8 files changed, 68 insertions, 7 deletions
diff --git a/src/main/java/com/keuin/kbackupfabric/KBCommandRegister.java b/src/main/java/com/keuin/kbackupfabric/KBCommandRegister.java
index 79029bf..674ac0c 100644
--- a/src/main/java/com/keuin/kbackupfabric/KBCommandRegister.java
+++ b/src/main/java/com/keuin/kbackupfabric/KBCommandRegister.java
@@ -12,7 +12,7 @@ public final class KBCommandRegister {
     public static void registerCommands(CommandDispatcher<ServerCommandSource> dispatcher) {
         // register /kb and /kb help for help menu
 
-        dispatcher.register(CommandManager.literal("kb").executes(KBCommands::help));
+        dispatcher.register(CommandManager.literal("kb").executes(KBCommands::kb));
         dispatcher.register(CommandManager.literal("kb").then(CommandManager.literal("help").executes(KBCommands::help)));
 
         // register /kb list for showing the backup list. OP is required.
diff --git a/src/main/java/com/keuin/kbackupfabric/KBCommands.java b/src/main/java/com/keuin/kbackupfabric/KBCommands.java
index dbe5252..f2671ad 100644
--- a/src/main/java/com/keuin/kbackupfabric/KBCommands.java
+++ b/src/main/java/com/keuin/kbackupfabric/KBCommands.java
@@ -1,6 +1,7 @@
 package com.keuin.kbackupfabric;
 
-import com.keuin.kbackupfabric.data.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.MetadataHolder;
 import com.keuin.kbackupfabric.operation.AbstractConfirmableOperation;
 import com.keuin.kbackupfabric.util.BackupFilesystemUtil;
 import com.keuin.kbackupfabric.util.BackupNameTimeFormatter;
@@ -48,6 +49,27 @@ public final class KBCommands {
         return SUCCESS;
     }
 
+    /**
+     * Print the help menu. (May show extra info during the first run after restoring)
+     *
+     * @param context the context.
+     * @return stat code.
+     */
+    public static int kb(CommandContext<ServerCommandSource> context) {
+        int statCode = list(context);
+        if (MetadataHolder.hasMetadata()) {
+            // Output metadata info
+            msgStress(context, "Restored from backup " + MetadataHolder.getMetadata().getBackupName());
+        }
+        return statCode;
+    }
+
+    /**
+     * List all existing backups.
+     *
+     * @param context the context.
+     * @return stat code.
+     */
     public static int list(CommandContext<ServerCommandSource> context) {
         msgInfo(context, "Available backups: (file is not checked, manipulation may affect this plugin)");
         MinecraftServer server = context.getSource().getMinecraftServer();
diff --git a/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java b/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
index 1f39266..f3a3b07 100644
--- a/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
+++ b/src/main/java/com/keuin/kbackupfabric/KBPluginEvents.java
@@ -1,6 +1,7 @@
 package com.keuin.kbackupfabric;
 
-import com.keuin.kbackupfabric.data.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.MetadataHolder;
 import com.keuin.kbackupfabric.util.BackupFilesystemUtil;
 import com.keuin.kbackupfabric.util.BackupNameSuggestionProvider;
 import com.keuin.kbackupfabric.util.PrintUtil;
@@ -46,7 +47,7 @@ public final class KBPluginEvents implements ModInitializer, ServerStartCallback
             File metadataFile = new File(levelDirectory, BackupMetadata.metadataFileName);
             if (metadataFile.exists()) {
                 // Metadata exists. Deserialize.
-                BackupMetadata metadata = null;
+                BackupMetadata metadata;
                 FileInputStream fileInputStream = new FileInputStream(metadataFile);
                 ObjectInputStream in = new ObjectInputStream(fileInputStream);
                 metadata = (BackupMetadata) in.readObject();
@@ -54,6 +55,7 @@ public final class KBPluginEvents implements ModInitializer, ServerStartCallback
                 fileInputStream.close();
 
                 // Print metadata
+                MetadataHolder.setMetadata(metadata);
                 PrintUtil.info("Recovered from previous backup:");
                 PrintUtil.info("Backup Name: " + metadata.getBackupName());
                 PrintUtil.info("Create Time: " + (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")).format(new Date(metadata.getBackupTime())));
diff --git a/src/main/java/com/keuin/kbackupfabric/data/BackupMetadata.java b/src/main/java/com/keuin/kbackupfabric/metadata/BackupMetadata.java
index 48670c6..b8cb852 100644
--- a/src/main/java/com/keuin/kbackupfabric/data/BackupMetadata.java
+++ b/src/main/java/com/keuin/kbackupfabric/metadata/BackupMetadata.java
@@ -1,7 +1,10 @@
-package com.keuin.kbackupfabric.data;
+package com.keuin.kbackupfabric.metadata;
 
 import java.io.Serializable;
 
+/**
+ * WARNING: DO NOT modify this class, or the plugin will be incompatible with backups created by older versions.
+ */
 public class BackupMetadata implements Serializable {
     public static final String metadataFileName = "kbackup_metadata";
     private static final long serialVersionUID = 1L;
diff --git a/src/main/java/com/keuin/kbackupfabric/metadata/MetadataHolder.java b/src/main/java/com/keuin/kbackupfabric/metadata/MetadataHolder.java
new file mode 100644
index 0000000..4180a19
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/metadata/MetadataHolder.java
@@ -0,0 +1,22 @@
+package com.keuin.kbackupfabric.metadata;
+
+/**
+ * In the first startup after restoring from a previous backup, the metadata is stored in this class.
+ * The setMetadata can only be called when startup
+ */
+public class MetadataHolder {
+    private static BackupMetadata metadata = null;
+
+    public static BackupMetadata getMetadata() {
+        return metadata;
+    }
+
+    public static void setMetadata(BackupMetadata metadata) {
+        if (MetadataHolder.metadata == null)
+            MetadataHolder.metadata = metadata;
+    }
+
+    public static boolean hasMetadata() {
+        return MetadataHolder.metadata != null;
+    }
+}
diff --git a/src/main/java/com/keuin/kbackupfabric/util/PrintUtil.java b/src/main/java/com/keuin/kbackupfabric/util/PrintUtil.java
index ca00ad4..11995e7 100644
--- a/src/main/java/com/keuin/kbackupfabric/util/PrintUtil.java
+++ b/src/main/java/com/keuin/kbackupfabric/util/PrintUtil.java
@@ -15,11 +15,16 @@ public final class PrintUtil {
     private static final Object syncMessage = new Object();
 
     private static final Style infoStyle = new Style().setColor(Formatting.WHITE);
+    private static final Style stressStyle = new Style().setColor(Formatting.AQUA).setBold(true);
     private static final Style warnStyle = new Style().setColor(Formatting.YELLOW);
     private static final Style errorStyle = new Style().setColor(Formatting.DARK_RED);
 
     private static final Logger LOGGER = LogManager.getLogger();
 
+    public static CommandContext<ServerCommandSource> msgStress(CommandContext<ServerCommandSource> context, String messageText) {
+        return msgStress(context, messageText, false);
+    }
+
     public static CommandContext<ServerCommandSource> msgInfo(CommandContext<ServerCommandSource> context, String messageText) {
         return msgInfo(context, messageText, false);
     }
@@ -32,6 +37,10 @@ public final class PrintUtil {
         return msgErr(context, messageText, false);
     }
 
+    public static CommandContext<ServerCommandSource> msgStress(CommandContext<ServerCommandSource> context, String messageText, boolean broadcastToOps) {
+        return message(context, messageText, broadcastToOps, stressStyle);
+    }
+
     public static CommandContext<ServerCommandSource> msgInfo(CommandContext<ServerCommandSource> context, String messageText, boolean broadcastToOps) {
         return message(context, messageText, broadcastToOps, infoStyle);
     }
diff --git a/src/main/java/com/keuin/kbackupfabric/util/ZipUtil.java b/src/main/java/com/keuin/kbackupfabric/util/ZipUtil.java
index e819afc..ee2907e 100644
--- a/src/main/java/com/keuin/kbackupfabric/util/ZipUtil.java
+++ b/src/main/java/com/keuin/kbackupfabric/util/ZipUtil.java
@@ -1,6 +1,6 @@
 package com.keuin.kbackupfabric.util;
 
-import com.keuin.kbackupfabric.data.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.BackupMetadata;
 
 import java.io.*;
 import java.util.Enumeration;
@@ -21,6 +21,9 @@ public final class ZipUtil {
             return;
         }
 
+        if (file.getName().equals(BackupMetadata.metadataFileName))
+            return; // Reject
+
         // 如果是文件，则直接压缩该文件
         if (file.isFile()) {
             int count, bufferLen = 1024;
diff --git a/src/main/java/com/keuin/kbackupfabric/worker/BackupWorker.java b/src/main/java/com/keuin/kbackupfabric/worker/BackupWorker.java
index 675d183..e972b4d 100644
--- a/src/main/java/com/keuin/kbackupfabric/worker/BackupWorker.java
+++ b/src/main/java/com/keuin/kbackupfabric/worker/BackupWorker.java
@@ -1,6 +1,6 @@
 package com.keuin.kbackupfabric.worker;
 
-import com.keuin.kbackupfabric.data.BackupMetadata;
+import com.keuin.kbackupfabric.metadata.BackupMetadata;
 import com.keuin.kbackupfabric.util.PrintUtil;
 import com.keuin.kbackupfabric.util.ZipUtil;
 import com.keuin.kbackupfabric.util.ZipUtilException;