fix.

generator/src/main/java/net/infumia/pack/PackReadFilters.java

@@ -0,0 +1,24 @@
+package net.infumia.pack;
+
+import java.nio.file.Path;
+import java.util.function.Predicate;
+
+/**
+ * Utility class for creating read filters for pack reading.
+ */
+public final class PackReadFilters {
+
+    /**
+     * Creates a predicate that filters paths by the specified file extension.
+     *
+     * @param extension the file extension to filter by. Cannot be null.
+     * @return a predicate that returns true for paths with the specified extension.
+     */
+    public static Predicate<Path> withExtension(final String extension) {
+        return path -> path.getFileName().toString().endsWith(extension);
+    }
+
+    private PackReadFilters() {
+        throw new IllegalStateException("Utility class");
+    }
+}

generator/src/main/java/net/infumia/pack/PackReader.java

@@ -44,7 +44,10 @@ PackGeneratorContext read() throws IOException {
     private PackGeneratorContext read0(@NotNull final Stream<Path> walking) throws IOException {
         final PackReferenceMeta packReference = this.packReader.readValue(this.packReferenceFile);
         final Collection<PackReferencePart> packPartReferences = walking
+            .filter(Files::isRegularFile)
+            .filter(this.settings.readFilter())
             .map(Path::toFile)
+            .filter(file -> !this.packReferenceFile.equals(file))
             .map(file -> {
                 try (
                     final MappingIterator<PackReferencePart> iterator =

generator/src/main/java/net/infumia/pack/PackReaderSettings.java

@@ -2,9 +2,11 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import java.nio.file.FileVisitOption;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.Arrays;
 import java.util.StringJoiner;
+import java.util.function.Predicate;
 import net.kyori.adventure.text.serializer.ComponentSerializer;
 
 /**
@@ -18,6 +20,7 @@ public final class PackReaderSettings {
     private final Path outputDirectory;
     private final Path outputFile;
     private final ObjectMapper mapper;
+    private final Predicate<Path> readFilter;
     private final ComponentSerializer<?, ?, String> serializer;
 
     /**
@@ -29,6 +32,7 @@ public final class PackReaderSettings {
      * @param outputDirectory       the directory name. Can be null.
      * @param outputFile            the zip file name. Can be null.
      * @param mapper                the object mapper to read pack and pack part reference files. Cannot be null.
+     * @param readFilter            the read filter for {@link Files#walk(Path, FileVisitOption...)}.
      * @param serializer            the serializer to serialize components when needed. Cannot be null.
      */
     public PackReaderSettings(
@@ -38,6 +42,7 @@ public PackReaderSettings(
         final Path outputDirectory,
         final Path outputFile,
         final ObjectMapper mapper,
+        final Predicate<Path> readFilter,
         final ComponentSerializer<?, ?, String> serializer
     ) {
         this.root = root;
@@ -46,6 +51,7 @@ public PackReaderSettings(
         this.outputDirectory = outputDirectory;
         this.outputFile = outputFile;
         this.mapper = mapper;
+        this.readFilter = readFilter;
         this.serializer = serializer;
     }
 
@@ -57,16 +63,27 @@ public PackReaderSettings(
      * @param outputDirectory       the directory name. Can be null.
      * @param outputFile            the zip file name. Can be null.
      * @param mapper                the object mapper to read pack and pack part reference files. Cannot be null.
+     * @param readFilter            the read filter for {@link Files#walk(Path, FileVisitOption...)}.
      */
     public PackReaderSettings(
         final Path root,
         final String packReferenceFileName,
         final Path outputDirectory,
         final Path outputFile,
         final ObjectMapper mapper,
+        final Predicate<Path> readFilter,
         final ComponentSerializer<?, ?, String> serializer
     ) {
-        this(root, null, packReferenceFileName, outputDirectory, outputFile, mapper, serializer);
+        this(
+            root,
+            null,
+            packReferenceFileName,
+            outputDirectory,
+            outputFile,
+            mapper,
+            readFilter,
+            serializer
+        );
     }
 
     /**
@@ -123,6 +140,15 @@ public ObjectMapper mapper() {
         return this.mapper;
     }
 
+    /**
+     * Returns the read filter.
+     *
+     * @return the read filter.
+     */
+    public Predicate<Path> readFilter() {
+        return this.readFilter;
+    }
+
     /**
      * Returns the component serializer.
      *
@@ -141,6 +167,7 @@ public String toString() {
             .add("outputDirectory=" + this.outputDirectory)
             .add("outputFile=" + this.outputFile)
             .add("mapper=" + this.mapper)
+            .add("readFilter=" + this.readFilter)
             .add("serializer=" + this.serializer)
             .toString();
     }