TimelessVariablesModule.php

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<?php
class TimelessVariablesModule extends ResourceLoaderSkinModule {
    protected function getLessVars( ResourceLoaderContext $context ) {
        $vars = parent::getLessVars( $context );
        $config = $this->getConfig();
 
        // Backdrop image
        $backdrop = $config->get( 'TimelessBackdropImage' );
 
        if ( $backdrop === 'cat.svg' ) {
            // expand default
            $backdrop = 'images/cat.svg';
        }
 
        $vars = array_merge(
            $vars,
            [
                'backdrop-image' => "url($backdrop)",
                // 'logo-image' => ''
                // 'wordmark-image' => ''
                // +width cutoffs ...
            ]
        );
 
        return $vars;
    }
 
    public function getDefinitionSummary( ResourceLoaderContext $context ) {
        $summary = parent::getDefinitionSummary( $context );
        $summary[] = [
            'TimelessBackdropImage' => $this->getConfig()->get( 'TimelessBackdropImage' )
        ];
        return $summary;
    }
}