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1 ;;; Thread support for VM
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2 ;;; Copyright (C) 1994 Kyle E. Jones
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3 ;;;
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4 ;;; This program is free software; you can redistribute it and/or modify
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5 ;;; it under the terms of the GNU General Public License as published by
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6 ;;; the Free Software Foundation; either version 1, or (at your option)
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7 ;;; any later version.
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8 ;;;
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9 ;;; This program is distributed in the hope that it will be useful,
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10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 ;;; GNU General Public License for more details.
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13 ;;;
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14 ;;; You should have received a copy of the GNU General Public License
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15 ;;; along with this program; if not, write to the Free Software
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16 ;;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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17
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18 (provide 'vm-thread)
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19
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20 (defun vm-toggle-threads-display ()
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21 "Toggle the threads display on and off.
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22 When the threads display is on, the folder will be sorted by
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23 thread and thread indentation (via the %I summary format specifier)
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24 will be visible."
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25 (interactive)
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26 (vm-select-folder-buffer)
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27 (vm-check-for-killed-summary)
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28 (vm-set-summary-redo-start-point t)
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29 (setq vm-summary-show-threads (not vm-summary-show-threads))
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30 (if vm-summary-show-threads
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31 (vm-sort-messages "thread")
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32 (vm-sort-messages "physical-order")))
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33
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34 (defun vm-build-threads (message-list)
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35 (if (null vm-thread-obarray)
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36 (setq vm-thread-obarray (make-vector 641 0)
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37 vm-thread-subject-obarray (make-vector 641 0)))
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38 (let ((mp (or message-list vm-message-list))
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39 (n 0)
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40 ;; Just for laughs, make the update interval vary.
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41 (modulus (+ (% (vm-abs (random)) 11) 40))
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42 ;; no need to schedule reindents of reparented messages
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43 ;; unless there were already messages present.
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44 (schedule-reindents message-list)
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45 parent parent-sym id id-sym date)
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46 (while mp
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47 (setq parent (vm-th-parent (car mp))
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48 id (vm-su-message-id (car mp))
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49 id-sym (intern id vm-thread-obarray)
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50 date (vm-so-sortable-datestring (car mp)))
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51 (put id-sym 'messages (cons (car mp) (get id-sym 'messages)))
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52 (if (and (null (cdr (get id-sym 'messages)))
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53 schedule-reindents)
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54 (vm-thread-mark-for-summary-update (get id-sym 'children)))
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55 (if parent
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56 (progn
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57 (setq parent-sym (intern parent vm-thread-obarray))
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58 (if (not (boundp id-sym))
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59 (set id-sym parent-sym))
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60 (put parent-sym 'children
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61 (cons (car mp) (get parent-sym 'children))))
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62 (set id-sym nil))
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63 ;; we need to make sure the asets below are an atomic group.
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64 (if vm-thread-using-subject
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65 (let* ((inhibit-quit t)
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66 (subject (vm-so-sortable-subject (car mp)))
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67 (subject-sym (intern subject vm-thread-subject-obarray)))
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68 (if (not (boundp subject-sym))
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69 (set subject-sym
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70 (vector id-sym (vm-so-sortable-datestring (car mp))
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71 nil (list (car mp))))
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72 (aset (symbol-value subject-sym) 3
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73 (cons (car mp) (aref (symbol-value subject-sym) 3)))
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74 (if (string< date (aref (symbol-value subject-sym) 1))
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75 (let* ((vect (symbol-value subject-sym))
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76 (i-sym (aref vect 0)))
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77 (if (or (not (boundp i-sym))
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78 (null (symbol-value i-sym)))
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79 (aset vect 2 (append (get i-sym 'messages)
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80 (aref vect 2))))
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81 (aset vect 0 id-sym)
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82 (aset vect 1 date)
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83 ;; this loops _and_ recurses and I'm worried
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84 ;; about it going into a spin someday. So I
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85 ;; unblock interrupts here. It's not critical
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86 ;; that it finish... the summary will just be out
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87 ;; of sync.
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88 (if schedule-reindents
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89 (let ((inhibit-quit nil))
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90 (vm-thread-mark-for-summary-update (aref vect 2)))))
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91 (if (null parent)
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92 (aset (symbol-value subject-sym) 2
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93 (cons (car mp)
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94 (aref (symbol-value subject-sym) 2))))))))
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95 (setq mp (cdr mp) n (1+ n))
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96 (if (zerop (% n modulus))
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97 (vm-unsaved-message "Building threads... %d" n)))
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98 (if (> n modulus)
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99 (vm-unsaved-message "Building threads... done"))))
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100
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101 (defun vm-thread-mark-for-summary-update (message-list)
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102 (while message-list
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103 (vm-mark-for-summary-update (car message-list) t)
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104 (vm-set-thread-list-of (car message-list) nil)
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105 (vm-set-thread-indentation-of (car message-list) nil)
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106 (vm-thread-mark-for-summary-update
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107 (get (intern (vm-su-message-id (car message-list))
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108 vm-thread-obarray)
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109 'children))
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110 (setq message-list (cdr message-list))))
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111
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112 (defun vm-thread-list (message)
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113 (let ((done nil)
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114 (m message)
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115 thread-list id-sym subject-sym loop-sym root-date)
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116 (save-excursion
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117 (set-buffer (vm-buffer-of m))
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118 (setq id-sym (intern (vm-su-message-id m) vm-thread-obarray)
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119 thread-list (list id-sym))
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120 (fillarray vm-thread-loop-obarray 0)
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121 (while (not done)
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122 (setq loop-sym (intern (symbol-name id-sym) vm-thread-loop-obarray))
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123 (if (boundp loop-sym)
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124 ;; loop detected, bail...
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125 (setq done t
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126 thread-list (cdr thread-list))
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127 (set loop-sym t)
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128 (if (and (boundp id-sym) (symbol-value id-sym))
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129 (progn
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130 (setq id-sym (symbol-value id-sym)
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131 thread-list (cons id-sym thread-list)
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132 m (car (get id-sym 'messages))))
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133 (if (null m)
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134 (setq done t)
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135 (if (null vm-thread-using-subject)
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136 nil
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137 (setq subject-sym
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138 (intern (vm-so-sortable-subject m)
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139 vm-thread-subject-obarray))
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140 (if (or (not (boundp subject-sym))
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141 (eq (aref (symbol-value subject-sym) 0) id-sym))
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142 (setq done t)
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143 (setq id-sym (aref (symbol-value subject-sym) 0)
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144 thread-list (cons id-sym thread-list)
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145 m (car (get id-sym 'messages)))))))))
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146 ;; save the date of the oldest message in this thread
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147 (setq root-date (get id-sym 'oldest-date))
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148 (if (or (null root-date)
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149 (string< (vm-so-sortable-datestring message) root-date))
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150 (put id-sym 'oldest-date (vm-so-sortable-datestring message)))
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151 thread-list )))
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152
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153 ;; remove message struct from thread data.
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154 ;;
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155 ;; optional second arg non-nil means forget information that
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156 ;; might be different if the mesage contents changed.
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157 ;;
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158 ;; message must be a real message
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159 (defun vm-unthread-message (message &optional message-changing)
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160 (save-excursion
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161 (let ((mp (cons message (vm-virtual-messages-of message)))
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162 id-sym subject-sym vect p-sym)
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163 (while mp
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164 (let ((inhibit-quit t))
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165 (vm-set-thread-list-of (car mp) nil)
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166 (vm-set-thread-indentation-of (car mp) nil)
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167 (set-buffer (vm-buffer-of (car mp)))
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168 (setq id-sym (intern (vm-su-message-id (car mp)) vm-thread-obarray)
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169 subject-sym (intern (vm-so-sortable-subject (car mp))
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170 vm-thread-subject-obarray))
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171 (if (boundp id-sym)
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172 (progn
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173 (put id-sym 'messages (delq (car mp) (get id-sym 'messages)))
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174 (vm-thread-mark-for-summary-update (get id-sym 'children))
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175 (setq p-sym (symbol-value id-sym))
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176 (and p-sym (put p-sym 'children
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177 (delq (car mp) (get p-sym 'children))))
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178 (if message-changing
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179 (set id-sym nil))))
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180 (if (and (boundp subject-sym) (setq vect (symbol-value subject-sym)))
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181 (if (not (eq id-sym (aref vect 0)))
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182 (aset vect 2 (delq (car mp) (aref vect 2)))
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183 (if message-changing
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184 (if (null (cdr (aref vect 3)))
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185 (makunbound subject-sym)
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186 (let ((p (aref vect 3))
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187 oldest-msg oldest-date children)
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188 (setq oldest-msg (car p)
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189 oldest-date (vm-so-sortable-datestring (car p))
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190 p (cdr p))
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191 (while p
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192 (if (and (string-lessp (vm-so-sortable-datestring (car p))
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193 oldest-date)
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194 (not (eq (car mp) (car p))))
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195 (setq oldest-msg (car p)
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196 oldest-date (vm-so-sortable-datestring (car p))))
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197 (setq p (cdr p)))
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198 (aset vect 0 (intern (vm-su-message-id oldest-msg)
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199 vm-thread-obarray))
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200 (aset vect 1 oldest-date)
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201 (setq children (delq oldest-msg (aref vect 2)))
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202 (aset vect 2 children)
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203 (aset vect 3 (delq (car mp) (aref vect 3)))
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204 ;; I'm not sure there aren't situations
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205 ;; where this might loop forever.
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206 (let ((inhibit-quit nil))
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207 (vm-thread-mark-for-summary-update children))))))))
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208 (setq mp (cdr mp))))))
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209
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210 (defun vm-th-parent (m)
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211 (or (vm-parent-of m)
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212 (vm-set-parent-of
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213 m
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214 (or (let (references)
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215 (setq references (vm-get-header-contents m "References:"))
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216 (and references
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217 (car (vm-last
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218 (vm-parse references "[^<]*\\(<[^>]+>\\)")))))
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219 (let (in-reply-to)
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220 (setq in-reply-to (vm-get-header-contents m "In-Reply-To:"))
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221 (and in-reply-to
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222 (car (vm-parse in-reply-to "[^<]*\\(<[^>]+>\\)"))))))))
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223
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224 (defun vm-th-thread-indentation (m)
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225 (or (vm-thread-indentation-of m)
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226 (let ((p (vm-th-thread-list m)))
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227 (while (and p (null (get (car p) 'messages)))
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228 (setq p (cdr p)))
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229 (vm-set-thread-indentation-of m (1- (length p)))
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230 (vm-thread-indentation-of m))))
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231
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232 (defun vm-th-thread-list (m)
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233 (or (vm-thread-list-of m)
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234 (progn
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235 (vm-set-thread-list-of m (vm-thread-list m))
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236 (vm-thread-list-of m))))
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