Implement very basic list command

pgpainless-cert-d-cli/src/main/java/pgp/cert_d/cli/PGPCertDCli.java

@@ -12,6 +12,7 @@ import pgp.cert_d.cli.commands.Export;
 import pgp.cert_d.cli.commands.Get;
 import pgp.cert_d.cli.commands.Insert;
 import pgp.cert_d.cli.commands.Import;
+import pgp.cert_d.cli.commands.List;
 import pgp.cert_d.cli.commands.Setup;
 import pgp.cert_d.jdbc.sqlite.DatabaseSubkeyLookup;
 import pgp.cert_d.jdbc.sqlite.SqliteSubkeyLookupDaoImpl;
@@ -32,7 +33,8 @@ import java.sql.SQLException;
                 Insert.class,
                 Import.class,
                 Get.class,
-                Setup.class
+                Setup.class,
+                List.class
         }
 )
 public class PGPCertDCli {

pgpainless-cert-d-cli/src/main/java/pgp/cert_d/cli/commands/List.java

@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package pgp.cert_d.cli.commands;
+
+import pgp.cert_d.cli.PGPCertDCli;
+import pgp.certificate_store.Certificate;
+import picocli.CommandLine;
+
+import java.util.Iterator;
+
+@CommandLine.Command(name = "list",
+        resourceBundle = "msg_list"
+)
+public class List implements Runnable {
+
+    @Override
+    public void run() {
+        Iterator<Certificate> certificates = PGPCertDCli.getCertificateDirectory()
+                .getCertificates();
+        while (certificates.hasNext()) {
+            Certificate certificate = certificates.next();
+            // CHECKSTYLE:OFF
+            System.out.println(certificate.getFingerprint());
+            // CHECKSTYLE:ON
+        }
+    }
+}

pgpainless-cert-d-cli/src/main/resources/msg_list.properties

@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+#
+# SPDX-License-Identifier: Apache-2.0
+usage.header=List all certificates in the directory
+store=Overwrite the default certificate directory path
+
+# Generic TODO: Remove when bumping picocli to 4.7.0
+usage.synopsisHeading=Usage:\u0020
+usage.commandListHeading = %nCommands:%n
+usage.optionListHeading = %nOptions:%n
+usage.footerHeading=Powered by picocli%n

pgpainless-cert-d-cli/src/main/resources/msg_list_de.properties

@@ -0,0 +1,11 @@
+# SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
+#
+# SPDX-License-Identifier: Apache-2.0
+usage.header=Liste alle Zertifikate im Verzeichnis auf
+store=Überschreibe den Standardpfad des Zertifikatsverzeichnisses
+
+# Generic TODO: Remove when bumping picocli to 4.7.0
+usage.synopsisHeading=Aufruf:\u0020
+usage.commandListHeading=%nBefehle:%n
+usage.optionListHeading = %nOptionen:%n
+usage.footerHeading=Powered by Picocli%n