[RFC PATCH] cli: add --remove-all option to "notmuch tag"

[Jani Nikula]

Add --remove-all option to "notmuch tag" to remove all tags matching
query before applying the tag changes. This allows removal and
unconditional setting of the tags of a message:

$ notmuch tag --remove-all id:foo at example.com
$ notmuch tag --remove-all +foo +bar id:foo at example.com

without having to resort to the complicated (and still quoting broken):

$ notmuch tag $(notmuch search --output=tags '*' | sed 's/^/-/') id:foo at example.com
$ notmuch tag $(notmuch search --output=tags '*' | sed 's/^/-/') +foo +bar id:foo at example.com

---

It's completely untested...

This is on top of David's batch tagging branch new-tagging at
git://pivot.cs.unb.ca/notmuch.git

If there's interest, I'll spin a new version with tests and man page
changes after David's stuff has been merged.
---
 notmuch-tag.c |   32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/notmuch-tag.c b/notmuch-tag.c
index e4fca67..67624cc 100644
--- a/notmuch-tag.c
+++ b/notmuch-tag.c
@@ -119,12 +119,15 @@ tag_query (void *ctx, notmuch_database_t *notmuch, const char *query_string,
     notmuch_messages_t *messages;
     notmuch_message_t *message;
 
-    /* Optimize the query so it excludes messages that already have
-     * the specified set of tags. */
-    query_string = _optimize_tag_query (ctx, query_string, tag_ops);
-    if (query_string == NULL) {
-	fprintf (stderr, "Out of memory.\n");
-	return 1;
+    if (! (flags & TAG_FLAG_REMOVE_ALL)) {
+	/* Optimize the query so it excludes messages that already
+	 * have the specified set of tags. */
+	query_string = _optimize_tag_query (ctx, query_string, tag_ops);
+	if (query_string == NULL) {
+	    fprintf (stderr, "Out of memory.\n");
+	    return 1;
+	}
+	flags |= TAG_FLAG_PRE_OPTIMIZED;
     }
 
     query = notmuch_query_create (notmuch, query_string);
@@ -140,7 +143,7 @@ tag_query (void *ctx, notmuch_database_t *notmuch, const char *query_string,
 	 notmuch_messages_valid (messages) && ! interrupted;
 	 notmuch_messages_move_to_next (messages)) {
 	message = notmuch_messages_get (messages);
-	tag_op_list_apply (message, tag_ops, flags | TAG_FLAG_PRE_OPTIMIZED);
+	tag_op_list_apply (message, tag_ops, flags);
 	notmuch_message_destroy (message);
     }
 
@@ -157,8 +160,9 @@ notmuch_tag_command (void *ctx, int argc, char *argv[])
     notmuch_config_t *config;
     notmuch_database_t *notmuch;
     struct sigaction action;
-    tag_op_flag_t synchronize_flags = TAG_FLAG_NONE;
+    tag_op_flag_t flags = TAG_FLAG_NONE;
     notmuch_bool_t batch = FALSE;
+    notmuch_bool_t remove_all = FALSE;
     FILE *input = stdin;
     char *input_file_name = NULL;
     int i, opt_index;
@@ -174,6 +178,7 @@ notmuch_tag_command (void *ctx, int argc, char *argv[])
     notmuch_opt_desc_t options[] = {
 	{ NOTMUCH_OPT_BOOLEAN, &batch, "batch", 0, 0 },
 	{ NOTMUCH_OPT_STRING, &input_file_name, "input", 'i', 0 },
+	{ NOTMUCH_OPT_BOOLEAN, &remove_all, "remove-all", 0, 0 },
 	{ 0, 0, 0, 0, 0 }
     };
 
@@ -230,7 +235,7 @@ notmuch_tag_command (void *ctx, int argc, char *argv[])
 	    }
 	}
 
-	if (tag_op_list_size (tag_ops) == 0) {
+	if (tag_op_list_size (tag_ops) == 0 && !remove_all) {
 	    fprintf (stderr, "Error: 'notmuch tag' requires at least one tag to add or remove.\n");
 	    return 1;
 	}
@@ -252,7 +257,10 @@ notmuch_tag_command (void *ctx, int argc, char *argv[])
 	return 1;
 
     if (notmuch_config_get_maildir_synchronize_flags (config))
-	synchronize_flags = TAG_FLAG_MAILDIR_SYNC;
+	flags |= TAG_FLAG_MAILDIR_SYNC;
+
+    if (remove_all)
+	flags |= TAG_FLAG_REMOVE_ALL;
 
     if (batch) {
 
@@ -280,14 +288,14 @@ notmuch_tag_command (void *ctx, int argc, char *argv[])
 		continue;
 
 	    if (ret < 0 || tag_query (ctx, notmuch, query_string,
-				      tag_ops, synchronize_flags))
+				      tag_ops, flags))
 		break;
 	}
 
 	if (line)
 	    free (line);
     } else
-	ret = tag_query (ctx, notmuch, query_string, tag_ops, synchronize_flags);
+	ret = tag_query (ctx, notmuch, query_string, tag_ops, flags);
 
     notmuch_database_destroy (notmuch);
 
-- 
1.7.10.4