MergeLogFormatter.php

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<?php
class MergeLogFormatter extends LogFormatter {
    public function getPreloadTitles() {
        $params = $this->extractParameters();
 
        return [ Title::newFromText( $params[3] ) ];
    }
 
    protected function getMessageParameters() {
        $params = parent::getMessageParameters();
        $oldname = $this->makePageLink( $this->entry->getTarget(), [ 'redirect' => 'no' ] );
        $newname = $this->makePageLink( Title::newFromText( $params[3] ) );
        $params[2] = Message::rawParam( $oldname );
        $params[3] = Message::rawParam( $newname );
        $params[4] = $this->context->getLanguage()
            ->userTimeAndDate( $params[4], $this->context->getUser() );
        return $params;
    }
 
    public function getActionLinks() {
        if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) // Action is hidden
            || !$this->context->getUser()->isAllowed( 'mergehistory' )
        ) {
            return '';
        }
 
        // Show unmerge link
        $params = $this->extractParameters();
        $revert = Linker::linkKnown(
            SpecialPage::getTitleFor( 'MergeHistory' ),
            $this->msg( 'revertmerge' )->escaped(),
            [],
            [
                'target' => $params[3],
                'dest' => $this->entry->getTarget()->getPrefixedDBkey(),
                'mergepoint' => $params[4],
                'submitted' => 1 // show the revisions immediately
            ]
        );
 
        return $this->msg( 'parentheses' )->rawParams( $revert )->escaped();
    }
 
    protected function getParametersForApi() {
        $entry = $this->entry;
        $params = $entry->getParameters();
 
        static $map = [
            '4:title:dest',
            '5:timestamp:mergepoint',
            '4::dest' => '4:title:dest',
            '5::mergepoint' => '5:timestamp:mergepoint',
        ];
        foreach ( $map as $index => $key ) {
            if ( isset( $params[$index] ) ) {
                $params[$key] = $params[$index];
                unset( $params[$index] );
            }
        }
 
        return $params;
    }
}