+ my @headers;
+ my $prefix = 0;
+
+ LINE:
+ for (split /\n/) {
+ next if not /\S/;
+ my @header = m{
+ ^
+ (?<key> $HEADERMATCH)
+ : \s*
+ (?<val> \S .+)
+ $
+ }imx or do {
+ $prefix++;
+ next LINE;
+ };
+
+ push @header, $_ if defined $opt{max};
+
+ if ($opt{fuzzy}) {
+ for ($header[0]) {
+ tr/ _/-/;
+
+ state $BY = qr{ (?: -? b[yu] )? \Z }ix;
+ s{^ si (?:ge?n|n?g) (?:e?[dt])? -? (?:of+)? $BY}{Signed-off-by}ix;
+ s{^ ack (?:ed|de)? $BY}{Acked-by}ix;
+ s{^ review (?:e?d)? $BY}{Reviewed-by}ix;
+ s{^ teste[dt] $BY}{Tested-by}ix;
+ }
+ }
+
+ if (defined $opt{grep}) {
+ $_ ~~ qr/$opt{grep}/i or next LINE;
+ }
+
+ given ($opt{simplify} // 'none') {
+ when (['email', 'authors']) {
+ $header[1] =~ s{
+ \A
+ (?: [^:;]+ )?
+ < [^@>]+ (?: @ | \h?\W? at \W?\h? ) [a-z0-9.-]+ >
+ \Z
+ }{<...>}imsx;
+ }
+ when (['var', 'vars', '']) {
+ when ($header[0] =~ /[ _-] (?: by | to ) $ | ^cc$/imsx) {
+ $header[1] = undef;
+ }
+ for ($header[1]) {
+ s{\b (https?)://\S+ }{[$1]}gmsx; # url
+ s{(?: < | \A ) [^@>\s]+ @ [^>]+ (?: > | \Z )}{<...>}igmsx; # address
+ s{\b [0-9]+ \b}{[num]}gmsx; # number
+ s{\b [Ig]? [0-9a-f]{ 40} \b}{[sha1]}gmsx; # hash
+ s{\b [Ig]? [0-9a-f]{6,40} \b}{[hash]}gmsx; # abbrev
+ }
+ }
+ when (['all', 'contents']) {
+ $header[1] = undef;
+ }
+ when (['none', 'no', '0']) {
+ }
+ default {
+ die "Unknown simplify option: '$_'\n";
+ }
+ }
+
+ if ($opt{'ignore-case'}) {
+ $_ = lc for $header[0], $header[1] // ();
+ }
+
+ pop @header if not defined $header[-1];
+
+ push @headers, \@header;
+ }
+
+ next BLOCK if not @headers;
+
+ if ($opt{debug} and $prefix) {
+ say sprintf ': invalid lines in %s (%s)', $hash // 'block', $prefix;
+ }
+
+ for (@headers) {
+ my $line = $_->[2] // join(': ', @$_);
+ $line =~ s/^/$hash / if defined $hash;
+
+ if (defined $opt{min} or $opt{max} or $opt{count}) {
+ my $counter = \$headercount{ $_->[0] }->{ $_->[1] // '' };
+ my $excess = $$counter++ - ($opt{min} // 0);
+ next if $excess >= ($opt{max} || 1);
+ next if $excess < 0;
+ if ($opt{count}) {
+ push @headercache, [ $line, $excess ? \undef : $counter ];
+ next;
+ }
+ }
+ say $line;
+ }
+
+ last BLOCK;