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
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Commentary:
  25
  26 ;; Commands to send the region or a buffer your printer.  Entry points
  27 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
  28 ;; variables include `lpr-switches' and `lpr-command'.
  29
  30 ;;; Code:
  31
  32 ;;;###autoload
  33 (defvar lpr-switches nil
  34   "*List of strings to pass as extra options for the printer program.
  35 See `lpr-command'.")
  36
  37 (defvar lpr-add-switches (eq system-type 'berkeley-unix)
  38   "*Non-nil means construct -T and -J options for the printer program.
  39 These are made assuming that the program is `lpr';
  40 if you are using some other incompatible printer program,
  41 this variable should be nil.")
  42
  43 ;;;###autoload
  44 (defvar lpr-command
  45   (if (memq system-type '(usg-unix-v dgux hpux irix))
  46       "lp" "lpr")
  47   "*Name of program for printing a file.")
  48
  49 ;; Default is nil, because that enables us to use pr -f
  50 ;; which is more reliable than pr with no args, which is what lpr -p does.
  51 (defvar lpr-headers-switches nil
  52   "*List of strings of options to request page headings in the printer program.
  53 If nil, we run `lpr-page-header-program' to make page headings
  54 and print the result.")
  55
  56 (defvar print-region-function nil
  57   "Function to call to print the region on a printer.
  58 See definition of `print-region-1' for calling conventions.")
  59
  60 (defvar lpr-page-header-program "pr"
  61   "*Name of program for adding page headers to a file.")
  62
  63 (defvar lpr-page-header-switches '("-f")
  64   "*List of strings to use as options for the page-header-generating program.
  65 The variable `lpr-page-header-program' specifies the program to use.")
  66
  67 ;;;###autoload
  68 (defun lpr-buffer ()
  69   "Print buffer contents as with Unix command `lpr'.
  70 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  71   (interactive)
  72   (print-region-1 (point-min) (point-max) lpr-switches nil))
  73
  74 ;;;###autoload
  75 (defun print-buffer ()
  76   "Print buffer contents as with Unix command `lpr -p'.
  77 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  78   (interactive)
  79   (print-region-1 (point-min) (point-max) lpr-switches t))
  80
  81 ;;;###autoload
  82 (defun lpr-region (start end)
  83   "Print region contents as with Unix command `lpr'.
  84 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  85   (interactive "r")
  86   (print-region-1 start end lpr-switches nil))
  87
  88 ;;;###autoload
  89 (defun print-region (start end)
  90   "Print region contents as with Unix command `lpr -p'.
  91 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  92   (interactive "r")
  93   (print-region-1 start end lpr-switches t))
  94
  95 (defun print-region-1 (start end switches page-headers)
  96   ;; On some MIPS system, having a space in the job name
  97   ;; crashes the printer demon.  But using dashes looks ugly
  98   ;; and it seems to annoying to do for that MIPS system.
  99   (let ((name (concat (buffer-name) " Emacs buffer"))
 100         (title (concat (buffer-name) " Emacs buffer"))
 101         (width tab-width)
 102         switch-string)
 103     (save-excursion
 104       (if page-headers
 105           (if lpr-headers-switches
 106               ;; It is possible to use an lpr option
 107               ;; to get page headers.
 108               (setq switches (append (if (stringp lpr-headers-switches)
 109                                          (list lpr-headers-switches)
 110                                         lpr-headers-switches)
 111                                      switches))))
 112       (setq switch-string
 113             (if switches (concat " with options "
 114                                  (mapconcat 'identity switches " "))
 115               ""))
 116       (message "Spooling%s..." switch-string)
 117       (if (/= tab-width 8)
 118           (let ((new-coords (print-region-new-buffer start end)))
 119             (setq start (car new-coords) end (cdr new-coords))
 120             (setq tab-width width)
 121             (save-excursion
 122               (goto-char end)
 123               (setq end (point-marker)))
 124             (untabify (point-min) (point-max))))
 125       (if page-headers
 126           (if lpr-headers-switches
 127               ;; We handled this above by modifying SWITCHES.
 128               nil
 129             ;; Run a separate program to get page headers.
 130             (let ((new-coords (print-region-new-buffer start end)))
 131               (setq start (car new-coords) end (cdr new-coords)))
 132             (apply 'call-process-region start end lpr-page-header-program
 133                                  t t nil
 134                                  (nconc (and lpr-add-switches
 135                                              (list "-h" title))
 136                                         lpr-page-header-switches))
 137             (setq start (point-min) end (point-max))))
 138       (apply (or print-region-function 'call-process-region)
 139              (nconc (list start end lpr-command
 140                           nil nil nil)
 141                     (nconc (and lpr-add-switches
 142                                 (list "-J" name))
 143                            ;; These belong in pr if we are using that.
 144                            (and lpr-add-switches lpr-headers-switches
 145                                 (list "-T" title))
 146                            switches)))
 147       (if (markerp end)
 148           (set-marker end nil))
 149       (message "Spooling%s...done" switch-string))))
 150
 151 ;; This function copies the text between start and end
 152 ;; into a new buffer, makes that buffer current.
 153 ;; It returns the new range to print from the new current buffer
 154 ;; as (START . END).
 155
 156 (defun print-region-new-buffer (ostart oend)
 157   (if (string= (buffer-name) " *spool temp*")
 158       (cons ostart oend)
 159     (let ((oldbuf (current-buffer)))
 160       (set-buffer (get-buffer-create " *spool temp*"))
 161       (widen) (erase-buffer)
 162       (insert-buffer-substring oldbuf ostart oend)
 163       (cons (point-min) (point-max)))))
 164
 165 (defun printify-region (begin end)
 166   "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
 167 in the current buffer into printable representations as control or
 168 hexadecimal escapes."
 169   (interactive "r")
 170   (save-excursion
 171     (goto-char begin)
 172     (let (c)
 173       (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
 174         (setq c (preceding-char))
 175         (delete-backward-char 1)
 176         (insert
 177          (if (< c ?\ )
 178              (format "\\^%c" (+ c ?@))
 179            (format "\\%02x" c)))))))
 180
 181 (provide 'lpr)
 182
 183 ;;; lpr.el ends here