0.2.4

build.sc

@@ -14,7 +14,7 @@ val scala31 = "3.1.1"
 val scala2Versions = List(scala212, scala213)
 
 val scalaJSVersions = for {
-  scalaV <- scala30 :: scala2Versions
+  scalaV <- scala2Versions
   scalaJSV <- Seq("1.5.1")
 } yield (scalaV, scalaJSV)
 
@@ -84,7 +84,7 @@ trait CommonTestModule extends ScalaModule with TestModule.Utest {
 
 
 object mainargs extends Module {
-  object jvm extends Cross[JvmMainArgsModule](scala30 :: scala2Versions: _*)
+  object jvm extends Cross[JvmMainArgsModule](scala2Versions: _*)
   class JvmMainArgsModule(val crossScalaVersion: String)
     extends Common with ScalaModule with MainArgsPublishModule {
     def platform = "jvm"

mainargs/src-2/Macros.scala

@@ -96,11 +96,13 @@ class Macros(val c: Context) {
 
     val argListSymbol = q"${c.fresh[TermName](TermName("argsList"))}"
 
-    val defaults = for ((arg, i) <- flattenedArgLists.zipWithIndex) yield {
+    val defaults = for ((arg0, i) <- flattenedArgLists.zipWithIndex) yield {
       val arg = TermName(c.freshName())
-      hasDefault(i).map(defaultName =>
-        q"($arg: $curCls) => $arg.${newTermName(defaultName)}"
-      )
+      hasDefault(i) match{
+        case None => q"_root_.scala.None"
+        case Some(defaultName) =>
+          q"_root_.scala.Some[$curCls => ${arg0.info}](($arg: $curCls) => $arg.${newTermName(defaultName)}: ${arg0.info})"
+      }
     }
 
     val argSigs  = for((arg, defaultOpt) <- flattenedArgLists.zip(defaults)) yield {

mainargs/test/src/InvocationArgs.scala

@@ -0,0 +1,51 @@
+package mainargs
+import utest._
+@main
+case class LargeArgs(
+  v1: String,
+  v2: String = "v2-default",
+  v3: Option[String] = None,
+  v4: Option[String] = None,
+  v5: Int,
+  v6: Int = 0,
+  v7: Int = 123,
+  v8: Int = 3.14.toInt,
+  v9: Boolean,
+  v10: Boolean = true,
+  v11: Boolean = false,
+  v12: Option[Int] = None,
+  v13: Option[Int] = None,
+  v14: String = "v14-default",
+  v15: String = "v15-default",
+  v16: String = "v16-default",
+  v17: String = "v17-default",
+  v18: String = "v18-default",
+  v19: String = "v19-default",
+  v20: String = "v20-default",
+  v21: String = "v21-default",
+  v22: String = "v22-default",
+  v23: String = "v23-default",
+  v24: String = "v24-default",
+  v25: String = "v25-default",
+  v26: String = "v26-default",
+  v27: String = "v27-default",
+  v28: String = "v28-default",
+  v29: String = "v29-default",
+  v30: String = "v30-default",
+  v31: String = "v31-default",
+  v32: String = "v32-default",
+)
+
+object LargeClassTests extends TestSuite{
+  val largeArgsParser = ParserForClass[LargeArgs]
+
+  val tests = Tests {
+    test("simple") {
+      largeArgsParser.constructOrThrow(
+        Seq("--v1", "v1-value", "--v5", "5", "--v9", "true", "--v23", "v23-value")
+      ) ==>
+        LargeArgs(v1 = "v1-value", v5 = 5, v9 = true, v23 = "v23-value")
+    }
+  }
+}
+

readme.md

@@ -521,6 +521,11 @@ command-line friendly tool.
 
 # Changelog
 
+## 0.2.4
+
+- Backport of *Fix usage of `ParserForClass` for `case class`es with more than 
+  22 parameters with some default values in Scala 2.x (#123)* on top of 0.2.3
+
 ## 0.2.3
 
 - Support Scala 3 [#18](https://github.com/com-lihaoyi/mainargs/pull/18)