feat: allow to load directories

jadx-core/src/main/java/jadx/api/JadxArgsValidator.java

@@ -85,9 +85,6 @@ public class JadxArgsValidator {
 		if (!file.exists()) {
 			throw new JadxArgsValidateException("File not found " + file.getAbsolutePath());
 		}
-		if (file.isDirectory()) {
-			throw new JadxArgsValidateException("Expected file but found directory instead: " + file.getAbsolutePath());
-		}
 	}
 
 	private static void checkDir(File dir, String desc) {

jadx-core/src/main/java/jadx/api/JadxDecompiler.java

@@ -40,6 +40,7 @@ import jadx.core.dex.visitors.SaveCode;
 import jadx.core.export.ExportGradleProject;
 import jadx.core.utils.Utils;
 import jadx.core.utils.exceptions.JadxRuntimeException;
+import jadx.core.utils.files.FileUtils;
 import jadx.core.xmlgen.BinaryXMLParser;
 import jadx.core.xmlgen.ProtoXMLParser;
 import jadx.core.xmlgen.ResContainer;
@@ -113,8 +114,9 @@ public final class JadxDecompiler implements Closeable {
 	private void loadInputFiles() {
 		loadedInputs.clear();
 		List<Path> inputPaths = Utils.collectionMap(args.getInputFiles(), File::toPath);
+		List<Path> inputFiles = FileUtils.expandDirs(inputPaths);
 		for (JadxInputPlugin inputPlugin : pluginManager.getInputPlugins()) {
-			ILoadResult loadResult = inputPlugin.loadFiles(inputPaths);
+			ILoadResult loadResult = inputPlugin.loadFiles(inputFiles);
 			if (loadResult != null && !loadResult.isEmpty()) {
 				loadedInputs.add(loadResult);
 			}

jadx-core/src/main/java/jadx/api/ResourcesLoader.java

@@ -136,7 +136,7 @@ public final class ResourcesLoader {
 	}
 
 	private void loadFile(List<ResourceFile> list, File file) {
-		if (file == null) {
+		if (file == null || file.isDirectory()) {
 			return;
 		}
 		if (FileUtils.isZipFile(file)) {

jadx-core/src/main/java/jadx/core/utils/files/FileUtils.java

@@ -8,6 +8,7 @@ import java.io.FileInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
+import java.nio.file.FileVisitOption;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
@@ -41,6 +42,26 @@ public class FileUtils {
 	private FileUtils() {
 	}
 
+	public static List<Path> expandDirs(List<Path> paths) {
+		List<Path> files = new ArrayList<>(paths.size());
+		for (Path path : paths) {
+			if (Files.isDirectory(path)) {
+				expandDir(path, files);
+			} else {
+				files.add(path);
+			}
+		}
+		return files;
+	}
+
+	private static void expandDir(Path dir, List<Path> files) {
+		try (Stream<Path> walk = Files.walk(dir, FileVisitOption.FOLLOW_LINKS)) {
+			walk.filter(Files::isRegularFile).forEach(files::add);
+		} catch (Exception e) {
+			LOG.error("Failed to list files in directory: {}", dir, e);
+		}
+	}
+
 	public static void addFileToJar(JarOutputStream jar, File source, String entryName) throws IOException {
 		try (BufferedInputStream in = new BufferedInputStream(new FileInputStream(source))) {
 			JarEntry entry = new JarEntry(entryName);

jadx-gui/src/main/java/jadx/gui/ui/MainWindow.java

@@ -323,6 +323,7 @@ public class MainWindow extends JFrame {
 		fileChooser.setFileFilter(new FileNameExtensionFilter(description, exts));
 		fileChooser.setMultiSelectionEnabled(true);
 		fileChooser.setToolTipText(toolTipText);
+		fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
 		Path currentDirectory = settings.getLastOpenFilePath();
 		if (currentDirectory != null) {
 			fileChooser.setCurrentDirectory(currentDirectory.toFile());

jadx-plugins/jadx-java-convert/src/main/java/jadx/plugins/input/javaconvert/JavaConvertLoader.java

@@ -36,7 +36,6 @@ public class JavaConvertLoader {
 	private static void processJars(List<Path> input, ConvertResult result) {
 		PathMatcher jarMatcher = FileSystems.getDefault().getPathMatcher("glob:**.jar");
 		input.stream()
-				.filter(path -> Files.isRegularFile(path, LinkOption.NOFOLLOW_LINKS))
 				.filter(jarMatcher::matches)
 				.forEach(path -> {
 					try {
@@ -50,7 +49,6 @@ public class JavaConvertLoader {
 	private static void processClassFiles(List<Path> input, ConvertResult result) {
 		PathMatcher jarMatcher = FileSystems.getDefault().getPathMatcher("glob:**.class");
 		List<Path> clsFiles = input.stream()
-				.filter(path -> Files.isRegularFile(path, LinkOption.NOFOLLOW_LINKS))
 				.filter(jarMatcher::matches)
 				.collect(Collectors.toList());
 		if (clsFiles.isEmpty()) {
@@ -78,7 +76,6 @@ public class JavaConvertLoader {
 	private static void processAars(List<Path> input, ConvertResult result) {
 		PathMatcher aarMatcher = FileSystems.getDefault().getPathMatcher("glob:**.aar");
 		input.stream()
-				.filter(path -> Files.isRegularFile(path, LinkOption.NOFOLLOW_LINKS))
 				.filter(aarMatcher::matches)
 				.forEach(path -> ZipSecurity.readZipEntries(path.toFile(), (entry, in) -> {
 					try {

jadx-plugins/jadx-smali-input/src/main/java/jadx/plugins/input/smali/SmaliConvert.java

@@ -7,7 +7,6 @@ import java.io.OutputStream;
 import java.io.PrintStream;
 import java.nio.file.FileSystems;
 import java.nio.file.Files;
-import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.PathMatcher;
 import java.util.Collections;
@@ -32,10 +31,10 @@ public class SmaliConvert implements Closeable {
 		if (smaliFiles.isEmpty()) {
 			return false;
 		}
+		LOG.debug("Compiling smali files: {}", smaliFiles.size());
 		try {
 			this.tmpDex = Files.createTempFile("jadx-", ".dex");
-			boolean result = compileSmali(tmpDex, smaliFiles);
-			if (result) {
+			if (compileSmali(tmpDex, smaliFiles)) {
 				return true;
 			}
 		} catch (Exception e) {
@@ -82,7 +81,6 @@ public class SmaliConvert implements Closeable {
 	private List<Path> filterSmaliFiles(List<Path> input) {
 		PathMatcher matcher = FileSystems.getDefault().getPathMatcher("glob:**.smali");
 		return input.stream()
-				.filter(p -> Files.isRegularFile(p, LinkOption.NOFOLLOW_LINKS))
 				.filter(matcher::matches)
 				.collect(Collectors.toList());
 	}