set module name to match what we have in our docs (#88)

* set module name to match what we have in our docs

refactor

* scalafmt

build.sbt

@@ -31,10 +31,8 @@ lazy val core =
     .settings(headerSettings(IntegrationTest))
     .settings(Defaults.itSettings)
     .settings(Dependencies.core)
-    .settings(
-      name := "pekko-projection-core",
-      Compile / packageBin / packageOptions += Package.ManifestAttributes(
-        "Automatic-Module-Name" -> "pekko.projection.core"))
+    .settings(AutomaticModuleName.settings("pekko.projection.core"))
+    .settings(name := "pekko-projection-core")
     .settings(Protobuf.settings)
 
 lazy val coreTest =
@@ -59,8 +57,8 @@ lazy val testkit =
     .settings(headerSettings(IntegrationTest))
     .settings(Defaults.itSettings)
     .settings(Dependencies.testKit)
-    .settings(
-      name := "pekko-projection-testkit")
+    .settings(AutomaticModuleName.settings("pekko.projection.testkit"))
+    .settings(name := "pekko-projection-testkit")
     .dependsOn(core)
 
 // provides offset storage backed by a JDBC table
@@ -72,8 +70,8 @@ lazy val jdbc =
     .settings(headerSettings(IntegrationTest))
     .settings(Defaults.itSettings)
     .settings(Dependencies.jdbc)
-    .settings(
-      name := "pekko-projection-jdbc")
+    .settings(AutomaticModuleName.settings("pekko.projection.jdbc"))
+    .settings(name := "pekko-projection-jdbc")
     .dependsOn(core)
     .dependsOn(coreTest % "test->test")
     .dependsOn(testkit % Test)
@@ -87,8 +85,8 @@ lazy val slick =
     .settings(headerSettings(IntegrationTest))
     .settings(Defaults.itSettings)
     .settings(Dependencies.slick)
-    .settings(
-      name := "pekko-projection-slick")
+    .settings(AutomaticModuleName.settings("pekko.projection.slick"))
+    .settings(name := "pekko-projection-slick")
     .dependsOn(jdbc)
     .dependsOn(core)
     .dependsOn(coreTest % "test->test")
@@ -103,8 +101,8 @@ lazy val cassandra =
     .settings(headerSettings(IntegrationTest))
     .settings(Defaults.itSettings)
     .settings(Dependencies.cassandra)
-    .settings(
-      name := "pekko-projection-cassandra")
+    .settings(AutomaticModuleName.settings("pekko.projection.cassandra"))
+    .settings(name := "pekko-projection-cassandra")
     .dependsOn(core)
     // strictly speaking it is not needed to have test->test here.
     // Cassandra module doesn't have tests, only integration tests
@@ -118,8 +116,8 @@ lazy val eventsourced =
     .enablePlugins(ReproducibleBuildsPlugin)
     .settings(crossScalaVersions := Dependencies.Scala2And3Versions)
     .settings(Dependencies.eventsourced)
-    .settings(
-      name := "pekko-projection-eventsourced")
+    .settings(AutomaticModuleName.settings("pekko.projection.eventsourced"))
+    .settings(name := "pekko-projection-eventsourced")
     .dependsOn(core)
     .dependsOn(testkit % Test)
 
@@ -129,8 +127,8 @@ lazy val kafka =
     .enablePlugins(ReproducibleBuildsPlugin)
     .settings(crossScalaVersions := Dependencies.Scala2And3Versions)
     .settings(Dependencies.kafka)
-    .settings(
-      name := "pekko-projection-kafka")
+    .settings(AutomaticModuleName.settings("pekko.projection.kafka"))
+    .settings(name := "pekko-projection-kafka")
     .dependsOn(core)
 
 lazy val kafkaTest =
@@ -155,8 +153,8 @@ lazy val `durable-state` =
     .enablePlugins(ReproducibleBuildsPlugin)
     .settings(crossScalaVersions := Dependencies.Scala2And3Versions)
     .settings(Dependencies.state)
-    .settings(
-      name := "pekko-projection-durable-state")
+    .settings(AutomaticModuleName.settings("pekko.projection.durable-state"))
+    .settings(name := "pekko-projection-durable-state")
     .dependsOn(core)
     .dependsOn(testkit % Test)
 

project/AutomaticModuleName.scala

@@ -0,0 +1,30 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * license agreements; and to You under the Apache License, version 2.0:
+ *
+ *   https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * This file is part of the Apache Pekko project, which was derived from Akka.
+ */
+
+/*
+ * Copyright (C) 2016-2022 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+import sbt.Keys._
+import sbt._
+
+/**
+ * Helper to set Automatic-Module-Name in projects.
+ *
+ * !! DO NOT BE TEMPTED INTO AUTOMATICALLY DERIVING THE NAMES FROM PROJECT NAMES !!
+ *
+ * The names carry a lot of implications and DO NOT have to always align 1:1 with the group ids or package names,
+ * though there should be of course a strong relationship between them.
+ */
+object AutomaticModuleName {
+  private val AutomaticModuleName = "Automatic-Module-Name"
+
+  def settings(name: String): Seq[Def.Setting[Task[Seq[PackageOption]]]] =
+    Seq(Compile / packageBin / packageOptions += Package.ManifestAttributes(AutomaticModuleName -> name))
+}