SOP-CLI: Implement additional version flags

pgpainless-sop/src/main/java/org/pgpainless/sop/VersionImpl.java

@@ -6,6 +6,7 @@ package org.pgpainless.sop;
 
 import java.io.IOException;
 import java.io.InputStream;
+import java.util.Locale;
 import java.util.Properties;
 
 import org.bouncycastle.jce.provider.BouncyCastleProvider;
@@ -14,7 +15,7 @@ import sop.operation.Version;
 public class VersionImpl implements Version {
 
     // draft version
-    private static final String SOP_VERSION = "3";
+    private static final String SOP_VERSION = "03";
 
     @Override
     public String getName() {
@@ -42,16 +43,21 @@ public class VersionImpl implements Version {
     @Override
     public String getBackendVersion() {
         double bcVersion = new BouncyCastleProvider().getVersion();
-        return String.format("Bouncy Castle %,.2f", bcVersion);
+        return String.format(Locale.US, "Bouncy Castle %.2f", bcVersion);
     }
 
     @Override
     public String getExtendedVersion() {
         return getName() + " " + getVersion() + "\n" +
-                "Based on PGPainless " + getVersion() + "\n" +
-                "Using " + getBackendVersion() + "\n" +
-                "See https://pgpainless.org\n" +
+                "https://codeberg.org/PGPainless/pgpainless/src/branch/master/pgpainless-sop\n" +
+                "\n" +
                 "Implementation of the Stateless OpenPGP Protocol Version " + SOP_VERSION + "\n" +
-                "See https://datatracker.ietf.org/doc/html/draft-dkg-openpgp-stateless-cli-03";
+                "https://datatracker.ietf.org/doc/html/draft-dkg-openpgp-stateless-cli-" + SOP_VERSION + "\n" +
+                "\n" +
+                "Based on pgpainless-core " + getVersion() + "\n" +
+                "https://pgpainless.org\n" +
+                "\n" +
+                "Using " + getBackendVersion() + "\n" +
+                "https://www.bouncycastle.org/java.html";
     }
 }

sop-java-picocli/src/main/java/sop/cli/picocli/commands/VersionCmd.java

@@ -14,6 +14,19 @@ import sop.operation.Version;
         exitCodeOnInvalidInput = 37)
 public class VersionCmd implements Runnable {
 
+    @CommandLine.ArgGroup()
+    Exclusive exclusive;
+
+    static class Exclusive {
+        @CommandLine.Option(names = "--extended", description = "Print an extended version string.")
+        boolean extended;
+
+        @CommandLine.Option(names = "--backend", description = "Print information about the cryptographic backend.")
+        boolean backend;
+    }
+
+
+
     @Override
     public void run() {
         Version version = SopCLI.getSop().version();
@@ -21,6 +34,19 @@ public class VersionCmd implements Runnable {
             throw new SOPGPException.UnsupportedSubcommand("Command 'version' not implemented.");
         }
 
-        Print.outln(version.getName() + " " + version.getVersion());
+        if (exclusive == null) {
+            Print.outln(version.getName() + " " + version.getVersion());
+            return;
+        }
+
+        if (exclusive.extended) {
+            Print.outln(version.getExtendedVersion());
+            return;
+        }
+
+        if (exclusive.backend) {
+            Print.outln(version.getBackendVersion());
+            return;
+        }
     }
 }