[PATCH 3/4] lib: index the content type of signature parts

[Jani Nikula]

It's useful (*) to be able to easily find messages with certain types
of signatures. Having the mimetype: prefix searches fail for some
content types is also genuinely surprising (*). Index the content type
of signature parts.

While at it, switch to the gmime convenience constants for content and
signature part indexes.

*) At least for developers of email software!
---
 lib/index.cc        | 11 +++++++----
 test/T350-crypto.sh |  1 -
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/lib/index.cc b/lib/index.cc
index 64bc92a5b56d..0beaae62f048 100644
--- a/lib/index.cc
+++ b/lib/index.cc
@@ -398,12 +398,15 @@ _index_mime_part (notmuch_message_t *message,
 
 	for (i = 0; i < g_mime_multipart_get_count (multipart); i++) {
 	    if (GMIME_IS_MULTIPART_SIGNED (multipart)) {
-		/* Don't index the signature. */
-		if (i == 1)
+		/* Don't index the signature, but index its content type. */
+		if (i == GMIME_MULTIPART_SIGNED_SIGNATURE) {
+		    _index_content_type (message,
+					 g_mime_multipart_get_part (multipart, i));
 		    continue;
-		if (i > 1)
+		} else if (i != GMIME_MULTIPART_SIGNED_CONTENT) {
 		    _notmuch_database_log (_notmuch_message_database (message),
-					  "Warning: Unexpected extra parts of multipart/signed. Indexing anyway.\n");
+					   "Warning: Unexpected extra parts of multipart/signed. Indexing anyway.\n");
+		}
 	    }
 	    if (GMIME_IS_MULTIPART_ENCRYPTED (multipart)) {
 		/* Don't index encrypted parts. */
diff --git a/test/T350-crypto.sh b/test/T350-crypto.sh
index 2f1f9ce4913c..b8f862560006 100755
--- a/test/T350-crypto.sh
+++ b/test/T350-crypto.sh
@@ -38,7 +38,6 @@ test_expect_success \
     "(mml-secure-message-sign)"'
 
 test_begin_subtest "signed part content-type indexing"
-test_subtest_known_broken
 output=$(notmuch search mimetype:multipart/signed and mimetype:application/pgp-signature | notmuch_search_sanitize)
 test_expect_equal "$output" "thread:XXX   2000-01-01 [1/1] Notmuch Test Suite; test signed message 001 (inbox signed)"
 
-- 
2.11.0