SpecialApiHelp.php

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<?php
class SpecialApiHelp extends UnlistedSpecialPage {
    public function __construct() {
        parent::__construct( 'ApiHelp' );
    }

    public function execute( $par ) {
        if ( empty( $par ) ) {
            $par = 'main';
        }

        // These come from transclusions
        $request = $this->getRequest();
        $options = [
            'action' => 'help',
            'nolead' => true,
            'submodules' => $request->getCheck( 'submodules' ),
            'recursivesubmodules' => $request->getCheck( 'recursivesubmodules' ),
            'title' => $request->getVal( 'title', $this->getPageTitle( '$1' )->getPrefixedText() ),
        ];

        // These are for linking from wikitext, since url parameters are a pain
        // to do.
        while ( true ) {
            if ( substr( $par, 0, 4 ) === 'sub/' ) {
                $par = substr( $par, 4 );
                $options['submodules'] = 1;
                continue;
            }

            if ( substr( $par, 0, 5 ) === 'rsub/' ) {
                $par = substr( $par, 5 );
                $options['recursivesubmodules'] = 1;
                continue;
            }

            $moduleName = $par;
            break;
        }

        if ( !$this->including() ) {
            unset( $options['nolead'], $options['title'] );
            $options['modules'] = $moduleName;
            $link = wfAppendQuery( wfExpandUrl( wfScript( 'api' ), PROTO_CURRENT ), $options );
            $this->getOutput()->redirect( $link );
            return;
        }

        $main = new ApiMain( $this->getContext(), false );
        try {
            $module = $main->getModuleFromPath( $moduleName );
        } catch ( UsageException $ex ) {
            $this->getOutput()->addHTML( Html::rawElement( 'span', [ 'class' => 'error' ],
                $this->msg( 'apihelp-no-such-module', $moduleName )->inContentLanguage()->parse()
            ) );
            return;
        }

        ApiHelp::getHelp( $this->getContext(), $module, $options );
    }

    public function isIncludable() {
        return true;
    }
}