Fix CLI version option (#756)

Author: DrSatyr

.gitignore

@@ -17,3 +17,6 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 target/
+
+# IDE files
+.vscode/settings.json

cli/pom.xml

@@ -57,6 +57,9 @@
                             <transformers>
                                 <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>${mainClass}</mainClass>
+                                    <manifestEntries>
+                                        <Implementation-Version>${project.version}</Implementation-Version>
+                                    </manifestEntries>
                                 </transformer>
                               <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                               <transformer implementation="org.apache.maven.plugins.shade.resource.ApacheLicenseResourceTransformer" />
@@ -89,6 +92,9 @@
                                     <transformers>
                                         <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                             <mainClass>${mainClass}</mainClass>
+                                            <manifestEntries>
+                                                <Implementation-Version>${project.version}</Implementation-Version>
+                                            </manifestEntries>
                                         </transformer>
                                         <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
                                         <transformer implementation="org.apache.maven.plugins.shade.resource.ApacheLicenseResourceTransformer" />

cli/src/main/java/org/openapitools/openapidiff/cli/Main.java

@@ -35,7 +35,10 @@ public static void main(String... args) {
     Options options = new Options();
     options.addOption(Option.builder("h").longOpt("help").desc("print this message").build());
     options.addOption(
-        Option.builder().longOpt("version").desc("print the version information and exit").build());
+        Option.builder("v")
+            .longOpt("version")
+            .desc("print the version information and exit")
+            .build());
     options.addOption(
         Option.builder()
             .longOpt("state")
@@ -72,6 +75,7 @@ public static void main(String... args) {
     options.addOption(Option.builder().longOpt("warn").desc("Print warning information").build());
     options.addOption(Option.builder().longOpt("error").desc("Print error information").build());
     options.addOption(Option.builder().longOpt("off").desc("No information printed").build());
+    options.addOption(Option.builder().longOpt("off").desc("No information printed").build());
     options.addOption(
         Option.builder("l")
             .longOpt("log")
@@ -149,6 +153,11 @@ public static void main(String... args) {
         printHelp(options);
         System.exit(0);
       }
+      if (line.hasOption("version") || line.hasOption("v")) {
+        String version = Main.class.getPackage().getImplementationVersion();
+        System.out.println("openapi-diff version: " + (version != null ? version : "DEV"));
+        System.exit(0);
+      }
       String logLevel = "ERROR";
       if (line.hasOption("off")) {
         logLevel = "OFF";