Introduce -version argument to display version

build.gradle

@@ -45,6 +45,14 @@ targetCompatibility = JavaVersion.VERSION_17
 group = 'xyz.grasscutters'
 version = '1.1.1-dev'
 
+def gitCommitHash = {
+    try {
+        return 'git rev-parse --verify --short HEAD'.execute().text.trim()
+    } catch (e) {
+        return "GIT_NOT_FOUND"
+    }
+}
+
 sourceCompatibility = 17
 targetCompatibility = 17
 
@@ -97,6 +105,7 @@ application {
     mainClassName = 'emu.grasscutter.Grasscutter'
 }
 
+
 jar {
     manifest {
         attributes 'Main-Class': 'emu.grasscutter.Grasscutter'
@@ -113,6 +122,13 @@ jar {
     from('src/main/java') {
         include '*.xml'
     }
+    new File(projectDir, "src/generated/main/java/emu/grasscutter/BuildConfig.java").text = """
+    package emu.grasscutter;
+    public class BuildConfig {
+            public static final String VERSION = \"${version}\";
+            public static final String GIT_HASH = \"${gitCommitHash()}\";
+    }
+    """
 
     destinationDir = file(".")
 }

src/main/java/emu/grasscutter/Grasscutter.java

@@ -29,6 +29,7 @@ import emu.grasscutter.server.dispatch.DispatchServer;
 import emu.grasscutter.server.game.GameServer;
 import emu.grasscutter.tools.Tools;
 import emu.grasscutter.utils.Crypto;
+import emu.grasscutter.BuildConfig;
 
 import javax.annotation.Nullable;
 
@@ -82,6 +83,9 @@ public final class Grasscutter {
 				case "-gachamap" -> {
 					Tools.createGachaMapping(DATA("gacha_mappings.js")); exitEarly = true;
 				}
+				case "-version" -> {
+					System.out.println("Grasscutter version: " + BuildConfig.VERSION + "\nGit Hash: " + BuildConfig.GIT_HASH); exitEarly = true;
+				}
 			}
 		}