Tried with JTE but it requires access to the classpath to author templates.

parser/pom.xml

@@ -23,6 +23,11 @@
             <artifactId>picocli</artifactId>
             <version>4.7.6</version>
         </dependency>
+        <dependency>
+            <groupId>gg.jte</groupId>
+            <artifactId>jte</artifactId>
+            <version>3.2.0</version>
+        </dependency>
     </dependencies>
     <build>
         <plugins>

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

@@ -14,7 +14,7 @@ public class ParserWrapper {
         var ins = CharStreams.fromPath(sourcePath, StandardCharsets.UTF_8);
         EndpointsLexer lexer = new EndpointsLexer(ins);
         EndpointsParser parser = new EndpointsParser(new CommonTokenStream(lexer));
-		var document= parser.document() ;
+        var document = parser.document();
         var astTransformer = new EndpointsVisitorTransformer();
         astTransformer.visit(document);
         return new DocumentNode(astTransformer.getConfig(), astTransformer.getDataTypes(), astTransformer.getEndpoints());

parser/src/main/java/nu/zoom/dsl/cli/EndpointsCLI.java

@@ -2,6 +2,7 @@ package nu.zoom.dsl.cli;
 
 import nu.zoom.dsl.ast.DocumentNode;
 import nu.zoom.dsl.ast.ParserWrapper;
+import nu.zoom.dsl.jte.Generator;
 import picocli.CommandLine;
 import picocli.CommandLine.Command;
 import picocli.CommandLine.Option;
@@ -11,6 +12,7 @@ import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.List;
 import java.util.concurrent.Callable;
 
 @Command(
@@ -47,7 +49,11 @@ public class EndpointsCLI implements Callable<Integer> {
 			validateInputFile();
 			validateOutputDirectory();
 			DocumentNode rootNode = ParserWrapper.parse(file);
-			System.out.println(rootNode);
+			Generator generator = new Generator(templateDir, rootNode, outputDir);
+			List<Path> generatedPaths = generator.generate();
+			if (generatedPaths.isEmpty()) {
+				System.out.println("No generated paths found.");
+			}
 			return 0;
 		} catch (Exception e) {
 			System.err.println(e.getMessage());

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

@@ -0,0 +1,45 @@
+package nu.zoom.dsl.jte;
+
+import gg.jte.CodeResolver;
+import gg.jte.ContentType;
+import gg.jte.TemplateEngine;
+import gg.jte.TemplateOutput;
+import gg.jte.output.FileOutput;
+import gg.jte.resolve.DirectoryCodeResolver;
+import nu.zoom.dsl.ast.DocumentNode;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class Generator {
+    private final Path templatesDir ;
+    private final DocumentNode data;
+    private final Path outputDir ;
+    private final TemplateEngine templateEngine;
+
+    public Generator(Path templatesDir, DocumentNode data, Path outputDir) {
+        this.templatesDir = Objects.requireNonNull(templatesDir);
+        this.data = Objects.requireNonNull(data);
+        this.outputDir = Objects.requireNonNull(outputDir);
+        this.templateEngine = TemplateEngine.create(
+                new DirectoryCodeResolver(templatesDir),
+                ContentType.Plain
+        );
+    }
+
+    public List<Path> generate() throws IOException {
+        List<Path> templates = Files.list(templatesDir).filter(p -> p.toString().endsWith(".jte")).toList() ;
+        ArrayList<Path> out = new ArrayList<>();
+        for (Path template : templates) {
+            // TODO file ending
+            Path outpath = outputDir.resolve(template.getFileName());
+            this.templateEngine.render(template.getFileName().toString(), this.data, new FileOutput(outpath));
+            out.add(outpath);
+        }
+        return out ;
+    }
+}