Add //placement, which sets either pos1 or player explicitly

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

@@ -38,6 +38,7 @@
 import com.sk89q.worldedit.function.mask.Mask;
 import com.sk89q.worldedit.function.operation.Operations;
 import com.sk89q.worldedit.function.visitor.RegionVisitor;
+import com.sk89q.worldedit.internal.annotation.Offset;
 import com.sk89q.worldedit.internal.command.CommandRegistrationHandler;
 import com.sk89q.worldedit.internal.command.CommandUtil;
 import com.sk89q.worldedit.internal.cui.ServerCUIHandler;
@@ -445,6 +446,23 @@ public void togglePlace(Actor actor, LocalSession session) {
         }
     }
 
+    @Command(
+        name = "placement",
+        aliases = {"/placement"},
+        desc = "Select which placement to use"
+    )
+    public void placement(Actor actor, LocalSession session,
+                          @Arg(desc = "Which placement type to use")
+                          PlacementType placementType,
+                          @Arg(desc = "number of times to apply the offset", def = "1")
+                          int multiplier,
+                          @Arg(desc = "How much to offset from it placement to use", def = Offset.ZERO)
+                          @Offset
+                          BlockVector3 offset) {
+        offset = offset.multiply(multiplier);
+        placementImpl(actor, session, new Placement(placementType, offset));
+    }
+
     @Command(
         name = "searchitem",
         aliases = {"/searchitem", "/l", "/search"},

worldedit-core/src/main/java/com/sk89q/worldedit/command/argument/EnumConverter.java

@@ -23,6 +23,7 @@
 import com.sk89q.worldedit.EditSession;
 import com.sk89q.worldedit.command.util.HookMode;
 import com.sk89q.worldedit.extent.TracingExtent;
+import com.sk89q.worldedit.session.PlacementType;
 import com.sk89q.worldedit.util.SideEffect;
 import com.sk89q.worldedit.util.TreeGenerator;
 import org.enginehub.piston.CommandManager;
@@ -57,6 +58,8 @@ public static void register(CommandManager commandManager) {
             basic(HookMode.class));
         commandManager.registerConverter(Key.of(TracingExtent.Action.class),
             basic(TracingExtent.Action.class));
+        commandManager.registerConverter(Key.of(PlacementType.class),
+            basic(PlacementType.class));
     }
 
     private static <E extends Enum<E>> ArgumentConverter<E> basic(Class<E> enumClass) {

worldedit-core/src/main/java/com/sk89q/worldedit/internal/annotation/Offset.java

@@ -35,4 +35,5 @@
 @InjectAnnotation
 public @interface Offset {
     String FORWARD = "forward";
+    String ZERO = "0,0,0";
 }