Provide better compatibility with old version

Author: chbloemer

src/main/java/de/neuland/pug4j/Pug4J.java

@@ -1,9 +1,6 @@
 package de.neuland.pug4j;
 
 import de.neuland.pug4j.exceptions.PugCompilerException;
-import de.neuland.pug4j.model.PugModel;
-import de.neuland.pug4j.parser.Parser;
-import de.neuland.pug4j.parser.node.Node;
 import de.neuland.pug4j.template.FileTemplateLoader;
 import de.neuland.pug4j.template.PugTemplate;
 import de.neuland.pug4j.template.ReaderTemplateLoader;

src/main/java/de/neuland/pug4j/PugConfiguration.java

@@ -88,10 +88,10 @@ public PugConfiguration() {
   /**
    * Gets or creates the PugEngine instance. This method lazily initializes the engine
    * on first use and returns the cached instance on subsequent calls.
-   * 
+   *
    * @return the PugEngine instance
    */
-  private PugEngine getOrCreateEngine() {
+  public PugEngine getOrCreateEngine() {
     if (engine == null) {
       engine = PugEngine.builder()
           .templateLoader(templateLoader)

src/main/java/de/neuland/pug4j/template/PugTemplate.java

@@ -1,9 +1,17 @@
 package de.neuland.pug4j.template;
 
 import de.neuland.pug4j.Pug4J.Mode;
+import de.neuland.pug4j.PugConfiguration;
+import de.neuland.pug4j.PugEngine;
+import de.neuland.pug4j.RenderContext;
+import de.neuland.pug4j.compiler.Compiler;
+import de.neuland.pug4j.exceptions.PugCompilerException;
+import de.neuland.pug4j.model.PugModel;
 import de.neuland.pug4j.parser.node.DoctypeNode;
 import de.neuland.pug4j.parser.node.Node;
+import java.io.Writer;
 
+@SuppressWarnings({"deprecation", "removal"})
 public class PugTemplate {
 
   private Node rootNode;
@@ -46,4 +54,27 @@ private void setDoctype(String name) {
     this.terse = "html".equals(name);
     this.xml = "xml".equals(name);
   }
+
+  /**
+   * Deprecated in favor of rendering via PugEngine/RenderContext.
+   *
+   * @deprecated Since 3.0.0, forRemoval = true. Use PugEngine#render instead.
+   */
+  @Deprecated(since = "3.0.0", forRemoval = true)
+  @SuppressWarnings("deprecation")
+  public void process(PugModel model, Writer writer, PugConfiguration pugConfiguration)
+      throws PugCompilerException {
+    // Bridge deprecated PugConfiguration to the new rendering pipeline
+    PugEngine engine = pugConfiguration.getOrCreateEngine();
+
+    RenderContext context =
+        RenderContext.builder()
+            .prettyPrint(pugConfiguration.isPrettyPrint())
+            .defaultMode(pugConfiguration.getMode())
+            .globalVariables(pugConfiguration.getSharedVariables())
+            .build();
+
+    Compiler compiler = new Compiler(this, context, engine);
+    compiler.compile(model, writer);
+  }
 }