1 files changed, 4 insertions, 3 deletions
diff --git a/lib/PublicInbox/LeiOverview.pm b/lib/PublicInbox/LeiOverview.pm
index c820f0d7..3169bae6 100644
--- a/lib/PublicInbox/LeiOverview.pm
+++ b/lib/PublicInbox/LeiOverview.pm
@@ -51,18 +51,19 @@ sub detect_fmt ($$) {
  }
  
  sub new {
-        my ($class, $lei) = @_;
+        my ($class, $lei, $ofmt_key) = @_;
          my $opt = $lei->{opt};
          my $dst = $opt->{output} // '-';
          $dst = '/dev/stdout' if $dst eq '-';
+        $ofmt_key //= 'format';
  
-        my $fmt = $opt->{'format'};
+        my $fmt = $opt->{$ofmt_key};
          $fmt = lc($fmt) if defined $fmt;
          if ($dst =~ s/\A([a-z0-9]+)://is) { # e.g. Maildir:/home/user/Mail/
                  my $ofmt = lc $1;
                  $fmt //= $ofmt;
                  return $lei->fail(<<"") if $fmt ne $ofmt;
---format=$fmt and --output=$ofmt conflict
+--$ofmt_key=$fmt and --output=$ofmt conflict
  
          }
          $fmt //= 'json' if $dst eq '/dev/stdout';