Add option to enforce pack.mcmeta check, off by default

bootstrap/src/main/java/org/geysermc/pack/converter/bootstrap/Main.java

@@ -73,6 +73,7 @@ public class Main {
             System.setProperty("PackConverter.Debug", String.valueOf(debug));
 
             new PackConverter()
+                    .enforcePackCheck(true)
                     .input(Path.of(inputPath))
                     .output(Path.of(outputPath))
                     .packName(packName)

bootstrap/src/main/java/org/geysermc/pack/converter/bootstrap/ThunderGUI.java

@@ -123,6 +123,7 @@ public class ThunderGUI extends JFrame {
                 new Thread(() -> {
                     try {
                         new PackConverter()
+                                .enforcePackCheck(true)
                                 .input(inputPath)
                                 .output(outputPath)
                                 .packName(packName.getText().isBlank() ? inputPath.getFileName().toString() : packName.getText())

converter/src/main/java/org/geysermc/pack/converter/PackConverter.java

@@ -61,6 +61,7 @@ public final class PackConverter {
     private String textureSubdirectory;
 
     private boolean compressed;
+    private boolean enforcePackCheck = false;
 
     private final Map<Class<?>, List<ActionListener<?>>> actionListeners = new IdentityHashMap<>();
 
@@ -169,6 +170,17 @@ public final class PackConverter {
         return this;
     }
 
+    /**
+     * Sets if PackConverter should enforce a check for `pack.mcmeta` in the input.
+     *
+     * @param enforcePackCheck whether the check should be done
+     * @return this instance
+     */
+    public PackConverter enforcePackCheck(boolean enforcePackCheck) {
+        this.enforcePackCheck = enforcePackCheck;
+        return this;
+    }
+
     /**
      * Adds a converter to the converter list.
      *
@@ -294,10 +306,10 @@ public final class PackConverter {
         // Need to download the client jar, then use the
         // client jar to get the vanilla models and textures, so we can
         // ensure all parent models exist to convert them to Bedrock.
-        VanillaPackProvider.create(vanillaPackPath, this.logListener);
+        VanillaPackProvider.create(this.vanillaPackPath, this.logListener);
 
         ZipUtils.openFileSystem(this.input, this.compressed, input -> {
-            if (!Files.exists(input.resolve("pack.mcmeta"))) {
+            if (this.enforcePackCheck && !Files.exists(input.resolve("pack.mcmeta"))) {
                 logListener.error("Invalid Java Edition resource pack. No pack.mcmeta found.");
                 return;
             }