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1 ;;; enriched.el --- read and save files in text/enriched format
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2 ;; Copyright (c) 1994, 1995 Free Software Foundation, Inc.
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3
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4 ;; XEmacs version: Mike Sperber <sperber@informatik.uni-tuebingen.de>
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5 ;; Original author: Boris Goldowsky <boris@gnu.ai.mit.edu>
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6 ;; Keywords: wp, faces
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7
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8 ;; This file is part of GNU Emacs.
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9
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10 ;; GNU Emacs is free software; you can redistribute it and/or modify
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11 ;; it 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 ;; GNU Emacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU 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 GNU Emacs; see the file COPYING. If not, write to
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22 ;; the Free 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 ;; This file implements reading, editing, and saving files with
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29 ;; text-properties such as faces, levels of indentation, and true line breaks
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30 ;; distinguished from newlines just used to fit text into the window.
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31 ;;
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32 ;; The file format used is the MIME text/enriched format, which is a
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33 ;; standard format defined in internet RFC 1563. All standard
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34 ;; annotations are supported.
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35 ;;
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36 ;; A separate file, enriched.doc, contains further documentation and other
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37 ;; important information about this code. It also serves as an example file
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38 ;; in text/enriched format. It should be in the etc directory of your emacs
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39 ;; distribution.
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40 ;;
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41 ;;; TODO for the XEmacs port:
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42 ;;
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43 ;; Currently XEmacs does not support default-text-properties. The
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44 ;; original enriched.el uses this to set the left-margin,
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45 ;; right-margin, and justification properties to 'front-sticky.
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46 ;; If you know the Right Way to fix this, contact
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47 ;; Mike Sperber <sperber@informatik.uni-tuebingen.de>.
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48
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49 (provide 'enriched)
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50 (require 'facemenu)
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51
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52 ;;;
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53 ;;; Variables controlling the display
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54 ;;;
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55
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56 (defvar enriched-verbose t
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57 "*If non-nil, give status messages when reading and writing files.")
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58
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59 (defvar enriched-default-right-margin 10
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60 "*Default amount of space to leave on the right edge of the screen.
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61 This can be increased inside text by changing the 'right-margin text property.
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62 Measured in character widths. If the screen is narrower than this, it is
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63 assumed to be 0.")
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64
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65 (defvar enriched-fill-after-visiting t
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66 "If t, fills paragraphs when reading in enriched documents.
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67 If nil, only fills when you explicitly request it. If the value is 'ask, then
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68 it will query you whether to fill.
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69 Filling is never done if the current text-width is the same as the value
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70 stored in the file.")
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71
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72 ;;;
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73 ;;; Set up faces & display table
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74 ;;;
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75
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76 (if (not (find-face 'fixed))
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77 (copy-face 'default 'fixed))
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78
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79 (if (not (find-face 'excerpt))
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80 (copy-face 'italic 'excerpt))
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81
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82 (defconst enriched-display-table (make-display-table))
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83 (aset enriched-display-table ?\f (make-string (1- (frame-width)) ?-))
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84
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85 ;;;
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86 ;;; Variables controlling the file format
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87 ;;; (bidirectional)
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88
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89 (defconst enriched-initial-annotation
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90 (lambda ()
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91 (format "Content-Type: text/enriched\nText-Width: %d\n\n"
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92 (enriched-text-width)))
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93 "What to insert at the start of a text/enriched file.
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94 If this is a string, it is inserted. If it is a list, it should be a lambda
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95 expression, which is evaluated to get the string to insert.")
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96
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97 (defconst enriched-annotation-format "<%s%s>"
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98 "General format of enriched-text annotations.")
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99
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100 (defconst enriched-annotation-regexp "<\\(/\\)?\\([-A-za-z0-9]+\\)>"
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101 "Regular expression matching enriched-text annotations.")
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102
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103 (defconst enriched-translations
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104 '((face (bold-italic "bold" "italic")
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105 (bold "bold")
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106 (italic "italic")
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107 (underline "underline")
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108 (fixed "fixed")
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109 (excerpt "excerpt")
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110 (default )
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111 (nil enriched-encode-other-face))
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112 (size (nil enriched-encode-size))
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113 (justification (none "nofill")
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114 (right "flushright")
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115 (left "flushleft")
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116 (full "flushboth")
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117 (center "center"))
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118 (left-margin (4 "indent"))
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119 (right-margin (4 "indentright"))
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120 (PARAMETER (t "param")) ; Argument of preceding annotation
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121 (FUNCTION (enriched-decode-foreground "x-color")
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122 (enriched-decode-background "x-bg-color")
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123 (facemenu-make-larger "bigger")
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124 (facemenu-make-smaller "smaller"))
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125 (read-only (t "x-read-only"))
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126 (unknown (nil format-annotate-value)))
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127 "List of definitions of text/enriched annotations.
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128 See `format-annotate-region' and `format-deannotate-region' for the definition
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129 of this structure.")
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130
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131 (defconst enriched-ignore '(hard)
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132 "Properties that are OK to ignore when saving text/enriched files.
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133 Any property that is neither on this list nor dealt with by
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134 `enriched-translations' will generate a warning.")
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135
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136 ;;; Internal variables
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137
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138 (defvar enriched-mode nil
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139 "True if `enriched-mode' is in use.")
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140 (make-variable-buffer-local 'enriched-mode)
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141
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142 (if (not (assq 'enriched-mode minor-mode-alist))
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143 (setq minor-mode-alist
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144 (cons '(enriched-mode " Enriched")
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145 minor-mode-alist)))
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146
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147 (defvar enriched-mode-hooks nil
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148 "Functions to run when entering `enriched-mode'.
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149 If you set variables in this hook, you should arrange for them to be restored
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150 to their old values if enriched-mode is left. One way to do this is to add
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151 them and their old values to `enriched-old-bindings'.")
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152
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153 (defvar enriched-old-bindings nil
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154 "Store old variable values that we change when entering mode.
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155 The value is a list of \(VAR VALUE VAR VALUE...).")
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156 (make-variable-buffer-local 'enriched-old-bindings)
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157
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158 (defvar enriched-text-width nil)
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159 (make-variable-buffer-local 'enriched-text-width)
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160
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161 ;;;
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162 ;;; Define the mode
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163 ;;;
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164
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165 ;;;###autoload
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166 (defun enriched-mode (&optional arg)
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167 "Minor mode for editing text/enriched files.
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168 These are files with embedded formatting information in the MIME standard
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169 text/enriched format.
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170 Turning the mode on runs `enriched-mode-hooks'.
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171
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172 More information about enriched-mode is available in the file
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173 etc/enriched.doc in the Emacs distribution directory.
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174
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175 Commands:
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176
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177 \\<enriched-mode-map>\\{enriched-mode-map}"
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178 (interactive "P")
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179 (let ((mod (buffer-modified-p)))
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180 (cond ((or (<= (prefix-numeric-value arg) 0)
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181 (and enriched-mode (null arg)))
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182 ;; Turn mode off
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183 (setq enriched-mode nil)
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184 (setq buffer-file-format (delq 'text/enriched buffer-file-format))
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185 ;; restore old variable values
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186 (while enriched-old-bindings
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187 (funcall 'set (car enriched-old-bindings)
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188 (car (cdr enriched-old-bindings)))
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189 (setq enriched-old-bindings (cdr (cdr enriched-old-bindings)))))
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190
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191 (enriched-mode nil) ; Mode already on; do nothing.
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192
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193 (t (setq enriched-mode t) ; Turn mode on
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194 (if (not (memq 'text/enriched buffer-file-format))
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195 (setq buffer-file-format
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196 (cons 'text/enriched buffer-file-format)))
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197 ;; Save old variable values before we change them.
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198 ;; These will be restored if we exit enriched-mode.
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199 (setq enriched-old-bindings
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200 (list 'indent-line-function indent-line-function
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201 'use-hard-newlines use-hard-newlines))
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202 (make-local-variable 'indent-line-function)
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203 (make-local-variable 'use-hard-newlines)
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204 (setq indent-line-function 'indent-to-left-margin
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205 use-hard-newlines t)
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206
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207 ;; copy display table
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208 (frob-display-table
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209 #'(lambda (dt)
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210 (let ((l (length enriched-display-table))
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211 (c 0))
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212 (while (< c l)
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213 (let ((v (aref enriched-display-table c)))
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214 (if v
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215 (aset dt c v)))
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216 (setq c (1+ c)))))
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217 (current-buffer))
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218 (run-hooks 'enriched-mode-hooks)))
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219 (set-buffer-modified-p mod)
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220 (redraw-modeline)))
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221
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222 ;;;
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223 ;;; Keybindings
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224 ;;;
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225
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226 (defvar enriched-mode-map nil
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227 "Keymap for `enriched-mode'.")
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228
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229 (if (null enriched-mode-map)
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230 (fset 'enriched-mode-map (setq enriched-mode-map (make-sparse-keymap))))
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231
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232 (if (not (assq 'enriched-mode minor-mode-map-alist))
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233 (setq minor-mode-map-alist
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234 (cons (cons 'enriched-mode enriched-mode-map)
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235 minor-mode-map-alist)))
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236
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237 (define-key enriched-mode-map "\C-a" 'beginning-of-line-text)
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238 (define-key enriched-mode-map "\C-m" 'reindent-then-newline-and-indent)
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239 (define-key enriched-mode-map "\C-j" 'reindent-then-newline-and-indent)
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240 (define-key enriched-mode-map "\M-j" 'facemenu-justification-menu)
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241 (define-key enriched-mode-map "\M-S" 'set-justification-center)
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242 (define-key enriched-mode-map "\C-x\t" 'increase-left-margin)
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243 (define-key enriched-mode-map "\C-c\C-l" 'set-left-margin)
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244 (define-key enriched-mode-map "\C-c\C-r" 'set-right-margin)
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245
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246 ;;;
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247 ;;; Some functions dealing with text-properties, especially indentation
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248 ;;;
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249
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250 (defun enriched-map-property-regions (prop func &optional from to)
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251 "Apply a function to regions of the buffer based on a text property.
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252 For each contiguous region of the buffer for which the value of PROPERTY is
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253 eq, the FUNCTION will be called. Optional arguments FROM and TO specify the
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254 region over which to scan.
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255
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256 The specified function receives three arguments: the VALUE of the property in
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257 the region, and the START and END of each region."
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258 (save-excursion
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259 (save-restriction
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260 (if to (narrow-to-region (point-min) to))
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261 (goto-char (or from (point-min)))
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262 (let ((begin (point))
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263 end
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264 (marker (make-marker))
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265 (val (get-text-property (point) prop)))
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266 (while (setq end (text-property-not-all begin (point-max) prop val))
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267 (move-marker marker end)
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268 (funcall func val begin (marker-position marker))
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269 (setq begin (marker-position marker)
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270 val (get-text-property marker prop)))
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271 (if (< begin (point-max))
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272 (funcall func val begin (point-max)))))))
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273
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274 (put 'enriched-map-property-regions 'lisp-indent-hook 1)
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275
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276 (defun enriched-insert-indentation (&optional from to)
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277 "Indent and justify each line in the region."
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278 (save-excursion
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279 (save-restriction
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280 (if to (narrow-to-region (point-min) to))
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281 (goto-char (or from (point-min)))
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282 (if (not (bolp)) (forward-line 1))
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283 (while (not (eobp))
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284 (if (eolp)
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285 nil ; skip blank lines
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286 (indent-to (current-left-margin))
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287 (justify-current-line t nil t))
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288 (forward-line 1)))))
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289
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290 (defun enriched-text-width ()
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291 "The width of unindented text in this window, in characters.
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292 This is the width of the window minus `enriched-default-right-margin'."
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293 (or enriched-text-width
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294 (let ((ww (window-width)))
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295 (setq enriched-text-width
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296 (if (> ww enriched-default-right-margin)
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297 (- ww enriched-default-right-margin)
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298 ww)))))
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299
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300 ;;;
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301 ;;; Encoding Files
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302 ;;;
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303
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304 ;;;###autoload
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305 (defun enriched-encode (from to)
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306 (if enriched-verbose (message "Enriched: encoding document..."))
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307 (save-restriction
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308 (narrow-to-region from to)
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309 (delete-to-left-margin)
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310 (unjustify-region)
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311 (goto-char from)
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312 (format-replace-strings '(("<" . "<<")))
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313 (format-insert-annotations
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314 (format-annotate-region from (point-max) enriched-translations
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315 'enriched-make-annotation enriched-ignore))
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316 (goto-char from)
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317 (insert (if (stringp enriched-initial-annotation)
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318 enriched-initial-annotation
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319 (funcall enriched-initial-annotation)))
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320 (enriched-map-property-regions 'hard
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321 (lambda (v b e)
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322 (if (and v (= ?\n (char-after b)))
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323 (progn (goto-char b) (insert "\n"))))
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324 (point) nil)
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325 (if enriched-verbose (message nil))
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326 ;; Return new end.
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327 (point-max)))
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328
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329 (defun enriched-make-annotation (name positive)
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330 "Format an annotation called NAME.
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331 If POSITIVE is non-nil, this is the opening annotation, if nil, this is the
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332 matching close."
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333 (cond ((stringp name)
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334 (format enriched-annotation-format (if positive "" "/") name))
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335 ;; Otherwise it is an annotation with parameters, represented as a list
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336 (positive
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337 (let ((item (car name))
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338 (params (cdr name)))
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339 (concat (format enriched-annotation-format "" item)
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340 (mapconcat (lambda (i) (concat "<param>" i "</param>"))
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341 params ""))))
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342 (t (format enriched-annotation-format "/" (car name)))))
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343
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344 (defun enriched-face-strip-size (face)
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345 "Create a symbol from the name of FACE devoid of size information,
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346 i.e. remove all larger- and smaller- prefixes."
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347 (let* ((face-symbol (face-name face))
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348 (face-name (symbol-name face-symbol))
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349 (old-name face-name)
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350 new-name)
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351 (while
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352 (not (string-equal
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353 old-name
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354 (setq new-name (replace-in-string old-name "^larger-" ""))))
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355 (setq old-name new-name))
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356
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357 (while
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358 (not (string-equal
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359 old-name
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360 (setq new-name (replace-in-string old-name "^smaller-" ""))))
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361 (setq old-name new-name))
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362
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363 (if (string-equal new-name face-name)
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364 face-symbol
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365 (intern new-name))))
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366
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367 (defun enriched-encode-other-face (old new)
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368 "Generate annotations for random face change.
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369 One annotation each for foreground color, background color, italic, etc."
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370 (cons (and old (enriched-face-ans old))
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371 (and new (enriched-face-ans new))))
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372
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373 (defun enriched-face-ans (face)
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374 "Return annotations specifying FACE."
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375 (let ((face-name (symbol-name face)))
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376 (cond ((string-match "^fg:" face-name)
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377 (list (list "x-color" (substring face-name 3))))
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378 ((string-match "^bg:" face-name)
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379 (list (list "x-bg-color" (substring face-name 3))))
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380 ((or (string-match "^larger-" face-name)
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381 (string-match "^smaller-" face-name))
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382 (cdr (format-annotate-single-property-change
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383 'face nil (enriched-face-strip-size face)
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384 enriched-translations)))
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385 (t
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386 (let* ((fg (and (not (eq (face-foreground face)
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387 (face-foreground 'default)))
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388 (color-instance-name (face-foreground face))))
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389 (bg (and (not (eq (face-background face)
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390 (face-background 'default)))
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391 (color-instance-name (face-background face))))
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392 (ans '()))
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393 (if fg (setq ans (cons (list "x-color" fg) ans)))
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394 (if bg (setq ans (cons (list "x-bg-color" bg) ans)))
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395 ans)))))
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396
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397
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398 (defun enriched-size-annotation (n annotation)
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399 "Generate ANNOTATION N times."
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400 (let ((l '()))
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401 (while (not (zerop n))
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402 (setq l (cons annotation l))
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403 (setq n (1- n)))
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404 l))
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405
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406 (defun enriched-encode-size (old new)
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407 "Return annotations specifying SIZE."
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408 (let* ((old (or old 0))
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409 (new (or new 0))
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410 (closing-annotation
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411 (enriched-size-annotation (abs old)
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412 (if (> old 0) "bigger" "smaller")))
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413 (opening-annotation
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414 (enriched-size-annotation (abs new)
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415 (if (> new 0) "bigger" "smaller"))))
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416 (cons closing-annotation
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417 opening-annotation)))
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418
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419 ;;;
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420 ;;; Decoding files
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421 ;;;
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422
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423 ;;;###autoload
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424 (defun enriched-decode (from to)
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425 (if enriched-verbose (message "Enriched: decoding document..."))
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426 (save-excursion
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427 (save-restriction
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428 (narrow-to-region from to)
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429 (goto-char from)
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430 (let ((file-width (enriched-get-file-width))
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431 (use-hard-newlines t))
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432 (enriched-remove-header)
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433
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434 ;; Deal with newlines
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435 (goto-char from)
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436 (while (search-forward-regexp "\n\n+" nil t)
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437 (if (current-justification)
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438 (delete-char -1))
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439 (put-text-property (match-beginning 0) (point) 'hard t)
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440 (put-text-property (match-beginning 0) (point) 'front-sticky nil))
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441
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442 ;; Translate annotations
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443 (format-deannotate-region from (point-max) enriched-translations
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444 'enriched-next-annotation)
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445
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446 ;; Fill paragraphs
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447 (if (or (and file-width ; possible reasons not to fill:
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448 (= file-width (enriched-text-width))) ; correct wd.
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449 (null enriched-fill-after-visiting) ; never fill
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450 (and (eq 'ask enriched-fill-after-visiting) ; asked & declined
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451 (not (y-or-n-p "Re-fill for current display width? "))))
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452 ;; Minimally, we have to insert indentation and justification.
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453 (enriched-insert-indentation)
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454 (if enriched-verbose (message "Filling paragraphs..."))
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455 (fill-region (point-min) (point-max))))
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456 (if enriched-verbose (message nil))
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457 (point-max))))
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458
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459 (defun enriched-next-annotation ()
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460 "Find and return next text/enriched annotation.
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461 Any \"<<\" strings encountered are converted to \"<\".
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462 Return value is \(begin end name positive-p), or nil if none was found."
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463 (while (and (search-forward "<" nil 1)
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464 (progn (goto-char (match-beginning 0))
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465 (not (looking-at enriched-annotation-regexp))))
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466 (forward-char 1)
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467 (if (= ?< (char-after (point)))
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468 (delete-char 1)
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469 ;; A single < that does not start an annotation is an error,
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470 ;; which we note and then ignore.
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471 (message (format "Warning: malformed annotation in file at %s"
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472 (1- (point))))))
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473 (if (not (eobp))
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474 (let* ((beg (match-beginning 0))
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475 (end (match-end 0))
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476 (name (downcase (buffer-substring
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477 (match-beginning 2) (match-end 2))))
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478 (pos (not (match-beginning 1))))
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479 (list beg end name pos))))
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480
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481 (defun enriched-get-file-width ()
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482 "Look for file width information on this line."
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|
483 (save-excursion
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484 (if (search-forward "Text-Width: " (+ (point) 1000) t)
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485 (read (current-buffer)))))
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486
|
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487 (defun enriched-remove-header ()
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488 "Remove file-format header at point."
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489 (while (looking-at "^[-A-Za-z]+: .*\n")
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490 (delete-region (point) (match-end 0)))
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491 (if (looking-at "^\n")
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492 (delete-char 1)))
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493
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494 (defun enriched-decode-foreground (from to color)
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495 (let ((face (facemenu-get-face (intern (concat "fg:" color)))))
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496 (if (not face)
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|
|
497 (progn
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|
498 (make-face face)
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|
499 (message "Warning: Color \"%s\" can't be displayed." color)))
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|
|
500 (list from to 'face face)))
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501
|
|
|
502 (defun enriched-decode-background (from to color)
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|
503 (let ((face (facemenu-get-face (intern (concat "bg:" color)))))
|
|
|
504 (if (not face)
|
|
|
505 (progn
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|
|
506 (make-face face)
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|
507 (message "Warning: Color \"%s\" can't be displayed." color)))
|
|
|
508 (list from to 'face face)))
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509
|
|
|
510 ;;; enriched.el ends here
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