checkLess.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class CheckLess extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->mDescription = 'Checks LESS files for errors';
    }

    public function execute() {
        $result = false;
        $resourceLoader = new ResourceLoader();
        foreach ( $resourceLoader->getModuleNames() as $name ) {
            $module = $resourceLoader->getModule( $name );
            if ( !$module || !$module instanceof ResourceLoaderFileModule ) {
                continue;
            }

            $hadErrors = false;
            foreach ( $module->getAllStyleFiles() as $file ) {
                if ( $module->getStyleSheetLang( $file ) !== 'less' ) {
                    continue;
                }
                try {
                    $compiler = ResourceLoader::getLessCompiler();
                    $compiler->compileFile( $file );
                } catch ( Exception $e ) {
                    if ( !$hadErrors ) {
                        $this->error( "Errors checking module $name:\n" );
                        $hadErrors = true;
                    }
                    $this->error( $e->getMessage() . "\n" );
                    $result = true;
                }
            }
        }
        if ( !$result ) {
            $this->output( "No errors found\n" );
        } else {
            die( 1 );
        }
    }
}

$maintClass = 'CheckLess';
require_once RUN_MAINTENANCE_IF_MAIN;