Custom Profile for User Roles

Okay ... So, I went through some of the Buddypress code, and found this:

function bp_profile_group_tabs() {
global $bp, $group_name;
if ( !$groups = wp_cache_get( 'xprofile_groups_inc_empty', 'bp' ) ) {
$groups = BP_XProfile_Group::get( array( 'fetch_fields' => true ) );
wp_cache_set( 'xprofile_groups_inc_empty', $groups, 'bp' );
}
if ( empty( $group_name ) )
$group_name = bp_profile_group_name(false);
$tabs = array();
for ( $i = 0, $count = count( $groups ); $i < $count; ++$i ) {
if ( $group_name == $groups[$i]->name )
$selected = ' class="current"';
else
$selected = '';
if ( !empty( $groups[$i]->fields ) ) {
$link = trailingslashit( bp_displayed_user_domain() . $bp->profile->slug . '/edit/group/' . $groups[$i]->id );
$tabs[] = sprintf( '<li %1$s><a href="%2$s">%3$s</a></li>', $selected, $link, esc_html( $groups[$i]->name ) );
}
}
$tabs = apply_filters( 'xprofile_filter_profile_group_tabs', $tabs, $groups, $group_name );
foreach ( (array) $tabs as $tab )
echo $tab;
do_action( 'xprofile_profile_group_tabs' );
}


Which builds out your profile edit tabs, when you create profile groups in the backend.

After I found this, I went to my bp_custom file, and wrote:

add_action( 'xprofile_template_loop_start', 'mar_define_profile_by_role' );
function mar_define_profile_by_role() {
global $current_user;
$user_roles = $current_user->roles;
$user_role = array_shift($user_roles);
if( $user_role == "writer" ) {
//* EXECUTE WRITER SPECIFIC CODE
} elseif( $user_role == "publisher" ) {
//* EXECUTE PUBLISHER SPECIFIC CODE
}
}
`

Can anyone help fill in the blanks?  Basically, from the first code block, I need to figure out how to filter out the specific profile group from the array, with the correct section of my second code block.

EXAMPLE:

I have 2 profile group tabs ... a WRITER tab, and a PUBLISHER tab.  Each tab has user role specific profile fields.

if( $user_role == "writer" ) {
//* EXECUTE WRITER SPECIFIC CODE
//* SOME KIND OF FILTER THAT REMOVES THE PUBLISHER PROFILE GROUP
} elseif( $user_role == "publisher" ) {
//* EXECUTE PUBLISHER SPECIFIC CODE
//* SOME KIND OF FILTER THAT REMOVES THE WRITER PROFILE GROUP
}

Within the first block of code, the piece of code that sticks out the most for me is:

$tabs = apply_filters( 'xprofile_filter_profile_group_tabs', $tabs, $groups, $group_name );
foreach ( (array) $tabs as $tab )
echo $tab;

I think this is the code that actually loops through all the profile groups and spits them onto the page.  If there is an "apply_filters", I should be able to tap into this, right?

What do you think.  Any suggestions?

I'll keep working on this.

Cheers!