using shadowJar to build a runnable version

.gitignore

@@ -87,3 +87,4 @@ local.properties
 #.project
 
 /.gradle/
+/build/

build.gradle

@@ -1,9 +1,13 @@
 plugins {
   id 'java'
+  id 'application'
+  id 'com.github.johnrengelman.shadow' version '8.0.0'
 }
 
 group 'de.jottyfan.csv2camt'
-version '0.0.0'
+version '0.0.1'
+
+mainClassName = 'de.jottyfan.csv2camt.Main'
 
 repositories {
   mavenCentral()
@@ -16,4 +20,14 @@ dependencies {
   
   testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.3'
   testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.11.3'
-}
+}
+
+shadowJar {
+  manifest {
+    attributes(
+      'Main-Class': mainClassName,
+      'Implementation-Title': project.name,
+      'Implementation-Version': version
+    )
+  }
+}

src/main/java/de/jottyfan/csv2camt/Main.java

@@ -7,6 +7,15 @@ package de.jottyfan.csv2camt;
  */
 public class Main {
 	public static void main(String[] args) throws Exception {
-		new Converter().readCsv(args[1]).writeCamt();
+		Package pkg = Main.class.getPackage();
+		String version = (pkg == null || pkg.getImplementationVersion() == null) ? "?" : pkg.getImplementationVersion();
+		System.out.println("--------------------------------------");
+		System.out.println(String.format("-  csv2camt - version %s", version));
+		System.out.println("--------------------------------------");
+		if (args.length < 1) {
+			System.out.println(String.format("usage: java -jar csv2camt-%s-all.jar filename.csv", version));
+		} else {
+			new Converter().readCsv(args[0]).writeCamt();
+		}
 	}
 }