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30 id 1TgmiZ-0004kz-Vb; Thu, 06 Dec 2012 21:27:08 -0400
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31 From: david@tethera.net
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32 To: notmuch@notmuchmail.org
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33 Subject: [Patch v3b 9/9] tag-util: optimization of tag application
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34 Date: Thu, 6 Dec 2012 21:26:47 -0400
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35 Message-Id: <1354843607-17980-10-git-send-email-david@tethera.net>
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37 In-Reply-To: <1354843607-17980-1-git-send-email-david@tethera.net>
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38 References: <1354843607-17980-1-git-send-email-david@tethera.net>
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40 Cc: David Bremner <bremner@debian.org>
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41 X-BeenThere: notmuch@notmuchmail.org
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45 <notmuch.notmuchmail.org>
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55 From: David Bremner <bremner@debian.org>
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57 The idea is not to bother with restore operations if they don't change
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58 the set of tags. This is actually a relatively common case.
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60 In order to avoid fancy datastructures, this method is quadratic in
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61 the number of tags; at least on my mail database this doesn't seem to
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64 tag-util.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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65 1 file changed, 66 insertions(+)
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67 diff --git a/tag-util.c b/tag-util.c
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68 index 932ee7f..3d54e9e 100644
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71 @@ -124,6 +124,69 @@ message_error (notmuch_message_t *message,
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72 fprintf (stderr, "Status: %s\n", notmuch_status_to_string (status));
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76 +makes_changes (notmuch_message_t *message,
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77 + tag_op_list_t *list,
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78 + tag_op_flag_t flags)
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83 + notmuch_tags_t *tags;
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84 + notmuch_bool_t changes = FALSE;
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86 + /* First, do we delete an existing tag? */
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88 + for (tags = notmuch_message_get_tags (message);
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89 + ! changes && notmuch_tags_valid (tags);
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90 + notmuch_tags_move_to_next (tags)) {
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91 + const char *cur_tag = notmuch_tags_get (tags);
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92 + int last_op = (flags & TAG_FLAG_REMOVE_ALL) ? -1 : 0;
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94 + /* slight contortions to count down with an unsigned index */
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95 + for (i = list->count; i-- > 0; /*nothing*/) {
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96 + if (strcmp (cur_tag, list->ops[i].tag) == 0) {
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97 + last_op = list->ops[i].remove ? -1 : 1;
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102 + changes = (last_op == -1);
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104 + notmuch_tags_destroy (tags);
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109 + /* Now check for adding new tags */
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110 + for (i = 0; i < list->count; i++) {
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111 + notmuch_bool_t exists = FALSE;
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113 + if (list->ops[i].remove)
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116 + for (tags = notmuch_message_get_tags (message);
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117 + notmuch_tags_valid (tags);
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118 + notmuch_tags_move_to_next (tags)) {
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119 + const char *cur_tag = notmuch_tags_get (tags);
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120 + if (strcmp (cur_tag, list->ops[i].tag) == 0) {
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125 + notmuch_tags_destroy (tags);
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127 + /* the following test is conservative,
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128 + * in the sense it ignores cases like +foo ... -foo
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129 + * but this is OK from a correctness point of view
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139 tag_op_list_apply (notmuch_message_t *message,
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140 tag_op_list_t *list,
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141 @@ -133,6 +196,9 @@ tag_op_list_apply (notmuch_message_t *message,
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142 notmuch_status_t status = 0;
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143 tag_operation_t *tag_ops = list->ops;
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145 + if (! (flags & TAG_FLAG_PRE_OPTIMIZED) && ! makes_changes (message, list, flags))
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146 + return NOTMUCH_STATUS_SUCCESS;
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148 status = notmuch_message_freeze (message);
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150 message_error (message, status, "freezing message");
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