From 07b2d899d40720aa9e0ab1528eaf8e03c73ef59b Mon Sep 17 00:00:00 2001
From: themooks <jerome.saint-marc@genesys.com>
Date: Tue, 27 Oct 2026 17:43:48 +0100
Subject: [PATCH 1/2] Add GoCase lambda

---
 .../openapitools/codegen/DefaultCodegen.java  |  1 +
 .../templating/mustache/GocaseLambda.java     | 51 +++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
index 48e4794eaca6..3763d93b1e5a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/DefaultCodegen.java
@@ -378,6 +378,7 @@ protected ImmutableMap.Builder<String, Lambda> addMustacheLambdas() {
                 .put("uppercase", new UppercaseLambda())
                 .put("titlecase", new TitlecaseLambda())
                 .put("snakecase", new SnakecaseLambda())
+                .put("gocase", new GocaseLambda())
                 .put("camelcase", new CamelCaseLambda(true).generator(this))
                 .put("pascalcase", new CamelCaseLambda(false).generator(this))
                 .put("indented", new IndentedLambda())
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java
new file mode 100644
index 000000000000..19b17189ae6b
--- /dev/null
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2018 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ * Copyright 2018 SmartBear Software
+ *
+ * Licensed 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
+ *
+ *     https://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.openapitools.codegen.templating.mustache;
+
+import com.samskivert.mustache.Mustache;
+import com.samskivert.mustache.Template;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.Locale;
+
+import static org.openapitools.codegen.utils.StringUtils.underscore;
+
+/**
+ * Converts text in a fragment to snake case.
+ * <p>
+ * Register:
+ * <pre>
+ * additionalProperties.put("gocase", new GocaseLambda());
+ * </pre>
+ * <p>
+ * Use:
+ * <pre>
+ * {{#gocase}}{{summary}}{{/gocase}}
+ * </pre>
+ */
+public class GocaseLambda implements Mustache.Lambda {
+    @Override
+    public void execute(Template.Fragment fragment, Writer writer) throws IOException {
+        String text = fragment.execute().toLowerCase(Locale.ROOT);
+        if (!text.isEmpty()) {
+            text = text.substring(0, 1).toUpperCase(Locale.ROOT) + text.substring(1);
+        }
+        writer.write(text);
+    }
+}

From bb9a1081649826d57824cac86734b38080a29525 Mon Sep 17 00:00:00 2001
From: themooks <jerome.saint-marc@genesys.com>
Date: Wed, 28 Oct 2026 11:11:52 +0100
Subject: [PATCH 2/2] Remove unused import

---
 .../openapitools/codegen/templating/mustache/GocaseLambda.java  | 2 --
 1 file changed, 2 deletions(-)

diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java
index 19b17189ae6b..5380e809d97b 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/mustache/GocaseLambda.java
@@ -24,8 +24,6 @@
 import java.io.Writer;
 import java.util.Locale;
 
-import static org.openapitools.codegen.utils.StringUtils.underscore;
-
 /**
  * Converts text in a fragment to snake case.
  * <p>