Add treatWarningsAsErrors option to ValidateTask in gradle plugin

Author: klahap

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/extensions/OpenApiGeneratorValidateExtension.kt

@@ -34,4 +34,9 @@ open class OpenApiGeneratorValidateExtension(project: Project) {
      * Whether to offer recommendations related to the validated specification document.
      */
     val recommend = project.objects.property<Boolean>().convention(true)
+
+    /**
+     * Whether to treat warnings as errors and fail the task.
+     */
+    val treatWarningsAsErrors = project.objects.property<Boolean>().convention(false)
 }

modules/openapi-generator-gradle-plugin/src/main/kotlin/org/openapitools/generator/gradle/plugin/tasks/ValidateTask.kt

@@ -60,6 +60,10 @@ open class ValidateTask : DefaultTask() {
     @Input
     val recommend = project.objects.property<Boolean>().convention(true)
 
+    @Optional
+    @Input
+    val treatWarningsAsErrors = project.objects.property<Boolean>().convention(false)
+
     @get:Internal
     @set:Option(option = "input", description = "The input specification.")
     var input: String? = null
@@ -73,6 +77,7 @@ open class ValidateTask : DefaultTask() {
 
         val spec = inputSpec.get()
         val recommendations = recommend.get()
+        val failOnWarnings = treatWarningsAsErrors.get()
 
         logger.quiet("Validating spec $spec")
 
@@ -98,6 +103,10 @@ open class ValidateTask : DefaultTask() {
                 out.println("\t${it.message}\n")
                 logger.debug("WARNING: ${it.message}|${it.details}")
             }
+
+            if (failOnWarnings) {
+                throw GradleException("Validation failed due to warnings (treatWarningsAsErrors = true).")
+            }
         }
 
         if (messages.isNotEmpty() || validationResult.errors.isNotEmpty()) {