Command Builder

CommandBuilder.kt

package com.example.mylibrary

/** CommandBuilderBase contains options common for D8 and R8. */
abstract class CommandBuilderBase {
    internal var minApi: Int = 0
    internal var inputs: MutableList<String> = mutableListOf()

    abstract fun getCommandName(): String
    abstract fun getExtraArgs(): String

    fun build(): String {
        val inputArgs = inputs.joinToString(separator = " ")
        return "${getCommandName()} --min-api=$minApi $inputArgs ${getExtraArgs()}"
    }
}

fun <T : CommandBuilderBase> T.setMinApi(api: Int): T {
    minApi = api
    return this
}

fun <T : CommandBuilderBase> T.addInput(input: String): T {
    inputs.add(input)
    return this
}