(Fcommand_execute): New arg SPECIAL. All callers changed.

[emacs.git] / lisp / ps-print.el

;;; ps-print.el --- Jim's Pretty-Good PostScript Generator for Emacs 19.

;; Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.

;; Author: Jim Thompson <thompson@wg2.waii.com>
;; Keywords: print, PostScript

;; 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.

;; LCD Archive Entry:
;; ps-print|James C. Thompson|thompson@wg2.waii.com|
;; Jim's Pretty-Good PostScript Generator for Emacs 19 (ps-print)|
;; 26-Feb-1994|2.8|~/packages/ps-print.el|

;; Baseline-version: 2.8.  (Jim's last change version -- this
;; file may have been edited as part of Emacs without changes to the
;; version number.  When reporting bugs, please also report the
;; version of Emacs, if any, that ps-print was distributed with.)

;;; Commentary:

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; About ps-print
;; --------------
;; This package provides printing of Emacs buffers on PostScript
;; printers; the buffer's bold and italic text attributes are
;; preserved in the printer output.  Ps-print is intended for use with
;; Emacs 19 or Lucid Emacs, together with a fontifying package such as
;; font-lock or hilit.
;;
;; Using ps-print
;; --------------
;;
;; The Commands
;;
;; Ps-print provides eight commands for generating PostScript images
;; of Emacs buffers:
;;
;;        ps-print-buffer
;;        ps-print-buffer-with-faces
;;        ps-print-region
;;        ps-print-region-with-faces
;;        ps-spool-buffer
;;        ps-spool-buffer-with-faces
;;        ps-spool-region
;;        ps-spool-region-with-faces
;;
;; These commands all perform essentially the same function: they
;; generate PostScript images suitable for printing on a PostScript
;; printer or displaying with GhostScript.  These commands are
;; collectively referred to as "ps-print- commands".
;;
;; The word "print" or "spool" in the command name determines when the
;; PostScript image is sent to the printer:
;;
;;        print      - The PostScript image is immediately sent to the
;;                     printer;
;;
;;        spool      - The PostScript image is saved temporarily in an
;;                     Emacs buffer.  Many images may be spooled locally
;;                     before printing them.  To send the spooled images
;;                     to the printer, use the command ps-despool.
;;
;; The spooling mechanism was designed for printing lots of small
;; files (mail messages or netnews articles) to save paper that would
;; otherwise be wasted on banner pages, and to make it easier to find
;; your output at the printer (it's easier to pick up one 50-page
;; printout than to find 50 single-page printouts).
;; 
;; Ps-print has a hook in the kill-emacs-hooks so that you won't
;; accidentally quit from Emacs while you have unprinted PostScript
;; waiting in the spool buffer.  If you do attempt to exit with
;; spooled PostScript, you'll be asked if you want to print it, and if
;; you decline, you'll be asked to confirm the exit; this is modeled
;; on the confirmation that Emacs uses for modified buffers.
;;
;; The word "buffer" or "region" in the command name determines how
;; much of the buffer is printed:
;;
;;        buffer     - Print the entire buffer.
;;
;;        region     - Print just the current region.
;;
;; The -with-faces suffix on the command name means that the command
;; will include font, color, and underline information in the
;; PostScript image, so the printed image can look as pretty as the
;; buffer.  The ps-print- commands without the -with-faces suffix
;; don't include font, color, or underline information; images printed
;; with these commands aren't as pretty, but are faster to generate.
;;
;; Two ps-print- command examples:
;;
;;        ps-print-buffer             - print the entire buffer,
;;                                      without font, color, or
;;                                      underline information, and
;;                                      send it immediately to the
;;                                      printer.
;;
;;        ps-spool-region-with-faces  - print just the current region;
;;                                      include font, color, and
;;                                      underline information, and
;;                                      spool the image in Emacs to
;;                                      send to the printer later.
;;
;;
;; Invoking Ps-Print
;;
;; To print your buffer, type
;;
;;        M-x ps-print-buffer
;;
;; or substitute one of the other seven ps-print- commands.  The
;; command will generate the PostScript image and print or spool it as
;; specified.  By giving the command a prefix argument
;;
;;        C-u M-x ps-print-buffer
;;
;; it will save the PostScript image to a file instead of sending it
;; to the printer; you will be prompted for the name of the file to
;; save the image to.  The prefix argument is ignored by the commands
;; that spool their images, but you may save the spooled images to a
;; file by giving a prefix argument to ps-despool:
;;
;;        C-u M-x ps-despool
;;
;; When invoked this way, ps-despool will prompt you for the name of
;; the file to save to.
;;
;; Any of the ps-print- commands can be bound to keys; I recommend
;; binding ps-spool-buffer-with-faces, ps-spool-region-with-faces, and
;; ps-despool.  Here are the bindings I use on my Sun 4 keyboard:
;;
;;   (global-set-key 'f22 'ps-spool-buffer-with-faces) ;f22 is prsc
;;   (global-set-key '(shift f22) 'ps-spool-region-with-faces)
;;   (global-set-key '(control f22) 'ps-despool)
;;
;;
;; The Printer Interface
;;
;; The variables ps-lpr-command and ps-lpr-switches determine what
;; command is used to send the PostScript images to the printer, and
;; what arguments to give the command.  These are analogous to lpr-
;; command and lpr-switches.
;;
;; NOTE: ps-lpr-command and ps-lpr-switches take their initial values
;;       from the variables lpr-command and lpr-switches.  If you have
;;       lpr-command set to invoke a pretty-printer such as enscript,
;;       then ps-print won't work properly.  ps-lpr-command must name
;;       a program that does not format the files it prints.
;;
;;
;; How Ps-Print Deals With Fonts
;;
;; The ps-print-*-with-faces commands attempt to determine which faces
;; should be printed in bold or italic, but their guesses aren't
;; always right.  For example, you might want to map colors into faces
;; so that blue faces print in bold, and red faces in italic.
;;
;; It is possible to force ps-print to consider specific faces bold or
;; italic, no matter what font they are displayed in, by setting the
;; variables ps-bold-faces and ps-italic-faces.  These variables
;; contain lists of faces that ps-print should consider bold or
;; italic; to set them, put code like the following into your .emacs
;; file:
;;
;;      (setq ps-bold-faces '(my-blue-face))
;;      (setq ps-italic-faces '(my-red-face))
;;
;; Faces like bold-italic that are both bold and italic should go in
;; *both* lists.
;;
;; Ps-print does not attempt to guess the sizes of fonts; all text is
;; rendered using the Courier font family, in 10 point size.  To
;; change the font family, change the variables ps-font, ps-font-bold,
;; ps-font-italic, and ps-font-bold-italic; fixed-pitch fonts work
;; best, but are not required.  To change the font size, change the
;; variable ps-font-size.
;;
;; If you change the font family or size, you MUST also change the
;; variables ps-line-height, ps-avg-char-width, and ps-space-width, or
;; ps-print cannot correctly place line and page breaks.
;;
;; Ps-print keeps internal lists of which fonts are bold and which are
;; italic; these lists are built the first time you invoke ps-print.
;; For the sake of efficiency, the lists are built only once; the same
;; lists are referred in later invocations of ps-print.
;;
;; Because these lists are built only once, it's possible for them to
;; get out of sync, if a face changes, or if new faces are added.  To
;; get the lists back in sync, you can set the variable
;; ps-build-face-reference to t, and the lists will be rebuilt the
;; next time ps-print is invoked.
;;
;;
;; How Ps-Print Deals With Color
;;
;; Ps-print detects faces with foreground and background colors
;; defined and embeds color information in the PostScript image.  The
;; default foreground and background colors are defined by the
;; variables ps-default-fg and ps-default-bg.  On black-and-white
;; printers, colors are displayed in grayscale.  To turn off color
;; output, set ps-print-color-p to nil.
;;
;;
;; Headers
;;
;; Ps-print can print headers at the top of each page; the default
;; headers contain the following four items: on the left, the name of
;; the buffer and, if the buffer is visiting a file, the file's
;; directory; on the right, the page number and date of printing.  The
;; default headers look something like this:
;;
;;     ps-print.el                                         1/21
;;     /home/jct/emacs-lisp/ps/new                     94/12/31
;; 
;; When printing on duplex printers, left and right are reversed so
;; that the page numbers are toward the outside.
;;
;; Headers are configurable.  To turn them off completely, set
;; ps-print-header to nil.  To turn off the header's gaudy framing
;; box, set ps-print-header-frame to nil.  Page numbers are printed in
;; "n/m" format, indicating page n of m pages; to omit the total page
;; count and just print the page number, set ps-show-n-of-n to nil.
;;
;; The amount of information in the header can be changed by changing
;; the number of lines.  To show less, set ps-header-lines to 1, and
;; the header will show only the buffer name and page number.  To show
;; more, set ps-header-lines to 3, and the header will show the time of
;; printing below the date.
;;
;; To change the content of the headers, change the variables
;; ps-left-header and ps-right-header.  These variables are lists,
;; specifying top-to-bottom the text to display on the left or right
;; side of the header.  Each element of the list should be a string or
;; a symbol.  Strings are inserted directly into the PostScript
;; arrays, and should contain the PostScript string delimiters '(' and
;; ')'.
;;
;; Symbols in the header format lists can either represent functions
;; or variables.  Functions are called, and should return a string to
;; show in the header.  Variables should contain strings to display in
;; the header.  In either case, function or variable, the PostScript
;; string delimiters are added by ps-print, and should not be part of
;; the returned value.
;;
;; Here's an example: say we want the left header to display the text
;;
;;     Moe
;;     Larry
;;     Curly
;;
;; where we have a function to return "Moe"
;;
;;     (defun moe-func ()
;;       "Moe")
;;
;; a variable specifying "Larry"
;;
;;     (setq larry-var "Larry")
;;
;; and a literal for "Curly".  Here's how ps-left-header should be
;; set:
;;
;;     (setq ps-left-header (list 'moe-func 'larry-var "(Curly)"))
;;
;; Note that Curly has the PostScript string delimiters inside his
;; quotes -- those aren't misplaced lisp delimiters!  Without them,
;; PostScript would attempt to call the undefined function Curly,
;; which would result in a PostScript error.  Since most printers
;; don't report PostScript errors except by aborting the print job,
;; this kind of error can be hard to track down.  Consider yourself
;; warned.
;;
;;
;; Duplex Printers
;;
;; If you have a duplex-capable printer (one that prints both sides of
;; the paper), set ps-spool-duplex to t.  Ps-print will insert blank
;; pages to make sure each buffer starts on the correct side of the
;; paper.  Don't forget to set ps-lpr-switches to select duplex
;; printing for your printer.
;; 
;;
;; Paper Size
;;
;; The variable ps-paper-type determines the size of paper ps-print
;; formats for; it should contain one of the symbols ps-letter,
;; ps-legal, or ps-a4.  The default is ps-letter.
;;
;;
;; Make sure that the variables ps-lpr-command and ps-lpr-switches
;; contain appropriate values for your system; see the usage notes
;; below and the documentation of these variables.
;;
;; 
;; New since version 1.5
;; ---------------------
;; Color output capability.
;;
;; Automatic detection of font attributes (bold, italic).
;;
;; Configurable headers with page numbers.
;;
;; Slightly faster.
;;
;; Support for different paper sizes.
;;
;; Better conformance to PostScript Document Structure Conventions.
;;
;;
;; Known bugs and limitations of ps-print:
;; --------------------------------------
;; Although color printing will work in XEmacs 19.12, it doesn't work
;; well; in particular, bold or italic fonts don't print in the right
;; background color.
;;
;; Invisible properties aren't correctly ignored in XEmacs 19.12.
;;
;; Automatic font-attribute detection doesn't work well, especially
;; with hilit19 and older versions of get-create-face.  Users having
;; problems with auto-font detection should use the lists ps-italic-
;; faces and ps-bold-faces and/or turn off automatic detection by
;; setting ps-auto-font-detect to nil.
;;
;; Automatic font-attribute detection doesn't work with XEmacs 19.12
;; in tty mode; use the lists ps-italic-faces and ps-bold-faces
;; instead.
;;
;; Still too slow; could use some hand-optimization.
;;
;; ASCII Control characters other than tab, linefeed and pagefeed are
;; not handled.
;;
;; Default background color isn't working.
;;
;; Faces are always treated as opaque.
;;
;; Epoch and Emacs 18 not supported.  At all.
;;
;;
;; Features to add:
;; ---------------
;; 2-up and 4-up capability.
;;
;; Line numbers.
;;
;; Wide-print (landscape) capability.
;;
;;
;; Acknowledgements
;; ----------------
;; Thanks to Kevin Rodgers <kevinr@ihs.com> for adding support for
;; color and the invisible property.
;;
;; Thanks to Avishai Yacobi, avishaiy@mcil.comm.mot.com, for writing
;; the initial port to Emacs 19.  His code is no longer part of
;; ps-print, but his work is still appreciated.
;;
;; Thanks to Remi Houdaille and Michel Train, michel@metasoft.fdn.org,
;; for adding underline support.  Their code also is no longer part of
;; ps-print, but their efforts are not forgotten.
;;
;; Thanks also to all of you who mailed code to add features to
;; ps-print; although I didn't use your code, I still appreciate your
;; sharing it with me.
;;
;; Thanks to all who mailed comments, encouragement, and criticism.
;; Thanks also to all who responded to my survey; I had too many
;; responses to reply to them all, but I greatly appreciate your
;; interest.
;;
;; Jim
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;;; Code:

(defconst ps-print-version "2.8"
  "ps-print.el,v 2.8 1995/05/04 12:06:10 jct Exp

Jim's last change version -- this file may have been edited as part of
Emacs without changes to the version number.  When reporting bugs,
please also report the version of Emacs, if any, that ps-print was
distributed with.

Please send all bug fixes and enhancements to
        Jim Thompson <thompson@wg2.waii.com>.")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User Variables:

(defvar ps-lpr-command lpr-command
  "*The shell command for printing a PostScript file.")

(defvar ps-lpr-switches lpr-switches
  "*A list of extra switches to pass to `ps-lpr-command'.")

(defvar ps-spool-duplex nil             ; Not many people have duplex
                                        ; printers, so default to nil.
  "*Non-nil indicates spooling is for a two-sided printer.
For a duplex printer, the `ps-spool-*' commands will insert blank pages
as needed between print jobs so that the next buffer printed will
start on the right page.  Also, if headers are turned on, the headers
will be reversed on duplex printers so that the page numbers fall to
the left on even-numbered pages.")

(defvar ps-paper-type 'ps-letter
  "*Specifies the size of paper to format for.  Should be one of
`ps-letter', `ps-legal', or `ps-a4'.")

(defvar ps-print-header t
  "*Non-nil means print a header at the top of each page.
By default, the header displays the buffer name, page number, and, if
the buffer is visiting a file, the file's directory.  Headers are
customizable by changing variables `ps-header-left' and
`ps-header-right'.")

(defvar ps-print-header-frame t
  "*Non-nil means draw a gaudy frame around the header.")

(defvar ps-show-n-of-n t
  "*Non-nil means show page numbers as N/M, meaning page N of M.
Note: page numbers are displayed as part of headers, see variable
`ps-print-headers'.")

(defvar ps-print-color-p (and (or (fboundp 'x-color-values)   ; Emacs
                                (fboundp 'pixel-components))  ; XEmacs
                              (fboundp 'float))
; Printing color requires both floating point and x-color-values.
  "*If non-nil, print the buffer's text in color.")

(defvar ps-default-fg '(0.0 0.0 0.0)
  "*RGB values of the default foreground color.  Defaults to black.")

(defvar ps-default-bg '(1.0 1.0 1.0)
  "*RGB values of the default background color.  Defaults to white.")

(defvar ps-font-size 10
  "*Font size, in points, for generating Postscript.")

(defvar ps-font "Courier"
  "*Font family name for ordinary text, when generating Postscript.")

(defvar ps-font-bold "Courier-Bold"
  "*Font family name for bold text, when generating Postscript.")

(defvar ps-font-italic "Courier-Oblique"
  "*Font family name for italic text, when generating Postscript.")

(defvar ps-font-bold-italic "Courier-BoldOblique"
  "*Font family name for bold italic text, when generating Postscript.")

(defvar ps-avg-char-width (if (fboundp 'float) 5.6 6)
  "*The average width, in points, of a character, for generating Postscript.
This is the value that ps-print uses to determine the length,
x-dimension, of the text it has printed, and thus affects the point at
which long lines wrap around.  If you change the font or
font size, you will probably have to adjust this value to match.")

(defvar ps-space-width (if (fboundp 'float) 5.6 6)
  "*The width of a space character, for generating Postscript.
This value is used in expanding tab characters.")

(defvar ps-line-height (if (fboundp 'float) 11.29 11)
  "*The height of a line, for generating Postscript.
This is the value that ps-print uses to determine the height,
y-dimension, of the lines of text it has printed, and thus affects the
point at which page-breaks are placed.  If you change the font or font
size, you will probably have to adjust this value to match.  The
line-height is *not* the same as the point size of the font.")

(defvar ps-auto-font-detect t
  "*Non-nil means automatically detect bold/italic face attributes.
nil means rely solely on the lists `ps-bold-faces', `ps-italic-faces',
and `ps-underlined-faces'.")

(defvar ps-bold-faces '()
  "*A list of the \(non-bold\) faces that should be printed in bold font.
This applies to generating Postscript.")

(defvar ps-italic-faces '()
  "*A list of the \(non-italic\) faces that should be printed in italic font.
This applies to generating Postscript.")

(defvar ps-underlined-faces '()
  "*A list of the \(non-underlined\) faces that should be printed underlined.
This applies to generating Postscript.")

(defvar ps-header-lines 2
  "*Number of lines to display in page header, when generating Postscript.")
(make-variable-buffer-local 'ps-header-lines)

(defvar ps-left-header
  (list 'ps-get-buffer-name 'ps-header-dirpart)
  "*The items to display on the right part of the page header.
This applies to generating Postscript.

The value should be a list of strings and symbols, each representing an
entry in the PostScript array HeaderLinesLeft.

Strings are inserted unchanged into the array; those representing
PostScript string literals should be delimited with PostScript string
delimiters '(' and ')'.

For symbols with bound functions, the function is called and should
return a string to be inserted into the array.  For symbols with bound
values, the value should be a string to be inserted into the array.
In either case, function or variable, the string value has PostScript
string delimiters added to it.")
(make-variable-buffer-local 'ps-left-header)

(defvar ps-right-header
  (list "/pagenumberstring load" 'time-stamp-yy/mm/dd 'time-stamp-hh:mm:ss)
  "*The items to display on the left part of the page header.
This applies to generating Postscript.

See the variable `ps-left-header' for a description of the format of
this variable.")
(make-variable-buffer-local 'ps-right-header)

(defvar ps-razzle-dazzle t
  "*Non-nil means report progress while formatting buffer.")

(defvar ps-adobe-tag "%!PS-Adobe-1.0\n"
  "*Contains the header line identifying the output as PostScript.
By default, `ps-adobe-tag' contains the standard identifier.  Some
printers require slightly different versions of this line.")

(defvar ps-build-face-reference t
  "*Non-nil means build the reference face lists.

Ps-print sets this value to nil after it builds its internal reference
lists of bold and italic faces.  By settings its value back to t, you
can force ps-print to rebuild the lists the next time you invoke one
of the ...-with-faces commands.

You should set this value back to t after you change the attributes of
any face, or create new faces.  Most users shouldn't have to worry
about its setting, though.")

(defvar ps-always-build-face-reference nil
  "*Non-nil means always rebuild the reference face lists.

If this variable is non-nil, ps-print will rebuild its internal
reference lists of bold and italic faces *every* time one of the
-with-faces commands is called.  Most users shouldn't need to set this
variable.")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; User commands

;;;###autoload
(defun ps-print-buffer (&optional filename)
  "Generate and print a PostScript image of the buffer.

When called with a numeric prefix argument (C-u), prompts the user for
the name of a file to save the PostScript image in, instead of sending
it to the printer.

More specifically, the FILENAME argument is treated as follows: if it
is nil, send the image to the printer.  If FILENAME is a string, save
the PostScript image in a file with that name.  If FILENAME is a
number, prompt the user for the name of the file to save in."

  (interactive (list (ps-print-preprint current-prefix-arg)))
  (ps-generate (current-buffer) (point-min) (point-max)
               'ps-generate-postscript)
  (ps-do-despool filename))


;;;###autoload
(defun ps-print-buffer-with-faces (&optional filename)
  "Generate and print a PostScript image of the buffer.
Like `ps-print-buffer', but includes font, color, and underline
information in the generated image.  This command works only if you
are using a window system, so it has a way to determine color values."
  (interactive (list (ps-print-preprint current-prefix-arg)))
  (ps-generate (current-buffer) (point-min) (point-max)
               'ps-generate-postscript-with-faces)
  (ps-do-despool filename))


;;;###autoload
(defun ps-print-region (from to &optional filename)
  "Generate and print a PostScript image of the region.
Like `ps-print-buffer', but prints just the current region."

  (interactive (list (point) (mark) (ps-print-preprint current-prefix-arg)))
  (ps-generate (current-buffer) from to
               'ps-generate-postscript)
  (ps-do-despool filename))


;;;###autoload
(defun ps-print-region-with-faces (from to &optional filename)
  "Generate and print a PostScript image of the region.
Like `ps-print-region', but includes font, color, and underline
information in the generated image.  This command works only if you
are using a window system, so it has a way to determine color values."

  (interactive (list (point) (mark) (ps-print-preprint current-prefix-arg)))
  (ps-generate (current-buffer) from to
               'ps-generate-postscript-with-faces)
  (ps-do-despool filename))


;;;###autoload
(defun ps-spool-buffer ()
  "Generate and spool a PostScript image of the buffer.
Like `ps-print-buffer' except that the PostScript image is saved in a
local buffer to be sent to the printer later.

Use the command `ps-despool' to send the spooled images to the printer."
  (interactive)
  (ps-generate (current-buffer) (point-min) (point-max)
               'ps-generate-postscript))


;;;###autoload
(defun ps-spool-buffer-with-faces ()
  "Generate and spool a PostScript image of the buffer.
Like `ps-spool-buffer', but includes font, color, and underline
information in the generated image.  This command works only if you
are using a window system, so it has a way to determine color values.

Use the command `ps-despool' to send the spooled images to the printer."

  (interactive)
  (ps-generate (current-buffer) (point-min) (point-max)
               'ps-generate-postscript-with-faces))


;;;###autoload
(defun ps-spool-region (from to)
  "Generate a PostScript image of the region and spool locally.
Like `ps-spool-buffer', but spools just the current region.

Use the command `ps-despool' to send the spooled images to the printer."
  (interactive "r")
  (ps-generate (current-buffer) from to
               'ps-generate-postscript))


;;;###autoload
(defun ps-spool-region-with-faces (from to)
  "Generate a PostScript image of the region and spool locally.
Like `ps-spool-region', but includes font, color, and underline
information in the generated image.  This command works only if you
are using a window system, so it has a way to determine color values.

Use the command `ps-despool' to send the spooled images to the printer."
  (interactive "r")
  (ps-generate (current-buffer) from to
               'ps-generate-postscript-with-faces))

;;;###autoload
(defun ps-despool (&optional filename)
  "Send the spooled PostScript to the printer.

When called with a numeric prefix argument (C-u), prompt the user for
the name of a file to save the spooled PostScript in, instead of sending
it to the printer.

More specifically, the FILENAME argument is treated as follows: if it
is nil, send the image to the printer.  If FILENAME is a string, save
the PostScript image in a file with that name.  If FILENAME is a
number, prompt the user for the name of the file to save in."
  (interactive (list (ps-print-preprint current-prefix-arg)))
  (ps-do-despool filename))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Utility functions and variables:

(defvar ps-print-emacs-type
  (cond ((string-match "XEmacs" emacs-version) 'xemacs)
        ((string-match "Lucid" emacs-version) 'lucid)
        ((string-match "Epoch" emacs-version) 'epoch)
        (t 'emacs)))

(if (or (eq ps-print-emacs-type 'lucid)
        (eq ps-print-emacs-type 'xemacs))
    (if (< emacs-minor-version 12)
        (setq ps-print-color-p nil))
  (require 'faces))                     ; face-font, face-underline-p,
                                        ; x-font-regexp

(require 'time-stamp)

(defvar ps-print-prologue "% ISOLatin1Encoding stolen from ps_init.ps in GhostScript 2.6.1.4:
% If the ISOLatin1Encoding vector isn't known, define it.
/ISOLatin1Encoding where { pop } {
% Define the ISO Latin-1 encoding vector.
% The first half is the same as the standard encoding,
% except for minus instead of hyphen at code 055.
/ISOLatin1Encoding
StandardEncoding 0 45 getinterval aload pop
    /minus
StandardEncoding 46 82 getinterval aload pop
%*** NOTE: the following are missing in the Adobe documentation,
%*** but appear in the displayed table:
%*** macron at 0225, dieresis at 0230, cedilla at 0233, space at 0240.
% \20x
    /.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
% \24x
    /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
% \30x
    /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
% \34x
    /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
256 packedarray def
} ifelse

/reencodeFontISO { %def
  dup
  length 5 add dict                     % Make a new font (a new dict
                                        % the same size as the old
                                        % one) with room for our new
                                        % symbols.

  begin                                 % Make the new font the
                                        % current dictionary.


    { 1 index /FID ne
      { def } { pop pop } ifelse
    } forall                            % Copy each of the symbols
                                        % from the old dictionary to
                                        % the new except for the font
                                        % ID.

    /Encoding ISOLatin1Encoding def     % Override the encoding with
                                        % the ISOLatin1 encoding.

    % Use the font's bounding box to determine the ascent, descent,
    % and overall height; don't forget that these values have to be
    % transformed using the font's matrix.
    FontBBox
    FontMatrix transform /Ascent exch def pop
    FontMatrix transform /Descent exch def pop
    /FontHeight Ascent Descent sub def

    % Define these in case they're not in the FontInfo (also, here
    % they're easier to get to.
    /UnderlinePosition 1 def
    /UnderlineThickness 1 def

    % Get the underline position and thickness if they're defined.
    currentdict /FontInfo known {
      FontInfo

      dup /UnderlinePosition known {
        dup /UnderlinePosition get
        0 exch FontMatrix transform exch pop
        /UnderlinePosition exch def
      } if

      dup /UnderlineThickness known {
        /UnderlineThickness get
        0 exch FontMatrix transform exch pop
        /UnderlineThickness exch def
      } if

    } if

    currentdict                         % Leave the new font on the
                                        % stack

    end                                 % Stop using the font as the
                                        % current dictionary.

    definefont                          % Put the font into the font
                                        % dictionary

    pop                                 % Discard the returned font.
} bind def

/Font {
  findfont exch scalefont reencodeFontISO
} def

/F {                                    % Font select
  findfont
  dup /Ascent get /Ascent exch def
  dup /Descent get /Descent exch def
  dup /FontHeight get /FontHeight exch def
  dup /UnderlinePosition get /UnderlinePosition exch def
  dup /UnderlineThickness get /UnderlineThickness exch def
  setfont
} def

/FG /setrgbcolor load def

/bg false def
/BG {
  dup /bg exch def
  { mark 4 1 roll ] /bgcolor exch def } if
} def

/dobackground {                         % width --
  currentpoint
  gsave
    newpath
    moveto
    0 Ascent rmoveto
    dup 0 rlineto
    0 Descent Ascent sub rlineto
    neg 0 rlineto
    closepath
    bgcolor aload pop setrgbcolor
    fill
  grestore
} def

/dobackgroundstring {                   % string --
  stringwidth pop
  dobackground
} def

/dounderline {                          % fromx fromy --
  currentpoint
  gsave
    UnderlineThickness setlinewidth
    4 2 roll
    UnderlinePosition add moveto
    UnderlinePosition add lineto
    stroke
  grestore
} def

/eolbg {
  currentpoint pop
  PrintWidth LeftMargin add exch sub dobackground
} def

/eolul {
  currentpoint exch pop
  PrintWidth LeftMargin add exch dounderline
} def

/SL {                                   % Soft Linefeed
  bg { eolbg } if
  ul { eolul } if
  currentpoint LineHeight sub LeftMargin exch moveto pop
} def

/HL /SL load def                        % Hard Linefeed

/sp1 { currentpoint 3 -1 roll } def

% Some debug
/dcp { currentpoint exch 40 string cvs print (, ) print = } def
/dp { print 2 copy
   exch 40 string cvs print (, ) print = } def

/S {
  bg { dup dobackgroundstring } if
  ul { sp1 } if
  show
  ul { dounderline } if
} def

/W {
  ul { sp1 } if
  ( ) stringwidth                       % Get the width of a space
  pop                                   % Discard the Y component
  mul                                   % Multiply the width of a
                                        % space by the number of
                                        % spaces to plot
  bg { dup dobackground } if
  0 rmoveto
  ul { dounderline } if
} def

/BeginDSCPage {
  /vmstate save def
} def

/BeginPage {
  PrintHeader {
    PrintHeaderFrame { HeaderFrame } if
    HeaderText
  } if
  LeftMargin
  BottomMargin PrintHeight add
  moveto                                % move to where printing will
                                        % start.
} def

/EndPage {
  bg { eolbg } if
  ul { eolul } if
  showpage                              % Spit out a page
} def

/EndDSCPage {
  vmstate restore
} def

/ul false def

/UL { /ul exch def } def

/h0 14 /Helvetica-Bold Font
/h1 12 /Helvetica Font

/h1 F

/HeaderLineHeight FontHeight def
/HeaderDescent Descent def
/HeaderPad 2 def

/SetHeaderLines {
  /HeaderOffset TopMargin 2 div def
  /HeaderLines exch def
  /HeaderHeight HeaderLines HeaderLineHeight mul HeaderPad 2 mul add def
  /PrintHeight PrintHeight HeaderHeight sub def
} def

/HeaderFrameStart {
  LeftMargin BottomMargin PrintHeight add HeaderOffset add
} def

/HeaderFramePath {
  PrintWidth 0 rlineto
  0 HeaderHeight rlineto
  PrintWidth neg 0 rlineto
  0 HeaderHeight neg rlineto
} def

/HeaderFrame {
  gsave
    0.4 setlinewidth
    HeaderFrameStart moveto
    1 -1 rmoveto
    HeaderFramePath
    0 setgray fill
    HeaderFrameStart moveto
    HeaderFramePath
    gsave 0.9 setgray fill grestore
    gsave 0 setgray stroke grestore
  grestore
} def

/HeaderStart {
  HeaderFrameStart
  exch HeaderPad add exch
  HeaderLineHeight HeaderLines 1 sub mul add HeaderDescent sub HeaderPad add
} def

/strcat {
  dup length 3 -1 roll dup length dup 4 -1 roll add string dup
  0 5 -1 roll putinterval
  dup 4 2 roll exch putinterval
} def

/pagenumberstring {
  PageNumber 32 string cvs
  ShowNofN {
    (/) strcat
    PageCount 32 string cvs strcat
  } if
} def

/HeaderText {
  HeaderStart moveto

  HeaderLinesRight HeaderLinesLeft
  Duplex PageNumber 1 and 0 eq and { exch } if

  {
    aload pop
    exch F
    gsave
      dup xcheck { exec } if
      show
    grestore
    0 HeaderLineHeight neg rmoveto
  } forall

  HeaderStart moveto

   {
    aload pop
    exch F
    gsave
      dup xcheck { exec } if
      dup stringwidth pop
      PrintWidth exch sub HeaderPad 2 mul sub 0 rmoveto
      show
    grestore
    0 HeaderLineHeight neg rmoveto
  } forall
} def

/ReportFontInfo {
  2 copy
  /t0 3 1 roll Font
  /t0 F
  /lh FontHeight def
  /sw ( ) stringwidth pop def
  /aw (01234567890abcdefghijklmnopqrstuvwxyz) dup length exch
  stringwidth pop exch div def
  /t1 12 /Helvetica-Oblique Font
  /t1 F
  72 72 moveto
  gsave
    (For ) show
    128 string cvs show
    ( ) show
    32 string cvs show
    ( point, the line height is ) show
    lh 32 string cvs show
    (, the space width is ) show
    sw 32 string cvs show
    (,) show
  grestore
  0 FontHeight neg rmoveto
  (and a crude estimate of average character width is ) show
  aw 32 string cvs show
  (.) show
  showpage
} def

% 10 /Courier ReportFontInfo
")

;; Start Editing Here:

(defvar ps-source-buffer nil)
(defvar ps-spool-buffer-name "*PostScript*")
(defvar ps-spool-buffer nil)

(defvar ps-output-head nil)
(defvar ps-output-tail nil)

(defvar ps-page-count 0)
(defvar ps-showpage-count 0)

(defvar ps-current-font 0)
(defvar ps-current-underline-p nil)
(defvar ps-default-color (if ps-print-color-p ps-default-fg)) ; black
(defvar ps-current-color ps-default-color)
(defvar ps-current-bg nil)

(defvar ps-razchunk 0)

(defvar ps-color-format (if (eq ps-print-emacs-type 'emacs)

                            ;;Emacs understands the %f format; we'll
                            ;;use it to limit color RGB values to
                            ;;three decimals to cut down some on the
                            ;;size of the PostScript output.
                            "%0.3f %0.3f %0.3f"

                          ;; Lucid emacsen will have to make do with
                          ;; %s (princ) for floats.
                          "%s %s %s"))

;; These values determine how much print-height to deduct when headers
;; are turned on.  This is a pretty clumsy way of handling it, but
;; it'll do for now.
(defvar ps-header-title-line-height (if (fboundp 'float) 16.0 16));Helvetica 14
(defvar ps-header-line-height (if (fboundp 'float) 13.7 14));Helvetica 12
(defvar ps-header-pad 2)

;; LetterSmall 7.68 inch 10.16 inch
;; Tabloid 11.0 inch 17.0 inch
;; Ledger 17.0 inch 11.0 inch
;; Statement 5.5 inch 8.5 inch
;; Executive 7.5 inch 10.0 inch
;; A3 11.69 inch 16.5 inch
;; A4Small 7.47 inch 10.85 inch
;; B4 10.125 inch 14.33 inch
;; B5 7.16 inch 10.125 inch

;; All page dimensions are in PostScript points.

(defvar ps-left-margin 72)              ; 1 inch
(defvar ps-right-margin 72)             ; 1 inch
(defvar ps-bottom-margin 36)            ; 1/2 inch
(defvar ps-top-margin 72)               ; 1 inch

;; Letter 8.5 inch x 11.0 inch
(defvar ps-letter-page-height 792)      ; 11 inches
(defvar ps-letter-page-width 612)       ; 8.5 inches

;; Legal 8.5 inch x 14.0 inch
(defvar ps-legal-page-height 1008)      ; 14.0 inches
(defvar ps-legal-page-width 612)        ; 8.5 inches

;; A4 8.26 inch x 11.69 inch
(defvar ps-a4-page-height 842)  ; 11.69 inches
(defvar ps-a4-page-width 595)   ; 8.26 inches

(defvar ps-pages-alist
  (list (list 'ps-letter ps-letter-page-width ps-letter-page-height)
        (list 'ps-legal ps-legal-page-width ps-legal-page-height)
        (list 'ps-a4 ps-a4-page-width ps-a4-page-height)))

;; Define some constants to index into the page lists.
(defvar ps-page-width-i 1)
(defvar ps-page-height-i 2)

(defvar ps-page-dimensions nil)
(defvar ps-print-width nil)
(defvar ps-print-height nil)

(defvar ps-height-remaining)
(defvar ps-width-remaining)

(defvar ps-ref-bold-faces nil)
(defvar ps-ref-italic-faces nil)
(defvar ps-ref-underlined-faces nil)

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Internal functions

(defun ps-get-page-dimensions ()
  (setq ps-page-dimensions (assq ps-paper-type ps-pages-alist))
  (let ((ps-page-width (nth ps-page-width-i ps-page-dimensions))
        (ps-page-height (nth ps-page-height-i ps-page-dimensions)))
    (setq ps-print-height (- ps-page-height ps-top-margin ps-bottom-margin))
    (setq ps-print-width (- ps-page-width ps-left-margin ps-right-margin))))

(defun ps-print-preprint (&optional filename)
  (if (and filename
           (or (numberp filename)
               (listp filename)))
      (let* ((name (concat (buffer-name) ".ps"))
             (prompt (format "Save PostScript to file: (default %s) "
                             name)))
        (read-file-name prompt default-directory
                        name nil))))

;; The following functions implement a simple list-buffering scheme so
;; that ps-print doesn't have to repeatedly switch between buffers
;; while spooling.  The functions ps-output and ps-output-string build
;; up the lists; the function ps-flush-output takes the lists and
;; insert its contents into the spool buffer (*PostScript*).

(defun ps-output-string-prim (string)
  (insert "(")                          ;insert start-string delimiter
  (save-excursion                       ;insert string
    (insert string))

  ;; Find and quote special characters as necessary for PS
  (while (re-search-forward "[()\\]" nil t)
    (save-excursion
      (forward-char -1)
      (insert "\\")))

  (goto-char (point-max))
  (insert ")"))                         ;insert end-string delimiter

(defun ps-init-output-queue ()
  (setq ps-output-head (list ""))
  (setq ps-output-tail ps-output-head))

(defun ps-output (&rest args)
  (setcdr ps-output-tail args)
  (while (cdr ps-output-tail)
    (setq ps-output-tail (cdr ps-output-tail))))

(defun ps-output-string (string)
  (ps-output t string))

(defun ps-flush-output ()
  (save-excursion
    (set-buffer ps-spool-buffer)
    (goto-char (point-max))
    (while ps-output-head
      (let ((it (car ps-output-head)))
        (if (not (eq t it))
            (insert it)
          (setq ps-output-head (cdr ps-output-head))
          (ps-output-string-prim (car ps-output-head))))
      (setq ps-output-head (cdr ps-output-head))))
  (ps-init-output-queue))

(defun ps-insert-file (fname)
  (ps-flush-output)

  ;; Check to see that the file exists and is readable; if not, throw
  ;; and error.
  (if (not (file-readable-p fname))
      (error "Could not read file `%s'" fname))

  (save-excursion
    (set-buffer ps-spool-buffer)
    (goto-char (point-max))
    (insert-file fname)))
    
;; These functions insert the arrays that define the contents of the
;; headers.

(defun ps-generate-header-line (fonttag &optional content)
  (ps-output "  [ " fonttag " ")
  (cond
   ;; Literal strings should be output as is -- the string must
   ;; contain its own PS string delimiters, '(' and ')', if necessary.
   ((stringp content)
    (ps-output content))

   ;; Functions are called -- they should return strings; they will be
   ;; inserted as strings and the PS string delimiters added.
   ((and (symbolp content) (fboundp content))
    (ps-output-string (funcall content)))

   ;; Variables will have their contents inserted.  They should
   ;; contain strings, and will be inserted as strings.
   ((and (symbolp content) (boundp content))
    (ps-output-string (symbol-value content)))

   ;; Anything else will get turned into an empty string.
   (t
    (ps-output-string "")))
  (ps-output " ]\n"))

(defun ps-generate-header (name contents)
  (ps-output "/" name " [\n")
  (if (> ps-header-lines 0)
      (let ((count 1))
        (ps-generate-header-line "/h0" (car contents))
        (while (and (< count ps-header-lines)
                    (setq contents (cdr contents)))
          (ps-generate-header-line "/h1" (car contents))
          (setq count (+ count 1)))
        (ps-output "] def\n"))))

(defun ps-output-boolean (name bool)
  (ps-output (format "/%s %s def\n" name (if bool "true" "false"))))

(defun ps-begin-file ()
  (setq ps-showpage-count 0)

  (ps-output ps-adobe-tag)
  (ps-output "%%Title: " (buffer-name) "\n") ;Take job name from name of
                                        ;first buffer printed
  (ps-output "%%Creator: " (user-full-name) "\n")
  (ps-output "%%CreationDate: " 
             (time-stamp-hh:mm:ss) " " (time-stamp-mon-dd-yyyy) "\n")
  (ps-output "%% DocumentFonts: Helvetica Helvetica-Bold "
             ps-font " " ps-font-bold " " ps-font-italic " "
             ps-font-bold-italic "\n")
  (ps-output "%%Pages: (atend)\n")
  (ps-output "%%EndComments\n\n")

  (ps-output-boolean "Duplex" ps-spool-duplex)
  (ps-output-boolean "PrintHeader" ps-print-header)
  (ps-output-boolean "PrintHeaderFrame" ps-print-header-frame)
  (ps-output-boolean "ShowNofN" ps-show-n-of-n)

  (ps-output (format "/LeftMargin %d def\n" ps-left-margin))
  (ps-output (format "/RightMargin %d def\n" ps-right-margin))
  (ps-output (format "/BottomMargin %d def\n" ps-bottom-margin))
  (ps-output (format "/TopMargin %d def\n" ps-top-margin))

  (ps-get-page-dimensions)
  (ps-output (format "/PrintWidth %d def\n" ps-print-width))
  (ps-output (format "/PrintHeight %d def\n" ps-print-height))
  
  (ps-output (format "/LineHeight %s def\n" ps-line-height))
  
  (ps-output ps-print-prologue)

  (ps-output (format "/f0 %d /%s Font\n" ps-font-size ps-font))
  (ps-output (format "/f1 %d /%s Font\n" ps-font-size ps-font-bold))
  (ps-output (format "/f2 %d /%s Font\n" ps-font-size ps-font-italic))
  (ps-output (format "/f3 %d /%s Font\n" ps-font-size
                     ps-font-bold-italic))

  (ps-output "%%EndPrologue\n"))

(defun ps-header-dirpart ()
  (let ((fname (buffer-file-name)))
    (if fname
        (if (string-equal (buffer-name) (file-name-nondirectory fname))
            (file-name-directory fname)
          fname)
      "")))

(defun ps-get-buffer-name ()
  ;; Indulge me this little easter egg:
  (if (string= (buffer-name) "ps-print.el")
      "Hey, Cool!  It's ps-print.el!!!"
    (buffer-name)))

(defun ps-begin-job ()
  (setq ps-page-count 0))

(defun ps-end-file ()
  (ps-output "%%Trailer\n")
  (ps-output "%%Pages: " (format "%d\n" ps-showpage-count)))

(defun ps-next-page ()
  (ps-end-page)
  (ps-flush-output)
  (ps-begin-page))

(defun ps-begin-page (&optional dummypage)
  (ps-get-page-dimensions)
  (setq ps-width-remaining ps-print-width)
  (setq ps-height-remaining ps-print-height)

  ;; If headers are turned on, deduct the height of the header from
  ;; the print height remaining.  Clumsy clumsy clumsy.
  (if ps-print-header
      (setq ps-height-remaining
            (- ps-height-remaining
               ps-header-title-line-height
               (* ps-header-line-height (- ps-header-lines 1))
               (* 2 ps-header-pad))))

  (setq ps-page-count (+ ps-page-count 1))

  (ps-output "\n%%Page: " 
             (format "%d %d\n" ps-page-count (+ 1 ps-showpage-count)))
  (ps-output "BeginDSCPage\n")
  (ps-output (format "/PageNumber %d def\n" ps-page-count))
  (ps-output "/PageCount 0 def\n")

  (if ps-print-header
      (progn
        (ps-generate-header "HeaderLinesLeft" ps-left-header)
        (ps-generate-header "HeaderLinesRight" ps-right-header)
        (ps-output (format "%d SetHeaderLines\n" ps-header-lines))))

  (ps-output "BeginPage\n")
  (ps-set-font ps-current-font)
  (ps-set-bg ps-current-bg)
  (ps-set-color ps-current-color)
  (ps-set-underline ps-current-underline-p))

(defun ps-end-page ()
  (setq ps-showpage-count (+ 1 ps-showpage-count))
  (ps-output "EndPage\n")
  (ps-output "EndDSCPage\n"))

(defun ps-dummy-page ()
  (setq ps-showpage-count (+ 1 ps-showpage-count))
  (ps-output "%%Page: " (format "- %d\n" ps-showpage-count)
             "BeginDSCPage
/PrintHeader false def
BeginPage
EndPage
EndDSCPage\n"))
            
(defun ps-next-line ()
  (if (< ps-height-remaining ps-line-height)
      (ps-next-page)
    (setq ps-width-remaining ps-print-width)
    (setq ps-height-remaining (- ps-height-remaining ps-line-height))
    (ps-hard-lf)))

(defun ps-continue-line ()
  (if (< ps-height-remaining ps-line-height)
      (ps-next-page)
    (setq ps-width-remaining ps-print-width)
    (setq ps-height-remaining (- ps-height-remaining ps-line-height))
    (ps-soft-lf)))

(defun ps-hard-lf ()
  (ps-output "HL\n"))

(defun ps-soft-lf ()
  (ps-output "SL\n"))

(defun ps-find-wrappoint (from to char-width)
  (let ((avail (truncate (/ ps-width-remaining char-width)))
        (todo (- to from)))
    (if (< todo avail)
        (cons to (* todo char-width))
      (cons (+ from avail) ps-width-remaining))))

(defun ps-basic-plot-string (from to &optional bg-color)
  (let* ((wrappoint (ps-find-wrappoint from to ps-avg-char-width))
         (to (car wrappoint))
         (string (buffer-substring from to)))
    (ps-output-string string)
    (ps-output " S\n")                  ;
    wrappoint))

(defun ps-basic-plot-whitespace (from to &optional bg-color)
  (let* ((wrappoint (ps-find-wrappoint from to ps-space-width))
         (to (car wrappoint)))

    (ps-output (format "%d W\n" (- to from)))
    wrappoint))

(defun ps-plot (plotfunc from to &optional bg-color)
  (while (< from to)
    (let* ((wrappoint (funcall plotfunc from to bg-color))
           (plotted-to (car wrappoint))
           (plotted-width (cdr wrappoint)))
      (setq from plotted-to)
      (setq ps-width-remaining (- ps-width-remaining plotted-width))
      (if (< from to)
          (ps-continue-line))))
  (if ps-razzle-dazzle
      (let* ((q-todo (- (point-max) (point-min)))
             (q-done (- (point) (point-min)))
             (chunkfrac (/ q-todo 8))
             (chunksize (if (> chunkfrac 1000) 1000 chunkfrac)))
        (if (> (- q-done ps-razchunk) chunksize)
            (let (foo)
              (setq ps-razchunk q-done)
              (setq foo
                    (if (< q-todo 100)
                        (/ (* 100 q-done) q-todo)
                      (/ q-done (/ q-todo 100))))
              (message "Formatting...%d%%" foo))))))

(defun ps-set-font (font)
  (setq ps-current-font font)
  (ps-output (format "/f%d F\n" ps-current-font)))

(defvar ps-print-color-scale nil)

(defun ps-set-bg (color)
  (if (setq ps-current-bg color)
      (ps-output (format ps-color-format (nth 0 color) (nth 1 color)
                         (nth 2 color))
                 " true BG\n")
    (ps-output "false BG\n")))

(defun ps-set-color (color)
  (if (setq ps-current-color color)
      nil
    (setq ps-current-color ps-default-fg))
  (ps-output (format ps-color-format (nth 0 ps-current-color)
                     (nth 1 ps-current-color) (nth 2 ps-current-color))
             " FG\n"))

(defun ps-set-underline (underline-p)
  (ps-output (if underline-p "true" "false") " UL\n")
  (setq ps-current-underline-p underline-p))

(defun ps-plot-region (from to font fg-color &optional bg-color underline-p)

  (if (not (equal font ps-current-font))
      (ps-set-font font))
  
  ;; Specify a foreground color only if one's specified and it's
  ;; different than the current.
  (if (not (equal fg-color ps-current-color))
      (ps-set-color fg-color))
  
  (if (not (equal bg-color ps-current-bg))
      (ps-set-bg bg-color))
  
  ;; Toggle underlining if different.
  (if (not (equal underline-p ps-current-underline-p))
      (ps-set-underline underline-p))

  ;; Starting at the beginning of the specified region...
  (save-excursion
    (goto-char from)

    ;; ...break the region up into chunks separated by tabs, linefeeds,
    ;; and pagefeeds, and plot each chunk.
    (while (< from to)
      (if (re-search-forward "[\t\n\f]" to t)
          (let ((match (char-after (match-beginning 0))))
            (cond
             ((= match ?\t)
              (let ((linestart
                     (save-excursion (beginning-of-line) (point))))
                (ps-plot 'ps-basic-plot-string from (- (point) 1)
                         bg-color)
                (forward-char -1)
                (setq from (+ linestart (current-column)))
                (if (re-search-forward "[ \t]+" to t)
                    (ps-plot 'ps-basic-plot-whitespace
                             from (+ linestart (current-column))
                             bg-color))))

             ((= match ?\n)
              (ps-plot 'ps-basic-plot-string from (- (point) 1)
                       bg-color)
              (ps-next-line)
              )

             ((= match ?\f)
              (ps-plot 'ps-basic-plot-string from (- (point) 1)
                       bg-color)
              (ps-next-page)))
            (setq from (point)))
        (ps-plot 'ps-basic-plot-string from to bg-color)
        (setq from to)))))

(defun ps-color-value (x-color-value)
  ;; Scale 16-bit X-COLOR-VALUE to PostScript color value in [0, 1] interval.
  (/ x-color-value ps-print-color-scale))

(defun ps-color-values (x-color)
  (cond ((fboundp 'x-color-values)
         (x-color-values x-color))
        ((fboundp 'pixel-components)
         (pixel-components x-color))
        (t (error "No available function to determine X color values."))))

(defun ps-face-attributes (face)
  (let ((differs (face-differs-from-default-p face)))
    (list (memq face ps-ref-bold-faces)
          (memq face ps-ref-italic-faces)
          (memq face ps-ref-underlined-faces)
          (and differs (face-foreground face))
          (and differs (face-background face)))))

(defun ps-face-attribute-list (face-or-list)
  (if (listp face-or-list)
      (let (bold-p italic-p underline-p foreground background face-attr face)
        (while face-or-list
          (setq face (car face-or-list))
          (setq face-attr (ps-face-attributes face))
          (setq bold-p (or bold-p (nth 0 face-attr)))
          (setq italic-p (or italic-p (nth 1 face-attr)))
          (setq underline-p (or underline-p (nth 2 face-attr)))
          (if foreground
              nil
            (setq foreground (nth 3 face-attr)))
          (if background
              nil
            (setq background (nth 4 face-attr)))
          (setq face-or-list (cdr face-or-list)))
        (list bold-p italic-p underline-p foreground background))

    (ps-face-attributes face-or-list)))

(defun ps-plot-with-face (from to face)
  (if face
      (let* ((face-attr (ps-face-attribute-list face))
             (bold-p (nth 0 face-attr))
             (italic-p (nth 1 face-attr))
             (underline-p (nth 2 face-attr))
             (foreground (nth 3 face-attr))
             (background (nth 4 face-attr))
             (fg-color (if (and ps-print-color-p foreground)
                           (mapcar 'ps-color-value
                                   (ps-color-values foreground))
                         ps-default-color))
             (bg-color (if (and ps-print-color-p background)
                           (mapcar 'ps-color-value
                                   (ps-color-values background)))))
        (ps-plot-region from to
                        (cond ((and bold-p italic-p) 3)
                              (italic-p 2)
                              (bold-p 1)
                              (t 0))
;                       (or fg-color '(0.0 0.0 0.0))
                        fg-color
                        bg-color underline-p))
    (goto-char to)))


(defun ps-emacs-face-kind-p (face kind kind-regex kind-list)
  (let ((frame-font (face-font face))
        (face-defaults (face-font face t)))
    (or
     ;; Check FACE defaults:
     (and (listp face-defaults)
          (memq kind face-defaults))

     ;; Check the user's preferences
     (memq face kind-list))))

(defun ps-xemacs-face-kind-p (face kind kind-regex kind-list)
  (let* ((frame-font (or (face-font face) (face-font 'default)))
         (kind-cons (assq kind (x-font-properties frame-font)))
         (kind-spec (cdr-safe kind-cons))
         (case-fold-search t))

    (or (and kind-spec (string-match kind-regex kind-spec))
        ;; Kludge-compatible:
        (memq face kind-list))))

(defun ps-face-bold-p (face)
  (if (eq ps-print-emacs-type 'emacs)
      (ps-emacs-face-kind-p face 'bold "-\\(bold\\|demibold\\)-"
                          ps-bold-faces)
    (ps-xemacs-face-kind-p face 'WEIGHT_NAME "bold\\|demibold"
                           ps-bold-faces)))

(defun ps-face-italic-p (face)
  (if (eq ps-print-emacs-type 'emacs)
      (ps-emacs-face-kind-p face 'italic "-[io]-" ps-italic-faces)
    (or
     (ps-xemacs-face-kind-p face 'ANGLE_NAME "i\\|o" ps-italic-faces)
     (ps-xemacs-face-kind-p face 'SLANT "i\\|o" ps-italic-faces))))

(defun ps-face-underlined-p (face)
  (or (face-underline-p face)
      (memq face ps-underlined-faces)))

;; Ensure that face-list is fbound.
(or (fboundp 'face-list) (defalias 'face-list 'list-faces))

(defun ps-build-reference-face-lists ()
  (if ps-auto-font-detect
      (let ((faces (face-list))
            the-face)
        (setq ps-ref-bold-faces nil
              ps-ref-italic-faces nil
              ps-ref-underlined-faces nil)
        (while faces
          (setq the-face (car faces))
          (if (ps-face-italic-p the-face)
              (setq ps-ref-italic-faces
                    (cons the-face ps-ref-italic-faces)))
          (if (ps-face-bold-p the-face)
              (setq ps-ref-bold-faces
                    (cons the-face ps-ref-bold-faces)))
          (if (ps-face-underlined-p the-face)
              (setq ps-ref-underlined-faces
                    (cons the-face ps-ref-underlined-faces)))
          (setq faces (cdr faces))))
    (setq ps-ref-bold-faces ps-bold-faces)
    (setq ps-ref-italic-faces ps-italic-faces)
    (setq ps-ref-underlined-faces ps-underlined-faces))
  (setq ps-build-face-reference nil))

(defun ps-mapper (extent list)
  (nconc list (list (list (extent-start-position extent) 'push extent)
                    (list (extent-end-position extent) 'pull extent)))
  nil)

(defun ps-sorter (a b)
  (< (car a) (car b)))

(defun ps-extent-sorter (a b)
  (< (extent-priority a) (extent-priority b)))

(defun ps-print-ensure-fontified (start end)
  (if (and (boundp 'lazy-lock-mode) lazy-lock-mode)
      (if (fboundp 'lazy-lock-fontify-region)
          (lazy-lock-fontify-region start end)
        (lazy-lock-fontify-buffer))))

(defun ps-generate-postscript-with-faces (from to)
  ;; Build the reference lists of faces if necessary.
  (if (or ps-always-build-face-reference
          ps-build-face-reference)
      (progn
        (message "Collecting face information...")
        (ps-build-reference-face-lists)))
  ;; Set the color scale.  We do it here instead of in the defvar so
  ;; that ps-print can be dumped into emacs.  This expression can't be
  ;; evaluated at dump-time because X isn't initialized.
  (setq ps-print-color-scale
        (if ps-print-color-p
            (float (car (ps-color-values "white")))
          1.0))
  ;; Generate some PostScript.
  (save-restriction
    (narrow-to-region from to)
    (let ((face 'default)
          (position to))
      (ps-print-ensure-fontified from to)
      (cond ((or (eq ps-print-emacs-type 'lucid) (eq ps-print-emacs-type 'xemacs))
           ;; Build the list of extents...
           (let ((a (cons 'dummy nil))
                 record type extent extent-list)
             (map-extents 'ps-mapper nil from to a)
             (setq a (cdr a))
             (setq a (sort a 'ps-sorter))
           
             (setq extent-list nil)
           
             ;; Loop through the extents...
             (while a
               (setq record (car a))
             
               (setq position (car record))
               (setq record (cdr record))
             
               (setq type (car record))
               (setq record (cdr record))
             
               (setq extent (car record))
             
               ;; Plot up to this record.
               ;; XEmacs 19.12: for some reason, we're getting into a
               ;; situation in which some of the records have
               ;; positions less than 'from'.  Since we've narrowed
               ;; the buffer, this'll generate errors.  This is a
               ;; hack, but don't call ps-plot-with-face unless from >
               ;; point-min.
               (if (and (>= from (point-min))
                        (<= position (point-max)))
                   (ps-plot-with-face from position face))
             
               (cond
                ((eq type 'push)
                 (if (extent-face extent)
                     (setq   extent-list (sort (cons extent extent-list)
                                               'ps-extent-sorter))))
              
                ((eq type 'pull)
                 (setq extent-list (sort (delq extent extent-list)
                                         'ps-extent-sorter))))
             
               (setq face
                     (if extent-list
                         (extent-face (car extent-list))
                       'default))
             
               (setq from position)
               (setq a (cdr a)))))

            ((eq ps-print-emacs-type 'emacs)
             (let ((property-change from)
                   (overlay-change from))
               (while (< from to)
                 (if (< property-change to) ; Don't search for property change
                                        ; unless previous search succeeded.
                     (setq property-change
                           (next-property-change from nil to)))
                 (if (< overlay-change to) ; Don't search for overlay change
                                        ; unless previous search succeeded.
                     (setq overlay-change
                           (min (next-overlay-change from) to)))
                 (setq position
                       (min property-change overlay-change))
                 ;; The code below is not quite correct,
                 ;; because a non-nil overlay invisible property
                 ;; which is inactive according to the current value
                 ;; of buffer-invisibility-spec nonetheless overrides
                 ;; a face text property.
                 (setq face
                       (cond ((let ((prop (get-text-property from 'invisible)))
                                ;; Decide whether this invisible property
                                ;; really makes the text invisible.
                                (if (eq buffer-invisibility-spec t)
                                    (not (null prop))
                                  (or (memq prop buffer-invisibility-spec)
                                      (assq prop buffer-invisibility-spec))))
                              nil)
                             ((get-text-property from 'face))
                             (t 'default)))
                 (let ((overlays (overlays-at from))
                       (face-priority -1)) ; text-property
                   (while overlays
                     (let* ((overlay (car overlays))
                            (overlay-face (overlay-get overlay 'face))
                            (overlay-invisible (overlay-get overlay 'invisible))
                            (overlay-priority (or (overlay-get overlay
                                                               'priority)
                                                  0)))
                       (if (and (or overlay-invisible overlay-face)
                                (> overlay-priority face-priority))
                           (setq face (cond ((if (eq buffer-invisibility-spec t)
                                                 (not (null overlay-invisible))
                                               (or (memq overlay-invisible buffer-invisibility-spec)
                                                   (assq overlay-invisible buffer-invisibility-spec)))
                                             nil)
                                            ((and face overlay-face)))
                                 face-priority overlay-priority)))
                     (setq overlays (cdr overlays))))
                 ;; Plot up to this record.
                 (ps-plot-with-face from position face)
                 (setq from position)))))
      (ps-plot-with-face from to face))))  

(defun ps-generate-postscript (from to)
  (ps-plot-region from to 0 nil))

(defun ps-generate (buffer from to genfunc)
  (let ((from (min to from))
        (to (max to from)))
    (save-restriction
      (narrow-to-region from to)
      (if ps-razzle-dazzle
          (message "Formatting...%d%%" (setq ps-razchunk 0)))
      (set-buffer buffer)
      (setq ps-source-buffer buffer)
      (setq ps-spool-buffer (get-buffer-create ps-spool-buffer-name))
      (ps-init-output-queue)
      (let (safe-marker completed-safely needs-begin-file)
        (unwind-protect
            (progn
              (set-buffer ps-spool-buffer)
            
              ;; Get a marker and make it point to the current end of the
              ;; buffer,  If an error occurs, we'll delete everything from
              ;; the end of this marker onwards.
              (setq safe-marker (make-marker))
              (set-marker safe-marker (point-max))
            
              (goto-char (point-min))
              (if (looking-at (regexp-quote "%!PS-Adobe-1.0"))
                  nil
                (setq needs-begin-file t))
              (save-excursion
                (set-buffer ps-source-buffer)
                (if needs-begin-file (ps-begin-file))
                (ps-begin-job)
                (ps-begin-page))
              (set-buffer ps-source-buffer)
              (funcall genfunc from to)
              (ps-end-page)
            
              (if (and ps-spool-duplex
                       (= (mod ps-page-count 2) 1))
                  (ps-dummy-page))
              (ps-flush-output)
            
              ;; Back to the PS output buffer to set the page count
              (set-buffer ps-spool-buffer)
              (goto-char (point-max))
              (while (re-search-backward "^/PageCount 0 def$" nil t)
                (replace-match (format "/PageCount %d def" ps-page-count) t))

              ;; Setting this variable tells the unwind form that the
              ;; the postscript was generated without error.
              (setq completed-safely t))

          ;; Unwind form: If some bad mojo occurred while generating
          ;; postscript, delete all the postscript that was generated.
          ;; This protects the previously spooled files from getting
          ;; corrupted.
          (if (and (markerp safe-marker) (not completed-safely))
              (progn
                (set-buffer ps-spool-buffer)
                (delete-region (marker-position safe-marker) (point-max))))))

      (if ps-razzle-dazzle
          (message "Formatting...done")))))

(defun ps-do-despool (filename)
  (if (or (not (boundp 'ps-spool-buffer))
          (not ps-spool-buffer))
      (message "No spooled PostScript to print")
    (ps-end-file)
    (ps-flush-output)
    (if filename
        (save-excursion
          (if ps-razzle-dazzle
              (message "Saving..."))
          (set-buffer ps-spool-buffer)
          (setq filename (expand-file-name filename))
          (write-region (point-min) (point-max) filename)
          (if ps-razzle-dazzle
              (message "Wrote %s" filename)))
      ;; Else, spool to the printer
      (if ps-razzle-dazzle
          (message "Printing..."))
      (save-excursion
        (set-buffer ps-spool-buffer)
        (if (and (eq system-type 'ms-dos) (stringp dos-ps-printer))
            (write-region (point-min) (point-max) dos-ps-printer t 0)
          (let ((binary-process-input t)) ; for MS-DOS
            (apply 'call-process-region
                   (point-min) (point-max) ps-lpr-command nil
                   (if (fboundp 'start-process) 0 nil)
                   nil
                   ps-lpr-switches))))
      (if ps-razzle-dazzle
          (message "Printing...done")))
    (kill-buffer ps-spool-buffer)))

(defun ps-kill-emacs-check ()
  (let (ps-buffer)
    (if (and (setq ps-buffer (get-buffer ps-spool-buffer-name))
             (buffer-modified-p ps-buffer))
        (if (y-or-n-p "Unprinted PostScript waiting; print now? ")
            (ps-despool)))
    (if (and (setq ps-buffer (get-buffer ps-spool-buffer-name))
             (buffer-modified-p ps-buffer))
        (if (yes-or-no-p "Unprinted PostScript waiting; exit anyway? ")
            nil
          (error "Unprinted PostScript")))))

(if (fboundp 'add-hook)
    (add-hook 'kill-emacs-hook 'ps-kill-emacs-check)
  (if kill-emacs-hook
      (message "Won't override existing kill-emacs-hook")
    (setq kill-emacs-hook 'ps-kill-emacs-check)))

;;; Sample Setup Code:

;; This stuff is for anybody that's brave enough to look this far,
;; and able to figure out how to use it.  It isn't really part of ps-
;; print, but I'll leave it here in hopes it might be useful:

;; WARNING!!! The following code is *sample* code only. Don't use it
;; unless you understand what it does!

(defmacro ps-prsc () (list 'if (list 'eq 'ps-print-emacs-type ''emacs)
                           [f22] ''f22))
(defmacro ps-c-prsc () (list 'if (list 'eq 'ps-print-emacs-type ''emacs)
                             [C-f22]
                             ''(control f22)))
(defmacro ps-s-prsc () (list 'if (list 'eq 'ps-print-emacs-type ''emacs)
                             [S-f22]
                             ''(shift f22)))

;; Look in an article or mail message for the Subject: line.  To be
;; placed in ps-left-headers.
(defun ps-article-subject ()
  (save-excursion
    (goto-char (point-min))
    (if (re-search-forward "^Subject:[ \t]+\\(.*\\)$")
        (buffer-substring (match-beginning 1) (match-end 1))
      "Subject ???")))

;; Look in an article or mail message for the From: line.  Sorta-kinda
;; understands RFC-822 addresses and can pull the real name out where
;; it's provided.  To be placed in ps-left-headers.
(defun ps-article-author ()
  (save-excursion
    (goto-char (point-min))
    (if (re-search-forward "^From:[ \t]+\\(.*\\)$")
        (let ((fromstring (buffer-substring (match-beginning 1) (match-end 1))))
          (cond

           ;; Try first to match addresses that look like
           ;; thompson@wg2.waii.com (Jim Thompson)
           ((string-match ".*[ \t]+(\\(.*\\))" fromstring)
            (substring fromstring (match-beginning 1) (match-end 1)))

           ;; Next try to match addresses that look like
           ;; Jim Thompson <thompson@wg2.waii.com>
           ((string-match "\\(.*\\)[ \t]+<.*>" fromstring)
            (substring fromstring (match-beginning 1) (match-end 1)))

           ;; Couldn't find a real name -- show the address instead.
           (t fromstring)))
      "From ???")))

;; A hook to bind to gnus-Article-prepare-hook.  This will set the ps-
;; left-headers specially for gnus articles.  Unfortunately, gnus-
;; article-mode-hook is called only once, the first time the *Article*
;; buffer enters that mode, so it would only work for the first time
;; we ran gnus.  The second time, this hook wouldn't get set up.  The
;; only alternative is gnus-article-prepare-hook.
(defun ps-gnus-article-prepare-hook ()
  (setq ps-header-lines 3)
  (setq ps-left-header
        ;; The left headers will display the article's subject, its
        ;; author, and the newsgroup it was in.
        (list 'ps-article-subject 'ps-article-author 'gnus-newsgroup-name)))

;; A hook to bind to vm-mode-hook to locally bind prsc and set the ps-
;; left-headers specially for mail messages.  This header setup would
;; also work, I think, for RMAIL.
(defun ps-vm-mode-hook ()
  (local-set-key (ps-prsc) 'ps-vm-print-message-from-summary)
  (setq ps-header-lines 3)
  (setq ps-left-header
        ;; The left headers will display the message's subject, its
        ;; author, and the name of the folder it was in.
        (list 'ps-article-subject 'ps-article-author 'buffer-name)))

;; Every now and then I forget to switch from the *Summary* buffer to
;; the *Article* before hitting prsc, and a nicely formatted list of
;; article subjects shows up at the printer.  This function, bound to
;; prsc for the gnus *Summary* buffer means I don't have to switch
;; buffers first.
(defun ps-gnus-print-article-from-summary ()
  (interactive)
  (if (get-buffer "*Article*")
      (save-excursion
        (set-buffer "*Article*")
        (ps-spool-buffer-with-faces))))

;; See ps-gnus-print-article-from-summary.  This function does the
;; same thing for vm.
(defun ps-vm-print-message-from-summary ()
  (interactive)
  (if vm-mail-buffer
      (save-excursion
        (set-buffer vm-mail-buffer)
        (ps-spool-buffer-with-faces))))

;; A hook to bind to bind to gnus-summary-setup-buffer to locally bind
;; prsc.
(defun ps-gnus-summary-setup ()
  (local-set-key (ps-prsc) 'ps-gnus-print-article-from-summary))

;; Look in an article or mail message for the Subject: line.  To be
;; placed in ps-left-headers.
(defun ps-info-file ()
  (save-excursion
    (goto-char (point-min))
    (if (re-search-forward "File:[ \t]+\\([^, \t\n]*\\)")
        (buffer-substring (match-beginning 1) (match-end 1))
      "File ???")))

;; Look in an article or mail message for the Subject: line.  To be
;; placed in ps-left-headers.
(defun ps-info-node ()
  (save-excursion
    (goto-char (point-min))
    (if (re-search-forward "Node:[ \t]+\\([^,\t\n]*\\)")
        (buffer-substring (match-beginning 1) (match-end 1))
      "Node ???")))

(defun ps-info-mode-hook ()
  (setq ps-left-header
        ;; The left headers will display the node name and file name.
        (list 'ps-info-node 'ps-info-file)))

;; WARNING! The following function is a *sample* only, and is *not*
;; meant to be used as a whole unless you understand what the effects
;; will be!  (In fact, this is a copy if my setup for ps-print -- I'd
;; be very surprised if it was useful to *anybody*, without
;; modification.)

(defun ps-jts-ps-setup ()
  (global-set-key (ps-prsc) 'ps-spool-buffer-with-faces) ;f22 is prsc
  (global-set-key (ps-s-prsc) 'ps-spool-region-with-faces)
  (global-set-key (ps-c-prsc) 'ps-despool)
  (add-hook 'gnus-article-prepare-hook 'ps-gnus-article-prepare-hook)
  (add-hook 'gnus-summary-mode-hook 'ps-gnus-summary-setup)
  (add-hook 'vm-mode-hook 'ps-vm-mode-hook)
  (add-hook 'vm-mode-hooks 'ps-vm-mode-hook)
  (add-hook 'Info-mode-hook 'ps-info-mode-hook)
  (setq ps-spool-duplex t)
  (setq ps-print-color-p nil)
  (setq ps-lpr-command "lpr")
  (setq ps-lpr-switches '("-Jjct,duplex_long")))

(provide 'ps-print)

;;; ps-print.el ends here