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 ;;; 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 switch args to lpr when it is invoked.")
  35
  36 ;;;###autoload
  37 (defvar lpr-command
  38   (if (memq system-type '(usg-unix-v dgux-unix hpux silicon-graphics-unix))
  39       "lp" "lpr")
  40   "*Shell command for printing a file")
  41
  42 (defvar print-region-function nil
  43   "Function to call to print the region on a printer.
  44 See definition of `print-region-1' for calling conventions.")
  45
  46 ;;;###autoload
  47 (defun lpr-buffer ()
  48   "Print buffer contents as with Unix command `lpr'.
  49 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  50   (interactive)
  51   (print-region-1 (point-min) (point-max) lpr-switches nil))
  52
  53 ;;;###autoload
  54 (defun print-buffer ()
  55   "Print buffer contents as with Unix command `lpr -p'.
  56 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  57   (interactive)
  58   (print-region-1 (point-min) (point-max) lpr-switches t))
  59
  60 ;;;###autoload
  61 (defun lpr-region (start end)
  62   "Print region contents as with Unix command `lpr'.
  63 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  64   (interactive "r")
  65   (print-region-1 start end lpr-switches nil))
  66
  67 ;;;###autoload
  68 (defun print-region (start end)
  69   "Print region contents as with Unix command `lpr -p'.
  70 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  71   (interactive "r")
  72   (print-region-1 start end lpr-switches t))
  73
  74 (defun print-region-1 (start end switches page-headers)
  75   (let ((name (concat (buffer-name) " Emacs buffer"))
  76         (width tab-width))
  77     (save-excursion
  78       (message "Spooling...")
  79       (if (/= tab-width 8)
  80           (progn
  81             (print-region-new-buffer start end)
  82             (setq tab-width width)
  83             (untabify (point-min) (point-max))))
  84       (if page-headers
  85           (if (eq system-type 'usg-unix-v)
  86               (progn
  87                 (print-region-new-buffer start end)
  88                 (call-process-region start end "pr" t t nil))
  89             ;; On BSD, use an option to get page headers.
  90             (setq switches (cons "-p" switches))))
  91       (apply (or print-region-function 'call-process-region)
  92              (nconc (list start end lpr-command
  93                           nil nil nil)
  94                     (nconc (and (eq system-type 'berkeley-unix)
  95                                 (list "-J" name "-T" name))
  96                            switches)))
  97       (message "Spooling...done"))))
  98
  99 ;; This function copies the text between start and end
 100 ;; into a new buffer, makes that buffer current,
 101 ;; and sets start and end to the buffer bounds.
 102 ;; start and end are used free.
 103 (defun print-region-new-buffer (start end)
 104   (or (string= (buffer-name) " *spool temp*")
 105       (let ((oldbuf (current-buffer)))
 106         (set-buffer (get-buffer-create " *spool temp*"))
 107         (widen) (erase-buffer)
 108         (insert-buffer-substring oldbuf start end)
 109         (setq start (point-min) end (point-max)))))
 110
 111 ;;; lpr.el ends here