code.delx.au - gnu-emacs/blob - lisp/lpr.el

   1 ;;; lpr.el --- print Emacs buffer on line printer.
   2
   3 ;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: unix
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Commands to send the region or a buffer your printer.  Entry points
  28 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
  29 ;; variables include `printer-name', `lpr-switches' and `lpr-command'.
  30
  31 ;;; Code:
  32
  33 (defgroup lpr nil
  34   "Print Emacs buffer on line printer"
  35   :group 'wp)
  36
  37 ;;;###autoload
  38 (defcustom printer-name
  39   (if (memq system-type '(ms-dos windows-nt)) "PRN")
  40   "*The name of a local printer to which data is sent for printing.
  41 \(Note that PostScript files are sent to `ps-printer-name', which see.\)
  42
  43 On Unix-like systems, a string value should be a name understood by
  44 lpr's -P option.
  45
  46 On MS-DOS and MS-Windows systems, it is the name of a printer device or
  47 port.  Typical non-default settings would be \"LPT1\" to \"LPT3\" for
  48 parallel printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial
  49 printers, or \"//hostname/printer\" for a shared network printer.  You
  50 can also set it to a name of a file, in which case the output gets
  51 appended to that file.  If you want to discard the printed output, set
  52 this to \"NUL\"."
  53   :type '(choice ; could use string but then we lose completion for files.
  54                  (file :tag "Name")
  55                  (const :tag "Default" nil))
  56   :group 'lpr)
  57
  58 ;;;###autoload
  59 (defcustom lpr-switches nil
  60   "*List of strings to pass as extra options for the printer program.
  61 It is recommended to set `printer-name' instead of including an explicit
  62 switch on this list.
  63 See `lpr-command'."
  64   :type '(repeat (string :tag "Argument"))
  65   :group 'lpr)
  66
  67 (defcustom lpr-add-switches (eq system-type 'berkeley-unix)
  68   "*Non-nil means construct -T and -J options for the printer program.
  69 These are made assuming that the program is `lpr';
  70 if you are using some other incompatible printer program,
  71 this variable should be nil."
  72   :type 'boolean
  73   :group 'lpr)
  74
  75 ;;;###autoload
  76 (defcustom lpr-command
  77   (if (memq system-type '(usg-unix-v dgux hpux irix))
  78       "lp" "lpr")
  79   "*Name of program for printing a file."
  80   :type 'string
  81   :group 'lpr)
  82
  83 ;; Default is nil, because that enables us to use pr -f
  84 ;; which is more reliable than pr with no args, which is what lpr -p does.
  85 (defcustom lpr-headers-switches nil
  86   "*List of strings of options to request page headings in the printer program.
  87 If nil, we run `lpr-page-header-program' to make page headings
  88 and print the result."
  89   :type '(repeat (string :tag "Argument"))
  90   :group 'lpr)
  91
  92 (defcustom print-region-function nil
  93   "Function to call to print the region on a printer.
  94 See definition of `print-region-1' for calling conventions."
  95   :type 'function
  96   :group 'lpr)
  97
  98 (defcustom lpr-page-header-program "pr"
  99   "*Name of program for adding page headers to a file."
 100   :type 'string
 101   :group 'lpr)
 102
 103 ;; Berkeley systems support -F, and GNU pr supports both -f and -F,
 104 ;; So it looks like -F is a better default.
 105 (defcustom lpr-page-header-switches '("-F")
 106   "*List of strings to use as options for the page-header-generating program.
 107 The variable `lpr-page-header-program' specifies the program to use."
 108   :type '(repeat string)
 109   :group 'lpr)
 110
 111 ;;;###autoload
 112 (defun lpr-buffer ()
 113   "Print buffer contents as with Unix command `lpr'.
 114 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
 115   (interactive)
 116   (print-region-1 (point-min) (point-max) lpr-switches nil))
 117
 118 ;;;###autoload
 119 (defun print-buffer ()
 120   "Print buffer contents as with Unix command `lpr -p'.
 121 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
 122   (interactive)
 123   (print-region-1 (point-min) (point-max) lpr-switches t))
 124
 125 ;;;###autoload
 126 (defun lpr-region (start end)
 127   "Print region contents as with Unix command `lpr'.
 128 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
 129   (interactive "r")
 130   (print-region-1 start end lpr-switches nil))
 131
 132 ;;;###autoload
 133 (defun print-region (start end)
 134   "Print region contents as with Unix command `lpr -p'.
 135 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
 136   (interactive "r")
 137   (print-region-1 start end lpr-switches t))
 138
 139 (defun print-region-1 (start end switches page-headers)
 140   ;; On some MIPS system, having a space in the job name
 141   ;; crashes the printer demon.  But using dashes looks ugly
 142   ;; and it seems to annoying to do for that MIPS system.
 143   (let ((name (concat (buffer-name) " Emacs buffer"))
 144         (title (concat (buffer-name) " Emacs buffer"))
 145         ;; Make pipes use the same coding system as
 146         ;; writing the buffer to a file would.
 147         (coding-system-for-write
 148          (or coding-system-for-write buffer-file-coding-system))
 149         (coding-system-for-read
 150          (or coding-system-for-read buffer-file-coding-system))
 151         (width tab-width)
 152         switch-string)
 153     (save-excursion
 154       (if page-headers
 155           (if lpr-headers-switches
 156               ;; It is possible to use an lpr option
 157               ;; to get page headers.
 158               (setq switches (append (if (stringp lpr-headers-switches)
 159                                          (list lpr-headers-switches)
 160                                         lpr-headers-switches)
 161                                      switches))))
 162       (setq switch-string
 163             (if switches (concat " with options "
 164                                  (mapconcat 'identity switches " "))
 165               ""))
 166       (message "Spooling%s..." switch-string)
 167       (if (/= tab-width 8)
 168           (let ((new-coords (print-region-new-buffer start end)))
 169             (setq start (car new-coords) end (cdr new-coords))
 170             (setq tab-width width)
 171             (save-excursion
 172               (goto-char end)
 173               (setq end (point-marker)))
 174             (untabify (point-min) (point-max))))
 175       (if page-headers
 176           (if lpr-headers-switches
 177               ;; We handled this above by modifying SWITCHES.
 178               nil
 179             ;; Run a separate program to get page headers.
 180             (let ((new-coords (print-region-new-buffer start end)))
 181               (setq start (car new-coords) end (cdr new-coords)))
 182             (apply 'call-process-region start end lpr-page-header-program
 183                                  t t nil
 184                                  (nconc (list "-h" title)
 185                                         lpr-page-header-switches))
 186             (setq start (point-min) end (point-max))))
 187       (apply (or print-region-function 'call-process-region)
 188              (nconc (list start end lpr-command
 189                           nil nil nil)
 190                     (nconc (and lpr-add-switches
 191                                 (list "-J" name))
 192                            ;; These belong in pr if we are using that.
 193                            (and lpr-add-switches lpr-headers-switches
 194                                 (list "-T" title))
 195                            (and (stringp printer-name)
 196                                 (list (concat "-P" printer-name)))
 197                            switches)))
 198       (if (markerp end)
 199           (set-marker end nil))
 200       (message "Spooling%s...done" switch-string))))
 201
 202 ;; This function copies the text between start and end
 203 ;; into a new buffer, makes that buffer current.
 204 ;; It returns the new range to print from the new current buffer
 205 ;; as (START . END).
 206
 207 (defun print-region-new-buffer (ostart oend)
 208   (if (string= (buffer-name) " *spool temp*")
 209       (cons ostart oend)
 210     (let ((oldbuf (current-buffer)))
 211       (set-buffer (get-buffer-create " *spool temp*"))
 212       (widen) (erase-buffer)
 213       (insert-buffer-substring oldbuf ostart oend)
 214       (cons (point-min) (point-max)))))
 215
 216 (defun printify-region (begin end)
 217   "Replace nonprinting characters in region with printable representations.
 218 The printable representations use ^ (for ASCII control characters) or hex.
 219 The characters tab, linefeed, space, return and formfeed are not affected."
 220   (interactive "r")
 221   (save-excursion
 222     (goto-char begin)
 223     (let (c)
 224       (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
 225         (setq c (preceding-char))
 226         (delete-backward-char 1)
 227         (insert
 228          (if (< c ?\ )
 229              (format "\\^%c" (+ c ?@))
 230            (format "\\%02x" c)))))))
 231
 232 (provide 'lpr)
 233
 234 ;;; lpr.el ends here