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+From: david@tethera.net\r
+To: notmuch@notmuchmail.org\r
+Subject: [Patch v4 10/10] tag-util: optimization of tag application\r
+Date: Sat, 8 Dec 2012 11:07:56 -0400\r
+Message-Id: <1354979276-20099-11-git-send-email-david@tethera.net>\r
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+References: <1354979276-20099-1-git-send-email-david@tethera.net>\r
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+Cc: David Bremner <bremner@debian.org>\r
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+\r
+From: David Bremner <bremner@debian.org>\r
+\r
+The idea is not to bother with restore operations if they don't change\r
+the set of tags. This is actually a relatively common case.\r
+\r
+In order to avoid fancy datastructures, this method is quadratic in\r
+the number of tags; at least on my mail database this doesn't seem to\r
+be a big problem.\r
+---\r
+ tag-util.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++\r
+ 1 file changed, 68 insertions(+)\r
+\r
+diff --git a/tag-util.c b/tag-util.c\r
+index 80ebdc2..b68ea50 100644\r
+--- a/tag-util.c\r
++++ b/tag-util.c\r
+@@ -138,6 +138,71 @@ message_error (notmuch_message_t *message,\r
+ fprintf (stderr, "Status: %s\n", notmuch_status_to_string (status));\r
+ }\r
+ \r
++static int\r
++makes_changes (notmuch_message_t *message,\r
++ tag_op_list_t *list,\r
++ tag_op_flag_t flags)\r
++{\r
++\r
++ size_t i;\r
++\r
++ notmuch_tags_t *tags;\r
++ notmuch_bool_t changes = FALSE;\r
++\r
++ /* First, do we delete an existing tag? */\r
++ changes = FALSE;\r
++ for (tags = notmuch_message_get_tags (message);\r
++ ! changes && notmuch_tags_valid (tags);\r
++ notmuch_tags_move_to_next (tags)) {\r
++ const char *cur_tag = notmuch_tags_get (tags);\r
++ int last_op = (flags & TAG_FLAG_REMOVE_ALL) ? -1 : 0;\r
++\r
++ /* scan backwards to get last operation */\r
++ i = list->count;\r
++ while (i > 0) {\r
++ i--;\r
++ if (strcmp (cur_tag, list->ops[i].tag) == 0) {\r
++ last_op = list->ops[i].remove ? -1 : 1;\r
++ break;\r
++ }\r
++ }\r
++\r
++ changes = (last_op == -1);\r
++ }\r
++ notmuch_tags_destroy (tags);\r
++\r
++ if (changes)\r
++ return TRUE;\r
++\r
++ /* Now check for adding new tags */\r
++ for (i = 0; i < list->count; i++) {\r
++ notmuch_bool_t exists = FALSE;\r
++\r
++ if (list->ops[i].remove)\r
++ continue;\r
++\r
++ for (tags = notmuch_message_get_tags (message);\r
++ notmuch_tags_valid (tags);\r
++ notmuch_tags_move_to_next (tags)) {\r
++ const char *cur_tag = notmuch_tags_get (tags);\r
++ if (strcmp (cur_tag, list->ops[i].tag) == 0) {\r
++ exists = TRUE;\r
++ break;\r
++ }\r
++ }\r
++ notmuch_tags_destroy (tags);\r
++\r
++ /* the following test is conservative,\r
++ * in the sense it ignores cases like +foo ... -foo\r
++ * but this is OK from a correctness point of view\r
++ */\r
++ if (! exists)\r
++ return TRUE;\r
++ }\r
++ return FALSE;\r
++\r
++}\r
++\r
+ notmuch_status_t\r
+ tag_op_list_apply (notmuch_message_t *message,\r
+ tag_op_list_t *list,\r
+@@ -147,6 +212,9 @@ tag_op_list_apply (notmuch_message_t *message,\r
+ notmuch_status_t status = 0;\r
+ tag_operation_t *tag_ops = list->ops;\r
+ \r
++ if (! (flags & TAG_FLAG_PRE_OPTIMIZED) && ! makes_changes (message, list, flags))\r
++ return NOTMUCH_STATUS_SUCCESS;\r
++\r
+ status = notmuch_message_freeze (message);\r
+ if (status) {\r
+ message_error (message, status, "freezing message");\r
+-- \r
+1.7.10.4\r
+\r
projects / notmuch-archives.git / commitdiff