cli: move specific code from common jadx args

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

@@ -1,13 +1,49 @@
 package jadx.cli;
 
 import jadx.api.Decompiler;
+import jadx.core.utils.exceptions.JadxException;
+
+import java.io.File;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class JadxCLI {
+	private static final Logger LOG = LoggerFactory.getLogger(JadxCLI.class);
 
 	public static void main(String[] args) {
-		JadxArgs jadxArgs = new JadxArgs(args, true);
-		Decompiler jadx = new Decompiler(jadxArgs);
-		jadx.processAndSaveAll();
-		System.exit(jadx.getErrorsCount());
+		try {
+			JadxCLIArgs jadxArgs = new JadxCLIArgs(args);
+			checkArgs(jadxArgs);
+			Decompiler jadx = new Decompiler(jadxArgs);
+			jadx.processAndSaveAll();
+			System.exit(jadx.getErrorsCount());
+		} catch (Throwable e) {
+			LOG.error(e.getMessage());
+			System.exit(1);
+		}
+	}
+
+	private static void checkArgs(JadxCLIArgs jadxArgs) throws JadxException {
+		if (jadxArgs.getInput().isEmpty())
+			throw new JadxException("Please specify input file");
+
+		File outputDir = jadxArgs.getOutDir();
+		if (outputDir == null) {
+			String outDirName;
+			File file = jadxArgs.getInput().get(0);
+			String name = file.getName();
+			int pos = name.lastIndexOf('.');
+			if (pos != -1)
+				outDirName = name.substring(0, pos);
+			else
+				outDirName = name + "-jadx-out";
+
+			LOG.info("output directory: " + outDirName);
+			outputDir = new File(outDirName);
+			jadxArgs.setOutputDir(outputDir);
+		}
+		if (outputDir.exists() && !outputDir.isDirectory())
+			throw new JadxException("Output directory exists as file " + outputDir);
 	}
 }