InputBoxHooks.php

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<?php
class InputBoxHooks {
 
    public static function register( Parser &$parser ) {
        // Register the hook with the parser
        $parser->setHook( 'inputbox', [ 'InputBoxHooks', 'render' ] );
 
        // Continue
        return true;
    }
 
    public static function onSpecialPageBeforeExecute( $special, $subPage ) {
        $request = $special->getRequest();
        $prefix = $request->getText( 'prefix', '' );
        $title = $request->getText( 'wpNewTitle', '' );
        $search = $request->getText( 'search', '' );
        $searchfilter = $request->getText( 'searchfilter', '' );
        if ( $special->getName() == 'Movepage' && $prefix !== '' && $title !== '' ) {
            $request->setVal( 'wpNewTitle', $prefix . $title );
            $request->unsetVal( 'prefix' );
        }
        if ( $special->getName() == 'Search' && $searchfilter !== '' ) {
            $request->setVal( 'search', $search . ' ' . $searchfilter );
        }
        return true;
    }
 
    public static function render( $input, $args, Parser $parser ) {
        // Create InputBox
        $inputBox = new InputBox( $parser );
 
        // Configure InputBox
        $inputBox->extractOptions( $parser->replaceVariables( $input ) );
 
        // Return output
        return $inputBox->render();
    }
 
    public static function onMediaWikiPerformAction(
        $output,
        $article,
        $title,
        $user,
        $request,
        $wiki
    ) {
        if ( $wiki->getAction() !== 'edit' && $request->getText( 'veaction' ) !== 'edit' ) {
            // not our problem
            return true;
        }
        if ( $request->getText( 'prefix', '' ) === '' ) {
            // Fine
            return true;
        }
 
        $params = $request->getValues();
        $title = $params['prefix'];
        if ( isset( $params['title'] ) ) {
            $title .= $params['title'];
        }
        unset( $params['prefix'] );
        $params['title'] = $title;
 
        global $wgScript;
        $output->redirect( wfAppendQuery( $wgScript, $params ), '301' );
        return false;
    }
}