Inject challenges input

buildSrc/src/main/kotlin/Libs.kt

@@ -19,9 +19,24 @@ object Libs {
         const val processor = "org.openjdk.jmh:jmh-generator-annprocess:1.26"
     }
 
+    object Micronaut {
+        private const val version = "2.2.0"
+        const val inject = "io.micronaut:micronaut-inject:$version"
+        const val core = "io.micronaut:micronaut-core:$version"
+        const val kotlin = "io.micronaut.kotlin:micronaut-kotlin-extension-functions:$version"
+        const val processor = "io.micronaut:micronaut-inject-java:$version"
+    }
+
+    object Slf4J {
+        const val api = "org.slf4j:slf4j-api:1.7.25"
+        const val logback = "ch.qos.logback:logback-classic:1.2.3"
+        const val kotlin = "io.github.microutils:kotlin-logging-jvm:2.0.3"
+    }
+
     object Tests {
         const val assertJ = "org.assertj:assertj-core:3.18.1"
         const val junit = "org.junit.jupiter:junit-jupiter:5.7.0"
+        const val jimfs = "com.google.jimfs:jimfs:1.1"
     }
 
 }

days/build.gradle.kts

@@ -1,7 +1,13 @@
 plugins {
     id("kotlin-convention")
+    kotlin("kapt")
 }
 
 dependencies {
     implementation(project(":utils"))
+
+    implementation(Libs.Micronaut.core)
+    implementation(Libs.Micronaut.inject)
+    implementation(Libs.Micronaut.kotlin)
+    kapt(Libs.Micronaut.processor)
 }

days/src/main/kotlin/Day01.kt

@@ -1,22 +1,30 @@
+@file:Suppress("unused")
+
 package be.vandewalleh.aoc.days
 
-import be.vandewalleh.aoc.utils.Resources
+import be.vandewalleh.aoc.utils.input.Day
+import be.vandewalleh.aoc.utils.input.Input
+import be.vandewalleh.aoc.utils.input.Lines
+import io.micronaut.context.BeanContext
+import io.micronaut.context.getBean
 
-object Day01 {
+@Day(1)
+class Day01(@Lines input: Input<IntArray>) {
+    private val items = input.value
 
-    fun part1(list: List<Int>): Int? {
-        list.forEach { a ->
-            list.forEach { b ->
+    fun part1(): Int? {
+        items.forEach { a ->
+            items.forEach { b ->
                 if (a + b == 2020) return a * b
             }
         }
         return null
     }
 
-    fun part2(list: List<Int>): Int? {
-        list.forEach { a ->
-            list.forEach { b ->
-                list.forEach { c ->
+    fun part2(): Int? {
+        items.forEach { a ->
+            items.forEach { b ->
+                items.forEach { c ->
                     if (a + b + c == 2020) return a * b * c
                 }
             }
@@ -27,7 +35,7 @@ object Day01 {
 }
 
 fun main() {
-    val input = Resources.ints("day01.txt").toList()
-    println(Day01.part1(input))
-    println(Day01.part2(input))
+    val day = BeanContext.run().getBean<Day01>()
+    println(day.part1())
+    println(day.part2())
 }

days/src/test/kotlin/Day01Test.kt

@@ -1,21 +1,22 @@
 package be.vandewalleh.aoc.days
 
-import be.vandewalleh.aoc.utils.Resources
+import io.micronaut.context.BeanContext
+import io.micronaut.context.getBean
 import org.assertj.core.api.Assertions.assertThat
 import org.junit.jupiter.api.Test
 
 class Day01Test {
 
-    private val input = Resources.ints("day01.txt").toList()
+    private val day = BeanContext.run().getBean<Day01>()
 
     @Test
     fun `part1 result`() {
-        assertThat(Day01.part1(input)).isEqualTo(32064)
+        assertThat(day.part1()).isEqualTo(32064)
     }
 
     @Test
     fun `part2 result`() {
-        assertThat(Day01.part2(input)).isEqualTo(193598720)
+        assertThat(day.part2()).isEqualTo(193598720)
     }
 
 }

utils/build.gradle.kts

@@ -1,3 +1,18 @@
 plugins {
     id("kotlin-convention")
+    kotlin("kapt")
+}
+
+dependencies {
+    implementation(Libs.Micronaut.core)
+    implementation(Libs.Micronaut.inject)
+    implementation(Libs.Micronaut.kotlin)
+    kapt(Libs.Micronaut.processor)
+
+    implementation(Libs.Slf4J.api)
+    implementation(Libs.Slf4J.kotlin)
+    runtimeOnly(Libs.Slf4J.logback)
+
+    testImplementation(Libs.Tests.jimfs)
+    kaptTest(Libs.Micronaut.processor)
 }

utils/src/main/kotlin/be/vandewalleh/aoc/utils/Index.kt

@@ -0,0 +1 @@
+package be.vandewalleh.aoc.utils

utils/src/main/kotlin/be/vandewalleh/aoc/utils/Resources.kt

@@ -1,28 +0,0 @@
-@file:Suppress("unused", "MemberVisibilityCanBePrivate")
-
-package be.vandewalleh.aoc.utils
-
-import java.nio.file.Files
-import java.nio.file.Path
-import kotlin.streams.asSequence
-
-object Resources {
-    private fun path(name: String): Path {
-        val url = if (name.startsWith('/')) javaClass.getResource(name)
-        else javaClass.getResource("/$name")
-        return Path.of(url.toURI())
-    }
-
-    private fun Path.lines() = Files.lines(this)
-        .asSequence()
-        .filter { it.isNotBlank() }
-        .map { it.trim() }
-
-    private fun Path.text() = Files.readString(this).trim()
-
-    fun text(name: String) = path(name).text()
-    fun lines(name: String) = path(name).lines()
-    fun ints(name: String) = lines(name).map { it.toInt() }
-    fun csv(name: String) = path(name).text().splitToSequence(",")
-    fun csvLong(name: String) = csv(name).map { it.toLong() }
-}

utils/src/main/kotlin/be/vandewalleh/aoc/utils/input/Annotations.kt

@@ -0,0 +1,26 @@
+@file:Suppress("unused")
+
+package be.vandewalleh.aoc.utils.input
+
+import io.micronaut.context.annotation.Prototype
+import io.micronaut.core.annotation.Introspected
+import javax.inject.Qualifier
+
+@Prototype
+@Qualifier
+@Introspected
+@Target(AnnotationTarget.CLASS)
+annotation class Day(val day: Int)
+
+@Qualifier
+@Prototype
+annotation class DayInput
+
+@DayInput
+annotation class Csv
+
+@DayInput
+annotation class Text
+
+@DayInput
+annotation class Lines

utils/src/main/kotlin/be/vandewalleh/aoc/utils/input/Input.kt

@@ -0,0 +1,7 @@
+package be.vandewalleh.aoc.utils.input
+
+/**
+ * Wrapper class so that micronaut is not confused with an other injectable
+ * container type when using an iterable / array
+ */
+data class Input<T>(val value: T)

utils/src/main/kotlin/be/vandewalleh/aoc/utils/input/InputFactory.kt

@@ -0,0 +1,76 @@
+package be.vandewalleh.aoc.utils.input
+
+import io.micronaut.context.annotation.Factory
+import io.micronaut.inject.InjectionPoint
+import kotlin.io.path.ExperimentalPathApi
+import kotlin.io.path.readLines
+import kotlin.io.path.readText
+
+/**
+ * Load challenge inputs and convert them to the appropriate format
+ *
+ * contains horrible hacks while waiting for generic support in bean injection
+ * @see [micronaut-2775](https://github.com/micronaut-projects/micronaut-core/issues/2775)
+ */
+@Factory
+@ExperimentalPathApi
+class InputFactory(private val resourceLoader: ResourceLoader) {
+
+    @Csv
+    fun csvIntArray(injectionPoint: InjectionPoint<*>): Input<IntArray> = injectionPoint
+        .read()
+        .split(",")
+        .map { it.toInt() }
+        .toIntArray()
+        .wrap()
+
+    @Lines
+    fun linesIntArray(injectionPoint: InjectionPoint<*>): Input<*> =
+        when (val param = injectionPoint.typeNameOfAnnotation<Lines>()) {
+            "int[]" -> injectionPoint
+                .lines()
+                .map { it.toInt() }
+                .toList()
+                .toIntArray()
+                .wrap()
+            "java.util.List<java.lang.String>" -> injectionPoint
+                .lines()
+                .toList()
+                .wrap()
+            else -> error("Unsupported type $param")
+        }
+
+    @Text
+    fun string(injectionPoint: InjectionPoint<*>): Input<String> =
+        injectionPoint.read().wrap()
+
+
+    private fun <T> T.wrap() = Input(this)
+
+    private inline fun <reified T : Annotation> InjectionPoint<*>.typeNameOfAnnotation() = declaringBean
+        .constructor
+        .arguments
+        .find { it.hasAnnotation<T>() }
+        ?.typeName
+        ?.removePrefix("be.vandewalleh.aoc.utils.input.Input<")
+        ?.removeSuffix(">")
+        ?: error("??")
+
+    private fun InjectionPoint<*>.path() = resourceLoader.ofDay(getDay(this))
+    private fun InjectionPoint<*>.read() = path().readText().trim()
+    private fun InjectionPoint<*>.lines() = path().readLines()
+        .asSequence()
+        .filter { it.isNotBlank() }
+
+    private fun getDay(injectionPoint: InjectionPoint<*>): Int {
+        val dayAnnotation = injectionPoint
+            .declaringBean
+            .findAnnotation<Day>()
+
+        if (dayAnnotation.isEmpty)
+            error("@DayInput cannot only be used on classes annotated with ${Day::class.qualifiedName}")
+
+        return dayAnnotation.get().intValue("day").asInt
+    }
+
+}

utils/src/main/kotlin/be/vandewalleh/aoc/utils/input/MicronautExtensions.kt

@@ -0,0 +1,19 @@
+package be.vandewalleh.aoc.utils.input
+
+import io.micronaut.core.annotation.AnnotationMetadataDelegate
+import io.micronaut.core.annotation.AnnotationMetadataProvider
+import io.micronaut.core.annotation.AnnotationValue
+import io.micronaut.core.beans.BeanIntrospection
+import java.util.*
+
+internal inline fun <reified T> getIntrospection(): BeanIntrospection<T> =
+    BeanIntrospection.getIntrospection(T::class.java)
+
+internal inline fun <reified T : Annotation> AnnotationMetadataDelegate.getAnnotation(): AnnotationValue<T>? =
+    getAnnotation(T::class.java)
+
+internal inline fun <reified T : Annotation> AnnotationMetadataProvider.findAnnotation(): Optional<AnnotationValue<T>> =
+    findAnnotation(T::class.java)
+
+internal inline fun <reified T : Annotation> AnnotationMetadataProvider.hasAnnotation(): Boolean =
+    findAnnotation(T::class.java).isPresent

utils/src/main/kotlin/be/vandewalleh/aoc/utils/input/ResourceLoader.kt

@@ -0,0 +1,21 @@
+package be.vandewalleh.aoc.utils.input
+
+import java.nio.file.Path
+import javax.inject.Singleton
+
+interface ResourceLoader {
+    fun ofDay(day: Int): Path
+}
+
+@Singleton
+class ResourceLoaderImpl : ResourceLoader {
+    override fun ofDay(day: Int): Path {
+        val resourcePath = buildString {
+            append("/day")
+            append(day.toString().padStart(2, '0'))
+            append(".txt")
+        }
+        val url = javaClass.getResource(resourcePath)
+        return Path.of(url.toURI())
+    }
+}

utils/src/main/resources/logback.xml

@@ -0,0 +1,14 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <withJansi>true</withJansi>
+        <encoder>
+            <pattern>%cyan(%d{YYYY-MM-dd HH:mm:ss.SSS}) [%thread] %highlight(%-5level) %green(%logger{36}) - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="io.micronaut" level="INFO"/>
+    <logger name="io.micronaut.context.lifecycle" level="INFO"/>
+</configuration>

utils/src/test/kotlin/Index.kt

@@ -0,0 +1 @@
+package be.vandewalleh.aoc.utils

utils/src/test/kotlin/input/DayTest.kt

@@ -0,0 +1,84 @@
+package be.vandewalleh.aoc.utils.input
+
+import com.google.common.jimfs.Jimfs
+import io.micronaut.context.BeanContext
+import io.micronaut.context.annotation.Replaces
+import io.micronaut.context.getBean
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.jupiter.api.Test
+import javax.inject.Singleton
+import kotlin.io.path.ExperimentalPathApi
+import kotlin.io.path.writeText
+
+class DayTest {
+
+    @Singleton
+    @Replaces(ResourceLoaderImpl::class)
+    @ExperimentalPathApi
+    class FakeResourceLoader : ResourceLoader {
+        private val inMemoryFs = Jimfs.newFileSystem().apply {
+            getPath("1").writeText("blablabla")
+            getPath("2").writeText("1,+2,3,4,-5")
+            getPath("3")
+                .writeText(
+                    """
+                    1779
+                    1737
+                    1537
+                    1167
+                    1804
+                    1873
+                    """.trimIndent()
+                )
+            getPath("4")
+                .also { println(it) }
+                .writeText(
+                    """
+                    a
+                    bb
+                    ccc
+                    """.trimIndent()
+                )
+        }
+        override fun ofDay(day: Int) = inMemoryFs.getPath(day.toString())
+    }
+
+    @Day(1)
+    class TextStringExample(@Text val input: Input<String>)
+
+    @Day(2)
+    class CsvIntArrayExample(@Csv val input: Input<IntArray>)
+
+    @Day(3)
+    class IntLinesExample(@Lines val input: Input<IntArray>)
+
+    @Day(4)
+    class StringLinesExample(@Lines val input: Input<List<String>>)
+
+    private inline fun <reified T> createDay() = BeanContext.run().getBean<T>()
+
+    @Test
+    fun `check @Text String`() {
+        val day = createDay<TextStringExample>()
+        assertThat(day.input.value).isEqualTo("blablabla")
+    }
+
+    @Test
+    fun `check @Csv IntArray`() {
+        val day = createDay<CsvIntArrayExample>()
+        assertThat(day.input.value).containsExactly(1, +2, 3, 4, -5)
+    }
+
+    @Test
+    fun `check @Lines IntArray`() {
+        val day = createDay<IntLinesExample>()
+        assertThat(day.input.value).containsExactly(1779, 1737, 1537, 1167, 1804, 1873)
+    }
+
+    @Test
+    fun `check @Lines strings`() {
+        val day = createDay<StringLinesExample>()
+        assertThat(day.input.value).containsExactly("a", "bb", "ccc")
+    }
+
+}

utils/src/test/resources/junit-platform.properties

@@ -0,0 +1,4 @@
+junit.jupiter.testinstance.lifecycle.default=per_class
+junit.jupiter.execution.parallel.enabled=true
+junit.jupiter.execution.parallel.mode.default=same_thread
+junit.jupiter.execution.parallel.mode.classes.default=concurrent