Engine param in maven plugin. (#2881)

Author: azizamaan

modules/openapi-generator-maven-plugin/src/main/java/org/openapitools/codegen/plugin/CodeGenMojo.java

@@ -126,6 +126,12 @@ public class CodeGenMojo extends AbstractMojo {
     @Parameter(name = "templateDirectory")
     private File templateDirectory;
 
+    /**
+     * The name of templating engine to use, "mustache" (default) or "handlebars" (beta)
+     */
+    @Parameter(name = "engine", defaultValue = "mustache")
+    private String engine;
+
     /**
      * Adds authorization headers when fetching the swagger definitions remotely. " Pass in a
      * URL-encoded string of name:header with a comma separating multiple values
@@ -550,6 +556,10 @@ public void execute() throws MojoExecutionException {
                 configurator.setTemplateDir(templateDirectory.getAbsolutePath());
             }
 
+            if (null != engine) {
+                configurator.setTemplatingEngineName(engine);
+            }
+
             // Set generation options
             if (null != generateApis && generateApis) {
                 GeneratorProperties.setProperty(CodegenConstants.APIS, "");