336 lines
13 KiB
EmacsLisp
336 lines
13 KiB
EmacsLisp
;;; lpr.el --- print Emacs buffer on line printer -*- lexical-binding: t -*-
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;; Copyright (C) 1985, 1988, 1992, 1994, 2001-2024 Free Software
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;; Foundation, Inc.
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;; Maintainer: emacs-devel@gnu.org
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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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Commands to send the region or a buffer to 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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;;;###autoload
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(defvar lpr-windows-system
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(memq system-type '(ms-dos windows-nt))
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"Non-nil if running on MS-DOS or MS Windows.")
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;;;###autoload
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(defvar lpr-lp-system
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(memq system-type '(usg-unix-v hpux))
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"Non-nil if running on a system type that uses the \"lp\" command.")
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(defgroup lpr nil
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"Print Emacs buffer on line printer."
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:group 'text)
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;;;###autoload
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(defcustom printer-name
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(and (eq system-type 'ms-dos) "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; otherwise the value should be nil.
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On MS-DOS and MS-Windows systems, a string value is taken as the name of
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a printer device or port, provided `lpr-command' is set to \"\".
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Typical non-default settings would be \"LPT1\" to \"LPT3\" for parallel
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printers, or \"COM1\" to \"COM4\" or \"AUX\" for serial printers, or
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\"//hostname/printer\" for a shared network printer. You can also set
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it to the name of a file, in which case the output gets appended to that
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file. If you want to discard the printed output, set this to \"NUL\"."
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:type '(choice :menu-tag "Printer Name"
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:tag "Printer Name"
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(const :tag "Default" nil)
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;; could use string but then we lose completion for files.
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(file :tag "Name")))
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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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(defcustom lpr-add-switches
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(not (not (memq system-type '(berkeley-unix gnu/linux))))
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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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(defcustom lpr-printer-switch
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(if lpr-lp-system
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"-d "
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"-P")
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"Printer switch, that is, something like \"-P\", \"-d \", \"/D:\", etc.
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This switch is used in conjunction with `printer-name'."
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:type '(choice :menu-tag "Printer Name Switch"
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:tag "Printer Name Switch"
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(const :tag "None" nil)
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(string :tag "Printer Switch")))
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;;;###autoload
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(defcustom lpr-command
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(purecopy
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(cond
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(lpr-windows-system
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"")
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(lpr-lp-system
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"lp")
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(t
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"lpr")))
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"Name of program for printing a file.
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On MS-DOS and MS-Windows systems, if the value is an empty string then
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Emacs will write directly to the printer port named by `printer-name'.
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The programs `print' and `nprint' (the standard print programs on
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Windows NT and Novell Netware respectively) are handled specially, using
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`printer-name' as the destination for output; any other program is
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treated like `lpr' except that an explicit filename is given as the last
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argument."
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:type 'string)
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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 '(choice (const nil)
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(string :tag "Single argument")
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(repeat :tag "Multiple arguments" (string :tag "Argument"))))
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(defcustom print-region-function
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(if (memq system-type '(ms-dos windows-nt))
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(progn
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(declare-function w32-direct-print-region-function "dos-w32")
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#'w32-direct-print-region-function)
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#'call-process-region)
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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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(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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;; 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 '("-h" "%s" "-F")
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"List of strings to use as options for the page-header-generating program.
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If `%s' appears in any of the strings, it is substituted by the page title.
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Note that for correct quoting, `%s' should normally be a separate element.
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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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;;;###autoload
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(defun lpr-buffer ()
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"Print buffer contents without pagination or page headers.
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See the variables `lpr-switches' and `lpr-command'
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for customization of the printer command."
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(interactive
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(unless (y-or-n-p "Send current buffer to default printer? ")
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(error "Canceled")))
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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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"Paginate and print buffer contents.
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The variable `lpr-headers-switches' controls how to paginate.
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If it is nil (the default), we run the `pr' program (or whatever program
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`lpr-page-header-program' specifies) to paginate.
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`lpr-page-header-switches' specifies the switches for that program.
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Otherwise, the switches in `lpr-headers-switches' are used
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in the print command itself; we expect them to request pagination.
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See the variables `lpr-switches' and `lpr-command'
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for further customization of the printer command."
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(interactive
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(unless (y-or-n-p "Send current buffer to default printer? ")
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(error "Canceled")))
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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 without pagination or page headers.
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See the variables `lpr-switches' and `lpr-command'
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for customization of the printer command."
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(interactive
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(if (y-or-n-p "Send selected text to default printer? ")
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(list (region-beginning) (region-end))
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(error "Canceled")))
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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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"Paginate and print the region contents.
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The variable `lpr-headers-switches' controls how to paginate.
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If it is nil (the default), we run the `pr' program (or whatever program
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`lpr-page-header-program' specifies) to paginate.
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`lpr-page-header-switches' specifies the switches for that program.
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Otherwise, the switches in `lpr-headers-switches' are used
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in the print command itself; we expect them to request pagination.
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See the variables `lpr-switches' and `lpr-command'
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for further customization of the printer command."
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(interactive
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(if (y-or-n-p "Send selected text to default printer? ")
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(list (region-beginning) (region-end))
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(error "Canceled")))
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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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(and page-headers lpr-headers-switches
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;; It's possible to use an lpr option 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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;; 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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(save-excursion
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(let ((name (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 (or coding-system-for-write
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buffer-file-coding-system))
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(coding-system-for-read (or coding-system-for-read
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buffer-file-coding-system))
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(width tab-width))
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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)
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end (cdr new-coords)
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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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(apply #'call-process-region (car new-coords) (cdr new-coords)
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lpr-page-header-program t t nil
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(mapcar (lambda (e) (format e name))
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lpr-page-header-switches)))
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(setq start (point-min)
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end (point-max))))
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(lpr-print-region start end switches name))))
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(defun lpr-print-region (start end switches name)
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(let ((buf (current-buffer))
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(nswitches (flatten-tree
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(mapcar #'lpr-eval-switch ; Dynamic evaluation
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switches)))
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(switch-string (if switches
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(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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(with-temp-buffer
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(let ((retval
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(let ((tempbuf (current-buffer)))
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(with-current-buffer buf
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(apply (or print-region-function #'call-process-region)
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start end lpr-command
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nil tempbuf nil
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(nconc (and name 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 name lpr-add-switches lpr-headers-switches
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(list "-T" name))
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(and (stringp printer-name)
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(string< "" printer-name)
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(list (concat lpr-printer-switch
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printer-name)))
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nswitches))))))
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(if (markerp end)
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(set-marker end nil))
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(funcall (if (memq retval '(nil 0)) #'message #'user-error)
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"Spooling%s...done%s%s" switch-string
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(pcase (count-lines (point-min) (point-max))
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(0 "")
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(1 ": ")
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(_ ":\n"))
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(buffer-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)
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(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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(save-restriction
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(narrow-to-region begin end)
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(goto-char (point-min))
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(let (c)
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(while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" nil t)
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(setq c (preceding-char))
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(delete-char -1)
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(insert (if (< c ?\s)
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(format "\\^%c" (+ c ?@))
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(format "\\%02x" c))))))))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Functions hacked from `ps-print' package.
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;; Dynamic evaluation
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(defun lpr-eval-switch (arg)
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(cond ((stringp arg) arg)
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((functionp arg) (funcall arg))
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((symbolp arg) (symbol-value arg))
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((consp arg) (apply (car arg) (cdr arg)))
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(t nil)))
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(define-obsolete-function-alias 'lpr-flatten-list #'flatten-tree "27.1")
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(provide 'lpr)
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;;; lpr.el ends here
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