[Issue #75] Add support for field/case renames via flags

ducktape/src/main/scala/io/github/arainko/ducktape/Case.scala

@@ -25,6 +25,12 @@ object Case {
   @compileTimeOnly("Case.computed is only useable as a case configuration for transformations")
   def computed[A, B, SourceTpe, DestTpe](selector: Selector ?=> A => SourceTpe, function: SourceTpe => DestTpe): Case[A, B] = ???
 
+  @compileTimeOnly("Case.modifySourceNames is only useable as a case configuration for transformations")
+  def modifySourceNames[A, B](renamer: Renamer => Renamer): Case[A, B] & Regional[A] & Local[A] & TypeSpecific = ???
+
+  @compileTimeOnly("Case.modifyDestNames is only useable as a case configuration for transformations")
+  def modifyDestNames[A, B](renamer: Renamer => Renamer): Case[A, B] & Regional[B] & Local[B] & TypeSpecific = ???
+
   @deprecated(
     message = "Use the variant that accepts a path selector instead (Case.const(_.at[SourceSubtype], ...))",
     since = "ducktape 0.2.0-M1"

ducktape/src/main/scala/io/github/arainko/ducktape/Field.scala

@@ -53,10 +53,10 @@ object Field {
   def default[A, B, FieldType](selector: Selector ?=> B => FieldType): Field[A, B] = ???
 
   @compileTimeOnly("Field.fallbackToNone is only useable as a field configuration for transformations")
-  def fallbackToNone[A, B]: Field[A, B] & Regional = ???
+  def fallbackToNone[A, B]: Field[A, B] & Regional[B] = ???
 
   @compileTimeOnly("Field.fallbackToDefault is only useable as a field configuration for transformations")
-  def fallbackToDefault[A, B]: Field[A, B] & Regional = ???
+  def fallbackToDefault[A, B]: Field[A, B] & Regional[B] = ???
 
   @compileTimeOnly("Field.allMatching is only useable as a field configuration for transformations")
   def allMatching[A, B, DestFieldTpe, ProductTpe](selector: Selector ?=> B => DestFieldTpe, product: ProductTpe): Field[A, B] =
@@ -65,4 +65,10 @@ object Field {
   @compileTimeOnly("Field.allMatching is only useable as a field configuration for transformations")
   def allMatching[A, B, ProductTpe](product: ProductTpe): Field[A, B] =
     ???
+
+  @compileTimeOnly("Field.modifyDestNames is only useable as a field configuration for transformations")
+  def modifyDestNames[A, B](renamer: Renamer => Renamer): Field[A, B] & Regional[B] & Local[B] & TypeSpecific = ???
+
+  @compileTimeOnly("Field.modifySourceNames is only useable as a field configuration for transformations")
+  def modifySourceNames[A, B](renamer: Renamer => Renamer): Field[A, B] & Regional[A] & Local[A] & TypeSpecific = ???
 }

ducktape/src/main/scala/io/github/arainko/ducktape/Regional.scala

@@ -2,11 +2,29 @@ package io.github.arainko.ducktape
 
 import scala.annotation.compileTimeOnly
 
-type Regional
+type Regional[A]
 
 object Regional {
-  extension [F[a, b] <: (Case[b, a] | Field[a, b]), A, B](self: F[A, B] & Regional) {
+  extension [F[a, b] <: (Case[a, b] | Field[a, b]), A, B, C](self: F[A, B] & Regional[C]) {
     @compileTimeOnly(".regional is only usable as field configuration for transformations")
-    def regional[DestFieldTpe](selector: Selector ?=> B => DestFieldTpe): F[A, B] = ???
+    def regional[DestFieldTpe](selector: Selector ?=> C => DestFieldTpe): F[A, B] = ???
+  }
+}
+
+type Local[A]
+
+object Local {
+  extension [F[a, b] <: (Case[a, b] | Field[a, b]), A, B, C](self: F[A, B] & Local[C]) {
+    @compileTimeOnly(".local is only usable as field configuration for transformations")
+    def local[DestFieldTpe](selector: Selector ?=> C => DestFieldTpe): F[A, B] = ???
+  }
+}
+
+type TypeSpecific
+
+object TypeSpecific {
+  extension [F[a, b] <: (Case[a, b] | Field[a, b]), A, B](self: F[A, B] & TypeSpecific) {
+    @compileTimeOnly(".typeSpecific is only usable as field configuration for transformations")
+    def typeSpecific[Tpe]: F[A, B] = ???
   }
 }

ducktape/src/main/scala/io/github/arainko/ducktape/Renamer.scala

@@ -0,0 +1,13 @@
+package io.github.arainko.ducktape
+
+sealed trait Renamer {
+  def toUpperCase: Renamer
+
+  def toLowerCase: Renamer
+
+  def rename(from: String, to: String): Renamer
+
+  def replace(target: String, replacement: String): Renamer
+
+  def regexReplace(pattern: String, replacement: String): Renamer
+}