Extension:ConditionalShow

<?php
/*
 * ConditionalShowSection MediaWiki extension
 *
 * @author Jean-Lou Dupont
 * @package MediaWiki
 * @subpackage Extensions
 * @licence GNU General Public Licence 2.0
 * This extension enables to conditionally show/hide a section
 * of wikitext that appears between the <cshow> </cshow> tags.
 *
 * Add to LocalSettings.php
 * with: require_once("extensions/ConditionalShowSection.php");
 *
 * HISTORY:
 * 1.1: corrected bug when "ingroup" option not present, wrong results.
 * 1.2: used "recursiveTagParse" to get cleaner parsing.
 * 1.3: corrected error with default initialisation of userReqLogged
 * 1.4: changed to using 'getEffectiveGroups' in order to have also access
 *      to the implicit '*' group and the default group for logged users 'user'.
 */
$wgExtensionCredits['other'][] = array(
        'name'   => "ConditionalShowSection [http://www.bluecortex.com]",
        'url'    => 'http://www.mediawiki.org/wiki/Extension:ConditionalShow',
        'version'=> '1.4',
        'author' => 'Jean-Lou Dupont [http://www.bluecortex.com]' 
);
 
$wgExtensionFunctions[] = "wfConditionalShowSection";
 
function wfConditionalShowSection() {
    global $wgParser;
    $wgParser->setHook( "cshow", "ConditionalShowSection" );
}
 
function ConditionalShowSection( $input, $argv, &$parser ) {
    #
    # By default, the section is HIDDEN unless the following conditions are met:
    # Argument: Logged = '1' or '0'  
    # Argument: InGroup = 'group XYZ'
    #
    # If no arguments are provided for:
    # - Logged   --> assume 'don't care' 
    # - InGroup  --> assume ''           (no group)
        #
        # In other words, if no 'ingroup' parameter is given,
        # then the condition 'ingroup' is never met.
    #
        # If no "logged" parameter is given, then this condition is always met.
    # 
    # Examples: <cshow Logged="1" InGroup="sysop"> text to show upon conditions met </cshow>
    # if the user viewing the page is LOGGED and part of the SYSOP group then show the section.
        #
        # <cshow ingroup='user'> Test </cshow>
        # shows 'Test' if the user viewing the page is logged and by default part of the 'user' group. 
    #
        global $wgUser;
 
        $userReqLogged = null;         # default is "don't care"
        $userReqGroup  = "" ;    # assuming no group membership required
        $output = "";                # assuming the section is hidden by default.
 
        $cond1 = false;                        
        $cond2 = false;                        # by default, don't show the section to just anybody
 
        # Extract the parameters passed
        # the parser lowers the case of all the parameters passed...
        if (isset($argv["logged"]))
        {
                $userReqLogged = $argv["logged"];
 
                if ($userReqLogged==="1" && ($wgUser->isLoggedIn()===true)) 
                        $cond1=true;
 
                if ($userReqLogged==="0" && ($wgUser->isLoggedIn()===false))
                        $cond1=true;
        }
        if (isset($argv["ingroup"]))
        {
                $userReqGroup  = $argv["ingroup"];
                # which groups is the user part of?
                $ugroups = $wgUser->getEffectiveGroups();  // changed in v1.4
                $result  = array_search($userReqGroup,$ugroups);
 
                if ($result!==false)
                        $cond2=true;
        }
        # if both conditions are met, then SHOW else HIDE
        if (($cond1===true) and ($cond2===true))
         $output=$parser->recursiveTagParse($input);
 
        return $output;
}