build.gradle.kts

plugins {
    kotlin("jvm") version "1.7.22"
}

repositories {
    mavenCentral()
}

tasks {
    sourceSets {
        main {
            java.srcDirs("src")
        }
    }

    wrapper {
        gradleVersion = "7.6"
    }

    task("generateNextDay") {
        doLast {
            val prevDayNum = fileTree("$projectDir/src").matching {
                include("Day*.kt")
            }.maxOf {
                val (prevDayNum) = Regex("Day(\\d\\d)").find(it.name)!!.destructured
                prevDayNum.toInt()
            }
            val newDayNum = String.format("%02d", prevDayNum + 1)
            File("$projectDir/src", "Day$newDayNum.kt").writeText(
                """
fun main() {
    fun part1(input: List<String>): Int {
        return 0
    }

    fun part2(input: List<String>): Int {
        return 0
    }

    // test if implementation meets criteria from the description, like:
    val testInput = readInput("resources/Day${newDayNum}_test")
    check(part1(testInput) == 0)

    val input = readInput("resources/Day$newDayNum")
    println(part1(input))
    println(part2(input))
}
"""
            )
        }
    }
}