Add info metadata CLI sub-command

docs/concepts/metadata.md

@@ -27,6 +27,8 @@ Enola uses Metadata about all of its _Things_ when rendering them:
 * image of a logo; e.g. from [favicon](https://de.wikipedia.org/wiki/Favicon) or something like that; or an 😃 Emoji!
 * curie is a compact URI; a shorter form of the original "long" IRI of the Thing.
 
+[The `info metadata` sub-command](../use/info/index.md) is a handy tool to test this.
+
 <!-- The following documents the dev.enola.thing.metadata.ThingMetadataProvider service; keep it updated, if it ever changes. -->
 
 ## Label

docs/use/info/index.md

@@ -41,6 +41,15 @@ $ ./enola info detect --file-scheme picasso.thing.yaml
 
 Note that this file does not exist, this is fine; the type of its content is determine by the extension (in this case).
 
+## Metadata
+
+```bash cd ../.././..
+$ ./enola info metadata --load=test/metadata-label-property.ttl https://example.org/test-metadata-label-property
+...
+```
+
+[Metadata](../../concepts/metadata.md) explains what this is about.
+
 ## Screencast
 
 ![Demo](script.svg)

java/dev/enola/cli/InfoCommand.java

@@ -22,5 +22,5 @@
 @Command(
         name = "info",
         description = "Provides various information",
-        subcommands = {ExtensionsInfoCommand.class, DetectCommand.class})
+        subcommands = {ExtensionsInfoCommand.class, DetectCommand.class, MetadataCommand.class})
 public class InfoCommand {}

java/dev/enola/cli/MetadataCommand.java

@@ -0,0 +1,38 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright 2024 The Enola <https://enola.dev> Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package dev.enola.cli;
+
+import dev.enola.core.proto.EnolaServiceGrpc;
+import dev.enola.web.EnolaThingProvider;
+
+import picocli.CommandLine;
+
+@CommandLine.Command(name = "metadata", description = "Provides metadata for a given IRI")
+public class MetadataCommand extends CommandWithModel {
+
+    @CommandLine.Parameters(index = "0", paramLabel = "iri", description = "IRI")
+    String iri;
+
+    @Override
+    protected void run(EnolaServiceGrpc.EnolaServiceBlockingStub service) throws Exception {
+        var mdp = getMetadataProvider(new EnolaThingProvider(service));
+
+        var metadata = mdp.get(iri);
+        spec.commandLine().getOut().println(metadata);
+    }
+}

java/dev/enola/thing/metadata/ThingMetadataProviderTest.java

@@ -39,16 +39,12 @@ public class ThingMetadataProviderTest {
     private final String THING_LABEL = "DaThang!";
 
     private final ThingProvider test =
-            new ThingProvider() {
-
-                @Override
-                public @Nullable Thing get(String iri) {
-                    var builder = ImmutableThing.builder();
-                    builder.set(KIRI.SCHEMA.NAME, THING_LABEL);
-                    builder.set(KIRI.DC.DESCRIPTION, "...");
-                    builder.iri(THING_IRI);
-                    return builder.build();
-                }
+            iri -> {
+                var builder = ImmutableThing.builder();
+                builder.set(KIRI.SCHEMA.NAME, THING_LABEL);
+                builder.set(KIRI.DC.DESCRIPTION, "...");
+                builder.iri(THING_IRI);
+                return builder.build();
             };
 
     private final ThingProvider error =

test/metadata-label-property.ttl

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: Apache-2.0
+#
+# Copyright 2024 The Enola <https://enola.dev> Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+@prefix enola:   <https://enola.dev/>.
+@prefix example: <https://example.org/>.
+@prefix rdfs:    <http://www.w3.org/2000/01/rdf-schema#>.
+
+example:test-metadata-label-property-class a rdfs:Class;
+  enola:label-property enola:altlab.
+
+example:test-metadata-label-property a example:test-metadata-label-property-class;
+  enola:altlab "LABEL".