Use reverse video not colors for topic change when disabled

`-H 0,0`/"hash = 0,0" makes catgirl mostly colorless which is great,
but topic changes still hardcode brown/green colors to show differences
which is usually not desired by users (like me) disabling colors.

Go for a less eye stressing topic change message that shows both old
and new in reverse video with default terminal colors.

This isn't perfect, other parts of catgirl still hardcode colors and
`-H 0,0`/"hash = 0,0" was never meant to disable colors completely, but
topics change often enough that avoiding less readable^Waccessible topic
diffs seems sensible enough.

NB: parseHash() is brittle and "0,0" is not the only value disabling
colors...

1 files changed, 5 insertions, 0 deletions

diff --git a/handle.c b/handle.c
index 09b28d5..2607420 100644
--- a/handle.c
+++ b/handle.c
@@ -662,6 +662,11 @@ static void handleTopic(struct Message *msg) {
 	if (swprintf(old, ARRAY_LEN(old), L"%s", prev) < 0) goto plain;
 	if (swprintf(new, ARRAY_LEN(new), L"%s", msg->params[1]) < 0) goto plain;
 
+	if (!hashBound) {
+		catf(&cat, "%c%ls%c -> %c%ls%c", R, old, O, R, new, O);
+		goto plain;
+	}
+
 	size_t pre;
 	for (pre = 0; old[pre] && new[pre] && old[pre] == new[pre]; ++pre);
 	wchar_t *osuf = &old[wcslen(old)];