Cleanup multiple batch usage for chunk deletion.

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

@@ -133,17 +133,13 @@ public class ChunkCommands {
         newBatch.worldPath = worldDir.toAbsolutePath().normalize().toString();
         newBatch.backup = true;
         final Region selection = session.getSelection(player.getWorld());
-        int chunkCount;
         if (selection instanceof CuboidRegion) {
             newBatch.minChunk = BlockVector2.at(selection.getMinimumPoint().getBlockX() >> 4, selection.getMinimumPoint().getBlockZ() >> 4);
             newBatch.maxChunk = BlockVector2.at(selection.getMaximumPoint().getBlockX() >> 4, selection.getMaximumPoint().getBlockZ() >> 4);
-            final BlockVector2 dist = newBatch.maxChunk.subtract(newBatch.minChunk).add(1, 1);
-            chunkCount = dist.getBlockX() * dist.getBlockZ();
         } else {
             // this has a possibility to OOM for very large selections still
             Set<BlockVector2> chunks = selection.getChunks();
             newBatch.chunks = new ArrayList<>(chunks);
-            chunkCount = chunks.size();
         }
         if (beforeTime != null) {
             newBatch.deletionPredicates = new ArrayList<>();
@@ -161,9 +157,15 @@ public class ChunkCommands {
             throw new StopExecutionException(TextComponent.of("Failed to write chunk list: " + e.getMessage()));
         }
 
-        player.print(String.format("%d chunk(s) have been marked for deletion and will be deleted the next time the server starts.", chunkCount));
-        player.print(TextComponent.of("You can mark more chunks for deletion, or to stop the server now, run: ", TextColor.LIGHT_PURPLE)
-                .append(TextComponent.of("/stop", TextColor.AQUA).clickEvent(ClickEvent.of(ClickEvent.Action.SUGGEST_COMMAND, "/stop"))));
+        player.print(String.format("%d chunk(s) have been marked for deletion the next time the server starts.",
+                newBatch.getChunkCount()));
+        if (currentInfo.batches.size() > 1) {
+            player.printDebug(String.format("%d chunks total marked for deletion. (May have overlaps).",
+                    currentInfo.batches.stream().mapToInt(ChunkDeletionInfo.ChunkBatch::getChunkCount).sum()));
+        }
+        player.print(TextComponent.of("You can mark more chunks for deletion, or to stop now, run: ", TextColor.LIGHT_PURPLE)
+                .append(TextComponent.of("/stop", TextColor.AQUA)
+                        .clickEvent(ClickEvent.of(ClickEvent.Action.SUGGEST_COMMAND, "/stop"))));
     }
 
 }

worldedit-core/src/main/java/com/sk89q/worldedit/internal/anvil/ChunkDeleter.java

@@ -70,7 +70,7 @@ public final class ChunkDeleter {
 
     public static void writeInfo(ChunkDeletionInfo info, Path chunkFile) throws IOException, JsonIOException {
         String json = chunkDeleterGson.toJson(info, new TypeToken<ChunkDeletionInfo>() {}.getType());
-        try (BufferedWriter writer = Files.newBufferedWriter(chunkFile, StandardOpenOption.CREATE)) {
+        try (BufferedWriter writer = Files.newBufferedWriter(chunkFile)) {
             writer.write(json);
         }
     }
@@ -130,10 +130,14 @@ public final class ChunkDeleter {
     }
 
     private boolean runBatch(ChunkDeletionInfo.ChunkBatch chunkBatch) {
-        logger.debug("Processing deletion batch.");
+        int chunkCount = chunkBatch.getChunkCount();
+        logger.debug("Processing deletion batch with {} chunks.", chunkCount);
         final Map<Path, Stream<BlockVector2>> regionToChunkList = groupChunks(chunkBatch);
         BiPredicate<RegionAccess, BlockVector2> predicate = createPredicates(chunkBatch.deletionPredicates);
         shouldPreload = chunkBatch.chunks == null;
+        deletionsRequested += chunkCount;
+        debugRate = chunkCount / 10;
+
         return regionToChunkList.entrySet().stream().allMatch(entry -> {
             Path regionPath = entry.getKey();
             if (!Files.exists(regionPath)) return true;
@@ -152,8 +156,6 @@ public final class ChunkDeleter {
     private Map<Path, Stream<BlockVector2>> groupChunks(ChunkDeletionInfo.ChunkBatch chunkBatch) {
         Path worldPath = Paths.get(chunkBatch.worldPath);
         if (chunkBatch.chunks != null) {
-            deletionsRequested += chunkBatch.chunks.size();
-            debugRate = chunkBatch.chunks.size() / 10;
             return chunkBatch.chunks.stream()
                     .collect(Collectors.groupingBy(RegionFilePos::new))
                     .entrySet().stream().collect(Collectors.toMap(
@@ -193,10 +195,6 @@ public final class ChunkDeleter {
                     groupedChunks.put(regionPath, stream);
                 }
             }
-            final BlockVector2 dist = maxChunk.subtract(minChunk).add(1, 1);
-            final int batchSize = dist.getBlockX() * dist.getBlockZ();
-            debugRate = batchSize / 10;
-            this.deletionsRequested += batchSize;
             return groupedChunks;
         }
     }
@@ -256,7 +254,7 @@ public final class ChunkDeleter {
                 if (deletionPredicate.test(region, chunk)) {
                     region.deleteChunk(chunk);
                     totalChunksDeleted++;
-                    if (totalChunksDeleted % debugRate == 0) {
+                    if (debugRate != 0 && totalChunksDeleted % debugRate == 0) {
                         logger.debug("Deleted {} chunks so far.", totalChunksDeleted);
                     }
                 } else {

worldedit-core/src/main/java/com/sk89q/worldedit/internal/anvil/ChunkDeletionInfo.java

@@ -38,6 +38,12 @@ public class ChunkDeletionInfo {
         public List<BlockVector2> chunks;
         public BlockVector2 minChunk;
         public BlockVector2 maxChunk;
+
+        public int getChunkCount() {
+            if (chunks != null) return chunks.size();
+            final BlockVector2 dist = maxChunk.subtract(minChunk).add(1, 1);
+            return dist.getBlockX() * dist.getBlockZ();
+        }
     }
 
     public static class DeletionPredicate {