| 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 `printer-name', `lpr-switches' and `lpr-command'. |
| 30 | |
| 31 | ;;; Code: |
| 32 | |
| 33 | (defgroup lpr nil |
| 34 | "Print Emacs buffer on line printer" |
| 35 | :group 'wp) |
| 36 | |
| 37 | ;;;###autoload |
| 38 | (defcustom printer-name |
| 39 | (if (memq system-type '(ms-dos windows-nt)) "PRN") |
| 40 | "*The name of a local printer to which data is sent for printing. |
| 41 | \(Note that PostScript files are sent to `ps-printer-name', which see.\) |
| 42 | |
| 43 | On Unix-like systems, a string value should be a name understood by |
| 44 | lpr's -P option; otherwise the value should be nil. |
| 45 | |
| 46 | On MS-DOS and MS-Windows systems, a string value is taken as the name of |
| 47 | a printer device or port, provided `lpr-command' is set to \"\". |
| 48 | Typical non-default settings would be \"LPT1\" to \"LPT3\" for parallel |
| 49 | printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial printers, or |
| 50 | \"//hostname/printer\" for a shared network printer. You can also set |
| 51 | it to the name of a file, in which case the output gets appended to that |
| 52 | file. If you want to discard the printed output, set this to \"NUL\"." |
| 53 | :type '(choice ; could use string but then we lose completion for files. |
| 54 | (file :tag "Name") |
| 55 | (const :tag "Default" nil)) |
| 56 | :group 'lpr) |
| 57 | |
| 58 | ;;;###autoload |
| 59 | (defcustom lpr-switches nil |
| 60 | "*List of strings to pass as extra options for the printer program. |
| 61 | It is recommended to set `printer-name' instead of including an explicit |
| 62 | switch on this list. |
| 63 | See `lpr-command'." |
| 64 | :type '(repeat (string :tag "Argument")) |
| 65 | :group 'lpr) |
| 66 | |
| 67 | (defcustom lpr-add-switches (eq system-type 'berkeley-unix) |
| 68 | "*Non-nil means construct -T and -J options for the printer program. |
| 69 | These are made assuming that the program is `lpr'; |
| 70 | if you are using some other incompatible printer program, |
| 71 | this variable should be nil." |
| 72 | :type 'boolean |
| 73 | :group 'lpr) |
| 74 | |
| 75 | ;;;###autoload |
| 76 | (defcustom lpr-command |
| 77 | (cond |
| 78 | ((memq system-type '(ms-dos windows-nt)) |
| 79 | "") |
| 80 | ((memq system-type '(usg-unix-v dgux hpux irix)) |
| 81 | "lp") |
| 82 | (t |
| 83 | "lpr")) |
| 84 | "*Name of program for printing a file. |
| 85 | |
| 86 | On MS-DOS and MS-Windows systems, if the value is an empty string then |
| 87 | Emacs will write directly to the printer port named by `printer-name'. |
| 88 | The programs `print' and `nprint' (the standard print programs on |
| 89 | Windows NT and Novell Netware respectively) are handled specially, using |
| 90 | `printer-name' as the destination for output; any other program is |
| 91 | treated like `lpr' except that an explicit filename is given as the last |
| 92 | argument." |
| 93 | :type 'string |
| 94 | :group 'lpr) |
| 95 | |
| 96 | ;; Default is nil, because that enables us to use pr -f |
| 97 | ;; which is more reliable than pr with no args, which is what lpr -p does. |
| 98 | (defcustom lpr-headers-switches nil |
| 99 | "*List of strings of options to request page headings in the printer program. |
| 100 | If nil, we run `lpr-page-header-program' to make page headings |
| 101 | and print the result." |
| 102 | :type '(repeat (string :tag "Argument")) |
| 103 | :group 'lpr) |
| 104 | |
| 105 | (defcustom print-region-function nil |
| 106 | "Function to call to print the region on a printer. |
| 107 | See definition of `print-region-1' for calling conventions." |
| 108 | :type 'function |
| 109 | :group 'lpr) |
| 110 | |
| 111 | (defcustom lpr-page-header-program "pr" |
| 112 | "*Name of program for adding page headers to a file." |
| 113 | :type 'string |
| 114 | :group 'lpr) |
| 115 | |
| 116 | ;; Berkeley systems support -F, and GNU pr supports both -f and -F, |
| 117 | ;; So it looks like -F is a better default. |
| 118 | (defcustom lpr-page-header-switches '("-h" "-F") |
| 119 | "*List of strings to use as options for the page-header-generating program. |
| 120 | The variable `lpr-page-header-program' specifies the program to use." |
| 121 | :type '(repeat string) |
| 122 | :group 'lpr) |
| 123 | |
| 124 | ;;;###autoload |
| 125 | (defun lpr-buffer () |
| 126 | "Print buffer contents without pagination or page headers. |
| 127 | See the variables `lpr-switches' and `lpr-command' |
| 128 | for customization of the printer command." |
| 129 | (interactive) |
| 130 | (print-region-1 (point-min) (point-max) lpr-switches nil)) |
| 131 | |
| 132 | ;;;###autoload |
| 133 | (defun print-buffer () |
| 134 | "Paginate and print buffer contents. |
| 135 | |
| 136 | The variable `lpr-headers-switches' controls how to paginate. |
| 137 | If it is nil (the default), we run the `pr' program (or whatever program |
| 138 | `lpr-page-header-program' specifies) to paginate. |
| 139 | `lpr-page-header-switches' specifies the switches for that program. |
| 140 | |
| 141 | Otherwise, the switches in `lpr-headers-switches' are used |
| 142 | in the print command itself; we expect them to request pagination. |
| 143 | |
| 144 | See the variables `lpr-switches' and `lpr-command' |
| 145 | for further customization of the printer command." |
| 146 | (interactive) |
| 147 | (print-region-1 (point-min) (point-max) lpr-switches t)) |
| 148 | |
| 149 | ;;;###autoload |
| 150 | (defun lpr-region (start end) |
| 151 | "Print region contents without pagination or page headers. |
| 152 | See the variables `lpr-switches' and `lpr-command' |
| 153 | for customization of the printer command." |
| 154 | (interactive "r") |
| 155 | (print-region-1 start end lpr-switches nil)) |
| 156 | |
| 157 | ;;;###autoload |
| 158 | (defun print-region (start end) |
| 159 | "Paginate and print the region contents. |
| 160 | |
| 161 | The variable `lpr-headers-switches' controls how to paginate. |
| 162 | If it is nil (the default), we run the `pr' program (or whatever program |
| 163 | `lpr-page-header-program' specifies) to paginate. |
| 164 | `lpr-page-header-switches' specifies the switches for that program. |
| 165 | |
| 166 | Otherwise, the switches in `lpr-headers-switches' are used |
| 167 | in the print command itself; we expect them to request pagination. |
| 168 | |
| 169 | See the variables `lpr-switches' and `lpr-command' |
| 170 | for further customization of the printer command." |
| 171 | (interactive "r") |
| 172 | (print-region-1 start end lpr-switches t)) |
| 173 | |
| 174 | (defun print-region-1 (start end switches page-headers) |
| 175 | ;; On some MIPS system, having a space in the job name |
| 176 | ;; crashes the printer demon. But using dashes looks ugly |
| 177 | ;; and it seems to annoying to do for that MIPS system. |
| 178 | (let ((name (concat (buffer-name) " Emacs buffer")) |
| 179 | (title (concat (buffer-name) " Emacs buffer")) |
| 180 | ;; Make pipes use the same coding system as |
| 181 | ;; writing the buffer to a file would. |
| 182 | (coding-system-for-write |
| 183 | (or coding-system-for-write buffer-file-coding-system)) |
| 184 | (coding-system-for-read |
| 185 | (or coding-system-for-read buffer-file-coding-system)) |
| 186 | (width tab-width) |
| 187 | switch-string) |
| 188 | (save-excursion |
| 189 | (if page-headers |
| 190 | (if lpr-headers-switches |
| 191 | ;; It is possible to use an lpr option |
| 192 | ;; to get page headers. |
| 193 | (setq switches (append (if (stringp lpr-headers-switches) |
| 194 | (list lpr-headers-switches) |
| 195 | lpr-headers-switches) |
| 196 | switches)))) |
| 197 | (setq switch-string |
| 198 | (if switches (concat " with options " |
| 199 | (mapconcat 'identity switches " ")) |
| 200 | "")) |
| 201 | (message "Spooling%s..." switch-string) |
| 202 | (if (/= tab-width 8) |
| 203 | (let ((new-coords (print-region-new-buffer start end))) |
| 204 | (setq start (car new-coords) end (cdr new-coords)) |
| 205 | (setq tab-width width) |
| 206 | (save-excursion |
| 207 | (goto-char end) |
| 208 | (setq end (point-marker))) |
| 209 | (untabify (point-min) (point-max)))) |
| 210 | (if page-headers |
| 211 | (if lpr-headers-switches |
| 212 | ;; We handled this above by modifying SWITCHES. |
| 213 | nil |
| 214 | ;; Run a separate program to get page headers. |
| 215 | (let ((new-coords (print-region-new-buffer start end))) |
| 216 | (setq start (car new-coords) end (cdr new-coords))) |
| 217 | (apply 'call-process-region start end lpr-page-header-program |
| 218 | t t nil |
| 219 | lpr-page-header-switches) |
| 220 | (setq start (point-min) end (point-max)))) |
| 221 | (let ((printer-name-switch (if (memq system-type |
| 222 | '(usg-unix-v dgux hpux irix)) |
| 223 | "-d" "-P"))) |
| 224 | (apply (or print-region-function 'call-process-region) |
| 225 | (nconc (list start end lpr-command |
| 226 | nil nil nil) |
| 227 | (nconc (and lpr-add-switches |
| 228 | (list "-J" name)) |
| 229 | ;; These belong in pr if we are using that. |
| 230 | (and lpr-add-switches lpr-headers-switches |
| 231 | (list "-T" title)) |
| 232 | (and (stringp printer-name) |
| 233 | (list (concat printer-name-switch |
| 234 | printer-name))) |
| 235 | switches)))) |
| 236 | (if (markerp end) |
| 237 | (set-marker end nil)) |
| 238 | (message "Spooling%s...done" switch-string)))) |
| 239 | |
| 240 | ;; This function copies the text between start and end |
| 241 | ;; into a new buffer, makes that buffer current. |
| 242 | ;; It returns the new range to print from the new current buffer |
| 243 | ;; as (START . END). |
| 244 | |
| 245 | (defun print-region-new-buffer (ostart oend) |
| 246 | (if (string= (buffer-name) " *spool temp*") |
| 247 | (cons ostart oend) |
| 248 | (let ((oldbuf (current-buffer))) |
| 249 | (set-buffer (get-buffer-create " *spool temp*")) |
| 250 | (widen) (erase-buffer) |
| 251 | (insert-buffer-substring oldbuf ostart oend) |
| 252 | (cons (point-min) (point-max))))) |
| 253 | |
| 254 | (defun printify-region (begin end) |
| 255 | "Replace nonprinting characters in region with printable representations. |
| 256 | The printable representations use ^ (for ASCII control characters) or hex. |
| 257 | The characters tab, linefeed, space, return and formfeed are not affected." |
| 258 | (interactive "r") |
| 259 | (save-excursion |
| 260 | (goto-char begin) |
| 261 | (let (c) |
| 262 | (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t) |
| 263 | (setq c (preceding-char)) |
| 264 | (delete-backward-char 1) |
| 265 | (insert |
| 266 | (if (< c ?\ ) |
| 267 | (format "\\^%c" (+ c ?@)) |
| 268 | (format "\\%02x" c))))))) |
| 269 | |
| 270 | (provide 'lpr) |
| 271 | |
| 272 | ;;; lpr.el ends here |