Makes it possible to put templates in subdirectories

README.md

@@ -203,11 +203,12 @@ One restriction is that a state and a messages may share have the same name, i.e
 If the parser is successful it will hold the following data in the AST
 
 ```java
-public record DocumentNode(
+public record GeneratorNode(
 	Map<String, String> config,
 	Set<TypeNode> typeDefinitions,
 	List<EndpointNode> endpoints,
-        Set<StateNode> states) {
+	Set<StateNode> states,
+	Meta meta) {
 }
 ```
 
@@ -304,3 +305,14 @@ public record TransitionNode(String message, String toState) {
 ```
 * `name` is the message name.
 * `toState` is the name of the target state.
+
+### Meta
+
+The meta container holds information about the template file used to generate the output file.
+It holds the subdirectory below the given `templateDir` where the template was found.
+
+This is useful to generate e.g. java `package`statements like this:
+
+```injectedfreemarker
+<#list meta.templateDirectories>package <#items as dir>${dir}<#sep>.</#items>;</#list>
+```

endpoints-templates/endpoints.txt.ftl

@@ -1,3 +1,5 @@
+Generated from template: ${meta.templateFile}
+
 <#list endpoints as endpoint>
     <#list endpoint.paths.paths>
     <#items as segment>/${segment}</#items>

endpoints-templates/nu/zoom/dsl/Codecs.scala.ftl

@@ -11,7 +11,7 @@
 //   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 ${config.package}
+<#list meta.templateDirectories>package <#items as dir>${dir}<#sep>.</#items>;</#list>
 
 object Codecs:
 <#list typeDefinitions as type>

endpoints-templates/nu/zoom/dsl/Endpoints.scala.ftl

@@ -11,7 +11,7 @@
 //   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 ${config.package}
+<#list meta.templateDirectories>package<#items as dir>${dir}<#sep>.</#items>;</#list>
 
 class Endpoints:
 <#list endpoints as endpoint>

endpoints-templates/nu/zoom/dsl/Protocol.scala.ftl

@@ -11,7 +11,7 @@
 //   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 ${config.package}
+<#list meta.templateDirectories>package<#items as dir>${dir}<#sep>.</#items>;</#list>
 
 object Protocol:
 <#list typeDefinitions?sort as type>

parser/src/main/java/nu/zoom/dsl/ast/DocumentNode.java

@@ -13,6 +13,7 @@
 //   limitations under the License.
 package nu.zoom.dsl.ast;
 
+import java.nio.file.Path;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;

parser/src/main/java/nu/zoom/dsl/ast/GeneratorNode.java

@@ -0,0 +1,13 @@
+package nu.zoom.dsl.ast;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public record GeneratorNode(
+	Map<String, String> config,
+	Set<TypeNode> typeDefinitions,
+	List<EndpointNode> endpoints,
+	Set<StateNode> states,
+	Meta meta) {
+}

parser/src/main/java/nu/zoom/dsl/ast/Meta.java

@@ -0,0 +1,9 @@
+package nu.zoom.dsl.ast;
+
+import java.util.List;
+
+public record Meta(
+	List<String> templateDirectories,
+	String templateFile
+) {
+}

parser/src/main/java/nu/zoom/dsl/freemarker/Generator.java

@@ -18,28 +18,30 @@ import freemarker.template.Template;
 import freemarker.template.TemplateException;
 import freemarker.template.TemplateExceptionHandler;
 import nu.zoom.dsl.ast.DocumentNode;
+import nu.zoom.dsl.ast.GeneratorNode;
+import nu.zoom.dsl.ast.Meta;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
-import java.nio.file.FileVisitOption;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 public class Generator {
 	private final Path templatesDir;
-    private final DocumentNode data;
+	private final DocumentNode documentNode;
 	private final Path outputDir;
 	private final Configuration cfg;
 	private final String TEMPLATE_EXTENSION = ".ftl";
 	private final int TEMPLATE_EXTENSION_LENGTH = TEMPLATE_EXTENSION.length();
 
-    public Generator(Path templatesDir, DocumentNode data, Path outputDir) throws IOException {
+	public Generator(Path templatesDir, DocumentNode documentNode, Path outputDir) throws IOException {
 		this.templatesDir = Objects.requireNonNull(templatesDir);
-        this.data = Objects.requireNonNull(data);
+		this.documentNode = Objects.requireNonNull(documentNode);
 		this.outputDir = Objects.requireNonNull(outputDir);
 		this.cfg = new Configuration(Configuration.VERSION_2_3_34);
 		cfg.setDirectoryForTemplateLoading(templatesDir.toFile());
@@ -55,7 +57,7 @@ public class Generator {
 			List<Path> templates = files
 				.filter(p -> {
 						var fname = p.getFileName().toString();
-                        return fname.length() > TEMPLATE_EXTENSION_LENGTH && fname.endsWith(TEMPLATE_EXTENSION) ;
+						return fname.length() > TEMPLATE_EXTENSION_LENGTH && fname.endsWith(TEMPLATE_EXTENSION);
 					}
 				)
 				.map(p -> templatesDir.relativize(p))
@@ -64,9 +66,26 @@ public class Generator {
 			for (Path template : templates) {
 				Path outpath = outputDir.resolve(outputFilenameFromTemplate(template.toString()));
 				Files.createDirectories(outpath.getParent());
+				Path templateSubdirectory = template.getParent();
+				ArrayList<String> templateDirectories= new ArrayList<>() ;
+				if (templateSubdirectory != null) {
+					var ti = templateSubdirectory.iterator();
+					while (ti.hasNext()) {
+						templateDirectories.add(ti.next().toString());
+					}
+				}
+				String templateName = template.getFileName().toString();
+				Meta meta = new Meta(templateDirectories, templateName);
+				GeneratorNode generatorNode = new GeneratorNode(
+					this.documentNode.config(),
+					this.documentNode.typeDefinitions(),
+					this.documentNode.endpoints(),
+					this.documentNode.states(),
+					meta
+				);
 				Template ftl = this.cfg.getTemplate(template.toString());
 				try (var outw = Files.newBufferedWriter(outpath, StandardCharsets.UTF_8)) {
-                    ftl.process(this.data, outw);
+					ftl.process(generatorNode, outw);
 					out.add(outpath);
 				}
 			}