[GitHub] [incubator-pekko-connectors] jtjeferreira commented on issue #23: follow up with maintainers of externally maintained alpakka connectors

["jtjeferreira (via GitHub)" <gi...@apache.org>]

jtjeferreira commented on issue #23:
URL: https://github.com/apache/incubator-pekko-connectors/issues/23#issuecomment-1533149546

   I have used the following code to use source generators and search/replace on the imports to publish the same library for akka and pekko:
   
   ```scala
   import sbt._
   
   object PekkoMigration {
     def generatePekkoSourcesFromAkka(scalaSourceDirectory: File, sourceManagedDir: File): Seq[File] = {
       val scalaFiles: PathFinder = scalaSourceDirectory ** "*.scala"
       //collect the files
       val filesToBeCopied: Seq[(File, File)] = scalaFiles.get().map { f =>
         val Some(relative) = scalaSourceDirectory.relativize(f)
         val target: File = sourceManagedDir / relative.toPath.toString
         (f, target)
       }
       //copy the files
       val copiedFiles = IO.copy(filesToBeCopied).toSeq
       //rewrite imports
       copiedFiles.map { f =>
         val modifiedLines = IO.readLines(f).map {
           case l if l.startsWith("import akka.stream.alpakka") =>
             l.replaceFirst("import akka.stream.alpakka", "import org.apache.pekko.stream.connectors")
           case l if l.startsWith("import akka") =>
             l.replaceFirst("import akka", "import org.apache.pekko")
           case l => l
         }
         IO.writeLines(f, modifiedLines)
         f
       }
     }
   }
   ```
   
   and then you can use it like this
   
   ```scala
       Compile / sourceGenerators += Def.task {
         PekkoMigration.generatePekkoSourcesFromAkka((AKKA_PROJECT / Compile / scalaSource).value, (Compile / sourceManaged).value)
       }.taskValue
   ``` 
   
   
   It is not very fancy (i.e it does not use scalafix) but gets the job done for small libs


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