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eval '(exit $?0)' && eval 'exec perl -wS "$0" "$@"'
  & eval 'exec perl -wS "$0" $argv:q'
    if 0;

use strict;
use POSIX qw(strftime);
use Getopt::Long qw(:config gnu_getopt no_ignore_case);

my @append_files;
my $force;
my $verbose;
my $changelog_file = 'ChangeLog';

GetOptions('append|a=s@' => \@append_files,
	   'file|F=s' => \$changelog_file,
	   'force|f' => \$force,
	   'verbose|v' => \$verbose) or exit(1);

if (! -d '.git') {
    exit 0;
}

my ($hash, $date) = split / /, `git log --max-count=1 --pretty=format:'%H %ad' --date=short HEAD`;

my @modlines;
if (open(my $fd, '-|', 'git diff-index --name-status HEAD 2>/dev/null')) {
    chomp(@modlines = map {chomp; [split /\s+/, $_, 2]} <$fd>);
    close $fd;
}

if (@modlines) {
    $date = strftime '%Y-%m-%d', localtime;
}

my @header;

push @header, "$date  Automatically generated  <bug-mailutils\@gnu.org>";
push @header, '';
push @header, "\tHEAD $hash";
push @header, '';

my %status = (
    A => 'New file',
    C => 'Copied file',
    D => 'Removed file',
    M => 'Changed',
    R => 'Renamed',
    T => 'Type change',
    U => 'Unmerged',
    X => 'Unknown'
);

if (@modlines) {
    push @header, "\tUncommitted changes:";
    push @header, '';

    push @header, map {
	"\t* $_->[1]: " . ($status{$_->[0]} || 'Unknown') . ";"
    } @modlines;
    push @header, '';
}

sub headcmp {
    my $file = shift;
    if (open(my $fd, '<', $changelog_file)) {
	while (<$fd>) {
	    my $line = shift;
	    last unless defined($line);
	    chomp;
	    return 0 unless $line eq $_;
	}
	return 1 unless @_;
    }
    return 0;
}

if (!$force && headcmp($changelog_file, @header)) {
    exit 0;
}

print "  GEN $changelog_file\n" if $verbose;
close STDOUT;

open(STDOUT, '>', $changelog_file)
    or die "Can't open $changelog_file for writing: $!";

for (@header) {
    print "$_\n";
}

system(@ARGV);
foreach my $file (@append_files) {
    if (open(my $fd, '<', $file)) {
	while (<$fd>) {
	    chomp;
	    last if /^Local Variables:/;
	    next if /^\f$/;
	    print "$_\n";
	}
	close $fd;
    } else {
	warn "can't open $file: $!";
    }
}

print "\f\nLocal Variables:\n";
print <<'EOT';
mode: change-log
version-control: never
buffer-read-only: t
End:
EOT
;

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