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233 lines
8.1 KiB
EmacsLisp
233 lines
8.1 KiB
EmacsLisp
;;; lpr.el --- print Emacs buffer on line printer.
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;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: unix
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; Commands to send the region or a buffer your printer. Entry points
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;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
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;; variables include `printer-name', `lpr-switches' and `lpr-command'.
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;;; Code:
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(defgroup lpr nil
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"Print Emacs buffer on line printer"
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:group 'wp)
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;;;###autoload
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(defcustom printer-name
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(if (memq system-type '(ms-dos windows-nt)) "PRN")
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"*The name of a local printer to which data is sent for printing.
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\(Note that PostScript files are sent to `ps-printer-name', which see.\)
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On Unix-like systems, a string value should be a name understood by
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lpr's -P option.
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On MS-DOS and MS-Windows systems, it is the name of a printer device or
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port. Typical non-default settings would be \"LPT1\" to \"LPT3\" for
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parallel printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial
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printers, or \"//hostname/printer\" for a shared network printer. You
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can also set it to a name of a file, in which case the output gets
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appended to that file. If you want to discard the printed output, set
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this to \"NUL\"."
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:type 'file ; could use string but then we lose completion for files.
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:group 'lpr)
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;;;###autoload
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(defcustom lpr-switches nil
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"*List of strings to pass as extra options for the printer program.
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It is recommended to set `printer-name' instead of including an explicit
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switch on this list.
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See `lpr-command'."
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:type '(repeat (string :tag "Argument"))
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:group 'lpr)
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(defcustom lpr-add-switches (eq system-type 'berkeley-unix)
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"*Non-nil means construct -T and -J options for the printer program.
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These are made assuming that the program is `lpr';
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if you are using some other incompatible printer program,
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this variable should be nil."
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:type 'boolean
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:group 'lpr)
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;;;###autoload
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(defcustom lpr-command
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(if (memq system-type '(usg-unix-v dgux hpux irix))
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"lp" "lpr")
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"*Name of program for printing a file."
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:type 'string
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:group 'lpr)
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;; Default is nil, because that enables us to use pr -f
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;; which is more reliable than pr with no args, which is what lpr -p does.
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(defcustom lpr-headers-switches nil
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"*List of strings of options to request page headings in the printer program.
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If nil, we run `lpr-page-header-program' to make page headings
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and print the result."
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:type '(repeat (string :tag "Argument"))
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:group 'lpr)
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(defcustom print-region-function nil
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"Function to call to print the region on a printer.
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See definition of `print-region-1' for calling conventions."
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:type 'function
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:group 'lpr)
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(defcustom lpr-page-header-program "pr"
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"*Name of program for adding page headers to a file."
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:type 'string
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:group 'lpr)
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;; Berkeley systems support -F, and GNU pr supports both -f and -F,
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;; So it looks like -F is a better default.
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(defcustom lpr-page-header-switches '("-F")
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"*List of strings to use as options for the page-header-generating program.
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The variable `lpr-page-header-program' specifies the program to use."
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:type '(repeat string)
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:group 'lpr)
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;;;###autoload
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(defun lpr-buffer ()
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"Print buffer contents as with Unix command `lpr'.
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`lpr-switches' is a list of extra switches (strings) to pass to lpr."
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(interactive)
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(print-region-1 (point-min) (point-max) lpr-switches nil))
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;;;###autoload
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(defun print-buffer ()
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"Print buffer contents as with Unix command `lpr -p'.
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`lpr-switches' is a list of extra switches (strings) to pass to lpr."
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(interactive)
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(print-region-1 (point-min) (point-max) lpr-switches t))
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;;;###autoload
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(defun lpr-region (start end)
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"Print region contents as with Unix command `lpr'.
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`lpr-switches' is a list of extra switches (strings) to pass to lpr."
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(interactive "r")
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(print-region-1 start end lpr-switches nil))
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;;;###autoload
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(defun print-region (start end)
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"Print region contents as with Unix command `lpr -p'.
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`lpr-switches' is a list of extra switches (strings) to pass to lpr."
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(interactive "r")
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(print-region-1 start end lpr-switches t))
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(defun print-region-1 (start end switches page-headers)
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;; On some MIPS system, having a space in the job name
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;; crashes the printer demon. But using dashes looks ugly
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;; and it seems to annoying to do for that MIPS system.
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(let ((name (concat (buffer-name) " Emacs buffer"))
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(title (concat (buffer-name) " Emacs buffer"))
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;; Make pipes use the same coding system as
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;; writing the buffer to a file would.
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(coding-system-for-write
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(or coding-system-for-write buffer-file-coding-system))
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(coding-system-for-read
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(or coding-system-for-read buffer-file-coding-system))
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(width tab-width)
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switch-string)
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(save-excursion
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(if page-headers
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(if lpr-headers-switches
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;; It is possible to use an lpr option
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;; to get page headers.
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(setq switches (append (if (stringp lpr-headers-switches)
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(list lpr-headers-switches)
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lpr-headers-switches)
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switches))))
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(setq switch-string
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(if switches (concat " with options "
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(mapconcat 'identity switches " "))
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""))
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(message "Spooling%s..." switch-string)
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(if (/= tab-width 8)
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(let ((new-coords (print-region-new-buffer start end)))
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(setq start (car new-coords) end (cdr new-coords))
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(setq tab-width width)
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(save-excursion
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(goto-char end)
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(setq end (point-marker)))
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(untabify (point-min) (point-max))))
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(if page-headers
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(if lpr-headers-switches
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;; We handled this above by modifying SWITCHES.
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nil
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;; Run a separate program to get page headers.
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(let ((new-coords (print-region-new-buffer start end)))
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(setq start (car new-coords) end (cdr new-coords)))
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(apply 'call-process-region start end lpr-page-header-program
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t t nil
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(nconc (list "-h" title)
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lpr-page-header-switches))
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(setq start (point-min) end (point-max))))
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(apply (or print-region-function 'call-process-region)
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(nconc (list start end lpr-command
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nil nil nil)
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(nconc (and lpr-add-switches
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(list "-J" name))
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;; These belong in pr if we are using that.
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(and lpr-add-switches lpr-headers-switches
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(list "-T" title))
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(and (stringp printer-name)
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(list (concat "-P" printer-name)))
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switches)))
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(if (markerp end)
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(set-marker end nil))
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(message "Spooling%s...done" switch-string))))
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;; This function copies the text between start and end
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;; into a new buffer, makes that buffer current.
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;; It returns the new range to print from the new current buffer
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;; as (START . END).
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(defun print-region-new-buffer (ostart oend)
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(if (string= (buffer-name) " *spool temp*")
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(cons ostart oend)
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(let ((oldbuf (current-buffer)))
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(set-buffer (get-buffer-create " *spool temp*"))
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(widen) (erase-buffer)
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(insert-buffer-substring oldbuf ostart oend)
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(cons (point-min) (point-max)))))
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(defun printify-region (begin end)
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"Replace nonprinting characters in region with printable representations.
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The printable representations use ^ (for ASCII control characters) or hex.
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The characters tab, linefeed, space, return and formfeed are not affected."
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(interactive "r")
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(save-excursion
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(goto-char begin)
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(let (c)
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(while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
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(setq c (preceding-char))
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(delete-backward-char 1)
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(insert
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(if (< c ?\ )
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(format "\\^%c" (+ c ?@))
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(format "\\%02x" c)))))))
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(provide 'lpr)
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;;; lpr.el ends here
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