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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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, 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 `printer-name', `lpr-switches' and `lpr-command'.
;;; Code:
(defgroup lpr nil
"Print Emacs buffer on line printer"
:group 'wp)
;;;###autoload
(defcustom printer-name
(if (memq system-type '(ms-dos windows-nt)) "PRN")
"*The name of a local printer to which data is sent for printing.
\(Note that PostScript files are sent to `ps-printer-name', which see.\)
On Unix-like systems, a string value should be a name understood by
lpr's -P option; otherwise the value should be nil.
On MS-DOS and MS-Windows systems, a string value is taken as the name of
a printer device or port, provided `lpr-command' is set to \"\".
Typical non-default settings would be \"LPT1\" to \"LPT3\" for parallel
printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial printers, or
\"//hostname/printer\" for a shared network printer. You can also set
it to the name of a file, in which case the output gets appended to that
file. If you want to discard the printed output, set this to \"NUL\"."
:type '(choice ; could use string but then we lose completion for files.
(file :tag "Name")
(const :tag "Default" nil))
:group 'lpr)
;;;###autoload
(defcustom lpr-switches nil
"*List of strings to pass as extra options for the printer program.
It is recommended to set `printer-name' instead of including an explicit
switch on this list.
See `lpr-command'."
:type '(repeat (string :tag "Argument"))
:group 'lpr)
(defcustom lpr-add-switches (eq system-type 'berkeley-unix)
"*Non-nil means construct -T and -J options for the printer program.
These are made assuming that the program is `lpr';
if you are using some other incompatible printer program,
this variable should be nil."
:type 'boolean
:group 'lpr)
;;;###autoload
(defcustom lpr-command
(cond
((memq system-type '(ms-dos windows-nt))
"")
((memq system-type '(usg-unix-v dgux hpux irix))
"lp")
(t
"lpr"))
"*Name of program for printing a file.
On MS-DOS and MS-Windows systems, if the value is an empty string then
Emacs will write directly to the printer port named by `printer-name'.
The programs `print' and `nprint' (the standard print programs on
Windows NT and Novell Netware respectively) are handled specially, using
`printer-name' as the destination for output; any other program is
treated like `lpr' except that an explicit filename is given as the last
argument."
:type 'string
:group 'lpr)
;; 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.
(defcustom lpr-headers-switches nil
"*List of strings of options to request page headings in the printer program.
If nil, we run `lpr-page-header-program' to make page headings
and print the result."
:type '(repeat (string :tag "Argument"))
:group 'lpr)
(defcustom print-region-function nil
"Function to call to print the region on a printer.
See definition of `print-region-1' for calling conventions."
:type 'function
:group 'lpr)
(defcustom lpr-page-header-program "pr"
"*Name of program for adding page headers to a file."
:type 'string
:group 'lpr)
;; Berkeley systems support -F, and GNU pr supports both -f and -F,
;; So it looks like -F is a better default.
(defcustom lpr-page-header-switches '("-h" "-F")
"*List of strings to use as options for the page-header-generating program.
The variable `lpr-page-header-program' specifies the program to use."
:type '(repeat string)
:group 'lpr)
;;;###autoload
(defun lpr-buffer ()
"Print buffer contents without pagination or page headers.
See the variables `lpr-switches' and `lpr-command'
for customization of the printer command."
(interactive)
(print-region-1 (point-min) (point-max) lpr-switches nil))
;;;###autoload
(defun print-buffer ()
"Paginate and print buffer contents.
The variable `lpr-headers-switches' controls how to paginate.
If it is nil (the default), we run the `pr' program (or whatever program
`lpr-page-header-program' specifies) to paginate.
`lpr-page-header-switches' specifies the switches for that program.
Otherwise, the switches in `lpr-headers-switches' are used
in the print command itself; we expect them to request pagination.
See the variables `lpr-switches' and `lpr-command'
for further customization of the printer command."
(interactive)
(print-region-1 (point-min) (point-max) lpr-switches t))
;;;###autoload
(defun lpr-region (start end)
"Print region contents without pagination or page headers.
See the variables `lpr-switches' and `lpr-command'
for customization of the printer command."
(interactive "r")
(print-region-1 start end lpr-switches nil))
;;;###autoload
(defun print-region (start end)
"Paginate and print the region contents.
The variable `lpr-headers-switches' controls how to paginate.
If it is nil (the default), we run the `pr' program (or whatever program
`lpr-page-header-program' specifies) to paginate.
`lpr-page-header-switches' specifies the switches for that program.
Otherwise, the switches in `lpr-headers-switches' are used
in the print command itself; we expect them to request pagination.
See the variables `lpr-switches' and `lpr-command'
for further customization of the printer command."
(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"))
;; Make pipes use the same coding system as
;; writing the buffer to a file would.
(coding-system-for-write
(or coding-system-for-write buffer-file-coding-system))
(coding-system-for-read
(or coding-system-for-read buffer-file-coding-system))
(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
lpr-page-header-switches)
(setq start (point-min) end (point-max))))
(let ((printer-name-switch (if (memq system-type
'(usg-unix-v dgux hpux irix))
"-d" "-P")))
(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))
(and (stringp printer-name)
(list (concat printer-name-switch
printer-name)))
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)
"Replace nonprinting characters in region with printable representations.
The printable representations use ^ (for ASCII control characters) or hex.
The characters tab, linefeed, space, return and formfeed are not affected."
(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
|
