#!/usr/bin/perl

use ddb;
use Fcntl qw(:seek);

# defaults
$show_step	= 100;
$col_delim	= "\t";
$row_delim	= "\n";
$key_type	= 'a*';
$val_type	= 'a*';
$show_key	= 1;
$show_val	= 1;
$show_status	= \&ddb::show_status;

sub usage {
  print STDERR join '',
    "Usage:\n",
    "	$0 [options ...] file.ddb\n",
    "Options:\n",
    "	[-k[:type]]            # default type $key_type\n",
    "	[-v[:type]]            # default type $val_type\n",
    "	[-t col_delim]         # default \\t\n",
    "	[-n row_delim]         # default \\n\n",
    "	[-s show_step]         # default 100\n",
    "	[-q]                   # quiet\n",
    ;
  exit 1;
}

@ARGV or usage;
my $db_filename = pop(@ARGV);
-e "$db_filename.meta" and do "$db_filename.meta";

while ($ARGV[0] =~ /^-(.*$)/) {
  my $opt = $1;
  shift(@ARGV);

  $opt eq '-' and last;

  if ($opt =~ /^k/) {
    $opt =~ /^k:(.+$)/ and $key_type = $1;
    $show_val = 0;
    next;
  }

  if ($opt =~ /^v/) {
    $opt =~ /^v:(.+$)/ and $val_type = $1;
    $show_key = 0;
    next;
  }

  if ($opt =~ /^t(.*$)/) {
    $col_delim = $1 || shift(@ARGV) or usage;
    $col_delim = qr/$col_delim/;
    next;
  }

  if ($opt =~ /^n(.*$)/) {
    $row_delim = $1 || shift(@ARGV) or usage;
    next;
  }

  if ($opt =~ /^s(.*$)/) {
    $show_step = $1 || shift(@ARGV) or usage;
    next;
  }

  if ($opt =~ /^c(.*$)/) {
    $hash_size = $1 || shift(@ARGV) or usage;
    next;
  }

  if ($opt eq 'q') {
    $show_status = sub { };
    next;
  }

  usage;
}

@ARGV and usage;

$show_key || $show_val or $show_key = $show_val = 1;
-e $db_filename or die "$0: $db_filename: No such file or directory\n";
my $db = tie %db, ddb, $db_filename, $hash_size or die "$0: $db_filename: $!\n";

select(STDOUT);
$| = 1;

eval {
  while (1) {
    $db->lock_ex;
    my (undef, $k) = $db->next_pos($show_status);
    $show_val && defined $k and my $v = $db{$k};
    $db->lock_un;

    last unless defined $k;

    my $line;
    $show_key and $line .= join($col_delim, unpack $key_type, $k);
    $show_key && $show_val and $line .= $col_delim;
    $show_val and $line .= join($col_delim, unpack $val_type, $v);
    $line .= $row_delim;

    print $line;
  }
};

untie %db;
$@ and die $@;
exit 0;