From 87d944b6039667735884e37baff4f9fa94aca5db Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sun, 19 May 2024 21:55:01 +0000
Subject: [PATCH] config: dedupe ibx->{newsgroup}

We definitely use newsgroup names as hash keys, so get rid
of the duplicate value for some memory savings when we have
hundreds or thousands of newsgroups.
---
 lib/PublicInbox/Config.pm | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index 49659a2e6..e18439120 100644
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -517,7 +517,9 @@ sub _fill_ibx {
 			delete $ibx->{newsgroup};
 			warn "newsgroup name invalid: `$ngname'\n";
 		} else {
-			my $lc = $ibx->{newsgroup} = lc $ngname;
+			%dedupe = (lc($ngname) => undef);
+			my ($lc) = keys %dedupe;
+			$ibx->{newsgroup} = $lc;
 			warn <<EOM if $lc ne $ngname;
 W: newsgroup=`$ngname' lowercased to `$lc'
 EOM
-- 
2.47.2