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1 ;;; gnus-spec.el --- format spec functions for Gnus
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2 ;; Copyright (C) 1996,97 Free Software Foundation, Inc.
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3
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4 ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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5 ;; Keywords: news
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6
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7 ;; This file is part of GNU Emacs.
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8
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9 ;; GNU Emacs is free software; you can redistribute it and/or modify
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10 ;; it under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; GNU Emacs is distributed in the hope that it will be useful,
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15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 ;; GNU General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 ;; Boston, MA 02111-1307, USA.
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23
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24 ;;; Commentary:
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25
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26 ;;; Code:
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27
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28 (require 'gnus)
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29
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30 ;;; Internal variables.
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31
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32 (defvar gnus-summary-mark-positions nil)
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33 (defvar gnus-group-mark-positions nil)
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34 (defvar gnus-group-indentation "")
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35
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36 ;; Format specs. The chunks below are the machine-generated forms
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37 ;; that are to be evaled as the result of the default format strings.
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38 ;; We write them in here to get them byte-compiled. That way the
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39 ;; default actions will be quite fast, while still retaining the full
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40 ;; flexibility of the user-defined format specs.
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41
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42 ;; First we have lots of dummy defvars to let the compiler know these
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43 ;; are really dynamic variables.
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44
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45 (defvar gnus-tmp-unread)
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46 (defvar gnus-tmp-replied)
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47 (defvar gnus-tmp-score-char)
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48 (defvar gnus-tmp-indentation)
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49 (defvar gnus-tmp-opening-bracket)
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50 (defvar gnus-tmp-lines)
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51 (defvar gnus-tmp-name)
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52 (defvar gnus-tmp-closing-bracket)
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53 (defvar gnus-tmp-subject-or-nil)
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54 (defvar gnus-tmp-subject)
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55 (defvar gnus-tmp-marked)
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56 (defvar gnus-tmp-marked-mark)
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57 (defvar gnus-tmp-subscribed)
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58 (defvar gnus-tmp-process-marked)
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59 (defvar gnus-tmp-number-of-unread)
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60 (defvar gnus-tmp-group-name)
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61 (defvar gnus-tmp-group)
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62 (defvar gnus-tmp-article-number)
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63 (defvar gnus-tmp-unread-and-unselected)
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64 (defvar gnus-tmp-news-method)
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65 (defvar gnus-tmp-news-server)
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66 (defvar gnus-tmp-article-number)
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67 (defvar gnus-mouse-face)
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68 (defvar gnus-mouse-face-prop)
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69
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70 (defun gnus-summary-line-format-spec ()
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71 (insert gnus-tmp-unread gnus-tmp-replied
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72 gnus-tmp-score-char gnus-tmp-indentation)
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73 (gnus-put-text-property
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74 (point)
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75 (progn
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76 (insert
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77 gnus-tmp-opening-bracket
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78 (format "%4d: %-20s"
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79 gnus-tmp-lines
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80 (if (> (length gnus-tmp-name) 20)
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81 (substring gnus-tmp-name 0 20)
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82 gnus-tmp-name))
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83 gnus-tmp-closing-bracket)
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84 (point))
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85 gnus-mouse-face-prop gnus-mouse-face)
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86 (insert " " gnus-tmp-subject-or-nil "\n"))
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87
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88 (defvar gnus-summary-line-format-spec
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89 (gnus-byte-code 'gnus-summary-line-format-spec))
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90
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91 (defun gnus-summary-dummy-line-format-spec ()
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92 (insert "* ")
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93 (gnus-put-text-property
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94 (point)
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95 (progn
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96 (insert ": :")
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97 (point))
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98 gnus-mouse-face-prop gnus-mouse-face)
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99 (insert " " gnus-tmp-subject "\n"))
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100
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101 (defvar gnus-summary-dummy-line-format-spec
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102 (gnus-byte-code 'gnus-summary-dummy-line-format-spec))
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103
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104 (defun gnus-group-line-format-spec ()
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105 (insert gnus-tmp-marked-mark gnus-tmp-subscribed
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106 gnus-tmp-process-marked
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107 gnus-group-indentation
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108 (format "%5s: " gnus-tmp-number-of-unread))
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109 (gnus-put-text-property
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110 (point)
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111 (progn
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112 (insert gnus-tmp-group "\n")
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113 (1- (point)))
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114 gnus-mouse-face-prop gnus-mouse-face))
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115 (defvar gnus-group-line-format-spec
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116 (gnus-byte-code 'gnus-group-line-format-spec))
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117
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30
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118 (defvar gnus-format-specs
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119 `((version . ,emacs-version)
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120 (group "%M\%S\%p\%P\%5y: %(%g%)%l\n" ,gnus-group-line-format-spec)
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121 (summary-dummy "* %(: :%) %S\n"
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122 ,gnus-summary-dummy-line-format-spec)
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30
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123 (summary "%U\%R\%z\%I\%(%[%4L: %-20,20n%]%) %s\n"
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124 ,gnus-summary-line-format-spec))
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125 "Alist of format specs.")
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126
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127 (defvar gnus-article-mode-line-format-spec nil)
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128 (defvar gnus-summary-mode-line-format-spec nil)
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129 (defvar gnus-group-mode-line-format-spec nil)
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130
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131 ;;; Phew. All that gruft is over, fortunately.
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132
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133 ;;;###autoload
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134 (defun gnus-update-format (var)
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135 "Update the format specification near point."
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136 (interactive
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137 (list
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138 (save-excursion
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139 (eval-defun nil)
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140 ;; Find the end of the current word.
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141 (re-search-forward "[ \t\n]" nil t)
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142 ;; Search backward.
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143 (when (re-search-backward "\\(gnus-[-a-z]+-line-format\\)" nil t)
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144 (match-string 1)))))
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145 (let* ((type (intern (progn (string-match "gnus-\\([-a-z]+\\)-line" var)
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146 (match-string 1 var))))
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147 (entry (assq type gnus-format-specs))
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148 value spec)
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149 (when entry
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150 (setq gnus-format-specs (delq entry gnus-format-specs)))
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151 (set
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152 (intern (format "%s-spec" var))
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153 (gnus-parse-format (setq value (symbol-value (intern var)))
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154 (symbol-value (intern (format "%s-alist" var)))
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155 (not (string-match "mode" var))))
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156 (setq spec (symbol-value (intern (format "%s-spec" var))))
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157 (push (list type value spec) gnus-format-specs)
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158
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159 (pop-to-buffer "*Gnus Format*")
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160 (erase-buffer)
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161 (lisp-interaction-mode)
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162 (insert (pp-to-string spec))))
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163
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164 (defun gnus-update-format-specifications (&optional force &rest types)
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165 "Update all (necessary) format specifications."
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166 ;; Make the indentation array.
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167 ;; See whether all the stored info needs to be flushed.
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168 (when (or force
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169 (not (equal emacs-version
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170 (cdr (assq 'version gnus-format-specs)))))
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171 (setq gnus-format-specs nil))
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172
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173 ;; Go through all the formats and see whether they need updating.
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174 (let (new-format entry type val)
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175 (while (setq type (pop types))
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176 ;; Jump to the proper buffer to find out the value of
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177 ;; the variable, if possible. (It may be buffer-local.)
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178 (save-excursion
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179 (let ((buffer (intern (format "gnus-%s-buffer" type)))
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180 val)
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181 (when (and (boundp buffer)
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182 (setq val (symbol-value buffer))
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183 (get-buffer val)
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184 (buffer-name (get-buffer val)))
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185 (set-buffer (get-buffer val)))
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186 (setq new-format (symbol-value
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187 (intern (format "gnus-%s-line-format" type)))))
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188 (setq entry (cdr (assq type gnus-format-specs)))
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189 (if (and (car entry)
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190 (equal (car entry) new-format))
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191 ;; Use the old format.
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192 (set (intern (format "gnus-%s-line-format-spec" type))
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193 (cadr entry))
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194 ;; This is a new format.
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195 (setq val
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196 (if (not (stringp new-format))
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197 ;; This is a function call or something.
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198 new-format
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199 ;; This is a "real" format.
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200 (gnus-parse-format
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201 new-format
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202 (symbol-value
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203 (intern (format "gnus-%s-line-format-alist"
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204 (if (eq type 'article-mode)
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205 'summary-mode type))))
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206 (not (string-match "mode$" (symbol-name type))))))
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207 ;; Enter the new format spec into the list.
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208 (if entry
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209 (progn
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210 (setcar (cdr entry) val)
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211 (setcar entry new-format))
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212 (push (list type new-format val) gnus-format-specs))
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213 (set (intern (format "gnus-%s-line-format-spec" type)) val)))))
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214
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215 (unless (assq 'version gnus-format-specs)
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216 (push (cons 'version emacs-version) gnus-format-specs)))
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217
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218 (defvar gnus-mouse-face-0 'highlight)
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219 (defvar gnus-mouse-face-1 'highlight)
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220 (defvar gnus-mouse-face-2 'highlight)
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221 (defvar gnus-mouse-face-3 'highlight)
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222 (defvar gnus-mouse-face-4 'highlight)
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223
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224 (defun gnus-mouse-face-function (form type)
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225 `(gnus-put-text-property
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226 (point) (progn ,@form (point))
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227 gnus-mouse-face-prop
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228 ,(if (equal type 0)
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229 'gnus-mouse-face
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230 `(quote ,(symbol-value (intern (format "gnus-mouse-face-%d" type)))))))
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231
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232 (defvar gnus-face-0 'bold)
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233 (defvar gnus-face-1 'italic)
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234 (defvar gnus-face-2 'bold-italic)
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235 (defvar gnus-face-3 'bold)
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236 (defvar gnus-face-4 'bold)
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237
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238 (defun gnus-face-face-function (form type)
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239 `(gnus-put-text-property
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240 (point) (progn ,@form (point))
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241 'face ',(symbol-value (intern (format "gnus-face-%d" type)))))
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242
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243 (defun gnus-tilde-max-form (el max-width)
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244 "Return a form that limits EL to MAX-WIDTH."
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245 (let ((max (abs max-width)))
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246 (if (symbolp el)
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247 `(if (> (length ,el) ,max)
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248 ,(if (< max-width 0)
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249 `(substring ,el (- (length el) ,max))
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250 `(substring ,el 0 ,max))
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251 ,el)
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252 `(let ((val (eval ,el)))
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253 (if (> (length val) ,max)
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254 ,(if (< max-width 0)
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255 `(substring val (- (length val) ,max))
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256 `(substring val 0 ,max))
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257 val)))))
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258
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259 (defun gnus-tilde-cut-form (el cut-width)
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260 "Return a form that cuts CUT-WIDTH off of EL."
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261 (let ((cut (abs cut-width)))
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262 (if (symbolp el)
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263 `(if (> (length ,el) ,cut)
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264 ,(if (< cut-width 0)
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265 `(substring ,el 0 (- (length el) ,cut))
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266 `(substring ,el ,cut))
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267 ,el)
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268 `(let ((val (eval ,el)))
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269 (if (> (length val) ,cut)
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270 ,(if (< cut-width 0)
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271 `(substring val 0 (- (length val) ,cut))
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272 `(substring val ,cut))
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273 val)))))
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274
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275 (defun gnus-tilde-ignore-form (el ignore-value)
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276 "Return a form that is blank when EL is IGNORE-VALUE."
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277 (if (symbolp el)
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278 `(if (equal ,el ,ignore-value)
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279 "" ,el)
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280 `(let ((val (eval ,el)))
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281 (if (equal val ,ignore-value)
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282 "" val))))
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283
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284 (defun gnus-parse-format (format spec-alist &optional insert)
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285 ;; This function parses the FORMAT string with the help of the
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286 ;; SPEC-ALIST and returns a list that can be eval'ed to return the
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287 ;; string. If the FORMAT string contains the specifiers %( and %)
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288 ;; the text between them will have the mouse-face text property.
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289 (if (string-match
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290 "\\`\\(.*\\)%[0-9]?[{(]\\(.*\\)%[0-9]?[})]\\(.*\n?\\)\\'"
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291 format)
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292 (gnus-parse-complex-format format spec-alist)
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293 ;; This is a simple format.
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294 (gnus-parse-simple-format format spec-alist insert)))
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295
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296 (defun gnus-parse-complex-format (format spec-alist)
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297 (save-excursion
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298 (gnus-set-work-buffer)
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299 (insert format)
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300 (goto-char (point-min))
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301 (while (re-search-forward "\"" nil t)
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302 (replace-match "\\\"" nil t))
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303 (goto-char (point-min))
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304 (insert "(\"")
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305 (while (re-search-forward "%\\([0-9]+\\)?\\([{}()]\\)" nil t)
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306 (let ((number (if (match-beginning 1)
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307 (match-string 1) "0"))
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308 (delim (aref (match-string 2) 0)))
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309 (if (or (= delim ?\() (= delim ?\{))
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310 (replace-match (concat "\"(" (if (= delim ?\() "mouse" "face")
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311 " " number " \""))
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312 (replace-match "\")\""))))
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313 (goto-char (point-max))
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314 (insert "\")")
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315 (goto-char (point-min))
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316 (let ((form (read (current-buffer))))
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317 (cons 'progn (gnus-complex-form-to-spec form spec-alist)))))
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318
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319 (defun gnus-complex-form-to-spec (form spec-alist)
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320 (delq nil
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321 (mapcar
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322 (lambda (sform)
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323 (if (stringp sform)
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324 (gnus-parse-simple-format sform spec-alist t)
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325 (funcall (intern (format "gnus-%s-face-function" (car sform)))
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326 (gnus-complex-form-to-spec (cddr sform) spec-alist)
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327 (nth 1 sform))))
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328 form)))
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329
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330 (defun gnus-parse-simple-format (format spec-alist &optional insert)
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331 ;; This function parses the FORMAT string with the help of the
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332 ;; SPEC-ALIST and returns a list that can be eval'ed to return a
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333 ;; string.
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334 (let ((max-width 0)
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335 spec flist fstring elem result dontinsert user-defined
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336 type value pad-width spec-beg cut-width ignore-value
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337 tilde-form tilde elem-type)
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338 (save-excursion
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339 (gnus-set-work-buffer)
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340 (insert format)
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341 (goto-char (point-min))
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342 (while (re-search-forward "%" nil t)
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343 (setq user-defined nil
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344 spec-beg nil
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345 pad-width nil
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346 max-width nil
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347 cut-width nil
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348 ignore-value nil
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349 tilde-form nil)
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350 (setq spec-beg (1- (point)))
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351
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352 ;; Parse this spec fully.
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353 (while
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30
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354 (cond
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16
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355 ((looking-at "\\([-.0-9]+\\)\\(,[-0-9]+\\)?")
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356 (setq pad-width (string-to-number (match-string 1)))
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357 (when (match-beginning 2)
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358 (setq max-width (string-to-number (buffer-substring
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359 (1+ (match-beginning 2))
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360 (match-end 2)))))
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361 (goto-char (match-end 0)))
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362 ((looking-at "~")
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363 (forward-char 1)
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364 (setq tilde (read (current-buffer))
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365 type (car tilde)
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366 value (cadr tilde))
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367 (cond
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368 ((memq type '(pad pad-left))
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369 (setq pad-width value))
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370 ((eq type 'pad-right)
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371 (setq pad-width (- value)))
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372 ((memq type '(max-right max))
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373 (setq max-width value))
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374 ((eq type 'max-left)
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375 (setq max-width (- value)))
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376 ((memq type '(cut cut-left))
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377 (setq cut-width value))
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378 ((eq type 'cut-right)
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379 (setq cut-width (- value)))
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380 ((eq type 'ignore)
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381 (setq ignore-value
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382 (if (stringp value) value (format "%s" value))))
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383 ((eq type 'form)
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384 (setq tilde-form value))
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385 (t
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386 (error "Unknown tilde type: %s" tilde)))
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387 t)
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388 (t
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389 nil)))
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390 ;; User-defined spec -- find the spec name.
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391 (when (= (setq spec (following-char)) ?u)
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392 (forward-char 1)
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393 (setq user-defined (following-char)))
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394 (forward-char 1)
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395 (delete-region spec-beg (point))
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396
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397 ;; Now we have all the relevant data on this spec, so
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398 ;; we start doing stuff.
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399 (insert "%")
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400 (if (eq spec ?%)
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401 ;; "%%" just results in a "%".
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402 (insert "%")
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403 (cond
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404 ;; Do tilde forms.
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405 ((eq spec ?@)
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406 (setq elem (list tilde-form ?s)))
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407 ;; Treat user defined format specifiers specially.
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408 (user-defined
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409 (setq elem
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410 (list
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411 (list (intern (format "gnus-user-format-function-%c"
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412 user-defined))
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413 'gnus-tmp-header)
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414 ?s)))
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415 ;; Find the specification from `spec-alist'.
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416 ((setq elem (cdr (assq spec spec-alist))))
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417 (t
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418 (setq elem '("*" ?s))))
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419 (setq elem-type (cadr elem))
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420 ;; Insert the new format elements.
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421 (when pad-width
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422 (insert (number-to-string pad-width)))
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423 ;; Create the form to be evaled.
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424 (if (or max-width cut-width ignore-value)
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425 (progn
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426 (insert ?s)
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427 (let ((el (car elem)))
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428 (cond ((= (cadr elem) ?c)
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429 (setq el (list 'char-to-string el)))
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|
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430 ((= (cadr elem) ?d)
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|
|
431 (setq el (list 'int-to-string el))))
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|
|
432 (when ignore-value
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|
433 (setq el (gnus-tilde-ignore-form el ignore-value)))
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|
|
434 (when cut-width
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|
|
435 (setq el (gnus-tilde-cut-form el cut-width)))
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|
|
436 (when max-width
|
|
|
437 (setq el (gnus-tilde-max-form el max-width)))
|
|
|
438 (push el flist)))
|
|
|
439 (insert elem-type)
|
|
|
440 (push (car elem) flist))))
|
|
|
441 (setq fstring (buffer-string)))
|
|
30
|
442
|
|
16
|
443 ;; Do some postprocessing to increase efficiency.
|
|
|
444 (setq
|
|
|
445 result
|
|
|
446 (cond
|
|
|
447 ;; Emptyness.
|
|
|
448 ((string= fstring "")
|
|
|
449 nil)
|
|
|
450 ;; Not a format string.
|
|
|
451 ((not (string-match "%" fstring))
|
|
|
452 (list fstring))
|
|
|
453 ;; A format string with just a single string spec.
|
|
|
454 ((string= fstring "%s")
|
|
|
455 (list (car flist)))
|
|
|
456 ;; A single character.
|
|
|
457 ((string= fstring "%c")
|
|
|
458 (list (car flist)))
|
|
|
459 ;; A single number.
|
|
|
460 ((string= fstring "%d")
|
|
|
461 (setq dontinsert)
|
|
|
462 (if insert
|
|
|
463 (list `(princ ,(car flist)))
|
|
|
464 (list `(int-to-string ,(car flist)))))
|
|
|
465 ;; Just lots of chars and strings.
|
|
|
466 ((string-match "\\`\\(%[cs]\\)+\\'" fstring)
|
|
|
467 (nreverse flist))
|
|
|
468 ;; A single string spec at the beginning of the spec.
|
|
|
469 ((string-match "\\`%[sc][^%]+\\'" fstring)
|
|
|
470 (list (car flist) (substring fstring 2)))
|
|
|
471 ;; A single string spec in the middle of the spec.
|
|
|
472 ((string-match "\\`\\([^%]+\\)%[sc]\\([^%]+\\)\\'" fstring)
|
|
|
473 (list (match-string 1 fstring) (car flist) (match-string 2 fstring)))
|
|
|
474 ;; A single string spec in the end of the spec.
|
|
|
475 ((string-match "\\`\\([^%]+\\)%[sc]\\'" fstring)
|
|
|
476 (list (match-string 1 fstring) (car flist)))
|
|
|
477 ;; A more complex spec.
|
|
|
478 (t
|
|
|
479 (list (cons 'format (cons fstring (nreverse flist)))))))
|
|
|
480
|
|
|
481 (if insert
|
|
|
482 (when result
|
|
|
483 (if dontinsert
|
|
|
484 result
|
|
|
485 (cons 'insert result)))
|
|
|
486 (cond ((stringp result)
|
|
|
487 result)
|
|
|
488 ((consp result)
|
|
|
489 (cons 'concat result))
|
|
|
490 (t "")))))
|
|
|
491
|
|
|
492 (defun gnus-eval-format (format &optional alist props)
|
|
|
493 "Eval the format variable FORMAT, using ALIST.
|
|
|
494 If PROPS, insert the result."
|
|
|
495 (let ((form (gnus-parse-format format alist props)))
|
|
|
496 (if props
|
|
|
497 (gnus-add-text-properties (point) (progn (eval form) (point)) props)
|
|
|
498 (eval form))))
|
|
|
499
|
|
|
500 (defun gnus-compile ()
|
|
|
501 "Byte-compile the user-defined format specs."
|
|
|
502 (interactive)
|
|
30
|
503 (when gnus-xemacs
|
|
|
504 (error "Can't compile specs under XEmacs"))
|
|
16
|
505 (let ((entries gnus-format-specs)
|
|
|
506 (byte-compile-warnings '(unresolved callargs redefine))
|
|
|
507 entry gnus-tmp-func)
|
|
|
508 (save-excursion
|
|
|
509 (gnus-message 7 "Compiling format specs...")
|
|
|
510
|
|
|
511 (while entries
|
|
|
512 (setq entry (pop entries))
|
|
|
513 (if (eq (car entry) 'version)
|
|
|
514 (setq gnus-format-specs (delq entry gnus-format-specs))
|
|
|
515 (when (and (listp (caddr entry))
|
|
|
516 (not (eq 'byte-code (caaddr entry))))
|
|
|
517 (fset 'gnus-tmp-func `(lambda () ,(caddr entry)))
|
|
|
518 (byte-compile 'gnus-tmp-func)
|
|
|
519 (setcar (cddr entry) (gnus-byte-code 'gnus-tmp-func)))))
|
|
|
520
|
|
|
521 (push (cons 'version emacs-version) gnus-format-specs)
|
|
|
522 ;; Mark the .newsrc.eld file as "dirty".
|
|
|
523 (gnus-dribble-enter " ")
|
|
|
524 (gnus-message 7 "Compiling user specs...done"))))
|
|
|
525
|
|
|
526 (provide 'gnus-spec)
|
|
|
527
|
|
|
528 ;;; gnus-spec.el ends here
|
