I'll help you do it with plug-ins:
Hook: bbcode_create
Title: [user] BBCode
PHP Code:
if ($this->is_wysiwyg()) $this->unparsed_tags[] = 'user';
if (!function_exists('nex_fetch_musername'))
{
function nex_fetch_musername(&$parser, $userid, $title='')
{
global $vbulletin, $db;
# check if we have a username or userid
$wesearch = is_numeric($userid) ? 'userid' : 'username';
if($user = $db->query_first_slave("
SELECT * FROM " . TABLE_PREFIX . "user
WHERE " . $wesearch . " = '" . $userid . "'
"))
{
$musername = fetch_musername($user);
return '<a href="' . $vbulletin->options['bburl'] . '/member.php?u=' . $user['userid'] . '">' . $musername . '</a>';
}
return $userid;
}
function nex_fetch_musername_option(&$parser, $title='', $userid)
{
global $vbulletin, $db;
# check if we have a username or userid
$wesearch = is_numeric($userid) ? 'userid' : 'username';
if($user = $db->query_first_slave("
SELECT * FROM " . TABLE_PREFIX . "user
WHERE " . $wesearch . " = '" . $userid . "'
"))
{
if($title != '') $user['username'] = $title;
$musername = fetch_musername($user);
return '<a href="' . $vbulletin->options['bburl'] . '/member.php?u=' . $user['userid'] . '">' . $musername . '</a>';
}
return $userid;
}
}
// [USER]
$this->tag_list['no_option']['user'] = array(
'callback' => 'handle_external',
'strip_empty' => true,
'stop_parse' => false,
'disable_smilies' => false,
'disable_wordwrap' => true,
'strip_space_after' => 0,
'external_callback' => 'nex_fetch_musername'
);
// [USER=XXX]
$this->tag_list['option']['user'] = array(
'callback' => 'handle_external',
'strip_empty' => true,
'stop_parse' => false,
'disable_smilies' => false,
'disable_wordwrap' => true,
'strip_space_after' => 0,
'external_callback' => 'nex_fetch_musername_option'
);
Note: This isn't my code - it works on vBulletin 3.8.3 however.
An XML is also attached if you don't want to do it manually.