WebInstallerDocument.php

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<?php
abstract class WebInstallerDocument extends WebInstallerPage {
 
    abstract protected function getFileName();
 
    public function execute() {
        $text = $this->getFileContents();
        $text = InstallDocFormatter::format( $text );
        $this->parent->output->addWikiTextAsInterface( $text );
        $this->startForm();
        $this->endForm( false );
        return '';
    }
 
    public function getFileContents() {
        $file = __DIR__ . '/../../' . $this->getFileName();
        if ( !file_exists( $file ) ) {
            return wfMessage( 'config-nofile', $file )->plain();
        }
 
        return file_get_contents( $file );
    }
 
}