Support KSP2 (#4)

* Small change to make Enum interpretation compatible with the KSP2
runtime
* Add integration tests for KSP2
* Make KSP dependencies compileOnly

Author: ogolberg

eventbus-index-ksp-processor/build.gradle.kts

@@ -1,13 +1,13 @@
 plugins {
     `kotlin-conventions`
     `publishing-conventions`
-    alias(libs.plugins.ksp)
+    alias(libs.plugins.ksp1)
 }
 
 dependencies {
     ksp(libs.autoservice.ksp)
-    implementation(libs.ksp.api)
-    implementation(libs.autoservice.annotations)
+    compileOnly(libs.ksp.api)
+    compileOnly(libs.autoservice.annotations)
     implementation(libs.kotlinPoet)
     implementation(libs.kotlinPoetKsp)
 }

eventbus-index-ksp-processor/src/main/kotlin/com/toasttab/eventbus/ksp/Parser.kt

@@ -30,8 +30,14 @@ private fun parseSubscribeAnnotation(annotation: KSAnnotation): MaybeSubscribeAn
 
     val threadMode = args["threadMode"]
 
-    if (threadMode !is KSType) {
-        return InvalidSubscribeAnnotation("@Subscribe.threadMode = $threadMode is not an enum value")
+    val threadModelEnumValue = if (threadMode is KSType) {
+        // KSP1
+        threadMode.toClassName()
+    } else if (threadMode is KSClassDeclaration) {
+        // KSP2
+        threadMode.toClassName()
+    } else {
+        return InvalidSubscribeAnnotation("@Subscribe.threadMode = $threadMode is not a valid enum value")
     }
 
     val sticky = args["sticky"]
@@ -46,7 +52,7 @@ private fun parseSubscribeAnnotation(annotation: KSAnnotation): MaybeSubscribeAn
         return InvalidSubscribeAnnotation("@Subscribe.priority = $priority is not an Int value")
     }
 
-    return SubscribeAnnotation(threadMode.toClassName(), sticky, priority)
+    return SubscribeAnnotation(threadModelEnumValue, sticky, priority)
 }
 
 private fun KSAnnotated.subscriberAnnotation() = annotations.find {

gradle/libs.versions.toml

@@ -10,7 +10,8 @@ kotlinPoet = "2.1.0"
 
 eventbus = "3.3.1"
 
-ksp = "2.1.20-1.0.32"
+ksp1 = "2.1.20-1.0.32"
+ksp2 = "2.1.20-2.0.0"
 autoservice-ksp = "1.2.0"
 
 # test
@@ -26,7 +27,7 @@ autoservice = { module = "com.google.auto.service:auto-service", version.ref = "
 kotlinPoet = { module = "com.squareup:kotlinpoet", version.ref = "kotlinPoet" }
 kotlinPoetKsp = { module = "com.squareup:kotlinpoet-ksp", version.ref = "kotlinPoet" }
 
-ksp-api = { module = "com.google.devtools.ksp:symbol-processing-api", version.ref = "ksp" }
+ksp-api = { module = "com.google.devtools.ksp:symbol-processing-api", version.ref = "ksp1" }
 
 # ksp
 autoservice-ksp = { module = "dev.zacsweers.autoservice:auto-service-ksp", version.ref = "autoservice-ksp"}
@@ -42,4 +43,5 @@ junit-launcher = { module = "org.junit.platform:junit-platform-launcher"}
 strikt-core = { module = "io.strikt:strikt-core", version.ref = "strikt" }
 
 [plugins]
-ksp = { id = "com.google.devtools.ksp", version.ref = "ksp"}
+ksp1 = { id = "com.google.devtools.ksp", version.ref = "ksp1"}
+ksp2 = { id = "com.google.devtools.ksp", version.ref = "ksp2"}

integration-tests/common/build.gradle.kts

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Toast Inc.
+ *
+ * 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
+ * http://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.
+ */
+
+plugins {
+    `kotlin-conventions`
+}
+
+dependencies {
+    implementation(libs.eventbus)
+}

integration-tests/src/main/java/org/greenrobot/eventbus/SubscriberMethodDescriptor.kt renamed to integration-tests/common/src/main/kotlin/org/greenrobot/eventbus/SubscriberMethodDescriptor.kt

@@ -15,7 +15,7 @@
 
 plugins {
     `kotlin-conventions`
-    alias(libs.plugins.ksp)
+    alias(libs.plugins.ksp1)
 }
 
 ksp {
@@ -24,5 +24,6 @@ ksp {
 
 dependencies {
     ksp(project(":eventbus-index-ksp-processor"))
+    implementation(project(":integration-tests:common"))
     implementation(libs.eventbus)
 }