lisp/lpr.el

   1 ;;; lpr.el --- print Emacs buffer on line printer.
   2
   3 ;; Copyright (C) 1985, 1988, 1992 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 ;;; Code:
  25
  26 ;;;###autoload
  27 (defconst lpr-switches nil "\
  28 *List of strings to pass as extra switch args to lpr when it is invoked.")
  29
  30 (defvar lpr-command (if (eq system-type 'usg-unix-v)
  31                         "lp" "lpr")
  32   "*Shell command for printing a file")
  33
  34 (defvar print-region-function nil
  35   "Function to call to print the region on a printer.
  36 See definition of `print-region-1' for calling conventions.")
  37
  38 ;;;###autoload
  39 (defun lpr-buffer ()
  40   "Print buffer contents as with Unix command `lpr'.
  41 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  42   (interactive)
  43   (print-region-1 (point-min) (point-max) lpr-switches nil))
  44
  45 ;;;###autoload
  46 (defun print-buffer ()
  47   "Print buffer contents as with Unix command `lpr -p'.
  48 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  49   (interactive)
  50   (print-region-1 (point-min) (point-max) lpr-switches t))
  51
  52 ;;;###autoload
  53 (defun lpr-region (start end)
  54   "Print region contents as with Unix command `lpr'.
  55 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  56   (interactive "r")
  57   (print-region-1 start end lpr-switches nil))
  58
  59 ;;;###autoload
  60 (defun print-region (start end)
  61   "Print region contents as with Unix command `lpr -p'.
  62 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  63   (interactive "r")
  64   (print-region-1 start end lpr-switches t))
  65
  66 (defun print-region-1 (start end switches page-headers)
  67   (let ((name (concat (buffer-name) " Emacs buffer"))
  68         (width tab-width))
  69     (save-excursion
  70       (message "Spooling...")
  71       (if (/= tab-width 8)
  72           (progn
  73             (print-region-new-buffer start end)
  74             (setq tab-width width)
  75             (untabify (point-min) (point-max))))
  76       (if page-headers
  77           (if (eq system-type 'usg-unix-v)
  78               (progn
  79                 (print-region-new-buffer start end)
  80                 (call-process-region start end "pr" t t nil))
  81             ;; On BSD, use an option to get page headers.
  82             (setq switches (cons "-p" switches))))
  83       (apply (or print-region-function 'call-process-region)
  84              (nconc (list start end lpr-command
  85                           nil nil nil)
  86                     (nconc (and (eq system-type 'berkeley-unix)
  87                                 (list "-J" name "-T" name))
  88                            switches)))
  89       (message "Spooling...done"))))
  90
  91 ;; This function copies the text between start and end
  92 ;; into a new buffer, makes that buffer current,
  93 ;; and sets start and end to the buffer bounds.
  94 ;; start and end are used free.
  95 (defun print-region-new-buffer (start end)
  96   (or (string= (buffer-name) " *spool temp*")
  97       (let ((oldbuf (current-buffer)))
  98         (set-buffer (get-buffer-create " *spool temp*"))
  99         (widen) (erase-buffer)
 100         (insert-buffer-substring oldbuf start end)
 101         (setq start (point-min) end (point-max)))))
 102
 103 ;;; lpr.el ends here