[codegen] add scala 3 keywords to collision avoidance (#1392)

* [codegen] add scala 3 keywords to collision avoidance

* testfix

* fmt

* Add changelog entry

* remove scala 3 soft keywords

* add scala3 reserved keywords to sample specs

* remove redundant unit test

---------

Co-authored-by: David Francoeur <dfrancoeur04@gmail.com>

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 0.18.8
+
+* Fix collision avoidance algorithm to cover Scala 3 keywords
+
 # 0.18.7
 
 * Added support for `@httpResponseCode` on newtypes (integer shapes that aren't exactly `smithy.api#Integer`), as well as refinements (e.g. ints with a `@range` constraint).

modules/bootstrapped/src/generated/smithy4s/example/collision/Scala3ReservedKeywords.scala

@@ -0,0 +1,22 @@
+package smithy4s.example.collision
+
+import smithy4s.Hints
+import smithy4s.Schema
+import smithy4s.ShapeId
+import smithy4s.ShapeTag
+import smithy4s.schema.Schema.struct
+
+final case class Scala3ReservedKeywords(_export: Option[String] = None, _enum: Option[String] = None)
+
+object Scala3ReservedKeywords extends ShapeTag.Companion[Scala3ReservedKeywords] {
+  val id: ShapeId = ShapeId("smithy4s.example.collision", "Scala3ReservedKeywords")
+
+  val hints: Hints = Hints.empty
+
+  implicit val schema: Schema[Scala3ReservedKeywords] = struct(
+    String.schema.optional[Scala3ReservedKeywords]("export", _._export),
+    String.schema.optional[Scala3ReservedKeywords]("enum", _._enum),
+  ){
+    Scala3ReservedKeywords.apply
+  }.withId(id).addHints(hints)
+}

modules/codegen/src/smithy4s/codegen/internals/CollisionAvoidance.scala

@@ -279,7 +279,14 @@ private[internals] object CollisionAvoidance {
     "notify",
     "notifyAll",
     "toString",
-    "wait"
+    "wait",
+
+    // scala 3 "regular" keywords
+    // https://docs.scala-lang.org/scala3/guides/migration/incompat-syntactic.html#restricted-keywords
+    "enum",
+    "export",
+    "given",
+    "then"
   )
 
   class Names() {

sampleSpecs/reservednames.smithy

@@ -141,3 +141,8 @@ enum KeywordEnum {
     implicit
     package = "class"
 }
+
+structure Scala3ReservedKeywords {
+    export: String
+    enum: String
+}