add launcher subproject and dummy fabric.mod.json

This lets us show an error message if the software is launched with an outdated version of Java

Launcher/build.gradle

@@ -0,0 +1,33 @@
+plugins {
+    id 'java-library'
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compileOnly 'org.slf4j:slf4j-api:2.0.13'
+}
+
+configurations {
+    exports {
+        canBeConsumed = true
+        canBeResolved = false
+    }
+}
+
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(8))
+        vendor.set(JvmVendorSpec.ADOPTIUM)
+    }
+}
+
+tasks.withType(JavaCompile).configureEach {
+    options.encoding = 'UTF-8'
+}
+
+artifacts {
+    exports(jar)
+}

Launcher/src/main/java/dev/upcraft/axiompatcher/LauncherMain.java

@@ -0,0 +1,41 @@
+package dev.upcraft.axiompatcher;
+
+import org.slf4j.LoggerFactory;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class LauncherMain {
+
+    public static void main(String[] args) {
+        String javaVersion = System.getProperty("java.version");
+        int javaVersionNumber;
+        String[] split = javaVersion.split("\\.", 3);
+        if (javaVersion.startsWith("1.")) {
+            javaVersionNumber = Integer.parseInt(split[1]);
+        } else {
+            javaVersionNumber = Integer.parseInt(split[0]);
+        }
+
+        if (javaVersionNumber < 17) {
+            System.out.println("ERROR: You need to have Java 17 or higher installed to run this application.");
+            JOptionPane.showMessageDialog(null, "You need to have Java 17 or higher installed to run this application.", "Error", JOptionPane.ERROR_MESSAGE);
+            System.exit(1);
+        } else {
+            try {
+                Class.forName("dev.upcraft.axiompatcher.Main").getDeclaredMethod("main", String[].class).invoke(null, (Object) args);
+            } catch (Exception e) {
+                throw new RuntimeException("Unable to launch Axiom Patcher UI", e);
+            }
+        }
+    }
+
+    @SuppressWarnings("unused")
+    public static void notAMinecraftMod() {
+        LoggerFactory.getLogger(LauncherMain.class).error("AxiomPatcher is not a Minecraft mod, it must be run as standalone application.");
+        if(!GraphicsEnvironment.isHeadless()) {
+            JOptionPane.showMessageDialog(null, "AxiomPatcher is not a Minecraft mod, it must be run as standalone application.", "Error", JOptionPane.ERROR_MESSAGE);
+        }
+        System.exit(1);
+    }
+}

build.gradle

@@ -21,7 +21,7 @@ javafx {
     ]
 }
 
-mainClassName = 'dev.upcraft.axiompatcher.Main'
+mainClassName = 'dev.upcraft.axiompatcher.LauncherMain'
 application {
     mainClass.set(mainClassName)
 }
@@ -47,6 +47,18 @@ java {
     }
 }
 
+processResources {
+    inputs.property("version", version)
+    filesMatching('*.mod.json') {
+        expand(version: version)
+    }
+}
+
+tasks.withType(AbstractArchiveTask).configureEach {
+    preserveFileTimestamps = false
+    reproducibleFileOrder = true
+}
+
 repositories {
     mavenCentral()
 
@@ -65,6 +77,8 @@ dependencies {
 
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+
+    runtimeOnly project(path: ':Launcher', configuration: 'exports')
 }
 
 test {

settings.gradle

@@ -3,3 +3,5 @@ plugins {
 }
 
 rootProject.name = 'AxiomPatcher'
+
+include 'Launcher'

src/main/resources/fabric.mod.json

@@ -0,0 +1,14 @@
+{
+  "schemaVersion": 1,
+  "id": "axiom-patcher",
+  "name": "Axiom Patcher",
+  "version": "${version}",
+  "authors": [
+    "Up"
+  ],
+  "entrypoints": {
+    "preLaunch": [
+      "dev.upcraft.axiompatcher.LauncherMain::notAMinecraftMod"
+    ]
+  }
+}