diff options
| -rw-r--r-- | NEWS | 13 | ||||
| -rw-r--r-- | notmuch-tag.c | 85 |
2 files changed, 98 insertions, 0 deletions
@@ -1,3 +1,16 @@ +Notmuch 0.11 (201x-xx-xx) +========================= + +Performance +----------- + +Automatic tag query optimization + + "notmuch tag" now automatically optimizes the user's query to + exclude messages whose tags won't change. In the past, we've + suggested that people do this by hand; this is no longer necessary. + + Notmuch 0.10.1 (2011-11-25) =========================== diff --git a/notmuch-tag.c b/notmuch-tag.c index dded39ea..537d5a4d 100644 --- a/notmuch-tag.c +++ b/notmuch-tag.c @@ -30,6 +30,81 @@ handle_sigint (unused (int sig)) interrupted = 1; } +static char * +_escape_tag (char *buf, const char *tag) +{ + const char *in = tag; + char *out = buf; + /* Boolean terms surrounded by double quotes can contain any + * character. Double quotes are quoted by doubling them. */ + *out++ = '"'; + while (*in) { + if (*in == '"') + *out++ = '"'; + *out++ = *in++; + } + *out++ = '"'; + *out = 0; + return buf; +} + +static char * +_optimize_tag_query (void *ctx, const char *orig_query_string, char *argv[], + int *add_tags, int add_tags_count, + int *remove_tags, int remove_tags_count) +{ + /* This is subtler than it looks. Xapian ignores the '-' operator + * at the beginning both queries and parenthesized groups and, + * furthermore, the presence of a '-' operator at the beginning of + * a group can inhibit parsing of the previous operator. Hence, + * the user-provided query MUST appear first, but it is safe to + * parenthesize and the exclusion part of the query must not use + * the '-' operator (though the NOT operator is fine). */ + + char *escaped, *query_string; + const char *join = ""; + int i; + unsigned int max_tag_len = 0; + + /* Allocate a buffer for escaping tags. This is large enough to + * hold a fully escaped tag with every character doubled plus + * enclosing quotes and a NUL. */ + for (i = 0; i < add_tags_count; i++) + if (strlen (argv[add_tags[i]] + 1) > max_tag_len) + max_tag_len = strlen (argv[add_tags[i]] + 1); + for (i = 0; i < remove_tags_count; i++) + if (strlen (argv[remove_tags[i]] + 1) > max_tag_len) + max_tag_len = strlen (argv[remove_tags[i]] + 1); + escaped = talloc_array(ctx, char, max_tag_len * 2 + 3); + if (!escaped) + return NULL; + + /* Build the new query string */ + if (strcmp (orig_query_string, "*") == 0) + query_string = talloc_strdup (ctx, "("); + else + query_string = talloc_asprintf (ctx, "( %s ) and (", orig_query_string); + + for (i = 0; i < add_tags_count && query_string; i++) { + query_string = talloc_asprintf_append_buffer ( + query_string, "%snot tag:%s", join, + _escape_tag (escaped, argv[add_tags[i]] + 1)); + join = " or "; + } + for (i = 0; i < remove_tags_count && query_string; i++) { + query_string = talloc_asprintf_append_buffer ( + query_string, "%stag:%s", join, + _escape_tag (escaped, argv[remove_tags[i]] + 1)); + join = " or "; + } + + if (query_string) + query_string = talloc_strdup_append_buffer (query_string, ")"); + + talloc_free (escaped); + return query_string; +} + int notmuch_tag_command (void *ctx, unused (int argc), unused (char *argv[])) { @@ -93,6 +168,16 @@ notmuch_tag_command (void *ctx, unused (int argc), unused (char *argv[])) return 1; } + /* Optimize the query so it excludes messages that already have + * the specified set of tags. */ + query_string = _optimize_tag_query (ctx, query_string, argv, + add_tags, add_tags_count, + remove_tags, remove_tags_count); + if (query_string == NULL) { + fprintf (stderr, "Out of memory.\n"); + return 1; + } + config = notmuch_config_open (ctx, NULL, NULL); if (config == NULL) return 1; |