scalafix-codegen

[IJ]sbt:scalafix-codegen> out/compile
[info] Compiling 1 Scala source to /media/data/Projects/scalafix-codegen1/scalafix-codegen/in/target/scala-2.12/classes ...
[info] Done compiling.
[info] Compiling 1 Scala source to /media/data/Projects/scalafix-codegen1/scalafix-codegen/out/target/scala-2.12/classes ...
[info] Done compiling.
[success] Total time: 11 s, completed 23.07.2019 3:38:13
[IJ]sbt:scalafix-codegen> out/run
[info] Packaging /media/data/Projects/scalafix-codegen1/scalafix-codegen/out/target/scala-2.12/out_2.12-0.1.0-SNAPSHOT.jar ...
[info] Done packaging.
[info] Running A 
hi
[success] Total time: 2 s, completed 23.07.2019 3:40:45

Example how to use scalafix for code generation. Run the following command in sbt:

out/compile

• triggers a source generator that runs in/scalafix Scalafixdemo --rules=file:rules/src/main/scala/Scalafixdemo.scala --out-from=in/src/main --out-to=out/target/scala-2.12/src_managed/main
• generates a new file out/target/scala-2.12/src_managed/main/scala/foo/A.scala which is a copy of the same file from the in project with the Scalafixdemo rule applied.

To customize the transformation, implement a Scalafix rule following this tutorial here: https://scalacenter.github.io/scalafix/docs/developers/tutorial.html

Note that generating source code from manually edited code has several issues:

• goto definition and other navigation in the editor jumps to the generated source code instead of the original source code
• stack traces at runtime have line numbers from the generated source code instead of the original source code.