Custom Koshry rule to avoid adding new JPG files to your git repo and ask the pull request author to use WebP instead.

NoJpgRule.kt

import io.github.tarek360.rules.core.Issue
import io.github.tarek360.rules.core.Level
import io.github.tarek360.rules.core.Report
import io.github.tarek360.rules.core.Rule

class NoJpgRule : Rule() {

  override fun run(): Report? {

    val report = Report(msgTitle = "No more JPG files, Use WebP.")

    gitDiff.getAddedFiles().forEach { file ->
      if (file.path.endsWith(".jpg")) {
        report.issues.add(Issue(msg = "File: ${file.path}", level = Level.ERROR()))
      }
    }

    return report.takeIf {
      report.issues.isNotEmpty()
    }
  }

}