From c11b84c9509084381aaab25a7fb2e82ea50d9be8 Mon Sep 17 00:00:00 2001
From: Daan Vanden Bosch <daan.v.d.bosch@gmail.com>
Date: Sun, 15 Aug 2021 16:24:47 +0200
Subject: [PATCH] Psoserv now outputs its version when starting up.

---
 psolib/build.gradle.kts                       |  9 ++--
 psoserv/build.gradle.kts                      | 51 ++++++++++++++++---
 .../kotlin/world/phantasmal/psoserv/Main.kt   |  2 +-
 3 files changed, 51 insertions(+), 11 deletions(-)

diff --git a/psolib/build.gradle.kts b/psolib/build.gradle.kts
index e2516f64..483977b3 100644
--- a/psolib/build.gradle.kts
+++ b/psolib/build.gradle.kts
@@ -14,12 +14,15 @@ buildscript {
     }
 }
 
+/** Source code generated by the build script goes here. */
+val generatedCommonSrc = File(buildDir, "generated-src/commonMain/kotlin")
+
 val serializationVersion: String by project.extra
 
 kotlin {
     sourceSets {
         commonMain {
-            kotlin.setSrcDirs(kotlin.srcDirs + file("build/generated-src/commonMain/kotlin"))
+            kotlin.setSrcDirs(kotlin.srcDirs + generatedCommonSrc)
             dependencies {
                 api(project(":core"))
                 api("org.jetbrains.kotlinx:kotlinx-serialization-core:$serializationVersion")
@@ -39,9 +42,7 @@ val generateOpcodes = tasks.register("generateOpcodes") {
 
     val packageName = "world.phantasmal.psolib.asm"
     val opcodesFile = file("srcGeneration/asm/opcodes.yml")
-    val outputFile = file(
-        "build/generated-src/commonMain/kotlin/${packageName.replace('.', '/')}/Opcodes.kt"
-    )
+    val outputFile = File(generatedCommonSrc, "${packageName.replace('.', '/')}/Opcodes.kt")
 
     inputs.file(opcodesFile)
     outputs.file(outputFile)
diff --git a/psoserv/build.gradle.kts b/psoserv/build.gradle.kts
index 1c7bb9c9..c760a964 100644
--- a/psoserv/build.gradle.kts
+++ b/psoserv/build.gradle.kts
@@ -1,4 +1,5 @@
 import org.graalvm.buildtools.gradle.tasks.BuildNativeImageTask
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 
 plugins {
     id("world.phantasmal.jvm")
@@ -7,23 +8,61 @@ plugins {
     id("org.graalvm.buildtools.native") version "0.9.2"
 }
 
+version = "0.0.1"
+
+/** Source code generated by the build script goes here. */
+val generatedSrc = File(buildDir, "generated-src/main/kotlin")
+
+kotlin {
+    sourceSets {
+        main {
+            kotlin.setSrcDirs(kotlin.srcDirs + generatedSrc)
+        }
+    }
+}
+
+val generateVersionInfo by tasks.registering {
+    group = "code generation"
+
+    val packageName = "world.phantasmal.psoserv"
+    val outputFile = File(generatedSrc, "${packageName.replace('.', '/')}/VersionInfo.kt")
+
+    inputs.property("version", version)
+    outputs.file(outputFile)
+
+    doLast {
+        outputFile.writeText("""
+            package $packageName
+
+            object VersionInfo {
+                val version: String = "$version"
+            }
+        """.trimIndent())
+    }
+}
+
+tasks.withType<KotlinCompile>().configureEach {
+    dependsOn(generateVersionInfo)
+}
+
 val mainClassFqn = "world.phantasmal.psoserv.MainKt"
-val agentOutputDir = File(buildDir, "agent-output")
+val nativeAgentOutputDir = File(buildDir, "agent-output")
 
 application {
     mainClass.set(mainClassFqn)
 }
 
 val nativeAgentRun by tasks.registering(JavaExec::class) {
-    description = "Run with the GraalVM native-image-agent to produce reflection info etc. for the nativeBuild task."
+    description =
+        "Run with the GraalVM native-image-agent to produce reflection info etc. for the nativeBuild task."
     group = "application"
 
     dependsOn(tasks.build)
-    outputs.dir(agentOutputDir)
+    outputs.dir(nativeAgentOutputDir)
 
     mainClass.set(mainClassFqn)
     classpath = sourceSets.main.get().runtimeClasspath
-    jvmArgs = listOf("-agentlib:native-image-agent=config-output-dir=$agentOutputDir")
+    jvmArgs = listOf("-agentlib:native-image-agent=config-output-dir=$nativeAgentOutputDir")
     args = listOf(
         "--nostart",
         "--config=graalvm-agent.conf",
@@ -35,13 +74,13 @@ nativeBuild {
     mainClass.set(mainClassFqn)
     buildArgs.addAll(
         "--allow-incomplete-classpath",
-        "-H:ConfigurationFileDirectories=$agentOutputDir",
+        "-H:ConfigurationFileDirectories=$nativeAgentOutputDir",
     )
 }
 
 tasks.withType<BuildNativeImageTask>().configureEach {
     dependsOn(nativeAgentRun)
-    inputs.dir(agentOutputDir)
+    inputs.dir(nativeAgentOutputDir)
 }
 
 val serializationVersion: String by project.extra
diff --git a/psoserv/src/main/kotlin/world/phantasmal/psoserv/Main.kt b/psoserv/src/main/kotlin/world/phantasmal/psoserv/Main.kt
index 2eae7019..9e4fdc52 100644
--- a/psoserv/src/main/kotlin/world/phantasmal/psoserv/Main.kt
+++ b/psoserv/src/main/kotlin/world/phantasmal/psoserv/Main.kt
@@ -28,7 +28,7 @@ private val LOGGER = KotlinLogging.logger("main")
 
 fun main(args: Array<String>) {
     try {
-        LOGGER.info { "Initializing." }
+        LOGGER.info { "Initializing psoserv version ${VersionInfo.version}." }
 
         // Try to get config file location from arguments first.
         var configFile: File? = null