Add some magic

2021/src/main/kotlin/Day01.kt

@@ -3,7 +3,7 @@ package be.vandewalleh.aoc.days
 import be.vandewalleh.aoc.utils.input.Day
 import be.vandewalleh.aoc.utils.input.Lines
 
-@Day(1)
+@Day
 class Day01(@Lines val items: IntArray) {
 
     fun part1(): Int {

2021/src/main/kotlin/Main.kt

@@ -1,9 +1,5 @@
 package be.vandewalleh.aoc.days
 
-import be.vandewalleh.aoc.utils.factory.createDay
+import be.vandewalleh.aoc.utils.runDay
 
-fun main() {
+fun main() = runDay()
-    with(createDay<Day01>()) {
-        println(part2())
-    }
-}

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

@@ -0,0 +1,36 @@
+package be.vandewalleh.aoc.utils
+
+import be.vandewalleh.aoc.utils.factory.findDayDefinition
+import io.micronaut.context.BeanContext
+import java.time.LocalDate
+
+fun runDay(day: Int = LocalDate.now().dayOfMonth) {
+    val ctx = BeanContext.run()
+    val definition = ctx.findDayDefinition(day)
+
+    if (definition == null) {
+        println("Day not found")
+        return
+    }
+
+    val instance = ctx.getBean(definition)
+    val part1Handle = ctx.findExecutionHandle<Any, Any>(instance, "part1")
+    if (part1Handle.isEmpty) {
+        println("part1() not found")
+        return
+    }
+
+    println("*** Day $day ***")
+    println()
+    println("part 1:")
+    println(part1Handle.get().invoke())
+
+    println()
+    val part2Handle = ctx.findExecutionHandle<Any, Any>(instance, "part2")
+    if (part2Handle.isEmpty) {
+        println("part2() not found")
+        return
+    }
+    println("part 2:")
+    println(part2Handle.get().invoke())
+}

utils/src/main/kotlin/be/vandewalleh/aoc/utils/factory/DayFactory.kt

@@ -4,10 +4,14 @@ package be.vandewalleh.aoc.utils.factory
 
 import be.vandewalleh.aoc.utils.input.TempFileResourceLoader
 import io.micronaut.context.BeanContext
+import io.micronaut.inject.BeanDefinition
 import java.io.File
 
 fun <T> createDay(beanType: Class<T>): T = BeanContext.run().getBean(beanType)
 
+fun BeanContext.findDayDefinition(day: Int): BeanDefinition<*>? = allBeanDefinitions
+    .find { it.name == "be.vandewalleh.aoc.days.Day${day.toString().padStart(length = 2, '0')}" }
+
 inline fun <reified T> createDay() = createDay(T::class.java)
 
 // A custom resourceLoader that returns a string should be more appropriate but ¯\_(ツ)_/¯

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

@@ -2,6 +2,7 @@
 
 package be.vandewalleh.aoc.utils.input
 
+import io.micronaut.context.annotation.Executable
 import io.micronaut.context.annotation.Prototype
 import io.micronaut.core.annotation.Introspected
 import jakarta.inject.Qualifier
@@ -12,7 +13,8 @@ import java.lang.annotation.Inherited
 @Introspected
 @Target(AnnotationTarget.CLASS)
 @Retention(AnnotationRetention.RUNTIME)
-annotation class Day(val value: Int)
+@Executable
+annotation class Day(val value: Int = -1)
 
 @Qualifier
 @Prototype

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

@@ -54,7 +54,11 @@ class InputFactory(private val resourceLoader: ResourceLoader) {
         if (dayAnnotation.isEmpty)
             error("@DayInput cannot only be used on classes annotated with ${Day::class.qualifiedName}")
 
-        return dayAnnotation.get().intValue("value").asInt
+        val dayFromAnnotation = dayAnnotation.get().intValue("value").orElse(-1)
+        return if (dayFromAnnotation == -1)
+            injectionPoint.declaringBean.beanType.simpleName.replace("Day", "").toInt()
+        else
+            dayFromAnnotation
     }
 
 }