webp-to-png.main.kts

// kotlin ./webp-to-png.main.kts webp-folder

@file:DependsOn("com.sksamuel.scrimage:scrimage-core:4.1.1")
@file:DependsOn("com.sksamuel.scrimage:scrimage-webp:4.1.1")

import com.sksamuel.scrimage.ImmutableImage
import com.sksamuel.scrimage.nio.PngWriter
import java.io.File
import kotlin.system.exitProcess

val folder = File(args[0])
if (!folder.exists() || !folder.isDirectory) {
    println("Invalid folder: $folder")
    exitProcess(0)
}

val files: Array<File> = folder.listFiles() ?: emptyArray()

files.filter { it.extension == "webp" }.forEach {
    val image = ImmutableImage.loader().fromFile(it)
    val pngFileName = "${it.absolutePath.removeSuffix(".webp")}.png"

    image.output(PngWriter.NoCompression, pngFileName)

    it.copyTo(folder.resolve("webp-backups/${it.name}"))
    it.delete()

    println("${it.name} -> $pngFileName")
}