TransformAssetsTask.kt

/*
 * Copyright (C) 2024 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File
import org.gradle.api.DefaultTask
import org.gradle.api.tasks.TaskAction
import org.gradle.api.tasks.InputDirectory
import org.gradle.api.tasks.OutputDirectory
import org.gradle.api.file.DirectoryProperty

abstract class TransformAssetsTask: DefaultTask() {

    @get:InputDirectory
    abstract val inputDir: DirectoryProperty
    @get:OutputDirectory
    abstract val outputDir: DirectoryProperty

    @TaskAction
    fun taskAction() {
        // We must copy the contents of the input directory to the output directory before our transformation
        inputDir.get().asFile.copyRecursively(outputDir.get().asFile)

        // Transform an existing file by updating its contents
        val fileToTransform = File(outputDir.get().asFile, "FileToTransform.txt")
        val transformedContent = fileToTransform.readText().replace("initial", "transformed")
        fileToTransform.writeText(transformedContent)
    }
}