Support deprecation of input values (directive args)

Author: stuebingerb

kgraphql/src/main/kotlin/com/apurebase/kgraphql/schema/model/MutableSchemaDefinition.kt

@@ -227,6 +227,13 @@ private fun create__DirectiveDefinition() = TypeDSL(
         }
         deprecate("Use `locations`.")
     }
+    transformation(__Directive::args) { args: List<__InputValue>, includeDeprecated: Boolean? ->
+        if (includeDeprecated == true) {
+            args
+        } else {
+            args.filterNot { it.isDeprecated }
+        }
+    }
 }.toKQLObject()
 
 private fun <T> List<T>.containsAny(vararg elements: T) = elements.any { this.contains(it) }

kgraphql/src/test/kotlin/com/apurebase/kgraphql/integration/BaseSchemaTest.kt

@@ -35,7 +35,7 @@ abstract class BaseSchemaTest {
                         name
                         description
                         locations
-                        args {
+                        args(includeDeprecated: true) {
                             ...InputValue
                         }
                     }