More CommandBlock API

paper-api/src/main/java/io/papermc/paper/command/CommandBlockHolder.java

@@ -0,0 +1,57 @@
+package io.papermc.paper.command;
+
+import net.kyori.adventure.text.Component;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+@NullMarked
+public interface CommandBlockHolder {
+
+    /**
+     * Gets the command that this CommandBlock will run when powered.
+     * This will never return null.  If the CommandBlock does not have a
+     * command, an empty String will be returned instead.
+     *
+     * @return Command that this CommandBlock will run when activated.
+     */
+    String getCommand();
+
+    /**
+     * Sets the command that this CommandBlock will run when powered.
+     * Setting the command to null is the same as setting it to an empty
+     * String.
+     *
+     * @param command Command that this CommandBlock will run when activated.
+     */
+    void setCommand(@Nullable String command);
+
+    /**
+     * Gets the last output from this command block.
+     *
+     * @return the last output
+     */
+    Component lastOutput();
+
+    /**
+     * Sets the last output from this command block.
+     *
+     * @param lastOutput the last output
+     */
+    void lastOutput(@Nullable Component lastOutput);
+
+    /**
+     * Gets the success count from this command block.
+     * @see <a href="https://minecraft.wiki/wiki/Command_Block#Success_count">Command_Block#Success_count</a>
+     *
+     * @return the success count
+     */
+    int getSuccessCount();
+
+    /**
+     * Sets the success count from this command block.
+     * @see <a href="https://minecraft.wiki/wiki/Command_Block#Success_count">Command_Block#Success_count</a>
+     *
+     * @param successCount the success count
+     */
+    void setSuccessCount(int successCount);
+}

paper-api/src/main/java/org/bukkit/block/CommandBlock.java

@@ -6,7 +6,7 @@ import org.jetbrains.annotations.Nullable;
 /**
  * Represents a captured state of a command block.
  */
-public interface CommandBlock extends TileState {
+public interface CommandBlock extends TileState, io.papermc.paper.command.CommandBlockHolder { // Paper
 
     /**
      * Gets the command that this CommandBlock will run when powered.

paper-api/src/main/java/org/bukkit/entity/minecart/CommandMinecart.java

@@ -4,7 +4,7 @@ import org.bukkit.entity.Minecart;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-public interface CommandMinecart extends Minecart {
+public interface CommandMinecart extends Minecart, io.papermc.paper.command.CommandBlockHolder { // Paper
 
     /**
      * Gets the command that this CommandMinecart will run when activated.