# downmove.pl - sample script for downgrading inter-codeline moves
#
# This can be run against any client at any time, but an ideal time would be
# right before submit.  Note that if you run this in a change-submit trigger
# and it downgrades the files, submit will fail with a scary error because the
# files got changed under it, but if the submit is retried it'll be fine.
#
# Args: %user% %client% %clienthost%
#
# p4 executable with server port, super user credentials:

$P4      = "p4 -p 1981";
$sUser   = "super";
$sTicket = "532B0A90E2016A2CFEAD4E94BD3AFC15"; # or password

# This function gets the "unit" (component, codeline, etc) that
# a given depot path is part of.  It is expected that all of the
# files within a given unit will stay together during merges.

sub get_unit
{
    # This version returns the leading "//depot/directory/" as the unit.
    # Substitute your own definition here.

    $_[0] =~ /(\/\/[^\/]+\/[^\/]+\/).*/;
    return $1;
}

# Script starts now.

# Login as issuing user so we can mess with their client.

$user   = $ARGV[0];
$client = $ARGV[1];
$host   = $ARGV[2];

$_ = `$P4 -u $sUser -P $sTicket -s login $user`;

if( !/^info:/ )
{
    print "Login $_\n";
    exit 1;
}

# Ticket acquired.  Henceforth we run as that user.

$p4u = "$P4 -u $user -c $client -H $host";

# Get opened files.

@movedDepot  = ();
@movedClient = ();
$unit  = '';
$safe  = 1;
@files = `$p4u -Ztag -F %action%\@%depotFile%\@%clientFile% opened`;
foreach( @files )
{
    chomp;
    next if( !/^move/ );
    if( /^move\/add\@(.+)\@(.+)/ )
    {
        push @movedDepot,  $1;
        push @movedClient, $2;
    }
    s/^move\/[a-z]+://;
    $_ = &get_unit( $_ );
    if   ( $unit eq '' ) { $unit = $_; }
    elsif( $unit ne $_ ) { $safe = 0; break; }
}

if( $safe )
{
    `$p4u logout`;
    exit 0;
}

# If we've gotten this far we know that not all of our moved files
# are in the same unit, so we couldn't do a quick bail.  Now we look
# at the individual moves to see which need downgrading.

@resolves = ();

while( @movedDepot )
{
    $unit = &get_unit( pop @movedDepot );
    $file = pop @movedClient;

    # Resolved gives us the depot "fromFile" for a client "toFile".

    @resolves = `$p4u -F %how%\@%fromFile% resolved $file`;
    foreach( @resolves )
    {
        chomp;
        next if( !/^moved from\@(.+)/ );
	if( &get_unit( $1 ) ne $unit ) { `$p4u -s add -d $file`; }
    }
}

`$p4u logout`;