eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
  & eval 'exec perl -S $0 $argv:q'
  if 0;
#  THE PRECEEDING STUFF EXECS perl via $PATH
# -*-Fundamental-*-

#  $Id: //depot/clients/atg/cvs2p4/main/bin/dbdump#2 $
#
#  Richard Geiger
#

require 5.000;

use Carp; # ...or flounder. (This will fail unless 'perl' is a perl5!)
$| = 1;

($Myname = $0) =~ s%^.*/%%;
$Mydir = $0;
$Mydir = '../lib' unless ($Mydir =~ s#bin/[^/]*$#lib#);
require "$Mydir/util.pl";


sub usage
{
  print <<_EOF_;
Usage: $Myname [ -c hints -v ] conversiondir

    -c hints    list the codelines to check for label revisions
    -v       	increase the verbosity (can use multiple times)
    -h          print this message
_EOF_
  exit $_[0];
}

sub verbose {
    my $level = @_ > 1 ? shift : 1;
    print @_, "\n" if $level <= $V;
}

# Parsing functions

sub find_match {
    my ($cvsrev, $label, $realbr) = @_;
    my $p4rev = '';
    if ($HINTS{$label}) {
	my $key = '';
        for my $codeline (@{$HINTS{$label}}) {
	    $key = "$codeline$cvsrev";
	    $p4rev = $CVSREV{$key}, last if $CVSREV{$key};
        }
        if ($p4rev) {
	    verbose 2, "codeline match $key: $p4rev";
        }
    }
    unless ($p4rev) {
	$p4rev = $CVSREV{"$realbr$cvsrev"};
	verbose 2, "literal match $realbr$cvsrev: $p4rev";
	$NOGUESS{$label}->{"$realbr$cvsrev"} = $p4rev if $cfile;
    } 
    die "no match found for $label $realbr $cvsrev\n" unless $p4rev;
    return $p4rev;
}

sub convert {
    my ($label) = @_;
    open(CL, "<$CVSLabels/$label") or die "can't open CVS label $label: $!";
    open(PL, ">$P4Labels/$label") or die "can't open P4 label $label: $!";
    while (<CL>) {
	chomp;
	my ($cvsrev, $realbr) = split "$S";
	verbose "mapping: $cvsrev $realbr";
	print PL find_match($cvsrev, $label, $realbr), "\n";
    }
    close CL;
    close PL;
}

# option switch variables get defaults here...

$V = 0;
$cfile = '';
$help = 0;

use Getopt::Long;
GetOptions(
    "codelines=s" => \$cfile,
    "help"      => \$help,
    "v+"        => \$V
) || usage(1);
$help && usage(0);

$Convdir = shift || usage(1);

$Revlog = "$Convdir/revlog";
$CVSLabels = "$Convdir/labels/cvs";
$P4Labels  = "$Convdir/labels/p4";

# Read in the codeline maps
#
if ($cfile) {
    open HINTS, "<$cfile" or die "can't open codeline hints $cfile: $!";
    while (<HINTS>) {
	chomp;
	next if /^#/;
	next if /^\s*$/;
	verbose "using codeline hint: $_";
	my ($label, @codelines) = split /\s+/;
	$HINTS{$label} = [ @codelines ];
    }
    close HINTS;
}

# Read in the revisions
#
%CVSREV = ();
%NOGUESS = ();

open REVLOG, "<$Revlog" or die "can't open $Revlog: $!";
while (<REVLOG>) {
    my ($p4rev, $br, $cvsrev) = split "$S";
    verbose 3, "using: $p4rev $br $cvsrev";
    $CVSREV{"$br$cvsrev"} = $p4rev;
}
close REVLOG;

# loop over each cvs label file and convert them
#
opendir(CVSLABELS, $CVSLabels) or die "can't open directory $CVSLabels: $!";
for my $label (readdir(CVSLABELS)) {
    next if $label =~ /\.\.?/;
    verbose "converting $label";
    convert($label);
}
closedir(CVSLABELS);

# mention labels that may have unwanted mappings
#
for my $label (keys %NOGUESS) {
    print STDERR "some files in $label didn't find a codeline match\n";
    if ($V > 1) {
	print STDERR "They were:\n";
	while (my ($cvs, $p4) = each %{$NOGUESS{$label}}) {
	    print STDERR "  $cvs\n    $p4\n";
	}
    }
}