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|
;;; lpr.el --- print Emacs buffer on line printer.
;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: unix
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; Commands to send the region or a buffer your printer. Entry points
;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
;; variables include `lpr-switches' and `lpr-command'.
;;; Code:
;;;###autoload
(defvar lpr-switches nil
"*List of strings to pass as extra switch args to `lpr' when it is invoked.")
(defvar lpr-add-switches (eq system-type 'berkeley-unix)
"*Non-nil means construct -T and -J options for the `lpr'.")
;;;###autoload
(defvar lpr-command
(if (memq system-type '(usg-unix-v dgux hpux irix))
"lp" "lpr")
"*Name of program for printing a file.")
;; Default is nil, because that enables us to use pr -f
;; which is more reliable than pr with no args, which is what lpr -p does.
(defvar lpr-headers-switches nil
"*List of strings to use as options for `lpr' to request page headings.
If nil, we run `lpr-page-header-program' to make page headings
and print the result.")
(defvar print-region-function nil
"Function to call to print the region on a printer.
See definition of `print-region-1' for calling conventions.")
(defvar lpr-page-header-program "pr"
"*Name of program for adding page headers to a file.")
(defvar lpr-page-header-switches '("-f")
"*List of strings to use as options for `lpr-page-header-program'.")
;;;###autoload
(defun lpr-buffer ()
"Print buffer contents as with Unix command `lpr'.
`lpr-switches' is a list of extra switches (strings) to pass to lpr."
(interactive)
(print-region-1 (point-min) (point-max) lpr-switches nil))
;;;###autoload
(defun print-buffer ()
"Print buffer contents as with Unix command `lpr -p'.
`lpr-switches' is a list of extra switches (strings) to pass to lpr."
(interactive)
(print-region-1 (point-min) (point-max) lpr-switches t))
;;;###autoload
(defun lpr-region (start end)
"Print region contents as with Unix command `lpr'.
`lpr-switches' is a list of extra switches (strings) to pass to lpr."
(interactive "r")
(print-region-1 start end lpr-switches nil))
;;;###autoload
(defun print-region (start end)
"Print region contents as with Unix command `lpr -p'.
`lpr-switches' is a list of extra switches (strings) to pass to lpr."
(interactive "r")
(print-region-1 start end lpr-switches t))
(defun print-region-1 (start end switches page-headers)
;; On some MIPS system, having a space in the job name
;; crashes the printer demon. But using dashes looks ugly
;; and it seems to annoying to do for that MIPS system.
(let ((name (concat (buffer-name) " Emacs buffer"))
(title (concat (buffer-name) " Emacs buffer"))
(width tab-width)
switch-string)
(save-excursion
(if page-headers
(if lpr-headers-switches
;; It is possible to use an lpr option
;; to get page headers.
(setq switches (append (if (stringp lpr-headers-switches)
(list lpr-headers-switches)
lpr-headers-switches)
switches))))
(setq switch-string
(if switches (concat " with options "
(mapconcat 'identity switches " "))
""))
(message "Spooling%s..." switch-string)
(if (/= tab-width 8)
(let ((new-coords (print-region-new-buffer start end)))
(setq start (car new-coords) end (cdr new-coords))
(setq tab-width width)
(save-excursion
(goto-char end)
(setq end (point-marker)))
(untabify (point-min) (point-max))))
(if page-headers
(if lpr-headers-switches
;; We handled this above by modifying SWITCHES.
nil
;; Run a separate program to get page headers.
(let ((new-coords (print-region-new-buffer start end)))
(setq start (car new-coords) end (cdr new-coords)))
(apply 'call-process-region start end lpr-page-header-program
t t nil
(nconc (and lpr-add-switches
(list "-h" title))
lpr-page-header-switches))
(setq start (point-min) end (point-max))))
(apply (or print-region-function 'call-process-region)
(nconc (list start end lpr-command
nil nil nil)
(nconc (and lpr-add-switches
(list "-J" name))
;; These belong in pr if we are using that.
(and lpr-add-switches lpr-headers-switches
(list "-T" title))
switches)))
(if (markerp end)
(set-marker end nil))
(message "Spooling%s...done" switch-string))))
;; This function copies the text between start and end
;; into a new buffer, makes that buffer current.
;; It returns the new range to print from the new current buffer
;; as (START . END).
(defun print-region-new-buffer (ostart oend)
(if (string= (buffer-name) " *spool temp*")
(cons ostart oend)
(let ((oldbuf (current-buffer)))
(set-buffer (get-buffer-create " *spool temp*"))
(widen) (erase-buffer)
(insert-buffer-substring oldbuf ostart oend)
(cons (point-min) (point-max)))))
(defun printify-region (begin end)
"Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
in the current buffer into printable representations as control or
hexadecimal escapes."
(interactive "r")
(save-excursion
(goto-char begin)
(let (c)
(while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
(setq c (preceding-char))
(delete-backward-char 1)
(insert
(if (< c ?\ )
(format "\\^%c" (+ c ?@))
(format "\\%02x" c)))))))
(provide 'lpr)
;;; lpr.el ends here
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