Websites/bugs.webkit.org/extensions/Trac/Extension.pm

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package Bugzilla::Extension::Trac;

use strict;
use warnings;

use parent qw(Bugzilla::Extension);

our $VERSION = "1.0.0";

sub bug_format_comment {
    my ($self, $args) = @_;
    my $regexes = $args->{'regexes'};

    # Should match "r12345" and "trac.webkit.org/r12345" but not "https://trac.webkit.org/r12345"
    push(@$regexes, { match => qr/(?<!\/)\b((r[[:digit:]]{5,}))\b/, replace => \&_replace_revision });
    push(@$regexes, { match => qr/(?<!\/)(trac.webkit.org\/(r[[:digit:]]{5,}))\b/, replace => \&_replace_revision });
}

sub _replace_revision {
    my $args = shift;
    my $text = $args->{matches}->[0];
    my $revision = $args->{matches}->[1];
    return qq{<a href="https://trac.webkit.org/$revision">$text</a>};
};

# This must be the last line of your extension.
__PACKAGE__->NAME;