feat: read mc & java version from version.json

.gitignore

@@ -24,6 +24,10 @@ local.properties
 .factorypath
 .apt_generated/
 
+# VSCode stuff
+.vscode/
+.classpath
+
 # macOS
 .DS_Store
 
@@ -42,4 +46,4 @@ ehthumbs_vista.db
 .gradletasknamecache
 
 # Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
-!gradle-wrapper.ja
+!gradle-wrapper.jar

build.gradle.kts

@@ -15,7 +15,7 @@ subprojects {
 val mainClass = "io.papermc.paperclip.Main"
 
 tasks.jar {
-    val java6Jar = project(":java6").tasks.named("jar")
+    val java6Jar = project(":java6").tasks.named("shadowJar")
     val java17Jar = project(":java17").tasks.named("shadowJar")
     dependsOn(java6Jar, java17Jar)
 

java6/build.gradle.kts

@@ -1,5 +1,14 @@
 plugins {
     java
+    id("com.github.johnrengelman.shadow") version "8.1.1"
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("com.eclipsesource.minimal-json:minimal-json:0.9.5")
 }
 
 java {
@@ -14,3 +23,13 @@ tasks.withType<JavaCompile>().configureEach {
     options.release.set(6)
     options.compilerArgs = listOf("-Xlint:-options")
 }
+
+tasks.shadowJar {
+    val prefix = "paperclip.libs"
+    listOf("com.eclipsesource").forEach { pack ->
+        relocate(pack, "$prefix.$pack")
+    }
+
+    exclude("META-INF/LICENSE.txt")
+    exclude("META-INF/NOTICE.txt")
+}

java6/src/main/java/io/papermc/paperclip/Main.java

@@ -9,14 +9,46 @@
 
 package io.papermc.paperclip;
 
+import com.eclipsesource.json.Json;
+import com.eclipsesource.json.JsonObject;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
 import java.lang.reflect.Method;
 
 public final class Main {
 
+    private static final JsonObject VERSION = readJsonFile();
+
+    private static JsonObject readJsonFile() {
+        final JsonObject object;
+
+        InputStreamReader reader = null;
+
+        try {
+            reader = new InputStreamReader(Main.class.getClassLoader().getResourceAsStream("version.json"), "UTF_8");
+            object = Json.parse(reader).asObject();
+        } catch (final IOException exc) {
+            throw new RuntimeException("Failed to read version.json", exc);
+        } finally {
+            if (reader != null) {
+                try {
+                    reader.close();
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        }
+
+        return object;
+    }
+
     public static void main(final String[] args) {
-        if (getJavaVersion() < 17) {
-            System.err.println("Minecraft 1.19 requires running the server with Java 17 or above. " +
-                "Download Java 17 (or above) from https://adoptium.net/");
+        final int javaVersion = VERSION.getInt("java_version", 17);
+        final String minecraftVersion = VERSION.getString("name", "Unknown");
+        if (getJavaVersion() < javaVersion) {
+            System.err.printf("Minecraft %s requires running the server with Java %s or above. " +
+                    "Download Java %s (or above) from https://adoptium.net/", minecraftVersion, javaVersion, javaVersion);
             System.exit(1);
         }
 

settings.gradle.kts

@@ -3,4 +3,4 @@ plugins {
 }
 
 rootProject.name = "paperclip"
-include("java6", "java17")
+include("java6", "java17")