Ticket #15182: 15182.2.patch

new file src/org/openstreetmap/josm/data/validation/ValidatorCLI.java

@@ +1 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+import static org.openstreetmap.josm.tools.I18n.trn;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Supplier;
+import java.util.logging.Level;
+import java.util.stream.Collectors;
+
+import org.apache.commons.compress.utils.FileNameUtils;
+import org.openstreetmap.josm.actions.ExtensionFileFilter;
+import org.openstreetmap.josm.cli.CLIModule;
+import org.openstreetmap.josm.data.Preferences;
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.data.preferences.JosmBaseDirectories;
+import org.openstreetmap.josm.data.preferences.JosmUrls;
+import org.openstreetmap.josm.data.projection.ProjectionRegistry;
+import org.openstreetmap.josm.data.projection.Projections;
+import org.openstreetmap.josm.data.validation.tests.MapCSSTagChecker;
+import org.openstreetmap.josm.gui.MainApplication;
+import org.openstreetmap.josm.gui.io.CustomConfigurator;
+import org.openstreetmap.josm.gui.io.importexport.FileImporter;
+import org.openstreetmap.josm.gui.layer.OsmDataLayer;
+import org.openstreetmap.josm.gui.mappaint.mapcss.MapCSSStyleSource;
+import org.openstreetmap.josm.gui.mappaint.mapcss.parsergen.ParseException;
+import org.openstreetmap.josm.gui.progress.CLIProgressMonitor;
+import org.openstreetmap.josm.gui.progress.ProgressMonitor;
+import org.openstreetmap.josm.io.Compression;
+import org.openstreetmap.josm.io.GeoJSONMapRouletteWriter;
+import org.openstreetmap.josm.io.IllegalDataException;
+import org.openstreetmap.josm.io.OsmChangeReader;
+import org.openstreetmap.josm.spi.lifecycle.Lifecycle;
+import org.openstreetmap.josm.spi.preferences.Config;
+import org.openstreetmap.josm.spi.preferences.IPreferences;
+import org.openstreetmap.josm.spi.preferences.MemoryPreferences;
+import org.openstreetmap.josm.tools.Http1Client;
+import org.openstreetmap.josm.tools.HttpClient;
+import org.openstreetmap.josm.tools.I18n;
+import org.openstreetmap.josm.tools.JosmRuntimeException;
+import org.openstreetmap.josm.tools.Logging;
+import org.openstreetmap.josm.tools.OptionParser;
+import org.openstreetmap.josm.tools.Stopwatch;
+import org.openstreetmap.josm.tools.Territories;
+import org.openstreetmap.josm.tools.Utils;
+
+/**
+ * Add a validate command to the JOSM command line interface.
+ * @author Taylor Smock
+ * @since xxx
+ */
+public class ValidatorCLI implements CLIModule {
+    public static final ValidatorCLI INSTANCE = new ValidatorCLI();
+
+    /** The input file(s) */
+    private final List<String> input = new ArrayList<>();
+    /** The change files. input file -> list of change files */
+    private final Map<String, List<String>> changeFiles = new HashMap<>();
+    /** The output file(s). If {@code null}, use input filename as base (replace extension with geojson). input -> output */
+    private final Map<String, String> output = new HashMap<>();
+
+    private static final Supplier<ProgressMonitor> progressMonitorFactory = CLIProgressMonitor::new;
+
+    /** The log level */
+    private Level logLevel;
+
+    private enum Option {
+        /** --help                                    Show the help for validate */
+        HELP(false, 'h'),
+        /** --input=&lt;input-file&gt;                Set the current input file */
+        INPUT(true, 'i', OptionParser.OptionCount.MULTIPLE),
+        /** --output=&lt;output-file&gt;              Set the output file for the current input file */
+        OUTPUT(true, 'o', OptionParser.OptionCount.MULTIPLE),
+        /** --change-file=&lt;change-file&gt;         Add a change file */
+        CHANGE_FILE(true, 'c', OptionParser.OptionCount.MULTIPLE),
+        /** --debug                                   Set logging level to debug */
+        DEBUG(false, '*'),
+        /** --trace                                   Set logging level to trace */
+        TRACE(false, '*'),
+        /** --language=&lt;language&gt;                Set the language */
+        LANGUAGE(true, 'l'),
+        /** --load-preferences=&lt;url-to-xml&gt;      Changes preferences according to the XML file */
+        LOAD_PREFERENCES(true, 'p'),
+        /** --set=&lt;key&gt;=&lt;value&gt;            Set preference key to value */
+        SET(true, 's');
+
+        private final String name;
+        private final boolean requiresArgument;
+        private final char shortOption;
+        private final OptionParser.OptionCount optionCount;
+        Option(final boolean requiresArgument, final char shortOption) {
+            this(requiresArgument, shortOption, OptionParser.OptionCount.OPTIONAL);
+        }
+
+        Option(final boolean requiresArgument, final char shortOption, final OptionParser.OptionCount optionCount) {
+            this.name = name().toLowerCase(Locale.ROOT).replace('_', '-');
+            this.requiresArgument = requiresArgument;
+            this.shortOption = shortOption;
+            this.optionCount = optionCount;
+        }
+
+        /**
+         * Replies the option name
+         * @return The option name, in lowercase
+         */
+        public String getName() {
+            return this.name;
+        }
+
+        /**
+         * Get the number of times this option should be seen
+         * @return The option count
+         */
+        public OptionParser.OptionCount getOptionCount() {
+            return this.optionCount;
+        }
+
+        /**
+         * Replies the short option (single letter) associated with this option.
+         * @return the short option or '*' if there is no short option
+         */
+        public char getShortOption() {
+            return this.shortOption;
+        }
+
+        /**
+         * Determines if this option requires an argument.
+         * @return {@code true} if this option requires an argument, {@code false} otherwise
+         */
+        public boolean requiresArgument() {
+            return this.requiresArgument;
+        }
+
+    }
+
+    @Override
+    public String getActionKeyword() {
+        return "validate";
+    }
+
+    @Override
+    public void processArguments(final String[] argArray) {
+        try {
+            // Ensure that preferences are only in memory
+            Config.setPreferencesInstance(new MemoryPreferences());
+            Logging.setLogLevel(Level.INFO);
+            this.parseArguments(argArray);
+            if (this.input.isEmpty()) {
+                throw new IllegalArgumentException(tr("Missing argument - input data file ({0})", "--input|-i"));
+            }
+            this.initialize();
+            final ProgressMonitor fileMonitor = progressMonitorFactory.get();
+            fileMonitor.beginTask(tr("Processing files..."), this.input.size());
+            for (String inputFile : this.input) {
+                if (inputFile.endsWith(".validator.mapcss")) {
+                    this.processValidatorFile(inputFile);
+                } else if (inputFile.endsWith(".mapcss")) {
+                    this.processMapcssFile(inputFile);
+                } else {
+                    this.processFile(inputFile);
+                }
+                fileMonitor.worked(1);
+            }
+            fileMonitor.finishTask();
+        } catch (Exception e) {
+            Logging.info(e);
+            Lifecycle.exitJosm(true, 1);
+        }
+        Lifecycle.exitJosm(true, 0);
+    }
+
+    /**
+     * Process a standard mapcss file
+     * @param inputFile The mapcss file to validate
+     * @throws ParseException if the file does not match the mapcss syntax
+     */
+    private void processMapcssFile(final String inputFile) throws ParseException {
+        final MapCSSStyleSource styleSource = new MapCSSStyleSource(new File(inputFile).toURI().getPath(), inputFile, inputFile);
+        styleSource.loadStyleSource();
+        if (!styleSource.getErrors().isEmpty()) {
+            throw new ParseException(trn("{0} had {1} error", "{0} had {1} errors", styleSource.getErrors().size(),
+                    inputFile, styleSource.getErrors().size()));
+        } else {
+            Logging.info(tr("{0} had no errors", inputFile));
+        }
+    }
+
+    /**
+     * Process a validator file
+     * @param inputFile The file to check
+     * @throws IOException if there is a problem reading the file
+     * @throws ParseException if the file does not match the validator mapcss syntax
+     */
+    private void processValidatorFile(final String inputFile) throws ParseException, IOException {
+        // Check asserts
+        Config.getPref().putBoolean("validator.check_assert_local_rules", true);
+        final MapCSSTagChecker mapCSSTagChecker = new MapCSSTagChecker();
+        final Collection<String> assertionErrors = new ArrayList<>();
+        final MapCSSTagChecker.ParseResult result = mapCSSTagChecker.addMapCSS(new File(inputFile).toURI().getPath(),
+                assertionErrors::add);
+        if (!result.parseErrors.isEmpty() || !assertionErrors.isEmpty()) {
+            for (Throwable throwable : result.parseErrors) {
+                Logging.error(throwable);
+            }
+            for (String error : assertionErrors) {
+                Logging.error(error);
+            }
+            throw new ParseException(trn("{0} had {1} error", "{0} had {1} errors", result.parseErrors.size() + assertionErrors.size(),
+                    inputFile, result.parseErrors.size() + assertionErrors.size()));
+        } else {
+            Logging.info(tr("{0} had no errors"), inputFile);
+        }
+    }
+
+    /**
+     * Process an OSM file
+     * @param inputFile The input filename
+     * @throws IllegalArgumentException If an argument is not valid
+     * @throws IllegalDataException If there is bad data
+     * @throws IOException If a file could not be read or written
+     */
+    private void processFile(final String inputFile) throws IllegalDataException, IOException {
+        final File inputFileFile = new File(inputFile);
+        final List<FileImporter> inputFileImporters = ExtensionFileFilter.getImporters().stream()
+                .filter(importer -> importer.acceptFile(inputFileFile)).collect(Collectors.toList());
+        final Stopwatch stopwatch = Stopwatch.createStarted();
+        if (inputFileImporters.stream().noneMatch(fileImporter ->
+                fileImporter.importDataHandleExceptions(inputFileFile, progressMonitorFactory.get()))) {
+            throw new IOException(tr("Could not load input file: {0}", inputFile));
+        }
+        final String outputFile = Optional.ofNullable(this.output.get(inputFile)).orElseGet(() -> getDefaultOutputName(inputFile));
+        final String task = tr("Validating {0}, saving output to {1}", inputFile, outputFile);
+        OsmDataLayer dataLayer = null;
+        try {
+            Logging.info(task);
+            OsmValidator.initializeTests();
+            dataLayer = MainApplication.getLayerManager().getLayersOfType(OsmDataLayer.class)
+                    .stream().filter(layer -> inputFileFile.equals(layer.getAssociatedFile()))
+                    .findFirst().orElseThrow(() -> new JosmRuntimeException(tr("Could not find a layer for {0}", inputFile)));
+            final DataSet dataSet = dataLayer.getDataSet();
+            if (this.changeFiles.containsKey(inputFile)) {
+                ProgressMonitor changeFilesMonitor = progressMonitorFactory.get();
+                changeFilesMonitor.beginTask(tr("Reading change files"), this.changeFiles.size());
+                for (String changeFile : this.changeFiles.getOrDefault(inputFile, Collections.emptyList())) {
+                    try (InputStream changeStream = Compression.getUncompressedFileInputStream(Paths.get(changeFile))) {
+                        dataSet.mergeFrom(OsmChangeReader.parseDataSet(changeStream, changeFilesMonitor));
+                    }
+                }
+                changeFilesMonitor.finishTask();
+            }
+            Collection<Test> tests = OsmValidator.getEnabledTests(false);
+            if (Files.isRegularFile(Paths.get(outputFile)) && !Files.deleteIfExists(Paths.get(outputFile))) {
+                Logging.error("Could not delete {0}, attempting to append", outputFile);
+            }
+            GeoJSONMapRouletteWriter geoJSONMapRouletteWriter = new GeoJSONMapRouletteWriter(dataSet);
+            try (OutputStream fileOutputStream = Files.newOutputStream(Paths.get(outputFile))) {
+                tests.parallelStream().forEach(test -> runTest(test, geoJSONMapRouletteWriter, fileOutputStream, dataSet));
+            }
+        } finally {
+            if (dataLayer != null) {
+                MainApplication.getLayerManager().removeLayer(dataLayer);
+            }
+            Logging.info(stopwatch.toString(task));
+        }
+    }
+
+    /**
+     * Get the default output name
+     * @param inputString The input file
+     * @return The default output name for the input file (extension stripped, ".geojson" added)
+     */
+    private static String getDefaultOutputName(final String inputString) {
+        final String extension = FileNameUtils.getExtension(inputString);
+        if (!Arrays.asList("zip", "bz", "xz", "geojson").contains(extension)) {
+            return FileNameUtils.getBaseName(inputString) + ".geojson";
+        } else if ("geojson".equals(extension)) {
+            // Account for geojson input files
+            return FileNameUtils.getBaseName(inputString) + ".validated.geojson";
+        }
+        return FileNameUtils.getBaseName(FileNameUtils.getBaseName(inputString)) + ".geojson";
+    }
+
+    /**
+     * Run a test
+     * @param test The test to run
+     * @param geoJSONMapRouletteWriter The object to use to create challenges
+     * @param fileOutputStream The location to write data to
+     * @param dataSet The dataset to check
+     */
+    private void runTest(final Test test, final GeoJSONMapRouletteWriter geoJSONMapRouletteWriter,
+            final OutputStream fileOutputStream, DataSet dataSet) {
+        test.startTest(progressMonitorFactory.get());
+        test.visit(dataSet.allPrimitives());
+        test.endTest();
+        test.getErrors().stream().map(geoJSONMapRouletteWriter::write)
+                .filter(Optional::isPresent).map(Optional::get)
+                .map(jsonObject -> jsonObject.toString().getBytes(StandardCharsets.UTF_8)).forEach(bytes -> {
+                    try {
+                        writeToFile(fileOutputStream, bytes);
+                    } catch (IOException e) {
+                        throw new JosmRuntimeException(e);
+                    }
+                });
+        test.clear();
+    }
+
+    /**
+     * Write to a file. Synchronized to avoid writing to the same file in different threads.
+     *
+     * @param fileOutputStream The file output stream to read
+     * @param bytes The bytes to write (surrounded by RS and LF)
+     * @throws IOException If we couldn't write to file
+     */
+    private synchronized void writeToFile(final OutputStream fileOutputStream, final byte[] bytes)
+            throws IOException {
+        // Write the ASCII Record Separator character
+        fileOutputStream.write(0x1e);
+        fileOutputStream.write(bytes);
+        // Write the ASCII Line Feed character
+        fileOutputStream.write(0x0a);
+    }
+
+    /**
+     * Initialize everything that might be needed
+     *
+     * Arguments may need to be parsed first.
+     */
+    void initialize() {
+        Logging.setLogLevel(this.logLevel);
+        HttpClient.setFactory(Http1Client::new);
+        Config.setBaseDirectoriesProvider(JosmBaseDirectories.getInstance()); // for right-left-hand traffic cache file
+        Config.setUrlsProvider(JosmUrls.getInstance());
+        ProjectionRegistry.setProjection(Projections.getProjectionByCode("epsg:3857".toUpperCase(Locale.ROOT)));
+
+        Territories.initializeInternalData();
+        OsmValidator.initialize();
+    }
+
+    /**
+     * Parse command line arguments and do some low-level error checking.
+     * @param argArray the arguments array
+     */
+    void parseArguments(String[] argArray) {
+        Logging.setLogLevel(Level.INFO);
+
+        OptionParser parser = new OptionParser("JOSM validate");
+        final AtomicReference<String> currentInput = new AtomicReference<>(null);
+        for (Option o : Option.values()) {
+            if (o.requiresArgument()) {
+                parser.addArgumentParameter(o.getName(),
+                        o.getOptionCount(),
+                        arg -> handleOption(currentInput.get(), o, arg).ifPresent(currentInput::set));
+            } else {
+                parser.addFlagParameter(o.getName(), () -> handleOption(o));
+            }
+            if (o.getShortOption() != '*') {
+                parser.addShortAlias(o.getName(), Character.toString(o.getShortOption()));
+            }
+        }
+        parser.parseOptionsOrExit(Arrays.asList(argArray));
+    }
+
+    private void handleOption(final Option option) {
+        switch (option) {
+        case HELP:
+            showHelp();
+            System.exit(0);
+            break;
+        case DEBUG:
+            this.logLevel = Logging.LEVEL_DEBUG;
+            break;
+        case TRACE:
+            this.logLevel = Logging.LEVEL_TRACE;
+            break;
+        default:
+            throw new AssertionError("Unexpected option: " + option);
+        }
+    }
+
+    /**
+     * Handle an option
+     * @param currentInput The current input file, if any. May be {@code null}.
+     * @param option The option to parse
+     * @param argument The argument for the option
+     * @return The new input file, if any.
+     */
+    private Optional<String> handleOption(final String currentInput, final Option option, final String argument) {
+        switch (option) {
+        case INPUT:
+            this.input.add(argument);
+            return Optional.of(argument);
+        case OUTPUT:
+            this.output.put(currentInput, argument);
+            break;
+        case CHANGE_FILE:
+            this.changeFiles.computeIfAbsent(currentInput, key -> new ArrayList<>()).add(argument);
+            break;
+        case LANGUAGE:
+            I18n.set(argument);
+            break;
+        case LOAD_PREFERENCES:
+            final Preferences tempPreferences = new Preferences();
+            tempPreferences.enableSaveOnPut(false);
+            CustomConfigurator.XMLCommandProcessor config = new CustomConfigurator.XMLCommandProcessor(tempPreferences);
+            try (InputStream is = Utils.openStream(new File(argument).toURI().toURL())) {
+                config.openAndReadXML(is);
+            } catch (IOException e) {
+                throw new JosmRuntimeException(e);
+            }
+            final IPreferences pref = Config.getPref();
+            if (pref instanceof MemoryPreferences) {
+                final MemoryPreferences memoryPreferences = (MemoryPreferences) pref;
+                tempPreferences.getAllSettings().entrySet().stream().filter(entry -> entry.getValue().isNew())
+                        .forEach(entry -> memoryPreferences.putSetting(entry.getKey(), entry.getValue()));
+            } else {
+                throw new JosmRuntimeException(tr("Preferences are not the expected type"));
+            }
+            break;
+        case SET:
+
+        default:
+            throw new AssertionError("Unexpected option: " + option);
+        }
+        return Optional.empty();
+    }
+
+    private static void showHelp() {
+        System.out.println(getHelp());
+    }
+
+    private static String getHelp() {
+        final String helpPadding = "\t                          ";
+        // CHECKSTYLE.OFF: SingleSpaceSeparator
+        return tr("JOSM Validation command line interface") + "\n\n" +
+                tr("Usage") + ":\n" +
+                "\tjava -jar josm.jar validate <options>\n\n" +
+                tr("Description") + ":\n" +
+                tr("Validates data and saves the result to a file.") + "\n\n"+
+                tr("Options") + ":\n" +
+                "\t--help|-h                 " + tr("Show this help") + "\n" +
+                "\t--input|-i <file>         " + tr("Input data file name (.osm, .validator.mapcss, .mapcss).") + '\n' +
+                helpPadding                    + tr("OSM files can be specified multiple times. Required.") + '\n' +
+                helpPadding                    + tr(".validator.mapcss and .mapcss files will stop processing on first error.") + '\n' +
+                helpPadding                    + tr("Non-osm files do not use --output or --change-file") + '\n' +
+                "\t--output|-o <file>        " + tr("Output data file name (.geojson, line-by-line delimited for MapRoulette). Optional.")
+                                               + '\n' +
+                "\t--change-file|-c <file>   " + tr("Change file name (.osc). Can be specified multiple times per input.") + '\n' +
+                helpPadding                    + tr("Changes will be applied in the specified order. Optional.");
+        // CHECKSTYLE.ON: SingleSpaceSeparator
+    }
+}

src/org/openstreetmap/josm/data/validation/tests/MapCSSTagChecker.java

@@ -253 +253 @@
         }
     }
 
-    /**
-     * A handler for assertion error messages (for not fulfilled "assertMatch", "assertNoMatch").
-     */
-    @FunctionalInterface
-    interface AssertionConsumer extends Consumer<String> {
-    }
-
     /**
      * Adds a new MapCSS config file from the given URL.
      * @param url The unique URL of the MapCSS config file
@@ -274 +267 @@
         return addMapCSS(url, checkAssertions ? Logging::warn : null);
     }
 
-    synchronized ParseResult addMapCSS(String url, AssertionConsumer assertionConsumer) throws ParseException, IOException {
+    /**
+     * Adds a new MapCSS config file from the given URL. <br />
+     * NOTE: You should prefer {@link #addMapCSS(String)} unless you <i>need</i> to know what the assertions return.
+     *
+     * @param url The unique URL of the MapCSS config file
+     * @param assertionConsumer A string consumer for error messages.
+     * @return List of tag checks and parsing errors, or null
+     * @throws ParseException if the config file does not match MapCSS syntax
+     * @throws IOException if any I/O error occurs
+     * @since xxx (public, primarily for ValidatorCLI)
+     */
+    public synchronized ParseResult addMapCSS(String url, Consumer<String> assertionConsumer) throws ParseException, IOException {
         CheckParameterUtil.ensureParameterNotNull(url, "url");
         ParseResult result;
         try (CachedFile cache = new CachedFile(url);

src/org/openstreetmap/josm/data/validation/tests/MapCSSTagCheckerAsserts.java

@@ -10 +10 @@
 import java.util.Map;
 import java.util.Optional;
 import java.util.Set;
+import java.util.function.Consumer;
 import java.util.stream.Collectors;
 
 import org.openstreetmap.josm.command.Command;
@@ -46 +47 @@
      * @param assertionConsumer The handler for assertion error messages
      */
     static void checkAsserts(final MapCSSTagCheckerRule check, final Map<String, Boolean> assertions,
-                             final MapCSSTagChecker.AssertionConsumer assertionConsumer) {
+                             final Consumer<String> assertionConsumer) {
         final DataSet ds = new DataSet();
         Logging.debug("Check: {0}", check);
         for (final Map.Entry<String, Boolean> i : assertions.entrySet()) {

src/org/openstreetmap/josm/data/validation/tests/MapCSSTagCheckerRule.java

@@ -15 +15 @@
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
+import java.util.function.Consumer;
 import java.util.function.Predicate;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -31 +32 @@
 import org.openstreetmap.josm.data.validation.Severity;
 import org.openstreetmap.josm.data.validation.Test;
 import org.openstreetmap.josm.data.validation.TestError;
-import org.openstreetmap.josm.data.validation.tests.MapCSSTagChecker.AssertionConsumer;
 import org.openstreetmap.josm.gui.mappaint.Environment;
 import org.openstreetmap.josm.gui.mappaint.Keyword;
 import org.openstreetmap.josm.gui.mappaint.mapcss.Condition;
@@ -106 +106 @@
 
     private static final String POSSIBLE_THROWS = "throwError/throwWarning/throwOther";
 
-    static MapCSSTagCheckerRule ofMapCSSRule(final MapCSSRule rule, AssertionConsumer assertionConsumer) throws IllegalDataException {
+    static MapCSSTagCheckerRule ofMapCSSRule(final MapCSSRule rule, Consumer<String> assertionConsumer) throws IllegalDataException {
         final MapCSSTagCheckerRule check = new MapCSSTagCheckerRule(rule);
         final Map<String, Boolean> assertions = new HashMap<>();
         for (Instruction i : rule.declaration.instructions) {
@@ -185 +185 @@
         return readMapCSS(css, null);
     }
 
-    static MapCSSTagChecker.ParseResult readMapCSS(Reader css, AssertionConsumer assertionConsumer) throws ParseException {
+    static MapCSSTagChecker.ParseResult readMapCSS(Reader css, Consumer<String> assertionConsumer) throws ParseException {
         CheckParameterUtil.ensureParameterNotNull(css, "css");
 
         final MapCSSStyleSource source = new MapCSSStyleSource("");

src/org/openstreetmap/josm/gui/MainApplication.java

@@ -98 +98 @@
 import org.openstreetmap.josm.data.projection.datum.NTV2GridShiftFileSource;
 import org.openstreetmap.josm.data.projection.datum.NTV2GridShiftFileWrapper;
 import org.openstreetmap.josm.data.projection.datum.NTV2Proj4DirGridShiftFileSource;
+import org.openstreetmap.josm.data.validation.ValidatorCLI;
 import org.openstreetmap.josm.data.validation.tests.MapCSSTagChecker;
 import org.openstreetmap.josm.gui.ProgramArguments.Option;
 import org.openstreetmap.josm.gui.SplashScreen.SplashProgressMonitor;
@@ -311 +312 @@
         registerCLIModule(JOSM_CLI_MODULE);
         registerCLIModule(ProjectionCLI.INSTANCE);
         registerCLIModule(RenderingCLI.INSTANCE);
+        registerCLIModule(ValidatorCLI.INSTANCE);
     }
 
     /**
@@ -660 +662 @@
                 tr("commands")+":\n"+
                 "\trunjosm     "+tr("launch JOSM (default, performed when no command is specified)")+'\n'+
                 "\trender      "+tr("render data and save the result to an image file")+'\n'+
-                "\tproject     "+tr("convert coordinates from one coordinate reference system to another")+"\n\n"+
+                "\tproject     " + tr("convert coordinates from one coordinate reference system to another")+ '\n' +
+                "\tvalidate    " + tr("validate data") + "\n\n" +
                 tr("For details on the {0} and {1} commands, run them with the {2} option.", "render", "project", "--help")+'\n'+
                 tr("The remainder of this help page documents the {0} command.", "runjosm")+"\n\n"+
                 tr("options")+":\n"+

src/org/openstreetmap/josm/gui/io/importexport/OsmImporter.java

@@ -97 +97 @@
         final OsmImporterData data = loadLayer(in, associatedFile,
                 associatedFile == null ? OsmDataLayer.createNewName() : associatedFile.getName(), pm);
 
+        final OsmDataLayer layer = data.getLayer();
+        // Note: addLayer calls GuiHelper.runInEDTAndWaitWithException
+        MainApplication.getLayerManager().addLayer(layer);
         // FIXME: remove UI stuff from IO subsystem
         GuiHelper.runInEDT(() -> {
-            OsmDataLayer layer = data.getLayer();
-            MainApplication.getLayerManager().addLayer(layer);
             data.getPostLayerTask().run();
             data.getLayer().onPostLoadFromFile();
         });

src/org/openstreetmap/josm/gui/preferences/projection/CustomProjectionChoice.java

@@ -23 +23 @@
 import org.openstreetmap.josm.data.projection.ProjectionConfigurationException;
 import org.openstreetmap.josm.data.projection.Projections;
 import org.openstreetmap.josm.gui.ExtendedDialog;
+import org.openstreetmap.josm.gui.tagging.ac.AutoCompTextField;
 import org.openstreetmap.josm.gui.widgets.AbstractTextComponentValidator;
 import org.openstreetmap.josm.gui.widgets.HistoryComboBox;
 import org.openstreetmap.josm.gui.widgets.HtmlPanel;
@@ -52 +53 @@
 
     private static class PreferencePanel extends JPanel {
 
-        public JosmTextField input;
+        public AutoCompTextField<String> input;
         private HistoryComboBox cbInput;
 
         PreferencePanel(String initialText, ActionListener listener) {
@@ -60 +61 @@
         }
 
         private void build(String initialText, final ActionListener listener) {
-            input = new JosmTextField(30);
+            input = new AutoCompTextField<>(30);
             cbInput = new HistoryComboBox();
             cbInput.setEditor(new BasicComboBoxEditor() {
                 @Override

src/org/openstreetmap/josm/gui/progress/AbstractProgressMonitor.java

@@ -233 +233 @@
      * Ticks handling
     ==================*/
 
+    /**
+     * Update progress message
+     * @param value The percentage of completion (this and child progress)
+     */
     protected abstract void updateProgress(double value);
 
     @Override

new file src/org/openstreetmap/josm/gui/progress/CLIProgressMonitor.java

@@ +1 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.progress;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+
+import java.awt.Component;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+
+import org.openstreetmap.josm.tools.Logging;
+import org.openstreetmap.josm.tools.Stopwatch;
+import org.openstreetmap.josm.tools.Utils;
+
+/**
+ * CLI implementation of a {@link ProgressMonitor}
+ * @author Taylor Smock
+ * @since xxx
+ */
+public class CLIProgressMonitor extends AbstractProgressMonitor {
+    /** The current task id */
+    private ProgressTaskId taskId;
+    /** The current task title */
+    private String title = "";
+    /** The custom text (prepended with '/') */
+    private String customText = "";
+    /** The last time we updated the progress information */
+    private Stopwatch lastUpdateTime;
+    /** The start time of the monitor */
+    private Stopwatch startTime;
+
+    /**
+     * Create a new {@link CLIProgressMonitor}
+     */
+    public CLIProgressMonitor() {
+        super(new CancelHandler());
+    }
+
+    @Override
+    protected void doBeginTask() {
+        if (!Utils.isBlank(this.title)) {
+            Logging.info(tr("Beginning task{2}: {0}{1}", this.title, this.customText,
+                    Optional.ofNullable(this.taskId).map(ProgressTaskId::getId).map(id -> ' ' + id).orElse("")));
+        }
+        this.startTime = Stopwatch.createStarted();
+        this.lastUpdateTime = this.startTime;
+    }
+
+    @Override
+    protected void doFinishTask() {
+        Logging.info(tr("Finishing task{2}: {0}{1} ({3})", this.title, this.customText,
+                Optional.ofNullable(this.taskId).map(ProgressTaskId::getId).map(id -> ' ' + id).orElse(""), this.startTime));
+        this.lastUpdateTime = null;
+    }
+
+    @Override
+    protected void doSetIntermediate(boolean value) {
+        // Do nothing for now
+    }
+
+    @Override
+    protected void doSetTitle(String title) {
+        this.title = Optional.ofNullable(title).orElse("");
+    }
+
+    @Override
+    protected void doSetCustomText(String customText) {
+        this.customText = Optional.ofNullable(customText).map(str -> '/' + str).orElse("");
+    }
+
+    @Override
+    protected void updateProgress(double value) {
+        if (this.lastUpdateTime == null || this.lastUpdateTime.elapsed() > TimeUnit.SECONDS.toMillis(10)) {
+            this.lastUpdateTime = Stopwatch.createStarted();
+            Logging.info(tr("Progress of task{2}: {0}{1} is {3}% ({4})", this.title, this.customText,
+                    Optional.ofNullable(this.taskId).map(ProgressTaskId::getId).map(id -> ' ' + id).orElse(""), value * 100, this.startTime));
+        }
+    }
+
+    @Override
+    public void setProgressTaskId(ProgressTaskId taskId) {
+        this.taskId = taskId;
+    }
+
+    @Override
+    public ProgressTaskId getProgressTaskId() {
+        return this.taskId;
+    }
+
+    @Override
+    public Component getWindowParent() {
+        return null;
+    }
+}

src/org/openstreetmap/josm/gui/util/GuiHelper.java

@@ -288 +288 @@
      * @since 10271
      */
     public static void assertCallFromEdt() {
-        if (!SwingUtilities.isEventDispatchThread()) {
+        if (!SwingUtilities.isEventDispatchThread() && !GraphicsEnvironment.isHeadless()) {
             throw new IllegalStateException(
                     "Needs to be called from the EDT thread, not from " + Thread.currentThread().getName());
         }

new file src/org/openstreetmap/josm/io/GeoJSONMapRouletteWriter.java

@@ +1 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.io;
+
+import java.util.Objects;
+import java.util.Optional;
+import java.util.stream.Stream;
+
+import javax.json.Json;
+import javax.json.JsonArray;
+import javax.json.JsonArrayBuilder;
+import javax.json.JsonObject;
+import javax.json.JsonObjectBuilder;
+import javax.json.JsonValue;
+
+import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.WaySegment;
+import org.openstreetmap.josm.data.validation.TestError;
+import org.openstreetmap.josm.tools.Logging;
+
+/**
+ * Convert {@link TestError} to MapRoulette Tasks
+ * @author Taylor Smock
+ * @since xxx
+ */
+public class GeoJSONMapRouletteWriter extends GeoJSONWriter {
+
+    /**
+     * Constructs a new {@code GeoJSONWriter}.
+     * @param ds The originating OSM dataset
+     */
+    public GeoJSONMapRouletteWriter(DataSet ds) {
+        super(ds);
+        super.setOptions(Options.RIGHT_HAND_RULE, Options.WRITE_OSM_INFORMATION);
+    }
+
+    /**
+     * Convert a test error to a string
+     * @param testError The test error to convert
+     * @return The MapRoulette challenge object
+     */
+    public Optional<JsonObject> write(final TestError testError) {
+        final JsonObjectBuilder jsonObjectBuilder = Json.createObjectBuilder();
+        final JsonArrayBuilder featuresBuilder = Json.createArrayBuilder();
+        final JsonObjectBuilder propertiesBuilder = Json.createObjectBuilder();
+        propertiesBuilder.add("message", testError.getMessage());
+        Optional.ofNullable(testError.getDescription()).ifPresent(description -> propertiesBuilder.add("description", description));
+        propertiesBuilder.add("code", testError.getCode());
+        propertiesBuilder.add("fixable", testError.isFixable());
+        propertiesBuilder.add("severity", testError.getSeverity().toString());
+        propertiesBuilder.add("severityInteger", testError.getSeverity().getLevel());
+        propertiesBuilder.add("test", testError.getTester().getName());
+        Stream.concat(testError.getPrimitives().stream(), testError.getHighlighted().stream()).distinct().map(p -> {
+            if (p instanceof OsmPrimitive) {
+                return p;
+            } else if (p instanceof WaySegment) {
+                return ((WaySegment) p).toWay();
+            }
+            Logging.trace("Could not convert {0} to an OsmPrimitive", p);
+            return null;
+        }).filter(Objects::nonNull).distinct().map(OsmPrimitive.class::cast)
+                .forEach(primitive -> super.appendPrimitive(primitive, featuresBuilder));
+        final JsonArray featureArray = featuresBuilder.build();
+        final JsonArrayBuilder featuresMessageBuilder = Json.createArrayBuilder();
+        if (featureArray.isEmpty()) {
+            Logging.trace("Could not generate task for {0}", testError.getMessage());
+            return Optional.empty();
+        }
+        JsonObject primitive = featureArray.getJsonObject(0);
+        JsonObjectBuilder replacementPrimitive = Json.createObjectBuilder(primitive);
+        final JsonObjectBuilder properties;
+        if (primitive.containsKey("properties") && primitive.get("properties").getValueType() == JsonValue.ValueType.OBJECT) {
+            properties = Json.createObjectBuilder(primitive.getJsonObject("properties"));
+        } else {
+            properties = Json.createObjectBuilder();
+        }
+        properties.addAll(propertiesBuilder);
+        replacementPrimitive.add("properties", properties);
+        featuresMessageBuilder.add(replacementPrimitive);
+        for (int i = 1; i < featureArray.size(); i++) {
+            featuresMessageBuilder.add(featureArray.get(i));
+        }
+        // For now, don't add any cooperativeWork objects, as JOSM should be able to find the fixes.
+        // This should change if the ValidatorCLI can use plugins (especially those introducing external data, like
+        // the ElevationProfile plugin (which provides elevation data)).
+        jsonObjectBuilder.add("type", "FeatureCollection");
+        jsonObjectBuilder.add("features", featuresMessageBuilder);
+        return Optional.of(jsonObjectBuilder.build());
+    }
+}

src/org/openstreetmap/josm/io/GeoJSONWriter.java

@@ -6 +6 @@
 import java.io.Writer;
 import java.math.BigDecimal;
 import java.math.RoundingMode;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
-import java.util.Map.Entry;
 import java.util.Set;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 import javax.json.Json;
@@ -30 +34 @@
 import org.openstreetmap.josm.data.coor.EastNorth;
 import org.openstreetmap.josm.data.coor.LatLon;
 import org.openstreetmap.josm.data.osm.DataSet;
+import org.openstreetmap.josm.data.osm.INode;
+import org.openstreetmap.josm.data.osm.IWay;
 import org.openstreetmap.josm.data.osm.MultipolygonBuilder;
-import org.openstreetmap.josm.data.osm.MultipolygonBuilder.JoinedPolygon;
 import org.openstreetmap.josm.data.osm.Node;
 import org.openstreetmap.josm.data.osm.OsmPrimitive;
 import org.openstreetmap.josm.data.osm.Relation;
+import org.openstreetmap.josm.data.osm.RelationMember;
 import org.openstreetmap.josm.data.osm.Way;
 import org.openstreetmap.josm.data.osm.visitor.OsmPrimitiveVisitor;
 import org.openstreetmap.josm.data.preferences.BooleanProperty;
 import org.openstreetmap.josm.data.projection.Projection;
 import org.openstreetmap.josm.data.projection.Projections;
 import org.openstreetmap.josm.gui.mappaint.ElemStyles;
+import org.openstreetmap.josm.tools.Geometry;
 import org.openstreetmap.josm.tools.Logging;
 import org.openstreetmap.josm.tools.Pair;
+import org.openstreetmap.josm.tools.Utils;
 
 /**
  * Writes OSM data as a GeoJSON string, using JSR 353: Java API for JSON Processing (JSON-P).
@@ -51 +59 @@
  */
 public class GeoJSONWriter {
 
+    enum Options {
+        /** If using the right hand rule, we have to ensure that the "right" side is the interior of the object. */
+        RIGHT_HAND_RULE,
+        /** Write OSM information to the feature properties field. This tries to follow the Overpass turbo format. */
+        WRITE_OSM_INFORMATION,
+        /** Skip empty nodes */
+        SKIP_EMPTY_NODES
+    }
+
     private final DataSet data;
-    private final Projection projection;
+    private static final Projection projection = Projections.getProjectionByCode("EPSG:4326"); // WGS 84
     private static final BooleanProperty SKIP_EMPTY_NODES = new BooleanProperty("geojson.export.skip-empty-nodes", true);
     private static final BooleanProperty UNTAGGED_CLOSED_IS_POLYGON = new BooleanProperty("geojson.export.untagged-closed-is-polygon", false);
     private static final Set<Way> processedMultipolygonWays = new HashSet<>();
+    private EnumSet<Options> options = EnumSet.noneOf(Options.class);
 
     /**
      * This is used to determine that a tag should be interpreted as a json
@@ -77 +95 @@
      */
     public GeoJSONWriter(DataSet ds) {
         this.data = ds;
-        this.projection = Projections.getProjectionByCode("EPSG:4326"); // WGS 84
+        if (Boolean.TRUE.equals(SKIP_EMPTY_NODES.get())) {
+            this.options.add(Options.SKIP_EMPTY_NODES);
+        }
+    }
+
+    /**
+     * Set the options for this writer. See {@link Options}.
+     * @param options The options to set.
+     */
+    void setOptions(final Options... options) {
+        this.options.clear();
+        this.options.addAll(Arrays.asList(options));
     }
 
     /**
@@ -117 +146 @@
         }
     }
 
+    /**
+     * Convert a primitive to a json object
+     */
     private class GeometryPrimitiveVisitor implements OsmPrimitiveVisitor {
 
         private final JsonObjectBuilder geomObj;
@@ -141 +173 @@
                     // no need to write this object again
                     return;
                 }
-                final JsonArrayBuilder array = getCoorsArray(w.getNodes());
                 boolean writeAsPolygon = w.isClosed() && ((!w.isTagged() && UNTAGGED_CLOSED_IS_POLYGON.get())
                         || ElemStyles.hasAreaElemStyle(w, false));
+                final List<Node> nodes = w.getNodes();
+                if (writeAsPolygon && options.contains(Options.RIGHT_HAND_RULE) && Geometry.isClockwise(nodes)) {
+                    Collections.reverse(nodes);
+                }
+                final JsonArrayBuilder array = getCoorsArray(nodes);
                 if (writeAsPolygon) {
                     geomObj.add("type", "Polygon");
                     geomObj.add("coordinates", Json.createArrayBuilder().add(array));
@@ -159 +195 @@
             if (r == null || !r.isMultipolygon() || r.hasIncompleteMembers()) {
                 return;
             }
-            try {
-                final Pair<List<JoinedPolygon>, List<JoinedPolygon>> mp = MultipolygonBuilder.joinWays(r);
+            if (r.isMultipolygon()) {
+                try {
+                    this.visitMultipolygon(r);
+                    return;
+                } catch (MultipolygonBuilder.JoinedPolygonCreationException ex) {
+                    Logging.warn("GeoJSON: Failed to export multipolygon {0}, falling back to other multi geometry types", r.getUniqueId());
+                    Logging.warn(ex);
+                }
+            }
+            // These are run if (a) r is not a multipolygon or (b) r is not a well-formed multipolygon.
+            if (r.getMemberPrimitives().stream().allMatch(IWay.class::isInstance)) {
+                this.visitMultiLineString(r);
+            } else if (r.getMemberPrimitives().stream().allMatch(INode.class::isInstance)) {
+                this.visitMultiPoints(r);
+            } else {
+                this.visitMultiGeometry(r);
+            }
+        }
+
+        /**
+         * Visit a multi-part geometry.
+         * Note: Does not currently recurse down relations. RFC 7946 indicates that we
+         * should avoid nested geometry collections. This behavior may change any time in the future!
+         * @param r The relation to visit.
+         */
+        private void visitMultiGeometry(final Relation r) {
+            final JsonArrayBuilder jsonArrayBuilder = Json.createArrayBuilder();
+            r.getMemberPrimitives().stream().filter(p -> !(p instanceof Relation))
+                    .map(p -> {
+                        final JsonObjectBuilder tempGeomObj = Json.createObjectBuilder();
+                        p.accept(new GeometryPrimitiveVisitor(tempGeomObj));
+                        return tempGeomObj.build();
+                    }).forEach(jsonArrayBuilder::add);
+            geomObj.add("type", "GeometryCollection");
+            geomObj.add("geometries", jsonArrayBuilder);
+        }
+
+        /**
+         * Visit a relation that only contains points
+         * @param r The relation to visit
+         */
+        private void visitMultiPoints(final Relation r) {
+            final JsonArrayBuilder multiPoint = Json.createArrayBuilder();
+            r.getMembers().stream().map(RelationMember::getMember).filter(Node.class::isInstance).map(Node.class::cast)
+                    .map(Node::getCoor).map(latLon -> getCoorArray(null, latLon))
+                    .forEach(multiPoint::add);
+            geomObj.add("type", "MultiPoint");
+            geomObj.add("coordinates", multiPoint);
+        }
+
+        /**
+         * Visit a relation that is a multi line string
+         * @param r The relation to convert
+         */
+        private void visitMultiLineString(final Relation r) {
+            final JsonArrayBuilder multiLine = Json.createArrayBuilder();
+            r.getMembers().stream().map(RelationMember::getMember).filter(Way.class::isInstance).map(Way.class::cast)
+                    .map(Way::getNodes).map(p -> {
+                JsonArrayBuilder array = getCoorsArray(p);
+                LatLon ll = p.get(0).getCoor();
+                // since first node is not duplicated as last node
+                return ll != null ? array.add(getCoorArray(null, ll)) : array;
+            }).forEach(multiLine::add);
+            geomObj.add("type", "MultiLineString");
+            geomObj.add("coordinates", multiLine);
+            processedMultipolygonWays.addAll(r.getMemberPrimitives(Way.class));
+        }
+
+        /**
+         * Convert a multipolygon to geojson
+         * @param r The relation to convert
+         * @throws MultipolygonBuilder.JoinedPolygonCreationException See {@link MultipolygonBuilder#joinWays(Relation)}.
+         * Note that if the exception is thrown, {@link #geomObj} will not have been modified.
+         */
+        private void visitMultipolygon(final Relation r) throws MultipolygonBuilder.JoinedPolygonCreationException {
+                final Pair<List<MultipolygonBuilder.JoinedPolygon>, List<MultipolygonBuilder.JoinedPolygon>> mp =
+                        MultipolygonBuilder.joinWays(r);
                 final JsonArrayBuilder polygon = Json.createArrayBuilder();
-                Stream.concat(mp.a.stream(), mp.b.stream())
+                // Peek would theoretically be better for these two streams, but SonarLint doesn't like it.
+                // java:S3864: "Stream.peek" should be used with caution
+                final Stream<List<Node>> outer = mp.a.stream().map(MultipolygonBuilder.JoinedPolygon::getNodes).map(nodes -> {
+                    final ArrayList<Node> tempNodes = new ArrayList<>(nodes);
+                    tempNodes.add(tempNodes.get(0));
+                    if (options.contains(Options.RIGHT_HAND_RULE) && Geometry.isClockwise(tempNodes)) {
+                        Collections.reverse(nodes);
+                    }
+                    return nodes;
+                });
+                final Stream<List<Node>> inner = mp.b.stream().map(MultipolygonBuilder.JoinedPolygon::getNodes).map(nodes -> {
+                    final ArrayList<Node> tempNodes = new ArrayList<>(nodes);
+                    tempNodes.add(tempNodes.get(0));
+                    // Note that we are checking !Geometry.isClockwise, which is different from the outer
+                    // ring check.
+                    if (options.contains(Options.RIGHT_HAND_RULE) && !Geometry.isClockwise(tempNodes)) {
+                        Collections.reverse(nodes);
+                    }
+                    return nodes;
+                });
+                Stream.concat(outer, inner)
                         .map(p -> {
-                            JsonArrayBuilder array = getCoorsArray(p.getNodes());
-                            LatLon ll = p.getNodes().get(0).getCoor();
+                            JsonArrayBuilder array = getCoorsArray(p);
+                            LatLon ll = p.get(0).getCoor();
                             // since first node is not duplicated as last node
                             return ll != null ? array.add(getCoorArray(null, ll)) : array;
-                            })
+                        })
                         .forEach(polygon::add);
-                geomObj.add("type", "MultiPolygon");
                 final JsonArrayBuilder multiPolygon = Json.createArrayBuilder().add(polygon);
+                geomObj.add("type", "MultiPolygon");
                 geomObj.add("coordinates", multiPolygon);
                 processedMultipolygonWays.addAll(r.getMemberPrimitives(Way.class));
-            } catch (MultipolygonBuilder.JoinedPolygonCreationException ex) {
-                Logging.warn("GeoJSON: Failed to export multipolygon {0}", r.getUniqueId());
-                Logging.warn(ex);
-            }
         }
 
         private JsonArrayBuilder getCoorsArray(Iterable<Node> nodes) {
@@ -204 +331 @@
 
     protected void appendPrimitive(OsmPrimitive p, JsonArrayBuilder array) {
         if (p.isIncomplete() ||
-            (SKIP_EMPTY_NODES.get() && p instanceof Node && p.getKeys().isEmpty())) {
+            (this.options.contains(Options.SKIP_EMPTY_NODES) && p instanceof Node && p.getKeys().isEmpty())) {
             return;
         }
 
         // Properties
         final JsonObjectBuilder propObj = Json.createObjectBuilder();
-        for (Entry<String, String> t : p.getKeys().entrySet()) {
-            propObj.add(t.getKey(), convertValueToJson(t.getValue()));
+        for (Map.Entry<String, String> t : p.getKeys().entrySet()) {
+            // If writing OSM information, follow Overpass syntax (escape `@` with another `@`)
+            final String key = options.contains(Options.WRITE_OSM_INFORMATION) && t.getKey().startsWith("@")
+                    ? '@' + t.getKey() : t.getKey();
+            propObj.add(key, convertValueToJson(t.getValue()));
+        }
+        if (options.contains(Options.WRITE_OSM_INFORMATION)) {
+            // Use the same format as Overpass
+            propObj.add("@id", p.getPrimitiveId().getType().getAPIName() + '/' + p.getUniqueId()); // type/id
+            if (!p.isNew()) {
+                propObj.add("@timestamp", Instant.ofEpochSecond(p.getRawTimestamp()).toString());
+                propObj.add("@version", Integer.toString(p.getVersion()));
+                propObj.add("@changeset", Long.toString(p.getChangesetId()));
+            }
+            if (p.getUser() != null) {
+                propObj.add("@user", p.getUser().getName());
+                propObj.add("@uid", p.getUser().getId());
+            }
+            if (options.contains(Options.WRITE_OSM_INFORMATION) && p.getReferrers(true).stream().anyMatch(Relation.class::isInstance)) {
+                final JsonArrayBuilder jsonArrayBuilder = Json.createArrayBuilder();
+                for (Relation relation : Utils.filteredCollection(p.getReferrers(), Relation.class)) {
+                    final JsonObjectBuilder relationObject = Json.createObjectBuilder();
+                    relationObject.add("rel", relation.getId());
+                    Collection<RelationMember> members = relation.getMembersFor(Collections.singleton(p));
+                    // Each role is a separate object in overpass-turbo geojson export. For now, just concat them.
+                    relationObject.add("role",
+                            members.stream().map(RelationMember::getRole).collect(Collectors.joining(";")));
+                    final JsonObjectBuilder relationKeys = Json.createObjectBuilder();
+                    // Uncertain if the @relation reltags need to be @ escaped. I don't think so, as example output
+                    // didn't have any metadata in it.
+                    for (Map.Entry<String, String> tag : relation.getKeys().entrySet()) {
+                        relationKeys.add(tag.getKey(), convertValueToJson(tag.getValue()));
+                    }
+                    relationObject.add("reltags", relationKeys);
+                }
+                propObj.add("@relations", jsonArrayBuilder);
+            }
         }
         final JsonObject prop = propObj.build();
 

new file test/unit/org/openstreetmap/josm/data/validation/ValidatorCLITest.java

@@ +1 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.data.validation;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.fail;
+
+import java.io.ByteArrayInputStream;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Function;
+import java.util.logging.Handler;
+import java.util.logging.LogRecord;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+import javax.json.Json;
+import javax.json.JsonObject;
+import javax.json.JsonReader;
+
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.junit.jupiter.params.provider.ValueSource;
+import org.openstreetmap.josm.TestUtils;
+import org.openstreetmap.josm.spi.lifecycle.Lifecycle;
+import org.openstreetmap.josm.tools.Logging;
+import org.openstreetmap.josm.tools.Utils;
+
+import mockit.Mock;
+import mockit.MockUp;
+
+/**
+ * Test class for {@link ValidatorCLI}
+ * @author Taylor Smock
+ */
+class ValidatorCLITest {
+    @TempDir
+    static File temporaryDirectory;
+
+    TestHandler handler;
+
+    @BeforeEach
+    void setup() {
+        TestUtils.assumeWorkingJMockit();
+        new LifecycleMock();
+        this.handler = new TestHandler();
+        Logging.getLogger().addHandler(this.handler);
+    }
+
+    @AfterEach
+    void tearDown() {
+        Logging.getLogger().removeHandler(this.handler);
+        this.handler.close();
+        this.handler = null;
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"resources/styles/standard/elemstyles.mapcss", "resources/styles/standard/potlatch2.mapcss"})
+    void testInternalMapcss(final String resourceLocation) {
+        new ValidatorCLI().processArguments(new String[]{"--input", resourceLocation});
+        assertEquals(2, this.handler.logRecordList.size());
+        assertEquals(resourceLocation + " had no errors", this.handler.logRecordList.get(0).getMessage());
+        assertTrue(this.handler.logRecordList.get(1).getMessage().contains("Finishing task"));
+    }
+
+    static Stream<Arguments> testInternalValidatorMapcss() {
+        return Stream.of(new File("resources/data/validator").listFiles())
+                .filter(file -> file.getPath().endsWith(".mapcss"))
+                .map(file -> {
+                    // External validator mapcss files must have validator.mapcss as the extension.
+                    final String renamedValidator = file.getName().endsWith(".validator.mapcss") ?
+                            file.getName() : file.getName().replace(".mapcss", ".validator.mapcss");
+                    try {
+                        return Files.copy(file.toPath(), Paths.get(temporaryDirectory.getPath(), renamedValidator)).getFileName().toString();
+                    } catch (IOException e) {
+                        fail(e);
+                    }
+                    return null;
+                }).map(Arguments::of);
+    }
+
+    @ParameterizedTest
+    @MethodSource
+    void testInternalValidatorMapcss(final String resourceLocation) {
+
+        final String path = Paths.get(temporaryDirectory.getPath(), resourceLocation).toString();
+        new ValidatorCLI().processArguments(new String[]{"--input", path});
+        assertEquals(2, this.handler.logRecordList.size());
+        assertEquals(path + " had no errors", this.handler.logRecordList.get(0).getMessage());
+        assertTrue(this.handler.logRecordList.get(1).getMessage().contains("Finishing task"));
+    }
+
+    @Test
+    void testBadDataTicket13165() {
+        // Ticket #13165 was a validator non-regression test.
+        final String dataPath = TestUtils.getRegressionDataFile(13165, "13165.osm");
+        final String outputPath = Paths.get(temporaryDirectory.getPath(), "testBadDataTicket13165.geojson").toString();
+        new ValidatorCLI().processArguments(new String[]{"--input", dataPath, "--output", outputPath});
+        final File outputFile = new File(outputPath);
+        assertTrue(outputFile.exists());
+        final List<String> lines = assertDoesNotThrow(() -> Files.readAllLines(outputFile.toPath()));
+        lines.replaceAll(line -> Utils.strip(line.replace((char) 0x1e, ' ')));
+        final List<JsonObject> errors = lines.stream().map(str -> Json.createReader(new ByteArrayInputStream(str.getBytes(
+                StandardCharsets.UTF_8)))).map(JsonReader::readObject).collect(Collectors.toList());
+        final Function<JsonObject, String> getMessage = obj -> obj.getJsonArray("features").getValuesAs(JsonObject.class)
+                .stream().filter(feature -> feature.containsKey("properties")).map(feature -> feature.getJsonObject("properties"))
+                .filter(properties -> properties.containsKey("message")).map(properties -> properties.getJsonString("message").getString())
+                .collect(Collectors.joining(","));
+        assertEquals(3, errors.stream().map(getMessage).filter("Overlapping Identical Landuses"::equals).count());
+        assertEquals(3, errors.stream().map(getMessage).filter("No area style for multipolygon"::equals).count());
+    }
+
+    /**
+     * This exists to avoid exiting the tests.
+     */
+    private static final class LifecycleMock extends MockUp<Lifecycle> {
+        @Mock
+        public static boolean exitJosm(boolean exit, int exitCode) {
+            // No-op for now
+            return true;
+        }
+    }
+
+    private static final class TestHandler extends Handler {
+        final List<LogRecord> logRecordList = new ArrayList<>();
+
+        @Override
+        public void publish(LogRecord record) {
+            this.logRecordList.add(record);
+        }
+
+        @Override
+        public void flush() {
+            this.logRecordList.clear();
+        }
+
+        @Override
+        public void close() throws SecurityException {
+            this.flush();
+        }
+    }
+}