causes menubars to be turned on everywhere.
+	 ;;   Doubly bogus!
+	 ;; Both of these problems are fixed in Emacs 19.23.  People
+	 ;; using an Emacs before that just suffer.
+	 (require 'menubar "lmenu")))
+  (if (not (assoc "Tcl" current-menubar))
+      (progn
+	(set-buffer-menubar (copy-sequence current-menubar))
+	(add-menu nil "Tcl" (cdr tcl-lucid-menu))))
+  ;; You might want to do something like the below.  I have it
+  ;; commented out because it overrides existing bindings.
+  ;; For Lucid:
+  ;;   (define-key tcl-mode-map 'button3 'tcl-popup-menu)
+  ;; For FSF:
+  ;;   (define-key tcl-mode-map [down-mouse-3] 'tcl-popup-menu)
+  )
+
+(defun tcl-popup-menu (e)
+  (interactive "e")
+  (and tcl-using-emacs-19
+       (not tcl-using-lemacs-19)
+       (if tcl-using-emacs-19.23
+	   (require 'menubar)
+	 ;; CAVEATS:
+	 ;; * lmenu.el provides 'menubar, which is bogus.
+	 ;; * lmenu.el causes menubars to be turned on everywhere.
+	 ;;   Doubly bogus!
+	 ;; Both of these problems are fixed in Emacs 19.23.  People
+	 ;; using an Emacs before that just suffer.
+	 (require 'menubar "lmenu")))  ;; This is annoying
+  ;;(mouse-set-point e)
+  ;; IMHO popup-menu should be autoloaded.  Oh well.
+  (popup-menu tcl-lucid-menu))
+
+
+
+;;
+;; Quoting and unquoting functions.
+;;
+
+;; This quoting is sufficient to protect eg a filename from any sort
+;; of expansion or splitting.  Tcl quoting sure sucks.
+(defun tcl-quote (string)
+  "Quote STRING according to Tcl rules."
+  (mapconcat (function (lambda (char)
+			 (if (memq char '(?[ ?] ?{ ?} ?\\ ?\" ?$ ?  ?\;))
+			     (concat "\\" (char-to-string char))
+			   (char-to-string char))))
+	     string ""))
+
+
+
+(provide 'tcl)
+
+;;; tcl.el ends here