Better logic for selecting schematic format.

- You had to specifically use //schem load <schematic>.schematic mcedit to load legacy schematics, now if you're loading .schematic it assumes you're wanting mcedit format
 - If you end up attempting to load an mcedit schematic with the sponge reader it now throws an exception.

worldedit-core/src/main/java/com/sk89q/worldedit/command/SchematicCommands.java

@@ -201,7 +201,7 @@ public class SchematicCommands {
                          String formatName) throws FilenameException {
         LocalConfiguration config = worldEdit.getConfiguration();
 
-        ClipboardFormat format = ClipboardFormats.findByAlias(formatName);
+        ClipboardFormat format = null;
         InputStream in = null;
         try {
             URI uri;
@@ -221,6 +221,7 @@ public class SchematicCommands {
                 File dir = Settings.IMP.PATHS.PER_PLAYER_SCHEMATICS ? new File(saveDir, actor.getUniqueId().toString()) : saveDir;
                 File file;
                 if (filename.startsWith("#")) {
+                    format = ClipboardFormats.findByAlias(formatName);
                     String[] extensions;
                     if (format != null) {
                         extensions = format.getFileExtensions().toArray(new String[0]);
@@ -237,9 +238,11 @@ public class SchematicCommands {
                         actor.print(Caption.of("fawe.error.no-perm", "worldedit.schematic.load.other"));
                         return;
                     }
-                    if (format == null && filename.matches(".*\\.[\\w].*")) {
+                    if (filename.matches(".*\\.[\\w].*")) {
-                        String extension = filename.substring(filename.lastIndexOf('.') + 1);
+                        format = ClipboardFormats
-                        format = ClipboardFormats.findByExtension(extension);
+                            .findByExtension(filename.substring(filename.lastIndexOf('.') + 1));
+                    } else {
+                        format = ClipboardFormats.findByAlias(formatName);
                     }
                     file = MainUtil.resolve(dir, filename, format, false);
                 }

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/io/FastSchematicReader.java

@@ -69,6 +69,7 @@ public class FastSchematicReader extends NBTSchematicReader {
     private final NBTInputStream inputStream;
     private DataFixer fixer = null;
     private int dataVersion = -1;
+    private int version = -1;
 
     private FastByteArrayOutputStream blocksOut;
     private FaweOutputStream blocks;
@@ -119,6 +120,7 @@ public class FastSchematicReader extends NBTSchematicReader {
         StreamDelegate root = new StreamDelegate();
         StreamDelegate schematic = root.add("Schematic");
         schematic.add("DataVersion").withInt((i, v) -> dataVersion = v);
+        schematic.add("Version").withInt((i, v) -> version = v);
         schematic.add("Width").withInt((i, v) -> width = v);
         schematic.add("Height").withInt((i, v) -> height = v);
         schematic.add("Length").withInt((i, v) -> length = v);
@@ -196,6 +198,11 @@ public class FastSchematicReader extends NBTSchematicReader {
     public Clipboard read(UUID uuid, Function<BlockVector3, Clipboard> createOutput) throws IOException {
         StreamDelegate root = createDelegate();
         inputStream.readNamedTagLazy(root);
+
+        if (version != 1 && version != 2) {
+            throw new IOException("This schematic version is currently not supported");
+        }
+
         if (blocks != null) blocks.close();
         if (biomes != null) biomes.close();
         blocks = null;