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 (defun printify-region (begin end)
 112   "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
 113 in the current buffer into printable representations as control or
 114 hexadecimal escapes."
 115   (interactive "r")
 116   (save-excursion
 117     (goto-char begin)
 118     (let (c)
 119       (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
 120         (setq c (preceding-char))
 121         (delete-backward-char 1)
 122         (insert
 123          (if (< c ?\ )
 124              (format "\\^%c" (+ c ?@))
 125            (format "\\%02x" c)))))))
 126
 127 ;;; lpr.el ends here