X-Git-Url: https://git.notmuchmail.org/git?p=notmuch;a=blobdiff_plain;f=tag-util.c;h=17d7ac2f28ace0fa377bfb069fdff06fcabb36e9;hp=6d33ef8f3010be5ebf7fe932c23a5db4b9245d09;hb=5a1b22e2bcc1d5321aa085f559c4550d831d9163;hpb=fb50cc41fe6f508118697d65a44e8f742a466ca0

diff --git a/tag-util.c b/tag-util.c
index 6d33ef8f..17d7ac2f 100644
--- a/tag-util.c
+++ b/tag-util.c
@@ -40,14 +40,14 @@ parse_tag_line (void *ctx, char *line,
     char *tok = line;
     size_t tok_len = 0;
     char *line_for_error;
-    int ret = 0;
+    tag_parse_status_t ret = TAG_PARSE_SUCCESS;
 
     chomp_newline (line);
 
     line_for_error = talloc_strdup (ctx, line);
     if (line_for_error == NULL) {
 	fprintf (stderr, "Error: out of memory\n");
-	return -1;
+	return TAG_PARSE_OUT_OF_MEMORY;
     }
 
     /* remove leading space */
@@ -109,7 +109,7 @@ parse_tag_line (void *ctx, char *line,
 	    goto DONE;
 	}
 
-	if (tag_op_list_append (ctx, tag_ops, tag, remove)) {
+	if (tag_op_list_append (tag_ops, tag, remove)) {
 	    ret = line_error (TAG_PARSE_OUT_OF_MEMORY, line_for_error,
 			      "aborting");
 	    goto DONE;
@@ -151,6 +151,71 @@ message_error (notmuch_message_t *message,
     fprintf (stderr, "Status: %s\n", notmuch_status_to_string (status));
 }
 
+static int
+makes_changes (notmuch_message_t *message,
+	       tag_op_list_t *list,
+	       tag_op_flag_t flags)
+{
+
+    size_t i;
+
+    notmuch_tags_t *tags;
+    notmuch_bool_t changes = FALSE;
+
+    /* First, do we delete an existing tag? */
+    changes = FALSE;
+    for (tags = notmuch_message_get_tags (message);
+	 ! changes && notmuch_tags_valid (tags);
+	 notmuch_tags_move_to_next (tags)) {
+	const char *cur_tag = notmuch_tags_get (tags);
+	int last_op =  (flags & TAG_FLAG_REMOVE_ALL) ? -1 : 0;
+
+	/* scan backwards to get last operation */
+	i = list->count;
+	while (i > 0) {
+	    i--;
+	    if (strcmp (cur_tag, list->ops[i].tag) == 0) {
+		last_op = list->ops[i].remove ? -1 : 1;
+		break;
+	    }
+	}
+
+	changes = (last_op == -1);
+    }
+    notmuch_tags_destroy (tags);
+
+    if (changes)
+	return TRUE;
+
+    /* Now check for adding new tags */
+    for (i = 0; i < list->count; i++) {
+	notmuch_bool_t exists = FALSE;
+
+	if (list->ops[i].remove)
+	    continue;
+
+	for (tags = notmuch_message_get_tags (message);
+	     notmuch_tags_valid (tags);
+	     notmuch_tags_move_to_next (tags)) {
+	    const char *cur_tag = notmuch_tags_get (tags);
+	    if (strcmp (cur_tag, list->ops[i].tag) == 0) {
+		exists = TRUE;
+		break;
+	    }
+	}
+	notmuch_tags_destroy (tags);
+
+	/* the following test is conservative,
+	 * in the sense it ignores cases like +foo ... -foo
+	 * but this is OK from a correctness point of view
+	 */
+	if (! exists)
+	    return TRUE;
+    }
+    return FALSE;
+
+}
+
 notmuch_status_t
 tag_op_list_apply (notmuch_message_t *message,
 		   tag_op_list_t *list,
@@ -160,6 +225,9 @@ tag_op_list_apply (notmuch_message_t *message,
     notmuch_status_t status = 0;
     tag_operation_t *tag_ops = list->ops;
 
+    if (! (flags & TAG_FLAG_PRE_OPTIMIZED) && ! makes_changes (message, list, flags))
+	return NOTMUCH_STATUS_SUCCESS;
+
     status = notmuch_message_freeze (message);
     if (status) {
 	message_error (message, status, "freezing message");
@@ -226,7 +294,7 @@ tag_op_list_create (void *ctx)
     list->size = TAG_OP_LIST_INITIAL_SIZE;
     list->count = 0;
 
-    list->ops = talloc_array (ctx, tag_operation_t, list->size);
+    list->ops = talloc_array (list, tag_operation_t, list->size);
     if (list->ops == NULL)
 	return NULL;
 
@@ -235,8 +303,7 @@ tag_op_list_create (void *ctx)
 
 
 int
-tag_op_list_append (void *ctx,
-		    tag_op_list_t *list,
+tag_op_list_append (tag_op_list_t *list,
 		    const char *tag,
 		    notmuch_bool_t remove)
 {
@@ -246,7 +313,7 @@ tag_op_list_append (void *ctx,
 
     if (list->count == list->size) {
 	list->size *= 2;
-	list->ops = talloc_realloc (ctx, list->ops, tag_operation_t,
+	list->ops = talloc_realloc (list, list->ops, tag_operation_t,
 				    list->size);
 	if (list->ops == NULL) {
 	    fprintf (stderr, "Out of memory.\n");