Hi, 

in my first attempt at jumping into improving a mediawiki extension, I am 
failing at a very basic step. 

I want to make the extension configurable and followed this advice: 
[ https://www.mediawiki.org/wiki/Manual:Configuration_for_developers | 
https://www.mediawiki.org/wiki/Manual:Configuration_for_developers ] 


this is my extension.json I added: 

"config": { 
"ShariffServices": { 
"value": "["twitter","facebook","pinterest"]", 
"description": "configuration of available services" 
} 
}, 
"ConfigRegistry": { 
"Shariff": "GlobalVarConfig::newInstance" 
}, 

now in the baisc PHP file of the extension, I am trying 
use MediaWiki\MediaWikiServices; 
$config = MediaWikiServices::getInstance()->getConfigFactory()->makeConfig( 
'Shariff' ); 
$services = $config->get ('Services'); 

but the last line leads to 
[XtqcaewKU0Q3UCukKmZO9AAAABM] /index.php?title=Main_Page Error from line 3061 
of ../includes/parser/Parser.php: Call to a member function 
matchStartAndRemove() on null 

Backtrace: 

#0 ..includes/parser/Preprocessor_DOM.php(1277): 
Parser->braceSubstitution(array, PPFrame_DOM) 
#1 ../includes/parser/Parser.php(2942): PPFrame_DOM->expand(DOMElement, 
integer) 
#2 ../includes/parser/Parser.php(701): Parser->replaceVariables(string, 
PPFrame_DOM) 
#3 ../includes/parser/Parser.php(4717): Parser->preprocess(string, Title, 
ParserOptions) 
#4 ../includes/cache/MessageCache.php(1089): Parser->transformMsg(string, 
ParserOptions, Title) 
#5 ../includes/Message.php(1273): MessageCache->transform(string, boolean, 
LanguageEn, Title) 
#6 ../includes/Message.php(874): Message->transformText(string) 
#7 ../includes/Message.php(934): Message->toString(string) 
#8 ../includes/OutputPage.php(902): Message->text() 
#9 /../includes/OutputPage.php(949): OutputPage->setHTMLTitle(Message) 
#10 ../includes/OutputPage.php(2424): OutputPage->setPageTitle(string) 
#11 /../includes/exception/MWExceptionRenderer.php(128): 
OutputPage->prepareErrorPage(string) 
#12 ../includes/exception/MWExceptionRenderer.php(54): 
MWExceptionRenderer::reportHTML(ConfigException) 
#13 ../includes/exception/MWExceptionHandler.php(75): 
MWExceptionRenderer::output(ConfigException, integer) 
#14 ../includes/exception/MWExceptionHandler.php(149): 
MWExceptionHandler::report(ConfigException) 
#15 ../includes/MediaWiki.php(551): 
MWExceptionHandler::handleException(ConfigException) 
#16 ../index.php(42): MediaWiki->run() 
#17 {main} 



What am I doing wrong? 


As far is I understand it, using DefaultSettings.php is outdated, we should be 
using extension.json. But I can't get it to work. 


Can anybody point me to a simple extension that uses this mechanism correctly?, 





cheers, 


Bernhard 


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