1 ;;; lpr.el --- print Emacs buffer on line printer.
3 ;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
8 ;; This file is part of GNU Emacs.
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)
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.
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.
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'.
33 (defvar lpr-switches nil
34 "*List of strings to pass as extra switch args to `lpr' when it is invoked.")
36 (defvar lpr-add-switches (eq system-type 'berkeley-unix)
37 "*Non-nil means construct -T and -J options for the `lpr'.")
41 (if (memq system-type '(usg-unix-v dgux hpux irix))
43 "*Name of program for printing a file.")
45 ;; Default is nil, because that enables us to use pr -f
46 ;; which is more reliable than pr with no args, which is what lpr -p does.
47 (defvar lpr-headers-switches nil
48 "*List of strings to use as options for `lpr' to request page headings.
49 If nil, we run `lpr-page-header-program' to make page headings
50 and print the result.")
52 (defvar print-region-function nil
53 "Function to call to print the region on a printer.
54 See definition of `print-region-1' for calling conventions.")
56 (defvar lpr-page-header-program "pr"
57 "*Name of program for adding page headers to a file.")
59 (defvar lpr-page-header-switches '("-f")
60 "*List of strings to use as options for `lpr-page-header-program'.")
64 "Print buffer contents as with Unix command `lpr'.
65 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
67 (print-region-1 (point-min) (point-max) lpr-switches nil))
70 (defun print-buffer ()
71 "Print buffer contents as with Unix command `lpr -p'.
72 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
74 (print-region-1 (point-min) (point-max) lpr-switches t))
77 (defun lpr-region (start end)
78 "Print region contents as with Unix command `lpr'.
79 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
81 (print-region-1 start end lpr-switches nil))
84 (defun print-region (start end)
85 "Print region contents as with Unix command `lpr -p'.
86 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
88 (print-region-1 start end lpr-switches t))
90 (defun print-region-1 (start end switches page-headers)
91 ;; On some MIPS system, having a space in the job name
92 ;; crashes the printer demon. But using dashes looks ugly
93 ;; and it seems to annoying to do for that MIPS system.
94 (let ((name (concat (buffer-name) " Emacs buffer"))
95 (title (concat (buffer-name) " Emacs buffer"))
100 (if lpr-headers-switches
101 ;; It is possible to use an lpr option
102 ;; to get page headers.
103 (setq switches (append (if (stringp lpr-headers-switches)
104 (list lpr-headers-switches)
105 lpr-headers-switches)
108 (if switches (concat " with options "
109 (mapconcat 'identity switches " "))
111 (message "Spooling%s..." switch-string)
113 (let ((new-coords (print-region-new-buffer start end)))
114 (setq start (car new-coords) end (cdr new-coords))
115 (setq tab-width width)
118 (setq end (point-marker)))
119 (untabify (point-min) (point-max))))
121 (if lpr-headers-switches
122 ;; We handled this above by modifying SWITCHES.
124 ;; Run a separate program to get page headers.
125 (let ((new-coords (print-region-new-buffer start end)))
126 (setq start (car new-coords) end (cdr new-coords)))
127 (apply 'call-process-region start end lpr-page-header-program
129 (nconc (and lpr-add-switches
131 lpr-page-header-switches))
132 (setq start (point-min) end (point-max))))
133 (apply (or print-region-function 'call-process-region)
134 (nconc (list start end lpr-command
136 (nconc (and lpr-add-switches
138 ;; These belong in pr if we are using that.
139 (and lpr-add-switches lpr-headers-switches
143 (set-marker end nil))
144 (message "Spooling%s...done" switch-string))))
146 ;; This function copies the text between start and end
147 ;; into a new buffer, makes that buffer current.
148 ;; It returns the new range to print from the new current buffer
151 (defun print-region-new-buffer (ostart oend)
152 (if (string= (buffer-name) " *spool temp*")
154 (let ((oldbuf (current-buffer)))
155 (set-buffer (get-buffer-create " *spool temp*"))
156 (widen) (erase-buffer)
157 (insert-buffer-substring oldbuf ostart oend)
158 (cons (point-min) (point-max)))))
160 (defun printify-region (begin end)
161 "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
162 in the current buffer into printable representations as control or
163 hexadecimal escapes."
168 (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
169 (setq c (preceding-char))
170 (delete-backward-char 1)
173 (format "\\^%c" (+ c ?@))
174 (format "\\%02x" c)))))))