initial implementation

src/main/scala/org/openapitools/generator/sbt/plugin/OpenApiDiffKeys.scala

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2020 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ *
+ * 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.generator.sbt.plugin
+
+import org.openapitools.openapidiff.core.model.ChangedOpenApi
+import sbt._
+
+trait OpenApiDiffKeys {
+
+  final val openApiDiff = taskKey[ChangedOpenApi]("Compute the OpenAPI diff.")
+
+  final val openApiDiffFiles = taskKey[(File, File)]("OpenAPI specification files to diff.")
+}

src/main/scala/org/openapitools/generator/sbt/plugin/OpenApiDiffPlugin.scala

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020 OpenAPI-Generator Contributors (https://openapi-generator.tech)
+ *
+ * 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.generator.sbt.plugin
+
+import org.openapitools.openapidiff.core.OpenApiCompare
+import sbt.Def
+import sbt.plugins.JvmPlugin
+
+object OpenApiDiffPlugin extends sbt.AutoPlugin with OpenApiDiffKeys {
+  self =>
+
+  override def requires: JvmPlugin.type = sbt.plugins.JvmPlugin
+
+  override def trigger: sbt.PluginTrigger = noTrigger
+
+  object autoImport extends OpenApiDiffKeys
+
+  override lazy val projectSettings: Seq[Def.Setting[_]] = Seq(
+    openApiDiffFiles := {
+      sys.error("openApiDiffFiles is undefined. Did you forget to set it?")
+    },
+    openApiDiff := {
+      val (doc1, doc2) = openApiDiffFiles.value
+      OpenApiCompare.fromFiles(doc1, doc2)
+    }
+  )
+}

src/sbt-test/sbt-openapi-generator/simple/build.sbt

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+lazy val noop = project
+
+lazy val same = project
+  .enablePlugins(OpenApiDiffPlugin)
+  .settings(openApiDiffFiles := (file("petstore.v1.yaml"), file("petstore.v1.yaml")))
+  .settings(
+    TaskKey[Unit]("check") := {
+      if (openApiDiff.value.isDifferent) sys.error("OpenAPI specs were not the same")
+      ()
+    }
+  )
+
+lazy val incompatible = project
+  .enablePlugins(OpenApiDiffPlugin)
+  .settings(openApiDiffFiles := (file("petstore.v1.yaml"), file("petstore.v2.yaml")))
+  .settings(
+    TaskKey[Unit]("check") := {
+      if (openApiDiff.value.isCompatible) sys.error("OpenAPI specs were compatible")
+      ()
+    }
+  )