lisp/lpr.el

   1 ;;; lpr.el --- print Emacs buffer on line printer.
   2
   3 ;; Maintainer: FSF
   4 ;; Last-Modified: 19 Apr 1992
   5 ;; Keywords: unix
   6
   7 ;; Copyright (C) 1985, 1988, 1992 Free Software Foundation, Inc.
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software; you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation; either version 2, or (at your option)
  14 ;; any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  23 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24
  25 ;;; Code:
  26
  27 ;;;###autoload
  28 (defconst lpr-switches nil "\
  29 *List of strings to pass as extra switch args to lpr when it is invoked.")
  30
  31 (defvar lpr-command (if (eq system-type 'usg-unix-v)
  32                         "lp" "lpr")
  33   "*Shell command for printing a file")
  34
  35 (defvar print-region-function nil
  36   "Function to call to print the region on a printer.
  37 See definition of `print-region-1' for calling conventions.")
  38
  39 ;;;###autoload
  40 (defun lpr-buffer ()
  41   "Print buffer contents as with Unix command `lpr'.
  42 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  43   (interactive)
  44   (print-region-1 (point-min) (point-max) lpr-switches nil))
  45
  46 ;;;###autoload
  47 (defun print-buffer ()
  48   "Print buffer contents as with Unix command `lpr -p'.
  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 t))
  52
  53 ;;;###autoload
  54 (defun lpr-region (start end)
  55   "Print region contents as with Unix command `lpr'.
  56 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  57   (interactive "r")
  58   (print-region-1 start end lpr-switches nil))
  59
  60 ;;;###autoload
  61 (defun print-region (start end)
  62   "Print region contents as with Unix command `lpr -p'.
  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 t))
  66
  67 (defun print-region-1 (start end switches page-headers)
  68   (let ((name (concat (buffer-name) " Emacs buffer"))
  69         (width tab-width))
  70     (save-excursion
  71       (message "Spooling...")
  72       (if (/= tab-width 8)
  73           (progn
  74             (print-region-new-buffer start end)
  75             (setq tab-width width)
  76             (untabify (point-min) (point-max))))
  77       (if page-headers
  78           (if (eq system-type 'usg-unix-v)
  79               (progn
  80                 (print-region-new-buffer)
  81                 (call-process-region start end "pr" t t nil))
  82             ;; On BSD, use an option to get page headers.
  83             (setq switches (cons "-p" switches))))
  84       (apply (or print-region-function 'call-process-region)
  85              (nconc (list start end lpr-command
  86                           nil nil nil)
  87                     (nconc (and (eq system-type 'berkeley-unix)
  88                                 (list "-J" name "-T" name))
  89                            switches)))
  90       (message "Spooling...done"))))
  91
  92 ;; This function copies the text between start and end
  93 ;; into a new buffer, makes that buffer current,
  94 ;; and sets start and end to the buffer bounds.
  95 ;; start and end are used free.
  96 (defun print-region-new-buffer ()
  97   (or (string= (buffer-name) " *spool temp*")
  98       (let ((oldbuf (current-buffer)))
  99         (set-buffer (get-buffer-create " *spool temp*"))
 100         (widen) (erase-buffer)
 101         (insert-buffer-substring oldbuf start end)
 102         (setq start (point-min) end (point-max)))))
 103
 104 ;;; lpr.el ends here