lisp/lpr.el

   1 ;;; lpr.el --- print Emacs buffer on line printer.
   2
   3 ;; Copyright (C) 1985, 1988, 1992, 1994 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 the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; Commands to send the region or a buffer your printer.  Entry points
  28 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
  29 ;; variables include `lpr-switches' and `lpr-command'.
  30
  31 ;;; Code:
  32
  33 ;;;###autoload
  34 (defvar lpr-switches nil
  35   "*List of strings to pass as extra options for the printer program.
  36 See `lpr-command'.")
  37
  38 (defvar lpr-add-switches (eq system-type 'berkeley-unix)
  39   "*Non-nil means construct -T and -J options for the printer program.
  40 These are made assuming that the program is `lpr';
  41 if you are using some other incompatible printer program,
  42 this variable should be nil.")
  43
  44 ;;;###autoload
  45 (defvar lpr-command
  46   (if (memq system-type '(usg-unix-v dgux hpux irix))
  47       "lp" "lpr")
  48   "*Name of program for printing a file.")
  49
  50 ;; Default is nil, because that enables us to use pr -f
  51 ;; which is more reliable than pr with no args, which is what lpr -p does.
  52 (defvar lpr-headers-switches nil
  53   "*List of strings of options to request page headings in the printer program.
  54 If nil, we run `lpr-page-header-program' to make page headings
  55 and print the result.")
  56
  57 (defvar print-region-function nil
  58   "Function to call to print the region on a printer.
  59 See definition of `print-region-1' for calling conventions.")
  60
  61 (defvar lpr-page-header-program "pr"
  62   "*Name of program for adding page headers to a file.")
  63
  64 (defvar lpr-page-header-switches '("-f")
  65   "*List of strings to use as options for the page-header-generating program.
  66 The variable `lpr-page-header-program' specifies the program to use.")
  67
  68 ;;;###autoload
  69 (defun lpr-buffer ()
  70   "Print buffer contents as with Unix command `lpr'.
  71 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  72   (interactive)
  73   (print-region-1 (point-min) (point-max) lpr-switches nil))
  74
  75 ;;;###autoload
  76 (defun print-buffer ()
  77   "Print buffer contents as with Unix command `lpr -p'.
  78 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  79   (interactive)
  80   (print-region-1 (point-min) (point-max) lpr-switches t))
  81
  82 ;;;###autoload
  83 (defun lpr-region (start end)
  84   "Print region contents as with Unix command `lpr'.
  85 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  86   (interactive "r")
  87   (print-region-1 start end lpr-switches nil))
  88
  89 ;;;###autoload
  90 (defun print-region (start end)
  91   "Print region contents as with Unix command `lpr -p'.
  92 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
  93   (interactive "r")
  94   (print-region-1 start end lpr-switches t))
  95
  96 (defun print-region-1 (start end switches page-headers)
  97   ;; On some MIPS system, having a space in the job name
  98   ;; crashes the printer demon.  But using dashes looks ugly
  99   ;; and it seems to annoying to do for that MIPS system.
 100   (let ((name (concat (buffer-name) " Emacs buffer"))
 101         (title (concat (buffer-name) " Emacs buffer"))
 102         (width tab-width)
 103         switch-string)
 104     (save-excursion
 105       (if page-headers
 106           (if lpr-headers-switches
 107               ;; It is possible to use an lpr option
 108               ;; to get page headers.
 109               (setq switches (append (if (stringp lpr-headers-switches)
 110                                          (list lpr-headers-switches)
 111                                         lpr-headers-switches)
 112                                      switches))))
 113       (setq switch-string
 114             (if switches (concat " with options "
 115                                  (mapconcat 'identity switches " "))
 116               ""))
 117       (message "Spooling%s..." switch-string)
 118       (if (/= tab-width 8)
 119           (let ((new-coords (print-region-new-buffer start end)))
 120             (setq start (car new-coords) end (cdr new-coords))
 121             (setq tab-width width)
 122             (save-excursion
 123               (goto-char end)
 124               (setq end (point-marker)))
 125             (untabify (point-min) (point-max))))
 126       (if page-headers
 127           (if lpr-headers-switches
 128               ;; We handled this above by modifying SWITCHES.
 129               nil
 130             ;; Run a separate program to get page headers.
 131             (let ((new-coords (print-region-new-buffer start end)))
 132               (setq start (car new-coords) end (cdr new-coords)))
 133             (apply 'call-process-region start end lpr-page-header-program
 134                                  t t nil
 135                                  (nconc (and lpr-add-switches
 136                                              (list "-h" title))
 137                                         lpr-page-header-switches))
 138             (setq start (point-min) end (point-max))))
 139       (apply (or print-region-function 'call-process-region)
 140              (nconc (list start end lpr-command
 141                           nil nil nil)
 142                     (nconc (and lpr-add-switches
 143                                 (list "-J" name))
 144                            ;; These belong in pr if we are using that.
 145                            (and lpr-add-switches lpr-headers-switches
 146                                 (list "-T" title))
 147                            switches)))
 148       (if (markerp end)
 149           (set-marker end nil))
 150       (message "Spooling%s...done" switch-string))))
 151
 152 ;; This function copies the text between start and end
 153 ;; into a new buffer, makes that buffer current.
 154 ;; It returns the new range to print from the new current buffer
 155 ;; as (START . END).
 156
 157 (defun print-region-new-buffer (ostart oend)
 158   (if (string= (buffer-name) " *spool temp*")
 159       (cons ostart oend)
 160     (let ((oldbuf (current-buffer)))
 161       (set-buffer (get-buffer-create " *spool temp*"))
 162       (widen) (erase-buffer)
 163       (insert-buffer-substring oldbuf ostart oend)
 164       (cons (point-min) (point-max)))))
 165
 166 (defun printify-region (begin end)
 167   "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
 168 in the current buffer into printable representations as control or
 169 hexadecimal escapes."
 170   (interactive "r")
 171   (save-excursion
 172     (goto-char begin)
 173     (let (c)
 174       (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
 175         (setq c (preceding-char))
 176         (delete-backward-char 1)
 177         (insert
 178          (if (< c ?\ )
 179              (format "\\^%c" (+ c ?@))
 180            (format "\\%02x" c)))))))
 181
 182 (provide 'lpr)
 183
 184 ;;; lpr.el ends here