feat(build): add Shadow plugin and update jar task configuration; refactor file validation

Author: Adversing

build.gradle.kts

@@ -1,6 +1,7 @@
 plugins {
     java
     application
+    id("com.github.johnrengelman.shadow") version "8.1.1"
 }
 
 group = "me.adversing"
@@ -30,9 +31,29 @@ application {
     mainClass.set("me.adversing.Main")
 }
 
+tasks.jar {
+    manifest {
+        attributes(
+            "Main-Class" to "me.adversing.Main"
+        )
+    }
+}
+
 tasks.withType<JavaExec> {
     jvmArgs(
         "--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED",
         "--add-opens=java.base/jdk.internal.misc=ALL-UNNAMED"
     )
 }
+
+tasks.shadowJar {
+    archiveClassifier.set("all")
+    manifest {
+        attributes(
+            "Main-Class" to "me.adversing.Main",
+            "Add-Exports" to "java.base/jdk.internal.misc",
+            "Add-Opens" to "java.base/jdk.internal.misc"
+        )
+    }
+}
+

src/main/java/me/adversing/Main.java

@@ -21,7 +21,7 @@ public static void main(String[] args) {
 
         DiagnosticService diagnosticService = new DiagnosticService();
         Parser parser = new Parser(diagnosticService);
-        String file = validateFile(args[0]);
+        String file = validateFile(args);
         File asmFile = new File(file);
 
         try (ASMEvaluator evaluator = new ASMEvaluator(diagnosticService, debug)) {
@@ -55,10 +55,16 @@ private static boolean hasDebugFlag(String[] args) {
         return Arrays.stream(args).anyMatch(arg -> "--debug".equals(arg) || "-d".equals(arg));
     }
 
-    private static String validateFile(String file) {
-        if (file == null) {
-            throw new IllegalArgumentException("No file provided.");
+    private static String validateFile(String[] args) {
+        if (args == null || args.length == 0) {
+            throw new IllegalArgumentException("No arguments provided.");
         }
+
+        String file = args[0];
+        if (file == null || file.trim().isEmpty()) {
+            throw new IllegalArgumentException("File path cannot be null or empty.");
+        }
+
         return file;
     }
 }