enable to run commands from a standalone java file

README.adoc

@@ -1371,3 +1371,50 @@ Just set extension property `tomitribe.crest.useInPlaceRegistrations` to `true`:
 ----
 
 This enables to use the same scanning for both tasks and therefore to have a common and unified scanning for java and native runs.
+
+== Run commands from source
+
+There is an experimental mode in crest enabling you to write commands in a standalone `.java` and run it with `tomitribe-crest.jar` fatjar directly.
+The trick is to pass as first parameter `--crest.source=/path/to/file/with/commands.java`.
+
+[source,java]
+.commands.java
+----
+import org.tomitribe.crest.api.Command;
+import java.time.LocalDate;
+
+class Command1 {
+    @Command
+    String ok() {
+        return "ok";
+    }
+}
+
+@Command
+class Command2 {
+    @Command
+    String time() {
+        return LocalDate.now().toString();
+    }
+}
+----
+
+IMPORTANT: this mode has some limitation like not supporting (yet) a dynamic classpath so it just uses the script and the launching classpath.
+
+TIP: to ease writing scripts with completion the lines starting with `//-- ` will drop this prefix.
+It avoids compilations errors in general on classes no in the classpath (crest there).
+
+Usage example:
+
+[source,bash]
+----
+java \
+  -jar tomitribe-crest-0.20-fatjar.jar \
+  --crest.source=mycommands.java \
+  my-command \
+  --foo=bar
+----
+
+IMPORTANT: this requires to run with a *JDK* to work.
+
+TIP: you can also use it in a script easily.

tomitribe-crest-arthur-extension/src/main/java/org/tomitribe/crest/arthur/svm/MainSubstitute.java

@@ -0,0 +1,29 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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 org.tomitribe.crest.arthur.svm;
+
+import com.oracle.svm.core.annotate.Substitute;
+import com.oracle.svm.core.annotate.TargetClass;
+import org.tomitribe.crest.Main;
+
+@TargetClass(Main.class)
+public final class MainSubstitute {
+    @Substitute
+    private void handleSource(final String command) {
+        throw new UnsupportedOperationException("In native mode, compiler feature is disabled");
+    }
+}

tomitribe-crest-arthur-extension/src/main/java/org/tomitribe/crest/arthur/svm/SimpleCompilerDelete.java

@@ -0,0 +1,26 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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
+ *
+ * http://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 org.tomitribe.crest.arthur.svm;
+
+import com.oracle.svm.core.annotate.Delete;
+import com.oracle.svm.core.annotate.TargetClass;
+import org.tomitribe.crest.compiler.SimpleCompiler;
+
+@Delete("native mode will not support compilation on the fly")
+@TargetClass(SimpleCompiler.class)
+public final class SimpleCompilerDelete {
+}

tomitribe-crest/pom.xml

@@ -81,16 +81,22 @@
       <version>${project.version}</version>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>com.google.auto.service</groupId>
-      <artifactId>auto-service</artifactId>
-      <version>1.0-rc2</version>
-      <optional>true</optional>
-    </dependency>
   </dependencies>
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>default-compile</id>
+            <configuration>
+              <proc>none</proc>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
@@ -103,6 +109,42 @@
           </systemPropertyVariables>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-shade-plugin</artifactId>
+        <version>3.3.0</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>shade</goal>
+            </goals>
+            <configuration>
+              <shadedArtifactAttached>true</shadedArtifactAttached>
+              <shadedClassifierName>fatjar</shadedClassifierName>
+              <transformers>
+                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                  <mainClass>org.tomitribe.crest.Main</mainClass>
+                </transformer>
+              </transformers>
+              <artifactSet>
+                <excludes>
+                  <exclude>org.apache.xbean:*</exclude>
+                </excludes>
+              </artifactSet>
+              <filters>
+                <filter>
+                  <artifact>*:*</artifact>
+                  <excludes>
+                    <exclude>META-INF/LICENSE.txt</exclude>
+                    <exclude>META-INF/NOTICE.txt</exclude>
+                  </excludes>
+                </filter>
+              </filters>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>