2: Add --exclude option and --help

src/main/java/com/bartek/esa/EsaMain.java

@@ -1,10 +1,10 @@
 package com.bartek.esa;
 
 import com.bartek.esa.cli.model.CliArgsOptions;
-import com.bartek.esa.dispatcher.dispatcher.MethodDispatcher;
-import com.bartek.esa.dispatcher.model.DispatcherActions;
 import com.bartek.esa.cli.parser.CliArgsParser;
 import com.bartek.esa.di.DaggerDependencyInjector;
+import com.bartek.esa.dispatcher.dispatcher.MethodDispatcher;
+import com.bartek.esa.dispatcher.model.DispatcherActions;
 
 import javax.inject.Inject;
 

src/main/java/com/bartek/esa/cli/model/CliArgsOptions.java

@@ -3,11 +3,15 @@ package com.bartek.esa.cli.model;
 import lombok.Builder;
 import lombok.Data;
 
+import java.util.Collections;
+import java.util.List;
+
 @Data
 @Builder
 public class CliArgsOptions {
     private String sourceAnalysisDirectory;
     private String apkAuditFile;
+    private List<String> excludes;
 
     public boolean isSourceAnalysis() {
         return sourceAnalysisDirectory != null;
@@ -16,4 +20,12 @@ public class CliArgsOptions {
     public boolean isApkAudit() {
         return apkAuditFile != null;
     }
+
+    public static CliArgsOptions empty() {
+        return CliArgsOptions.builder()
+                .sourceAnalysisDirectory(null)
+                .apkAuditFile(null)
+                .excludes(Collections.emptyList())
+                .build();
+    }
 }

src/main/java/com/bartek/esa/cli/parser/CliArgsParser.java

@@ -1,39 +1,66 @@
 package com.bartek.esa.cli.parser;
 
 import com.bartek.esa.cli.model.CliArgsOptions;
-import com.bartek.esa.error.EsaException;
-import io.vavr.control.Try;
 import org.apache.commons.cli.*;
 
 import javax.inject.Inject;
 
+import static java.util.Arrays.asList;
+import static java.util.Collections.emptyList;
+
 public class CliArgsParser {
     private static final String SRC_OPT = "src";
     private static final String APK_OPT = "apk";
+    private static final String EXCLUDE_OPT = "exclude";
+    private static final String HELP_OPT = "help";
 
     @Inject
     public CliArgsParser() {}
 
     public CliArgsOptions parse(String[] args) {
-        CommandLine command = Try.of(() -> new DefaultParser().parse(prepareOptions(), args))
+        try {
-                .getOrElseThrow(EsaException::new);
+            CommandLine command = new DefaultParser().parse(prepareOptions(), args);
 
-        return CliArgsOptions.builder()
+            if (command.hasOption(HELP_OPT)) {
-                .sourceAnalysisDirectory(command.hasOption(SRC_OPT) ? command.getOptionValue(SRC_OPT) : null)
+                printHelp();
-                .apkAuditFile(command.hasOption(APK_OPT) ? command.getOptionValue(APK_OPT) : null)
+                return CliArgsOptions.empty();
-                .build();
+            }
+
+            boolean isNeitherAuditNorAnalysis = !command.hasOption(SRC_OPT) && !command.hasOption(APK_OPT);
+            if (isNeitherAuditNorAnalysis) {
+                printHelp();
+                return CliArgsOptions.empty();
+            }
+
+            return CliArgsOptions.builder()
+                    .sourceAnalysisDirectory(command.hasOption(SRC_OPT) ? command.getOptionValue(SRC_OPT) : null)
+                    .apkAuditFile(command.hasOption(APK_OPT) ? command.getOptionValue(APK_OPT) : null)
+                    .excludes(command.hasOption(EXCLUDE_OPT) ? asList(command.getOptionValues(EXCLUDE_OPT)) : emptyList())
+                    .build();
+        } catch (ParseException e) {
+            printHelp();
+            return CliArgsOptions.empty();
+        }
+    }
+
+    private void printHelp() {
+        HelpFormatter formatter = new HelpFormatter();
+        formatter.printHelp("esa", prepareOptions(), true);
     }
 
     private Options prepareOptions() {
         Options options = new Options();
         options.addOption(source());
         options.addOption(apk());
+        options.addOption(exclude());
+        options.addOption(help());
         return options;
     }
 
     private Option source() {
         return Option.builder()
                 .longOpt(SRC_OPT)
+                .argName("SOURCE_PATH")
                 .hasArg()
                 .desc("perform analysis for Java code and XML resources")
                 .build();
@@ -42,8 +69,26 @@ public class CliArgsParser {
     private Option apk() {
         return Option.builder()
                 .longOpt(APK_OPT)
+                .argName("APK_PATH")
                 .hasArg()
                 .desc("perform audit for compiled APK file")
                 .build();
     }
+
+    private Option exclude() {
+        return Option.builder()
+                .longOpt(EXCLUDE_OPT)
+                .argName("CODES")
+                .numberOfArgs(Option.UNLIMITED_VALUES)
+                .desc("exclude particular security checks from audit/analysis")
+                .build();
+    }
+    
+    private Option help() {
+        return Option.builder()
+                .longOpt(HELP_OPT)
+                .argName("h")
+                .desc("print this help")
+                .build();
+    }
 }