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1 ;;; lpr.el --- print Emacs buffer on line printer.
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2
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3 ;; Copyright (C) 1985, 1988, 1992, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: unix
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; Commands to send the region or a buffer your printer. Entry points
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30 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
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31 ;; variables include `lpr-switches' and `lpr-command'.
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32
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33 ;;; Code:
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34
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35 ;;;###autoload
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36 (defvar lpr-switches nil
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37 "*List of strings to pass as extra options for the printer program.
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38 See `lpr-command'.")
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39
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40 (defvar lpr-add-switches (eq system-type 'berkeley-unix)
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41 "*Non-nil means construct -T and -J options for the printer program.
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42 These are made assuming that the program is `lpr';
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43 if you are using some other incompatible printer program,
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44 this variable should be nil.")
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45
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46 ;;;###autoload
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47 (defvar lpr-command
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48 (if (memq system-type '(usg-unix-v dgux hpux irix))
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49 "lp" "lpr")
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50 "*Name of program for printing a file.")
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51
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52 ;; Default is nil, because that enables us to use pr -f
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53 ;; which is more reliable than pr with no args, which is what lpr -p does.
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54 (defvar lpr-headers-switches nil
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55 "*List of strings of options to request page headings in the printer program.
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56 If nil, we run `lpr-page-header-program' to make page headings
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57 and print the result.")
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58
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59 (defvar print-region-function nil
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60 "Function to call to print the region on a printer.
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61 See definition of `print-region-1' for calling conventions.")
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62
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63 (defvar lpr-page-header-program "pr"
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64 "*Name of program for adding page headers to a file.")
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65
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66 (defvar lpr-page-header-switches '("-f")
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67 "*List of strings to use as options for the page-header-generating program.
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68 The variable `lpr-page-header-program' specifies the program to use.")
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69
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70 ;;;###autoload
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71 (defun lpr-buffer ()
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72 "Print buffer contents as with Unix command `lpr'.
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73 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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74 (interactive)
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75 (print-region-1 (point-min) (point-max) lpr-switches nil))
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76
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77 ;;;###autoload
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78 (defun print-buffer ()
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79 "Print buffer contents as with Unix command `lpr -p'.
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80 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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81 (interactive)
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82 (print-region-1 (point-min) (point-max) lpr-switches t))
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83
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84 ;;;###autoload
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85 (defun lpr-region (start end)
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86 "Print region contents as with Unix command `lpr'.
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87 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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88 (interactive "r")
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89 (print-region-1 start end lpr-switches nil))
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90
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91 ;;;###autoload
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92 (defun print-region (start end)
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93 "Print region contents as with Unix command `lpr -p'.
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94 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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95 (interactive "r")
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96 (print-region-1 start end lpr-switches t))
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97
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98 (defun print-region-1 (start end switches page-headers)
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99 ;; On some MIPS system, having a space in the job name
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100 ;; crashes the printer demon. But using dashes looks ugly
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101 ;; and it seems to annoying to do for that MIPS system.
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102 (let ((name (concat (buffer-name) " Emacs buffer"))
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103 (title (concat (buffer-name) " Emacs buffer"))
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104 ;; On MS-DOS systems, make pipes use binary mode if the
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105 ;; original file is binary.
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106 (binary-process-input buffer-file-type)
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107 (binary-process-output buffer-file-type)
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108 (width tab-width)
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109 switch-string)
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110 (save-excursion
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111 (if page-headers
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112 (if lpr-headers-switches
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113 ;; It is possible to use an lpr option
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114 ;; to get page headers.
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115 (setq switches (append (if (stringp lpr-headers-switches)
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116 (list lpr-headers-switches)
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117 lpr-headers-switches)
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118 switches))))
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119 (setq switch-string
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120 (if switches (concat " with options "
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121 (mapconcat 'identity switches " "))
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122 ""))
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123 (message "Spooling%s..." switch-string)
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124 (if (/= tab-width 8)
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125 (let ((new-coords (print-region-new-buffer start end)))
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126 (setq start (car new-coords) end (cdr new-coords))
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127 (setq tab-width width)
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128 (save-excursion
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129 (goto-char end)
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130 (setq end (point-marker)))
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131 (untabify (point-min) (point-max))))
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132 (if page-headers
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133 (if lpr-headers-switches
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134 ;; We handled this above by modifying SWITCHES.
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135 nil
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136 ;; Run a separate program to get page headers.
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137 (let ((new-coords (print-region-new-buffer start end)))
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138 (setq start (car new-coords) end (cdr new-coords)))
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139 (apply 'call-process-region start end lpr-page-header-program
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140 t t nil
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141 (nconc (and lpr-add-switches
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142 (list "-h" title))
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143 lpr-page-header-switches))
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144 (setq start (point-min) end (point-max))))
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145 (apply (or print-region-function 'call-process-region)
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146 (nconc (list start end lpr-command
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147 nil nil nil)
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148 (nconc (and lpr-add-switches
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149 (list "-J" name))
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150 ;; These belong in pr if we are using that.
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151 (and lpr-add-switches lpr-headers-switches
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152 (list "-T" title))
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153 switches)))
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154 (if (markerp end)
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155 (set-marker end nil))
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156 (message "Spooling%s...done" switch-string))))
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157
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158 ;; This function copies the text between start and end
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159 ;; into a new buffer, makes that buffer current.
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160 ;; It returns the new range to print from the new current buffer
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161 ;; as (START . END).
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162
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163 (defun print-region-new-buffer (ostart oend)
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164 (if (string= (buffer-name) " *spool temp*")
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165 (cons ostart oend)
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166 (let ((oldbuf (current-buffer)))
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167 (set-buffer (get-buffer-create " *spool temp*"))
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168 (widen) (erase-buffer)
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169 (insert-buffer-substring oldbuf ostart oend)
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170 (cons (point-min) (point-max)))))
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171
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172 (defun printify-region (begin end)
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173 "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
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174 in the current buffer into printable representations as control or
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175 hexadecimal escapes."
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176 (interactive "r")
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177 (save-excursion
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178 (goto-char begin)
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179 (let (c)
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180 (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
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181 (setq c (preceding-char))
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182 (delete-backward-char 1)
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183 (insert
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184 (if (< c ?\ )
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185 (format "\\^%c" (+ c ?@))
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186 (format "\\%02x" c)))))))
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187
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188 (provide 'lpr)
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189
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190 ;;; lpr.el ends here
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