Day 1: Historian Hysteria

.gitattributes

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+# generated by Gradle Wrapper
+kt/gradlew linguist-generated
+kt/gradlew.bat linguist-generated
+
+# generated by Kotlin/JS
+kt/kotlin-js-store/yarn.lock

.github/workflows/kt-bench.yml

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+name: Kotlin benchmarks
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  get-inputs:
+    uses: ephemient/aoc2024/.github/workflows/get-inputs.yml@main
+    secrets:
+      SESSION: ${{ secrets.SESSION }}
+
+  jmh-visualizer:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          repository: jzillmann/jmh-visualizer
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18
+          cache: npm
+      - run: npm install
+      - run: npm run providedZip
+        env:
+          NODE_OPTIONS: --openssl-legacy-provider
+      - uses: actions/upload-artifact@v4
+        with:
+          name: jmh-visualizer
+          path: jmh-visualizer.zip
+
+  assemble:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - uses: gradle/actions/setup-gradle@v4
+      - run: ./gradlew assembleBenchmarks
+        working-directory: kt
+
+  build:
+    needs: [ assemble, get-inputs ]
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [ jvm, js, linuxX64 ]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
+        with:
+          name: inputs
+          path: inputs
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - uses: gradle/actions/setup-gradle@v4
+        with:
+          cache-read-only: true
+      - run: ./gradlew ${{ matrix.target }}Benchmark
+        working-directory: kt
+        env:
+          AOC2024_DATADIR: ${{ github.workspace }}/inputs
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.target }}-benchmarks
+          path: kt/aoc2024-exe/build/reports/benchmarks
+
+  docs:
+    needs: [ jmh-visualizer, build ]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: gh-docs
+      - uses: actions/download-artifact@v4
+        with:
+          name: jmh-visualizer
+      - uses: actions/download-artifact@v4
+        with:
+          name: jvm-benchmarks
+          path: benchmarks
+      - uses: actions/download-artifact@v4
+        with:
+          name: js-benchmarks
+          path: benchmarks
+      - uses: actions/download-artifact@v4
+        with:
+          name: linuxX64-benchmarks
+          path: benchmarks
+      - run: rm -rf jmh-visualizer
+      - run: unzip -d jmh-visualizer jmh-visualizer.zip
+      - name: Create provided.js
+        run: |
+          shopt -s failglob
+          names=() jsonargs=()
+          for file in benchmarks/main/*/*.json; do
+            name=${file##*/}
+            name=${name%.*}
+            names+=("$name")
+            jsonargs+=(--slurpfile "$name" "$file")
+          done
+          cat >jmh-visualizer/provided.js <<EOF
+          // provided.js - generated by ${{ github.repository }}/${{ github.workflow }}, $(date +'%Y-%m-%d %H:%M:%S.%N')
+
+          var providedBenchmarks = $(jq --null-input --compact-output '$ARGS.positional|unique' --args "${names[@]}");
+
+          var providedBenchmarkStore = $(jq --null-input '$ARGS.named|map_values(.[0]|sort_by(.benchmark|[split("[.]|(?<!\\d)(?!\\D)|(?<!\\D)(?!\\d)")|map(try tonumber catch .),.]))' "${jsonargs[@]}");
+          EOF
+      - uses: EndBug/add-and-commit@v9
+        with:
+          add: jmh-visualizer
+          message: 'kotlinx.benchmark ${{ github.sha }}'

.github/workflows/kt.yml

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+name: Kotlin CI
+
+on:
+  push:
+    branches: [ main ]
+    paths: [ kt/** ]
+  pull_request:
+    branches: [ main ]
+    paths: [ kt/** ]
+
+  workflow_dispatch:
+
+jobs:
+  get-inputs:
+    uses: ephemient/aoc2024/.github/workflows/get-inputs.yml@main
+    secrets:
+      SESSION: ${{ secrets.SESSION }}
+
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - uses: gradle/actions/setup-gradle@v4
+      - run: ./gradlew build distZip
+        working-directory: kt
+      - uses: actions/upload-artifact@v4
+        with:
+          name: aoc2024-exe
+          path: kt/aoc2024-exe/build/distributions/*.zip
+      - uses: actions/upload-artifact@v4
+        with:
+          name: aoc2024-kexe
+          path: |
+            kt/aoc2024-exe/build/bin/*/debugExecutable/*.kexe
+            kt/aoc2024-exe/build/bin/*/releaseExecutable/*.kexe
+      - uses: actions/upload-artifact@v4
+        with:
+          name: aoc2024-js
+          path: kt/build/js/packages/aoc2024-aoc2024-exe/kotlin/*
+      - uses: actions/upload-artifact@v4
+        with:
+          name: aoc2024-web
+          path: kt/web/build/dist/js/productionExecutable/*
+
+  run-jvm:
+    needs: [ get-inputs, build ]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: inputs
+          path: inputs
+      - uses: actions/download-artifact@v4
+        with:
+          name: aoc2024-exe
+      - run: unzip aoc2024-exe.zip
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+      - run: aoc2024-exe/bin/aoc2024-exe
+        env:
+          AOC2024_DATADIR: inputs
+
+  run-native:
+    needs: [ get-inputs, build ]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: inputs
+          path: inputs
+      - uses: actions/download-artifact@v4
+        with:
+          name: aoc2024-kexe
+      - run: chmod +x linuxX64/*/aoc2024-exe.kexe
+      - run: linuxX64/releaseExecutable/aoc2024-exe.kexe
+        env:
+          AOC2024_DATADIR: inputs
+
+  run-node:
+    needs: [ get-inputs, build ]
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: inputs
+          path: inputs
+      - uses: actions/download-artifact@v4
+        with:
+          name: aoc2024-js
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22.0.0
+      - run: node aoc2024-aoc2024-exe.js
+        env:
+          AOC2024_DATADIR: inputs

README.md

@@ -3,6 +3,6 @@
 
 Development occurs in language-specific directories:
 
-|[Haskell](hs) ![Haskell CI](https://github.com/ephemient/aoc2024/workflows/Haskell%20CI/badge.svg)|
-|--:|
-|[Day1.hs](hs/src/Day1.hs)|
+|[Haskell](hs) ![Haskell CI](https://github.com/ephemient/aoc2024/workflows/Haskell%20CI/badge.svg)|[Kotlin](kt) ![Kotlin CI](https://github.com/ephemient/aoc2024/workflows/Kotlin%20CI/badge.svg)|
+|--:|--:|
+|[Day1.hs](hs/src/Day1.hs)|[Day1.kt](kt/aoc2024-lib/src/commonMain/kotlin/com/github/ephemient/aoc2024/Day1.kt)|

kt/.envrc

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+export AOC2024_DATADIR=$(realpath ..)

kt/.gitignore

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+.gradle/
+.kotlin/
+.idea/
+build/
+local.properties
+*~

kt/README.md

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+# [Advent of Code 2024](https://adventofcode.com/2024)
+### my answers in [Kotlin](https://www.kotlinlang.org/) ![Kotlin CI](https://github.com/ephemient/aoc2024/workflows/Kotlin%20CI/badge.svg)
+
+This project builds with [Gradle](https://gradle.org/).
+
+Run the test suite:
+
+```sh
+./gradlew :aoc2024-lib:allTests
+```
+
+Print solutions for the inputs provided in local data files:
+
+```sh
+./gradlew :aoc2024-exe:jvmRun
+```
+
+Run all checks, including [Detekt](https://detekt.github.io/) static code analysis:
+
+```sh
+./gradlew check
+```

kt/aoc2024-exe/build.gradle.kts

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+import io.gitlab.arturbosch.detekt.Detekt
+
+plugins {
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.detekt)
+}
+
+kotlin {
+    jvm {
+        mainRun {
+            mainClass = "com.github.ephemient.aoc2024.exe.Main"
+        }
+    }
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation(projects.aoc2024Lib)
+                implementation(libs.kotlinx.coroutines)
+            }
+        }
+    }
+}
+
+dependencies {
+    detektPlugins(libs.bundles.detekt.plugins)
+}

kt/aoc2024-exe/src/commonMain/kotlin/com/github/ephemient/aoc2024/exe/CommonMain.kt

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+package com.github.ephemient.aoc2024.exe
+
+import com.github.ephemient.aoc2024.days
+
+internal suspend fun mainImpl(args: Array<out String>) {
+    for (day in days) {
+        if ((args.isNotEmpty() || day.skipByDefault) && day.name !in args) continue
+        println("Day ${day.name}")
+        for (part in day.solver(getDayInput(day.day))) println(part())
+        println()
+    }
+}

kt/aoc2024-exe/src/commonMain/kotlin/com/github/ephemient/aoc2024/exe/IO.kt

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+package com.github.ephemient.aoc2024.exe
+
+internal expect fun getDayInput(day: Int): String

kt/aoc2024-exe/src/jvmMain/kotlin/com/github/ephemient/aoc2024/exe/IO.kt

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+package com.github.ephemient.aoc2024.exe
+
+import java.io.File
+
+internal actual fun getDayInput(day: Int): String =
+    File(System.getenv("AOC2024_DATADIR")?.ifEmpty { null } ?: ".", "day$day.txt").readText()

kt/aoc2024-exe/src/jvmMain/kotlin/com/github/ephemient/aoc2024/exe/JvmMain.kt

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+@file:JvmName("Main")
+
+package com.github.ephemient.aoc2024.exe
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+
+@Suppress("InjectDispatcher")
+suspend fun main(vararg args: String): Unit = withContext(Dispatchers.Default) {
+    mainImpl(args)
+}

kt/aoc2024-lib/build.gradle.kts

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+plugins {
+    alias(libs.plugins.kotlin.multiplatform)
+    alias(libs.plugins.detekt)
+}
+
+kotlin {
+    jvm()
+
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation(libs.kotlinx.coroutines)
+            }
+        }
+
+        commonTest {
+            dependencies {
+                implementation(kotlin("test"))
+                implementation(libs.kotlinx.coroutines.test)
+            }
+        }
+
+        jvmTest {
+            dependencies {
+                implementation(kotlin("test-junit5"))
+                implementation(libs.junit.jupiter.api)
+                runtimeOnly(libs.junit.jupiter.engine)
+            }
+        }
+    }
+}
+
+dependencies {
+    detektPlugins(libs.bundles.detekt.plugins)
+}
+
+tasks.withType<Test>().configureEach {
+    useJUnitPlatform()
+}