treewide: run update-copyrights from gnulib for 2019

[public-inbox.git] / lib / PublicInbox / ContentId.pm

diff --git a/lib/PublicInbox/ContentId.pm b/lib/PublicInbox/ContentId.pm
index eb937a0e722982937f4a93619c00330f7b4d15b2..8d77934f20a51665f974da408d7195f26509ec15 100644 (file)
--- a/lib/PublicInbox/ContentId.pm
+++ b/lib/PublicInbox/ContentId.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2018-2019 all contributors <meta@public-inbox.org>
+# Copyright (C) 2018-2020 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
 # Unstable internal API.
@@ -60,15 +60,11 @@ sub content_digest ($) {
        # References: and In-Reply-To: get used interchangeably
        # in some "duplicates" in LKML.  We treat them the same
        # in SearchIdx, so treat them the same for this:
-       my %seen;
-       foreach my $mid (@{mids($hdr)}) {
-               # do NOT consider the Message-ID as part of the content_id
-               # if we got here, we've already got Message-ID reuse
-               $seen{$mid} = 1;
-       }
+       # do NOT consider the Message-ID as part of the content_id
+       # if we got here, we've already got Message-ID reuse
+       my %seen = map { $_ => 1 } @{mids($hdr)};
        foreach my $mid (@{references($hdr)}) {
-               next if $seen{$mid};
-               $dig->add("ref\0$mid\0");
+               $dig->add("ref\0$mid\0") unless $seen{$mid}++;
        }
 
        # Only use Sender: if From is not present