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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, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; Commands to send the region or a buffer your printer. Entry points
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29 ;; are `lpr-buffer', `print-buffer', lpr-region', or `print-region'; option
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30 ;; variables include `lpr-switches' and `lpr-command'.
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31
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32 ;;; Code:
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33
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34 ;;;###autoload
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35 (defvar lpr-switches nil
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36 "*List of strings to pass as extra switch args to `lpr' when it is invoked.")
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37
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38 (defvar lpr-add-switches (eq system-type 'berkeley-unix)
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39 "*Non-nil means construct -T and -J options for the `lpr'.")
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40
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41 ;;;###autoload
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42 (defvar lpr-command
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43 (if (memq system-type '(usg-unix-v dgux hpux irix))
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44 "lp" "lpr")
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45 "*Name of program for printing a file.")
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46
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47 ;; Default is nil, because that enables us to use pr -f
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48 ;; which is more reliable than pr with no args, which is what lpr -p does.
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49 (defvar lpr-headers-switches nil
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50 "*List of strings to use as options for `lpr' to request page headings.
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51 If nil, we run `lpr-page-header-program' to make page headings
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52 and print the result.")
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53
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54 (defvar print-region-function nil
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55 "Function to call to print the region on a printer.
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56 See definition of `print-region-1' for calling conventions.")
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57
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58 (defvar lpr-page-header-program "pr"
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59 "*Name of program for adding page headers to a file.")
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60
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61 (defvar lpr-page-header-switches '("-f")
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62 "*List of strings to use as options for `lpr-page-header-program'.")
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63
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64 ;;;###autoload
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65 (defun lpr-buffer ()
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66 "Print buffer contents as with Unix command `lpr'.
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67 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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68 (interactive)
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69 (print-region-1 (point-min) (point-max) lpr-switches nil))
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70
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71 ;;;###autoload
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72 (defun print-buffer ()
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73 "Print buffer contents as with Unix command `lpr -p'.
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74 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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75 (interactive)
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76 (print-region-1 (point-min) (point-max) lpr-switches t))
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77
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78 ;;;###autoload
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79 (defun lpr-region (start end)
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80 "Print region contents as with Unix command `lpr'.
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81 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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82 (interactive "r")
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83 (print-region-1 start end lpr-switches nil))
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84
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85 ;;;###autoload
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86 (defun print-region (start end)
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87 "Print region contents as with Unix command `lpr -p'.
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88 `lpr-switches' is a list of extra switches (strings) to pass to lpr."
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89 (interactive "r")
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90 (print-region-1 start end lpr-switches t))
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91
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92 (defun print-region-1 (start end switches page-headers)
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93 ;; On some MIPS system, having a space in the job name
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94 ;; crashes the printer demon. But using dashes looks ugly
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95 ;; and it seems to annoying to do for that MIPS system.
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96 (let ((name (concat (buffer-name) " Emacs buffer"))
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97 (title (concat (buffer-name) " Emacs buffer"))
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98 (width tab-width)
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99 switch-string)
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100 (save-excursion
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101 (if page-headers
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102 (if lpr-headers-switches
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103 ;; It is possible to use an lpr option
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104 ;; to get page headers.
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105 (setq switches (append (if (stringp lpr-headers-switches)
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106 (list lpr-headers-switches)
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107 lpr-headers-switches)
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108 switches))))
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109 (setq switch-string
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110 (if switches (concat " with options "
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111 (mapconcat 'identity switches " "))
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112 ""))
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113 (message "Spooling%s..." switch-string)
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114 (if (/= tab-width 8)
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115 (let ((new-coords (print-region-new-buffer start end)))
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116 (setq start (car new-coords) end (cdr new-coords))
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117 (setq tab-width width)
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118 (save-excursion
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119 (goto-char end)
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120 (setq end (point-marker)))
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121 (untabify (point-min) (point-max))))
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122 (if page-headers
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123 (if lpr-headers-switches
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124 ;; We handled this above by modifying SWITCHES.
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125 nil
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126 ;; Run a separate program to get page headers.
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127 (let ((new-coords (print-region-new-buffer start end)))
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128 (setq start (car new-coords) end (cdr new-coords)))
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129 (apply 'call-process-region start end lpr-page-header-program
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130 t t nil
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131 (nconc (and lpr-add-switches
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132 (list "-h" title))
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133 lpr-page-header-switches))
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134 (setq start (point-min) end (point-max))))
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135 (apply (or print-region-function 'call-process-region)
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136 (nconc (list start end lpr-command
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137 nil nil nil)
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138 (nconc (and lpr-add-switches
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139 (list "-J" name))
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140 ;; These belong in pr if we are using that.
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141 (and lpr-add-switches lpr-headers-switches
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142 (list "-T" title))
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143 switches)))
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144 (if (markerp end)
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145 (set-marker end nil))
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146 (message "Spooling%s...done" switch-string))))
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147
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148 ;; This function copies the text between start and end
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149 ;; into a new buffer, makes that buffer current.
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150 ;; It returns the new range to print from the new current buffer
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151 ;; as (START . END).
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152
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153 (defun print-region-new-buffer (ostart oend)
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154 (if (string= (buffer-name) " *spool temp*")
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155 (cons ostart oend)
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156 (let ((oldbuf (current-buffer)))
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157 (set-buffer (get-buffer-create " *spool temp*"))
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158 (widen) (erase-buffer)
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159 (insert-buffer-substring oldbuf ostart oend)
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160 (cons (point-min) (point-max)))))
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161
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162 (defun printify-region (begin end)
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163 "Turn nonprinting characters (other than TAB, LF, SPC, RET, and FF)
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164 in the current buffer into printable representations as control or
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165 hexadecimal escapes."
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166 (interactive "r")
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167 (save-excursion
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168 (goto-char begin)
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169 (let (c)
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170 (while (re-search-forward "[\^@-\^h\^k\^n-\^_\177-\377]" end t)
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171 (setq c (preceding-char))
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172 (delete-backward-char 1)
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173 (insert
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174 (if (< c ?\ )
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175 (format "\\^%c" (+ c ?@))
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176 (format "\\%02x" c)))))))
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177
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178 (provide 'lpr)
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179
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180 ;;; lpr.el ends here
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