The use of scalafix as a source generator is documented in olafurpg/scalafix-codegen. Since we need to produce SemanticDB for the data class source, but we want to avoid infinite loop of generation, we need to split data classes into another subproject.
ThisBuild / scalaVersion := "3.1.3"
ThisBuild / version := "0.1.0-SNAPSHOT"
ThisBuild / semanticdbEnabled := true
def dataclassScalafixV = "VERSION-FROM-BADGE"
ThisBuild / scalafixDependencies += "net.hamnaberg" %% "dataclass-scalafix" % dataclassScalafixV
def dataclassGen(data: Reference) = Def.taskDyn {
val root = (ThisBuild / baseDirectory).value.toURI.toString
val from = (data / Compile / sourceDirectory).value
val to = (Compile / sourceManaged).value
val outFrom = from.toURI.toString.stripSuffix("/").stripPrefix(root)
val outTo = to.toURI.toString.stripSuffix("/").stripPrefix(root)
(data / Compile / compile).value
Def.task {
(data / Compile / scalafix)
.toTask(s" --rules GenerateDataClass --out-from=$outFrom --out-to=$outTo")
.value
(to ** "*.scala").get
}
}
lazy val app = project
.settings(
Compile / sourceGenerators += dataclassGen(definitions).taskValue,
)
// put data classes here
lazy val definitions = projectOptionally apply scalafmt to make it somewhat readable.
Add the following dependency to both the subprojects:
libraryDependencies += "net.hamnaberg" %% "dataclass-annotation" % "VERSION-FROM-BADGE"sbt ~tests/test
# edit rules/src/main/scala/fix/GenerateDataClass.scala