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