refactor: move filesystem case sensitivity value to JadxArgs

jadx-cli/src/main/java/jadx/cli/JadxCLI.java

 package jadx.cli;
 
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import jadx.api.JadxArgs;
 import jadx.api.JadxDecompiler;
 import jadx.core.utils.exceptions.JadxArgsValidateException;
+import jadx.core.utils.files.FileUtils;
 
 public class JadxCLI {
 	private static final Logger LOG = LoggerFactory.getLogger(JadxCLI.class);
@@ -25,7 +31,9 @@ public class JadxCLI {
 	}
 
 	static int processAndSave(JadxCLIArgs inputArgs) {
-		JadxDecompiler jadx = new JadxDecompiler(inputArgs.toJadxArgs());
+		JadxArgs args = inputArgs.toJadxArgs();
+		args.setFsCaseSensitive(getFsCaseSensitivity(args));
+		JadxDecompiler jadx = new JadxDecompiler(args);
 		try {
 			jadx.load();
 		} catch (JadxArgsValidateException e) {
@@ -42,4 +50,14 @@ public class JadxCLI {
 		}
 		return errorsCount;
 	}
+
+	private static boolean getFsCaseSensitivity(JadxArgs args) {
+		List<File> testDirList = new ArrayList<>(3);
+		testDirList.add(args.getOutDir());
+		testDirList.add(args.getOutDirSrc());
+		if (!args.getInputFiles().isEmpty()) {
+			testDirList.add(args.getInputFiles().get(0));
+		}
+		return FileUtils.isCaseSensitiveFS(testDirList);
+	}
 }

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

@@ -2,6 +2,7 @@ package jadx.api;
 
 import java.io.File;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 public class JadxArgs {
@@ -44,6 +45,8 @@ public class JadxArgs {
 	private boolean respectBytecodeAccModifiers = false;
 	private boolean exportAsGradleProject = false;
 
+	private boolean isFsCaseSensitive;
+
 	public JadxArgs() {
 		// use default options
 	}
@@ -58,6 +61,10 @@ public class JadxArgs {
 		return inputFiles;
 	}
 
+	public void setInputFile(File inputFile) {
+		this.inputFiles = Collections.singletonList(inputFile);
+	}
+
 	public void setInputFiles(List<File> inputFiles) {
 		this.inputFiles = inputFiles;
 	}
@@ -230,6 +237,14 @@ public class JadxArgs {
 		this.exportAsGradleProject = exportAsGradleProject;
 	}
 
+	public boolean isFsCaseSensitive() {
+		return isFsCaseSensitive;
+	}
+
+	public void setFsCaseSensitive(boolean fsCaseSensitive) {
+		isFsCaseSensitive = fsCaseSensitive;
+	}
+
 	@Override
 	public String toString() {
 		final StringBuilder sb = new StringBuilder("JadxArgs{");

jadx-core/src/main/java/jadx/core/dex/visitors/RenameVisitor.java

@@ -20,7 +20,6 @@ import jadx.core.dex.nodes.DexNode;
 import jadx.core.dex.nodes.FieldNode;
 import jadx.core.dex.nodes.MethodNode;
 import jadx.core.dex.nodes.RootNode;
-import jadx.core.utils.files.FileUtils;
 import jadx.core.utils.files.InputFile;
 
 public class RenameVisitor extends AbstractVisitor {
@@ -45,8 +44,7 @@ public class RenameVisitor extends AbstractVisitor {
 		if (deobfuscationOn) {
 			deobfuscator.execute();
 		}
-		boolean isCaseSensitive = FileUtils.isCaseSensitiveFS(new File(inputPath)); // args.getOutDir() - not set in gui
-		checkClasses(root, isCaseSensitive);
+		checkClasses(root, args.isFsCaseSensitive());
 	}
 
 	private void checkClasses(RootNode root, boolean caseSensitive) {

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

@@ -13,6 +13,7 @@ import java.util.ArrayList;
 import java.util.Enumeration;
 import java.util.List;
 import java.util.Objects;
+import java.util.Optional;
 import java.util.jar.JarEntry;
 import java.util.jar.JarOutputStream;
 import java.util.zip.ZipEntry;
@@ -198,8 +199,26 @@ public class FileUtils {
 		}
 	}
 
+	/**
+	 * Checks dirs in order, fist success result returned
+	 */
+	public static boolean isCaseSensitiveFS(List<File> testDirList) {
+		for (File dir : testDirList) {
+			Optional<Boolean> result = isCaseSensitiveFSInternal(dir);
+			if (result.isPresent()) {
+				return result.get();
+			}
+		}
+		return IOCase.SYSTEM.isCaseSensitive();
+	}
+
 	public static boolean isCaseSensitiveFS(File testDir) {
-		if (testDir != null) {
+		Optional<Boolean> result = isCaseSensitiveFSInternal(testDir);
+		return result.orElseGet(IOCase.SYSTEM::isCaseSensitive);
+	}
+
+	private static Optional<Boolean> isCaseSensitiveFSInternal(@Nullable File testDir) {
+		if (testDir != null && testDir.exists() && testDir.isDirectory()) {
 			File caseCheckUpper = new File(testDir, "CaseCheck");
 			File caseCheckLow = new File(testDir, "casecheck");
 			try {
@@ -208,7 +227,7 @@ public class FileUtils {
 					boolean caseSensitive = !caseCheckLow.exists();
 					LOG.debug("Filesystem at {} is {}case-sensitive", testDir.getAbsolutePath(),
 							(caseSensitive ? "" : "NOT "));
-					return caseSensitive;
+					return Optional.of(caseSensitive);
 				} else {
 					LOG.debug("Failed to create file: {}", caseCheckUpper.getAbsolutePath());
 				}
@@ -223,7 +242,7 @@ public class FileUtils {
 				}
 			}
 		}
-		return IOCase.SYSTEM.isCaseSensitive();
+		return Optional.empty();
 	}
 
 	public static File toFile(String path) {

jadx-core/src/test/java/jadx/tests/api/IntegrationTest.java

@@ -78,6 +78,7 @@ public abstract class IntegrationTest extends TestUtils {
 		args.setShowInconsistentCode(true);
 		args.setThreadsCount(1);
 		args.setSkipResources(true);
+		args.setFsCaseSensitive(false); // use same value on all systems
 	}
 
 	public ClassNode getClassNode(Class<?> clazz) {

jadx-gui/src/main/java/jadx/gui/JadxWrapper.java

 package jadx.gui;
 
+import javax.swing.*;
 import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -8,8 +9,6 @@ import java.util.List;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.stream.Collectors;
 
-import javax.swing.ProgressMonitor;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -18,6 +17,7 @@ import jadx.api.JadxDecompiler;
 import jadx.api.JavaClass;
 import jadx.api.JavaPackage;
 import jadx.api.ResourceFile;
+import jadx.core.utils.files.FileUtils;
 import jadx.gui.settings.JadxSettings;
 
 public class JadxWrapper {
@@ -34,8 +34,12 @@ public class JadxWrapper {
 	public void openFile(File file) {
 		this.openFile = file;
 		try {
-			this.decompiler = new JadxDecompiler(settings.toJadxArgs());
-			this.decompiler.getArgs().setInputFiles(Collections.singletonList(file));
+			JadxArgs jadxArgs = settings.toJadxArgs();
+			jadxArgs.setInputFile(file);
+			// output folder not known yet => use input dir as a best choice
+			jadxArgs.setFsCaseSensitive(FileUtils.isCaseSensitiveFS(file.getParentFile()));
+
+			this.decompiler = new JadxDecompiler(jadxArgs);
 			this.decompiler.load();
 		} catch (Exception e) {
 			LOG.error("Jadx init error", e);
@@ -97,6 +101,7 @@ public class JadxWrapper {
 		}).collect(Collectors.toList());
 	}
 
+	// TODO: move to CLI and filter classes in JadxDecompiler
 	public List<String> getExcludedPackages() {
 		String excludedPackages = settings.getExcludedPackages().trim();
 		if (excludedPackages.isEmpty()) {