diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index c01eac16c5b..437e0911570 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+1999-10-12  Gerd Moellmann  <gerd@gnu.org>
+
+	* ps-mode.el: New file.
+
+	* files.el (auto-mode-alist): Add ps-mode for .eps and .ps,
+	case insensitive.
+
 1999-10-12  Richard Sharman  <rsharman@pobox.com>
 
 	* sh-script.el: Added support for indenting existing scripts.
diff --git a/lisp/progmodes/ps-mode.el b/lisp/progmodes/ps-mode.el
new file mode 100644
index 00000000000..7d4081d903e
--- /dev/null
+++ b/lisp/progmodes/ps-mode.el
@@ -0,0 +1,1177 @@
+;;; ps-mode.el --- PostScript mode for GNU Emacs.
+
+;; Copyright (C) 1999 Free Software Foundation, Inc.
+
+;; Author:     Peter Kleiweg <kleiweg@let.rug.nl>
+;; Maintainer: Peter Kleiweg <kleiweg@let.rug.nl>
+;; Created:    20 Aug 1997
+;; Version:    1.1a, 11 Oct 1999
+;; Keywords:   PostScript, 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 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:
+
+
+;;; Code:
+
+(require 'easymenu)
+
+;; Define core `PostScript' group.
+(defgroup PostScript nil
+  "PostScript mode for Emacs."
+  :group 'languages)
+
+(defgroup PostScript-edit nil
+  "PostScript editing."
+  :prefix "ps-mode-"
+  :group 'PostScript)
+
+(defgroup PostScript-interaction nil
+  "PostScript interaction."
+  :prefix "ps-run-"
+  :group 'PostScript)
+
+;; User variables.
+
+(defcustom ps-mode-auto-indent t
+  "*Should we use autoindent?"
+  :group 'PostScript-edit
+  :type 'boolean)
+
+(defcustom ps-mode-tab 4
+  "*Number of spaces to use when indenting."
+  :group 'PostScript-edit
+  :type 'integer)
+
+(defcustom ps-mode-paper-size '(595 842)
+  "*Default paper size.
+
+When inserting an EPSF template these values are used
+to set the boundingbox to include the whole page.
+When the figure is finished these values should be replaced."
+  :group 'PostScript-edit
+  :type '(choice
+	  (const :tag "letter"       (612  792))
+	  (const :tag "legal"        (612 1008))
+	  (const :tag "a0" 	    (2380 3368))
+	  (const :tag "a1" 	    (1684 2380))
+	  (const :tag "a2" 	    (1190 1684))
+	  (const :tag "a3" 	     (842 1190))
+	  (const :tag "a4" 	     (595  842))
+	  (const :tag "a5" 	     (421  595))
+	  (const :tag "a6" 	     (297  421))
+	  (const :tag "a7" 	     (210  297))
+	  (const :tag "a8" 	     (148  210))
+	  (const :tag "a9" 	     (105  148))
+	  (const :tag "a10"           (74  105))
+	  (const :tag "b0" 	    (2836 4008))
+	  (const :tag "b1" 	    (2004 2836))
+	  (const :tag "b2" 	    (1418 2004))
+	  (const :tag "b3" 	    (1002 1418))
+	  (const :tag "b4" 	     (709 1002))
+	  (const :tag "b5" 	     (501  709))
+	  (const :tag "archE"       (2592 3456))
+	  (const :tag "archD"       (1728 2592))
+	  (const :tag "archC"       (1296 1728))
+	  (const :tag "archB"        (864 1296))
+	  (const :tag "archA"        (648  864))
+	  (const :tag "flsa"         (612  936))
+	  (const :tag "flse"         (612  936))
+	  (const :tag "halfletter"   (396  612))
+	  (const :tag "11x17"        (792 1224))
+	  (const :tag "tabloid"      (792 1224))
+	  (const :tag "ledger"      (1224  792))
+	  (const :tag "csheet"      (1224 1584))
+	  (const :tag "dsheet"      (1584 2448))
+	  (const :tag "esheet"      (2448 3168))))
+
+(defcustom ps-mode-print-function '(lambda ()
+				     (let ((lpr-switches nil)
+					   (lpr-command \"lpr\"))
+				       (lpr-buffer)))
+  "*Lisp function to print current buffer as PostScript."
+  :group 'PostScript-edit
+  :type 'function)
+
+(defcustom ps-run-prompt "\\(GS\\(<[0-9]+\\)?>\\)+"
+  "*Regexp to match prompt in interactive PostScript."
+  :group 'PostScript-interaction
+  :type 'regexp)
+
+(defcustom ps-run-messages
+  '((">>showpage, press <return> to continue<<"
+     (0 font-lock-keyword-face nil nil))
+    ("^\\(Error\\|Can't\\).*"
+     (0 font-lock-warning-face nil nil))
+    ("^\\(Current file position is\\) \\([0-9]+\\)" 
+     (1 font-lock-comment-face nil nil)
+     (2 font-lock-warning-face nil nil)))
+  "*Medium level highlighting of messages from the PostScript interpreter.
+
+See documentation on font-lock for details."
+  :group 'PostScript-interaction
+  :type '(repeat (list :tag "Expression with one or more highlighters"
+		       :value ("" (0 default nil t))
+		       (regexp :tag "Expression")
+		       (repeat :tag "Highlighters"
+			       :inline regexp
+			       (list :tag "Highlighter"
+				     (integer :tag "Subexp")
+				     face
+				     (boolean :tag "Override")
+				     (boolean :tag "Laxmatch" :value t))))))
+
+(defcustom ps-run-x '("gs" "-r72" "-sPAPERSIZE=a4")
+  "*Command as list to run PostScript with graphic display."
+  :group 'PostScript-interaction
+  :type '(repeat string))
+
+(defcustom ps-run-dumb '("gs" "-dNODISPLAY")
+  "*Command as list to run PostScript without graphic display."
+  :group 'PostScript-interaction
+  :type '(repeat string))
+
+(defcustom ps-run-init nil
+  "*String of commands to send to PostScript to start interactive.
+
+Example: \"executive\\n\"
+
+You won't need to set this option for Ghostscript.
+"
+  :group 'PostScript-interaction
+  :type '(choice (const nil) string))
+
+(defcustom ps-run-error-line-numbers nil
+  "*What values are used by the PostScript interpreter in error messages?"
+  :group 'PostScript-interaction
+  :type '(choice (const :tag "line numbers" t)
+                 (const :tag "byte counts" nil)))
+
+(defcustom ps-run-tmp-dir nil
+  "*Name of directory to place temporary file.
+
+If nil, the following are tried in turn, until success:
+  1. \"$TEMP\"
+  2. \"$TMP\"
+  3. \"$HOME/tmp\"
+  4. \"/tmp\"
+"
+  :group 'PostScript-interaction
+  :type '(choice (const nil) directory))
+
+
+;; Constants used for font-lock.
+
+;; Only a small set of the PostScript operators is selected for fontification.
+;; Fontification is meant to clarify the document structure and process flow,
+;; fontifying all known PostScript operators would hinder that objective.
+(defconst ps-mode-operators
+  (let ((ops '("clear" "mark" "cleartomark" "counttomark"
+	       "forall"
+	       "dict" "begin" "end" "def"
+	       "true" "false"
+	       "exec" "if" "ifelse" "for" "repeat" "loop" "exit"
+	       "stop" "stopped" "countexecstack" "execstack"
+	       "quit" "start"
+	       "save" "restore"
+	       "bind" "null"
+	       "gsave" "grestore" "grestoreall"
+	       "showpage")))
+    (concat "\\<" (regexp-opt ops t) "\\>"))
+  "Regexp of PostScript operators that will be fontified")
+
+;; Level 1 font-lock:
+;;  - Special comments (reference face)
+;;  - Strings and other comments
+;;  - Partial strings (warning face)
+;;  - 8bit characters (warning face)
+;; Multiline strings are not supported. Strings with nested brackets are.
+(defconst ps-mode-font-lock-keywords-1
+  '(("\\`%!PS.*" . font-lock-reference-face)
+    ("^%%BoundingBox:[ \t]+-?[0-9]+[ \t]+-?[0-9]+[ \t]+-?[0-9]+[ \t]+-?[0-9]+[ \t]*$" 
+     . font-lock-reference-face)
+    (ps-mode-match-string-or-comment
+     (1 font-lock-comment-face nil t)
+     (2 font-lock-string-face nil t))
+    ("([^()\n%]*\\|[^()\n]*)" . font-lock-warning-face)
+    ("[\200-\377]+" (0 font-lock-warning-face prepend nil)))
+  "Subdued level highlighting for PostScript mode.")
+
+;; Level 2 font-lock:
+;;  - All from level 1
+;;  - PostScript operators (keyword face)
+(defconst ps-mode-font-lock-keywords-2
+  (append
+   ps-mode-font-lock-keywords-1
+   (list
+    (cons
+     ;; exclude names prepended by `/'
+     (concat "\\(^\\|[^/\n]\\)" ps-mode-operators)
+     '(2 font-lock-keyword-face))))
+  "Medium level highlighting for PostScript mode.")
+
+;; Level 3 font-lock:
+;;  - All from level 2
+;;  - Immediately evaluated names: those starting with `//' (type face)
+;;  - Names that look like they are used for the definition of:
+;;     * a function
+;;     * an array
+;;     * a dictionary
+;;     * a "global" variable
+;;    (function name face)
+;;  - Other names (variable name face)
+;; The rules used to determine what names fit in the first category are:
+;;  - Only names that are at the left margin, and one of these on the same line:
+;;     * Nothing after the name except possibly one or more `[' or a comment
+;;     * A `{' or `<<' or `[0-9]+ dict' following the name
+;;     * A `def' somewhere in the same line
+;; Names are fontified before PostScript operators, allowing the use of
+;; a more simple (efficient) regexp than the one used in level 2.
+(defconst ps-mode-font-lock-keywords-3
+  (append
+   ps-mode-font-lock-keywords-1
+   (list
+    '("//\\w+" . font-lock-type-face)
+    '("^\\(/\\w+\\)\\>[[ \t]*\\(%.*\\)?\r?$" 
+      . (1 font-lock-function-name-face))
+    '("^\\(/\\w+\\)\\>\\([ \t]*{\\|[ \t]*<<\\|.*\\<def\\>\\|[ \t]+[0-9]+[ \t]+dict\\>\\)"
+      . (1 font-lock-function-name-face))
+    '("/\\w+" . font-lock-variable-name-face)
+    (cons ps-mode-operators 'font-lock-keyword-face)))
+  "High level highliting for PostScript mode.")
+
+(defconst ps-mode-font-lock-keywords ps-mode-font-lock-keywords-1
+  "Default expressions to highlight in PostScript mode.")
+
+;; Level 1 font-lock for ps-run-mode
+;;  - prompt (function name face)
+(defconst ps-run-font-lock-keywords-1
+  (unless (or (not (stringp ps-run-prompt)) (string= "" ps-run-prompt))
+    (list (cons (concat "^" ps-run-prompt) 'font-lock-function-name-face)))
+  "Subdued level highlighting for PostScript run mode.")
+
+(defconst ps-run-font-lock-keywords ps-run-font-lock-keywords-1
+  "Default expressions to highlight in PostScript run mode.")
+
+
+;; Variables.
+
+(defvar ps-mode-map nil
+  "Local keymap to use in PostScript mode.")
+
+(defvar ps-mode-syntax-table nil
+  "Syntax table used while in PostScript mode.")
+
+(defvar ps-run-mode-map nil
+  "Local keymap to use in PostScript run mode.")
+
+(defvar ps-mode-tmp-file nil
+  "Name of temporary file, set by `ps-run'.")
+
+(defvar ps-run-mark nil
+  "Mark to start of region that was sent to PostScript interpreter.")
+
+(defvar ps-run-parent nil
+  "Parent window of interactive PostScript.")
+
+
+;; Menu
+
+(defconst ps-mode-menu-main
+  '("PostScript"
+    ["EPSF Template, Sparse" ps-mode-epsf-sparse t]
+    ["EPSF Template, Rich"   ps-mode-epsf-rich t]
+    "---"
+    ("Cookbook"
+     ["RE" ps-mode-RE t]
+     ["ISOLatin1Extended" ps-mode-latin-extended t]
+     ["center" ps-mode-center t]
+     ["right" ps-mode-right t]
+     ["Heapsort" ps-mode-heapsort t])
+    ("Fonts (1)"
+     ["Times-Roman" (insert "/Times-Roman ") t]
+     ["Times-Bold" (insert "/Times-Bold ") t]
+     ["Times-Italic" (insert "/Times-Italic ") t]
+     ["Times-BoldItalic" (insert "/Times-BoldItalic ") t]
+     ["Helvetica" (insert "/Helvetica ") t]
+     ["Helvetica-Bold" (insert "/Helvetica-Bold ") t]
+     ["Helvetica-Oblique" (insert "/Helvetica-Oblique ") t]
+     ["Helvetica-BoldOblique" (insert "/Helvetica-BoldOblique ") t]
+     ["Courier" (insert "/Courier ") t]
+     ["Courier-Bold" (insert "/Courier-Bold ") t]
+     ["Courier-Oblique" (insert "/Courier-Oblique ") t]
+     ["Courier-BoldOblique" (insert "/Courier-BoldOblique ") t]
+     ["Symbol" (insert "/Symbol") t ])
+    ("Fonts (2)"
+     ["AvantGarde-Book" (insert "/AvantGarde-Book ") t]
+     ["AvantGarde-Demi" (insert "/AvantGarde-Demi ") t]
+     ["AvantGarde-BookOblique" (insert "/AvantGarde-BookOblique ") t]
+     ["AvantGarde-DemiOblique" (insert "/AvantGarde-DemiOblique ") t]
+     ["Bookman-Light" (insert "/Bookman-Light ") t]
+     ["Bookman-Demi" (insert "/Bookman-Demi ") t]
+     ["Bookman-LightItalic" (insert "/Bookman-LightItalic ") t]
+     ["Bookman-DemiItalic" (insert "/Bookman-DemiItalic ") t]
+     ["Helvetica-Narrow" (insert "/Helvetica-Narrow ") t]
+     ["Helvetica-Narrow-Bold" (insert "/Helvetica-Narrow-Bold ") t]
+     ["Helvetica-Narrow-Oblique" (insert "/Helvetica-Narrow-Oblique ") t]
+     ["Helvetica-Narrow-BoldOblique" (insert "/Helvetica-Narrow-BoldOblique ") t]
+     ["NewCenturySchlbk-Roman" (insert "/NewCenturySchlbk-Roman ") t]
+     ["NewCenturySchlbk-Bold" (insert "/NewCenturySchlbk-Bold ") t]
+     ["NewCenturySchlbk-Italic" (insert "/NewCenturySchlbk-Italic ") t]
+     ["NewCenturySchlbk-BoldItalic" (insert "/NewCenturySchlbk-BoldItalic ") t]
+     ["Palatino-Roman" (insert "/Palatino-Roman ") t]
+     ["Palatino-Bold" (insert "/Palatino-Bold ") t]
+     ["Palatino-Italic" (insert "/Palatino-Italic ") t]
+     ["Palatino-BoldItalic" (insert "/Palatino-BoldItalic ") t]
+     ["ZapfChancery-MediumItalic" (insert "/ZapfChancery-MediumItalic ") t]
+     ["ZapfDingbats" (insert "/ZapfDingbats ") t])
+    "---"
+    ["Comment Out Region" ps-mode-comment-out-region (mark t)]
+    ["Uncomment Region" ps-mode-uncomment-region (mark t)]
+    "---"
+    ["8-bit to Octal Buffer" ps-mode-octal-buffer t]
+    ["8-bit to Octal Region" ps-mode-octal-region (mark t)]
+    "---"
+    ("Auto Indent"
+     ["On" (setq ps-mode-auto-indent t) (not ps-mode-auto-indent)]
+     ["Off" (setq ps-mode-auto-indent nil) ps-mode-auto-indent])
+    "---"
+    ["Start PostScript"
+     ps-run-start
+     t]
+    ["Quit PostScript" ps-run-quit (process-status "ps-run")]
+    ["Kill PostScript" ps-run-kill (process-status "ps-run")]
+    ["Send Buffer to Interpreter"
+     ps-run-buffer
+     (process-status "ps-run")]
+    ["Send Region to Interpreter"
+     ps-run-region
+     (and (mark t) (process-status "ps-run"))]
+    ["Send Newline to Interpreter"
+     ps-mode-other-newline
+     (process-status "ps-run")]
+    ["View BoundingBox"
+     ps-run-boundingbox
+     (process-status "ps-run")]
+    ["Clear/Reset PostScript Graphics"
+     ps-run-clear
+     (process-status "ps-run")]
+    "---"
+    ["Print Buffer as PostScript"
+     ps-mode-print-buffer
+     t]
+    ["Print Region as PostScript"
+     ps-mode-print-region
+     (mark t)]
+    "---"
+    ["Customize for PostScript"
+     (customize-group "PostScript")
+     t]))
+
+
+;; Mode maps for PostScript edit mode and PostScript interaction mode.
+
+(unless ps-mode-map
+  (setq ps-mode-map (make-sparse-keymap))
+  (define-key ps-mode-map [return] 'ps-mode-newline)
+  (define-key ps-mode-map "\r" 'ps-mode-newline)
+  (define-key ps-mode-map "\t" 'ps-mode-tabkey)
+  (define-key ps-mode-map "\177" 'ps-mode-backward-delete-char)
+  (define-key ps-mode-map "}" 'ps-mode-r-brace)
+  (define-key ps-mode-map "]" 'ps-mode-r-angle)
+  (define-key ps-mode-map ">" 'ps-mode-r-gt)
+  (define-key ps-mode-map "\C-c\C-b" 'ps-run-buffer)
+  (define-key ps-mode-map "\C-c\C-c" 'ps-run-clear)
+  (define-key ps-mode-map "\C-c\C-j" 'ps-mode-other-newline)
+  (define-key ps-mode-map "\C-c\C-k" 'ps-run-kill)
+  (define-key ps-mode-map "\C-c\C-o" 'ps-mode-comment-out-region)
+  (define-key ps-mode-map "\C-c\C-p" 'ps-mode-print-buffer)
+  (define-key ps-mode-map "\C-c\C-q" 'ps-run-quit)
+  (define-key ps-mode-map "\C-c\C-r" 'ps-run-region)
+  (define-key ps-mode-map "\C-c\C-s" 'ps-run-start)
+  (define-key ps-mode-map "\C-c\C-t" 'ps-mode-epsf-rich)
+  (define-key ps-mode-map "\C-c\C-u" 'ps-mode-uncomment-region)
+  (define-key ps-mode-map "\C-c\C-v" 'ps-run-boundingbox)
+  (easy-menu-define ps-mode-main ps-mode-map "PostScript" ps-mode-menu-main))
+
+(unless ps-run-mode-map
+  (setq ps-run-mode-map (make-sparse-keymap))
+  (define-key ps-run-mode-map [return] 'ps-run-newline)
+  (define-key ps-run-mode-map "\r" 'ps-run-newline)
+  (define-key ps-run-mode-map "\C-c\C-q" 'ps-run-quit)
+  (define-key ps-run-mode-map "\C-c\C-k" 'ps-run-kill)
+  (define-key ps-run-mode-map "\C-c\C-e" 'ps-run-goto-error)
+  (define-key ps-run-mode-map [mouse-2] 'ps-run-mouse-goto-error))
+
+
+;; Syntax table.
+
+(unless ps-mode-syntax-table
+  (setq ps-mode-syntax-table (make-syntax-table))
+    
+  (modify-syntax-entry ?\% "< " ps-mode-syntax-table)
+  (modify-syntax-entry ?\n "> " ps-mode-syntax-table)
+  (modify-syntax-entry ?\r "> " ps-mode-syntax-table)
+  (modify-syntax-entry ?\f "> " ps-mode-syntax-table)
+  (modify-syntax-entry ?\< "(>" ps-mode-syntax-table)
+  (modify-syntax-entry ?\> ")<" ps-mode-syntax-table)
+    
+  (modify-syntax-entry ?\! "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\" "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\# "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\$ "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\& "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\' "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\* "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\+ "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\, "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\- "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\. "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\: "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\; "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\= "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\? "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\@ "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\\ "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?^  "w " ps-mode-syntax-table) ; NOT: ?\^
+  (modify-syntax-entry ?\_ "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\` "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\| "w " ps-mode-syntax-table)
+  (modify-syntax-entry ?\~ "w " ps-mode-syntax-table)
+    
+  (let ((i 128))
+    (while (< i 256)
+      (modify-syntax-entry i "w " ps-mode-syntax-table)
+      (setq i (1+ i)))))
+
+
+;; PostScript mode.
+
+;;;###autoload
+(defun ps-mode ()
+  "Major mode for editing PostScript with GNU Emacs.
+
+Entry to this mode calls `ps-mode-hook'.
+
+The following variables hold user options, and can
+be set through the `customize' command:
+
+  ps-mode-auto-indent
+  ps-mode-tab
+  ps-mode-paper-size
+  ps-mode-print-function
+  ps-run-tmp-dir
+  ps-run-prompt
+  ps-run-x
+  ps-run-dumb
+  ps-run-init
+  ps-run-error-line-numbers
+
+Type \\[describe-variable] for documentation on these options.
+
+
+\\{ps-mode-map}
+
+
+When starting an interactive PostScript process with \\[ps-run-start],
+a second window will be displayed, and `ps-run-mode-hook' will be called.
+The keymap for this second window is:
+
+\\{ps-run-mode-map}
+
+
+When Ghostscript encounters an error it displays an error message
+with a file position. Clicking mouse-2 on this number will bring
+point to the corresponding spot in the PostScript window, if input
+to the interpreter was sent from that window.
+Typing \\<ps-run-mode-map>\\[ps-run-goto-error] when the cursor is at the number has the same effect.
+"
+  (interactive)
+  (kill-all-local-variables)
+  (make-local-variable 'font-lock-defaults)
+  (setq font-lock-defaults '((ps-mode-font-lock-keywords
+                              ps-mode-font-lock-keywords-1
+                              ps-mode-font-lock-keywords-2
+                              ps-mode-font-lock-keywords-3)
+                             t)
+        major-mode 'ps-mode
+        mode-name  "PostScript")
+  (use-local-map ps-mode-map)
+  (set-syntax-table ps-mode-syntax-table)
+  (run-hooks 'ps-mode-hook))
+
+
+;; Helper functions for font-lock.
+
+;; When this function is called, point is at an opening bracket.
+;; This function should test if point is at the start of a string
+;; with nested brackets.
+;; If true:  move point to end of string
+;;           set string to match data nr 2
+;;           return new point
+;; If false: return nil
+(defun ps-mode-looking-at-nested (limit)
+  (let ((first (point))
+	(level 1)
+	pos)
+    ;; Move past opening bracket.
+    (forward-char 1)
+    (setq pos (point))
+    (while (and (> level 0) (< pos limit))
+      ;; Search next bracket, stepping over escaped brackets.
+      (if (not (looking-at "\\([^()\\\n]\\|\\\\.\\)*\\([()]\\)"))
+          (setq level -1)
+        (if (string= "(" (match-string 2))
+	    (setq level (1+ level))
+          (setq level (1- level)))
+        (goto-char (setq pos (match-end 0)))))
+    (if (not (= level 0))
+        nil
+      ;; Found string with nested brackets, now set match data nr 2.
+      (goto-char first)
+      (re-search-forward "\\(%\\)\\|\\((.*\\)" pos))))
+
+;; This function should search for a string or comment
+;; If comment, return as match data nr 1
+;; If string, return as match data nr 2
+(defun ps-mode-match-string-or-comment (limit)
+  ;; Find the first potential match.
+  (if (not (re-search-forward "[%(]" limit t))
+      ;; Nothing found: return failure.
+      nil
+    (let (end)
+      (goto-char (match-beginning 0))
+      (setq end (match-end 0))
+      (cond ((looking-at "\\(%.*\\)\\|\\((\\([^()\\\n]\\|\\\\.\\)*)\\)")
+	     ;; It's a comment or string without nested, unescaped brackets.
+	     (goto-char (match-end 0))
+	     (point))
+	    ((ps-mode-looking-at-nested limit)
+	     ;; It's a string with nested brackets.
+	     (point))
+	    (t
+	     ;; Try next match. 
+	     (goto-char end)
+	     (ps-mode-match-string-or-comment limit))))))
+
+
+;; Key-handlers.
+
+(defun ps-mode-target-column ()
+  "To what column should text on current line be indented?
+
+Identation is increased if the last token on the current line
+defines the beginning of a group. These tokens are:  {  [  <<"
+  (save-excursion
+    (beginning-of-line)
+    (if (looking-at "[ \t]*\\(}\\|\\]\\|>>\\)")
+	(condition-case err
+	    (progn
+	      (goto-char (match-end 0))
+	      (backward-sexp 1)
+	      (beginning-of-line)
+	      (if (looking-at "[ \t]+")
+		  (goto-char (match-end 0)))
+	      (current-column))
+	  (error
+	   (ding)
+	   (message (error-message-string err))
+	   0))
+      (let (target)
+	(if (not (re-search-backward "[^ \t\n\r\f][ \t\n\r\f]*\\=" nil t))
+	    0
+	  (goto-char (match-beginning 0))
+	  (beginning-of-line)
+	  (if (looking-at "[ \t]+")
+	      (goto-char (match-end 0)))
+	  (setq target (current-column))
+	  (end-of-line)
+	  (if (re-search-backward "\\({\\|\\[\\|<<\\)[ \t]*\\(%[^\n]*\\)?\\=" nil t)
+	      (setq target (+ target ps-mode-tab)))
+	  target)))))
+
+(defun ps-mode-newline ()
+  "Insert newline with proper indentation."
+  (interactive)
+  (delete-horizontal-space)
+  (insert "\n")
+  (if ps-mode-auto-indent
+      (indent-to (ps-mode-target-column))))
+
+(defun ps-mode-tabkey ()
+  "Indent/reindent current line, or insert tab"
+  (interactive)
+  (let ((column (current-column))
+	target)
+    (if (or (not ps-mode-auto-indent)
+	    (< ps-mode-tab 1)
+	    (not (re-search-backward "^[ \t]*\\=" nil t)))
+	(insert "\t")
+      (setq target (ps-mode-target-column))
+      (while (<= target column)
+	(setq target (+ target ps-mode-tab)))
+      (delete-horizontal-space)
+      (indent-to target))))
+
+(defun ps-mode-backward-delete-char ()
+  "Delete backward indentation, or delete backward character"
+  (interactive)
+  (let ((column (current-column))
+	target)
+    (if (or (not ps-mode-auto-indent)
+	    (< ps-mode-tab 1)
+	    (not (re-search-backward "^[ \t]+\\=" nil t)))
+	(delete-backward-char 1)
+      (setq target (ps-mode-target-column))
+      (while (> column target)
+	(setq target (+ target ps-mode-tab)))
+      (while (>= target column)
+	(setq target (- target ps-mode-tab)))
+      (if (< target 0)
+	  (setq target 0))
+      (delete-horizontal-space)
+      (indent-to target))))
+
+(defun ps-mode-r-brace ()
+  "Insert `}' and perform balance."
+  (interactive)
+  (insert "}")
+  (ps-mode-r-balance "}"))
+
+(defun ps-mode-r-angle ()
+  "Insert `]' and perform balance."
+  (interactive)
+  (insert "]")
+  (ps-mode-r-balance "]"))
+
+(defun ps-mode-r-gt ()
+  "Insert `>' and perform balance."
+  (interactive)
+  (insert ">")
+  (ps-mode-r-balance ">>"))
+
+(defun ps-mode-r-balance (right)
+  "Adjust indentification if point after RIGHT."
+  (if ps-mode-auto-indent
+      (save-excursion
+	(when (re-search-backward (concat "^[ \t]*" (regexp-quote right) "\\=") nil t)
+	  (delete-horizontal-space)
+	  (indent-to (ps-mode-target-column)))))
+  (blink-matching-open))
+
+(defun ps-mode-other-newline ()
+  "Perform newline in `*ps run*' buffer"
+  (interactive)
+  (let ((buf (current-buffer)))
+    (set-buffer "*ps run*")
+    (ps-run-newline)
+    (set-buffer buf)))
+
+
+;; Print PostScript.
+
+(defun ps-mode-print-buffer ()
+  "Print buffer as PostScript"
+  (interactive)
+  (eval (list ps-mode-print-function)))
+
+(defun ps-mode-print-region (begin end)
+  "Print region as PostScript, adding minimal header and footer lines:
+
+%!PS
+<region>
+showpage
+"
+  (interactive "r")
+  (let ((oldbuf (current-buffer))
+        (tmpbuf (get-buffer-create "*ps print*")))
+    (copy-to-buffer tmpbuf begin end)
+    (set-buffer tmpbuf)
+    (goto-char 1)
+    (insert "%!PS\n")
+    (goto-char (point-max))
+    (insert "\nshowpage\n")
+    (eval (list ps-mode-print-function))
+    (set-buffer oldbuf)
+    (kill-buffer tmpbuf)))
+
+
+;; Comment Out / Uncomment.
+
+(defun ps-mode-comment-out-region (begin end)
+  "Comment out region."
+  (interactive "r")
+  (let ((endm (make-marker)))
+    (set-marker endm end)
+    (save-excursion
+      (goto-char begin)
+      (if (= (current-column) 0)
+	  (insert "%"))
+      (while (and (= (forward-line) 0)
+		  (< (point) (marker-position endm)))
+	(insert "%")))
+    (set-marker endm nil)))
+
+(defun ps-mode-uncomment-region (begin end)
+  "Uncomment region.
+
+Only one `%' is removed, and it has to be in the first column."
+  (interactive "r")
+  (let ((endm (make-marker)))
+    (set-marker endm end)
+    (save-excursion
+      (goto-char begin)
+      (if (looking-at "^%")
+	  (delete-char 1))
+      (while (and (= (forward-line) 0)
+		  (< (point) (marker-position endm)))
+	(if (looking-at "%")
+	    (delete-char 1))))
+    (set-marker endm nil)))
+
+
+;; Convert 8-bit to octal codes.
+
+(defun ps-mode-octal-buffer ()
+  "Change 8-bit characters to octal codes in buffer."
+  (interactive)
+  (ps-mode-octal-region (point-min) (point-max)))
+
+(defun ps-mode-octal-region (begin end)
+  "Change 8-bit characters to octal codes in region."
+  (interactive "r")
+  (if buffer-read-only
+      (progn
+	(ding)
+	(message "Buffer is read only"))
+    (save-excursion
+      (let (endm i)
+        (setq endm (make-marker))
+        (set-marker endm end)
+        (goto-char begin)
+        (setq i 0)
+        (while (re-search-forward "[\200-\377]" (marker-position endm) t)
+          (setq i (1+ i))
+          (backward-char)
+          (insert (format "\\%03o" (string-to-char (buffer-substring (point) (1+ (point))))))
+          (delete-char 1))
+        (message (format "%d change%s made" i (if (= i 1) "" "s")))
+        (set-marker endm nil)))))
+
+
+;; Cookbook.
+
+(defun ps-mode-center ()
+  "Insert function /center."
+  (interactive)
+  (insert "
+/center {
+    dup stringwidth
+    exch 2 div neg
+    exch 2 div neg
+    rmoveto
+} bind def
+"))
+
+(defun ps-mode-right ()
+  "Insert function /right."
+  (interactive)
+  (insert "
+/right {
+    dup stringwidth
+    exch neg
+    exch neg
+    rmoveto
+} bind def
+"))
+
+(defun ps-mode-RE ()
+  "Insert function /RE."
+  (interactive)
+  (insert "
+% `new-font-name' `encoding-vector' `old-font-name' RE -
+/RE {
+    findfont
+    dup maxlength dict begin {
+        1 index /FID ne { def } { pop pop } ifelse
+    } forall
+    /Encoding exch def
+    dup /FontName exch def
+    currentdict end definefont pop
+} bind def
+"))
+
+(defun ps-mode-latin-extended ()
+  "Insert array /ISOLatin1Extended.
+
+This encoding vector contains all the entries from ISOLatin1Encoding
+plus the usually uncoded characters inserted on positions 1 through 28.
+"
+  (interactive)
+  (insert "
+% ISOLatin1Encoding, extended with remaining uncoded glyphs
+/ISOLatin1Extended [
+    /.notdef /Lslash /lslash /OE /oe /Scaron /scaron /Zcaron /zcaron
+    /Ydieresis /trademark /bullet /dagger /daggerdbl /ellipsis /emdash
+    /endash /fi /fl /florin /fraction /guilsinglleft /guilsinglright
+    /perthousand /quotedblbase /quotedblleft /quotedblright
+    /quotesinglbase /quotesingle /.notdef /.notdef /.notdef /space
+    /exclam /quotedbl /numbersign /dollar /percent /ampersand
+    /quoteright /parenleft /parenright /asterisk /plus /comma /minus
+    /period /slash /zero /one /two /three /four /five /six /seven /eight
+    /nine /colon /semicolon /less /equal /greater /question /at /A /B /C
+    /D /E /F /G /H /I /J /K /L /M /N /O /P /Q /R /S /T /U /V /W /X /Y /Z
+    /bracketleft /backslash /bracketright /asciicircum /underscore
+    /quoteleft /a /b /c /d /e /f /g /h /i /j /k /l /m /n /o /p /q /r /s
+    /t /u /v /w /x /y /z /braceleft /bar /braceright /asciitilde
+    /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
+    /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef /.notdef
+    /.notdef /.notdef /.notdef /dotlessi /grave /acute /circumflex
+    /tilde /macron /breve /dotaccent /dieresis /.notdef /ring /cedilla
+    /.notdef /hungarumlaut /ogonek /caron /space /exclamdown /cent
+    /sterling /currency /yen /brokenbar /section /dieresis /copyright
+    /ordfeminine /guillemotleft /logicalnot /hyphen /registered /macron
+    /degree /plusminus /twosuperior /threesuperior /acute /mu /paragraph
+    /periodcentered /cedilla /onesuperior /ordmasculine /guillemotright
+    /onequarter /onehalf /threequarters /questiondown /Agrave /Aacute
+    /Acircumflex /Atilde /Adieresis /Aring /AE /Ccedilla /Egrave /Eacute
+    /Ecircumflex /Edieresis /Igrave /Iacute /Icircumflex /Idieresis /Eth
+    /Ntilde /Ograve /Oacute /Ocircumflex /Otilde /Odieresis /multiply
+    /Oslash /Ugrave /Uacute /Ucircumflex /Udieresis /Yacute /Thorn
+    /germandbls /agrave /aacute /acircumflex /atilde /adieresis /aring
+    /ae /ccedilla /egrave /eacute /ecircumflex /edieresis /igrave
+    /iacute /icircumflex /idieresis /eth /ntilde /ograve /oacute
+    /ocircumflex /otilde /odieresis /divide /oslash /ugrave /uacute
+    /ucircumflex /udieresis /yacute /thorn /ydieresis
+] def
+"))
+
+(defun ps-mode-heapsort ()
+  "Insert function /Heapsort."
+  (interactive)
+  (insert "
+% `array-element' Heapsort-cvi-or-cvr-or-cvs `number-or-string'
+/Heapsort-cvi-or-cvr-or-cvs {
+    % 0 get
+} bind def
+% `array' Heapsort `sorted-array'
+/Heapsort {
+    dup length /hsR exch def
+    /hsL hsR 2 idiv 1 add def
+    {
+        hsR 2 lt { exit } if
+        hsL 1 gt {
+            /hsL hsL 1 sub def
+        } {
+            /hsR hsR 1 sub def
+            dup dup dup 0 get exch dup hsR get
+            0 exch put
+            hsR exch put
+        } ifelse
+        dup hsL 1 sub get /hsT exch def
+        /hsJ hsL def
+        {
+            /hsS hsJ def
+            /hsJ hsJ dup add def
+            hsJ hsR gt { exit } if
+            hsJ hsR lt {
+                dup dup hsJ 1 sub get Heapsort-cvi-or-cvr-or-cvs
+                exch hsJ get Heapsort-cvi-or-cvr-or-cvs
+                lt { /hsJ hsJ 1 add def } if
+            } if
+            dup hsJ 1 sub get Heapsort-cvi-or-cvr-or-cvs
+            hsT Heapsort-cvi-or-cvr-or-cvs
+            le { exit } if
+            dup dup hsS 1 sub exch hsJ 1 sub get put
+        } loop
+        dup hsS 1 sub hsT put
+    } loop
+} bind def
+"))
+
+
+;; EPSF document lay-out.
+
+(defun ps-mode-epsf-sparse ()
+  "Insert sparse EPSF template."
+  (interactive)
+  (goto-char (point-max))
+  (unless (re-search-backward "%%EOF[ \t\n]*\\'" nil t)
+    (goto-char (point-max))
+    (insert "\n%%EOF\n"))
+  (goto-char (point-max))
+  (unless (re-search-backward "\\bshowpage[ \t\n]+%%EOF[ \t\n]*\\'" nil t)
+    (re-search-backward "%%EOF")
+    (insert "showpage\n"))
+  (goto-char (point-max))
+  (unless (re-search-backward "\\bend[ \t\n]+\\bshowpage[ \t\n]+%%EOF[ \t\n]*\\'" nil t)
+    (re-search-backward "showpage")
+    (insert "\nend\n"))
+  (goto-char (point-min))
+  (insert "%!PS-Adobe-3.0 EPSF-3.0\n%%BoundingBox: 0 0 ")
+  (insert (format "%d %d\n\n"
+		  (car ps-mode-paper-size)
+		  (car (cdr ps-mode-paper-size))))
+  (insert "64 dict begin\n\n"))
+
+(defun ps-mode-epsf-rich ()
+  "Insert rich EPSF template."
+  (interactive)
+  (ps-mode-epsf-sparse)
+  (forward-line -3)
+  (when buffer-file-name
+    (insert "%%Title: " (file-name-nondirectory buffer-file-name) "\n"))
+  (insert "%%Creator: " (user-full-name) "\n")
+  (insert "%%CreationDate: " (current-time-string) "\n")
+  (insert "%%EndComments\n")
+  (forward-line 3))
+
+
+;; Interactive PostScript interpreter.
+
+(defun ps-run-mode ()
+  "Major mode in interactive PostScript window.
+This mode is invoked from ps-mode and should not be called directly.
+
+\\{ps-run-mode-map}
+"
+  (kill-all-local-variables)
+  (make-local-variable 'font-lock-defaults)
+  (setq font-lock-defaults (list (list 'ps-run-font-lock-keywords
+				       'ps-run-font-lock-keywords-1
+				       (append
+					ps-run-font-lock-keywords-1
+					ps-run-messages))
+				 t)
+	major-mode 'ps-run-mode
+	mode-name  "Interactive PS"
+	mode-line-process '(":%s"))
+  (use-local-map ps-run-mode-map)
+  (run-hooks 'ps-run-mode-hook))
+
+(defun ps-run-running ()
+  "Error if not in ps-mode or not running PostScript."
+  (unless (equal major-mode 'ps-mode)
+    (error "This function can only be called from PostScript mode"))
+  (unless (equal (process-status "ps-run") 'run)
+    (error "No PostScript process running")))
+
+(defun ps-run-start ()
+  "Start interactive PostScript."
+  (interactive)
+  (let ((command (if (and window-system ps-run-x) ps-run-x ps-run-dumb))
+	(init-file nil)
+	(process-connection-type nil)
+	(oldbuf (current-buffer))
+	(oldwin (selected-window))
+	i)
+    (unless command
+      (error "No command specified to run interactive PostScript"))
+    (unless (and ps-run-mark (markerp ps-run-mark))
+      (setq ps-run-mark (make-marker)))
+    (when ps-run-init
+      (setq init-file (ps-run-make-tmp-filename))
+      (write-region ps-run-init 0 init-file)
+      (setq init-file (list init-file)))
+    (pop-to-buffer "*ps run*")
+    (ps-run-mode)
+    (when (process-status "ps-run")
+      (delete-process "ps-run"))
+    (erase-buffer)
+    (setq i (append command init-file))
+    (while i
+      (insert (car i) (if (cdr i) " " "\n"))
+      (setq i (cdr i)))
+    (eval (append '(start-process "ps-run" "*ps run*") command init-file))
+    (select-window oldwin)))
+
+(defun ps-run-quit ()
+  "Quit interactive PostScript."
+  (interactive)
+  (ps-run-send-string "quit" t)
+  (ps-run-cleanup))
+
+(defun ps-run-kill ()
+  "Kill interactive PostScript."
+  (interactive)
+  (delete-process "ps-run")
+  (ps-run-cleanup))
+
+(defun ps-run-clear ()
+  "Clear/reset PostScript graphics."
+  (interactive)
+  (ps-run-send-string "showpage" t)
+  (sit-for 1)
+  (ps-run-send-string "" t))
+
+(defun ps-run-buffer ()
+  "Send buffer to PostScript interpreter."
+  (interactive)
+  (ps-run-region (point-min) (point-max)))
+
+(defun ps-run-region (begin end)
+  "Send region to PostScript interpreter."
+  (interactive "r")
+  (ps-run-running)
+  (setq ps-run-parent (buffer-name))
+  (let ((f (ps-run-make-tmp-filename)))
+    (set-marker ps-run-mark begin)
+    (write-region begin end f)
+    (ps-run-send-string (format "(%s) run" f) t)))
+
+(defun ps-run-boundingbox ()
+  "View BoundingBox"
+  (interactive)
+  (ps-run-running)
+  (let (x1 y1 x2 y2 f
+	   (buf (current-buffer)))
+    (save-excursion
+      (goto-char 1)
+      (re-search-forward
+       "^%%BoundingBox:[ \t]+\\(-?[0-9]+\\)[ \t]+\\(-?[0-9]+\\)[ \t]+\\(-?[0-9]+\\)[ \t]+\\(-?[0-9]+\\)")
+      (setq x1 (match-string 1)
+            y1 (match-string 2)
+            x2 (match-string 3)
+            y2 (match-string 4)))
+    (unless (< (string-to-number x1) (string-to-number x2))
+      (error "x1 (%s) should be less than x2 (%s)" x1 x2))
+    (unless (< (string-to-number y1) (string-to-number y2))
+      (error "y1 (%s) should be less than y2 (%s)" y1 y2))
+    (setq f (ps-run-make-tmp-filename))
+    (write-region
+     (format
+      "gsave
+    initgraphics
+    2 setlinewidth
+    %s %s moveto
+    %s %s lineto
+    %s %s lineto
+    %s %s lineto
+    closepath
+    gsave
+        [ 4 20 ] 0 setdash
+        1 0 0 setrgbcolor
+        stroke
+    grestore
+    gsave
+        [ 4 20 ] 8 setdash
+        0 1 0 setrgbcolor
+        stroke
+    grestore
+    [ 4 20 ] 16 setdash
+    0 0 1 setrgbcolor
+    stroke
+grestore
+" x1 y1 x2 y1 x2 y2 x1 y2)
+     0
+     f)
+    (ps-run-send-string (format "(%s) run" f) t)
+    (set-buffer buf)))
+
+(defun ps-run-send-string (string &optional echo)
+  (let ((oldwin (selected-window)))
+    (pop-to-buffer "*ps run*")
+    (goto-char (point-max))
+    (when echo
+      (insert string "\n"))
+    (set-marker (process-mark (get-process "ps-run")) (point))
+    (process-send-string "ps-run" (concat string "\n"))
+    (select-window oldwin)))
+
+(defun ps-run-make-tmp-filename ()
+  (unless ps-mode-tmp-file
+    (cond (ps-run-tmp-dir)
+	  ((setq ps-run-tmp-dir (getenv "TEMP")))
+	  ((setq ps-run-tmp-dir (getenv "TMP")))
+	  ((setq ps-run-tmp-dir (getenv "HOME"))
+	   (setq
+	    ps-run-tmp-dir
+	    (concat (file-name-as-directory ps-run-tmp-dir) "tmp"))
+	   (unless (file-directory-p ps-run-tmp-dir)
+	     (setq ps-run-tmp-dir nil))))
+    (unless ps-run-tmp-dir
+      (setq ps-run-tmp-dir "/tmp"))
+    (setq ps-mode-tmp-file
+	  (make-temp-name
+	   (concat
+	    (if ps-run-tmp-dir
+		(file-name-as-directory ps-run-tmp-dir)
+	      "")
+	    "ps-run-"))))
+  ps-mode-tmp-file)
+
+;; Remove temporary file
+;; This shouldn't fail twice, because it is called at kill-emacs
+(defun ps-run-cleanup ()
+  (when ps-mode-tmp-file
+    (let ((i ps-mode-tmp-file))
+      (setq ps-mode-tmp-file nil)
+      (when (file-exists-p i)
+	(delete-file i)))))
+
+(defun ps-run-mouse-goto-error (event)
+  "Set point at mouse click, then call ps-run-goto-error."
+  (interactive "e")
+  (mouse-set-point event)
+  (ps-run-goto-error))
+
+(defun ps-run-newline ()
+  "Process newline in PostScript interpreter window."
+  (interactive)
+  (end-of-line)
+  (insert "\n")
+  (forward-line -1)
+  (when (and (stringp ps-run-prompt) (looking-at ps-run-prompt))
+    (goto-char (match-end 0)))
+  (looking-at ".*")
+  (goto-char (1+ (match-end 0)))
+  (ps-run-send-string (buffer-substring (match-beginning 0) (match-end 0))))
+
+(defun ps-run-goto-error ()
+  "Jump to buffer position read as integer at point.
+Use line numbers if ps-run-error-line-numbers is not nil"
+  (interactive)
+  (let ((p (point)))
+    (unless (looking-at "[0-9]")
+      (goto-char (max 1 (1- (point)))))
+    (when (looking-at "[0-9]")
+      (forward-char 1)
+      (forward-word -1)
+      (when (looking-at "[0-9]+")
+	(let (i)
+	  (setq
+	   i
+	   (string-to-int
+	    (buffer-substring (match-beginning 0) (match-end 0))))
+	  (goto-char p)
+	  (pop-to-buffer ps-run-parent)
+	  (if ps-run-error-line-numbers
+	      (progn
+		(goto-char (marker-position ps-run-mark))
+		(forward-line (1- i))
+		(end-of-line))
+	    (goto-char (+ i (marker-position ps-run-mark)))))))))
+
+
+;;
+(add-hook 'kill-emacs-hook 'ps-run-cleanup)
+
+(provide 'ps-mode)
+
+;;; ps-mode.el ends here