AndroidX migration kotlin (KTS) script

androidx-migration-script.kts

import java.io.File
import java.nio.file.*
import java.nio.file.attribute.BasicFileAttributes


// Simple helper for AndroidX migration, written as Kotlin script
// Can be better then Android Studio migration
// But use at your own risk ;)


val PROJECT_PATH = "<YOUR_PROJECT_PATH>"

// You can download a CSV files here:
// https://developer.android.com/topic/libraries/support-library/downloads/androidx-class-mapping.csv
// https://developer.android.com/topic/libraries/support-library/downloads/androidx-artifact-mapping.csv
// Put them in your project directory
val MAPPING_CLASS_FILE = "$PROJECT_PATH/androidx-class-mapping.csv"
val MAPPING_ARTIFACT_FILE = "$PROJECT_PATH/androidx-artifact-mapping.csv"


val Path.name: String get() = fileName.toString()
val Path.extension: String get() = name.substringAfterLast('.')


println("Migrating project to AndroidX:  $PROJECT_PATH")

println("  Loading mapping file:  $MAPPING_CLASS_FILE")
val mappingClassList = File(MAPPING_CLASS_FILE).readLines().drop(1)
	.map { it.split(',', limit = 2).toTypedArray() }.toMutableList()
println("    => loaded ${mappingClassList.size} class mappings pairs")

println("  Loading mapping file:  $MAPPING_ARTIFACT_FILE")
val mappingArtifactList = File(MAPPING_ARTIFACT_FILE).readLines().drop(1)
	.map {
		val parts = it.split(',', limit = 2)
		// skip version in replacement
		arrayOf(parts[0], parts[1].substringBeforeLast(':'))
	}.toMutableList()
println("    => loaded ${mappingArtifactList.size} artifact mappings pairs")


val mapping = (mappingClassList + mappingArtifactList).toTypedArray()
var filesChecked = 0
var filesChanged = 0
Files.walkFileTree(Paths.get(PROJECT_PATH), object : SimpleFileVisitor<Path>() {
	val ignoreDirs = hashSetOf(".idea", ".gradle", ".git", "build", "_")
	val lookupExtensions = hashSetOf("kt","kts","java","xml","gradle","pro")

	override fun preVisitDirectory(filePath: Path, attributes: BasicFileAttributes): FileVisitResult {
		if (filePath.name in ignoreDirs) {
			println(">> Skipping $filePath")
			return FileVisitResult.SKIP_SUBTREE
		}
		return FileVisitResult.CONTINUE
	}

	override fun visitFile(filePath: Path, attributes: BasicFileAttributes): FileVisitResult {
		if (filePath.extension in lookupExtensions) {
			val file = filePath.toFile()

			val origContent = file.readText()
			var content = origContent
			for ((a, b) in mapping)
				content = content.replace(a, b)

			if (content != origContent) {
				file.writeText(content)
				println("> Changed $filePath")
				filesChanged++
			}

			val checked = filesChecked+1
			filesChecked = checked
			if (checked % 100 == 0)
				println("$checked files checked")
		}

		return FileVisitResult.CONTINUE
	}
})

println(">> $filesChecked files checked <<")
println(">> $filesChanged files changed <<")