Integrate void block with commands (#1333)

* Integrate void block with paste

* Update src/blueprint.zig

Co-authored-by: IntegratedQuantum <43880493+IntegratedQuantum@users.noreply.github.com>

* Add -v flag description to /paste command description

* Swap conditions in paste

---------

Co-authored-by: IntegratedQuantum <43880493+IntegratedQuantum@users.noreply.github.com>

src/blocks.zig

@@ -20,6 +20,7 @@ const Entity = main.server.Entity;
 const entity_data = @import("entity_data.zig");
 const EntityDataClass = entity_data.EntityDataClass;
 const sbb = main.server.terrain.structure_building_blocks;
+const blueprint = main.blueprint;
 
 var arena = main.heap.NeverFailingArenaAllocator.init(main.globalAllocator);
 const allocator = arena.allocator();
@@ -207,6 +208,7 @@ pub fn finishBlocks(zonElements: std.StringHashMap(ZonElement)) void {
 		registerLodReplacement(i, zonElements.get(_id[i]) orelse continue);
 		registerOpaqueVariant(i, zonElements.get(_id[i]) orelse continue);
 	}
+	blueprint.registerVoidBlock(parseBlock("cubyz:void"));
 }
 
 pub fn reset() void {

src/blueprint.zig

@@ -21,6 +21,7 @@ const BinaryWriter = main.utils.BinaryWriter;
 const BinaryReader = main.utils.BinaryReader;
 
 pub const blueprintVersion = 0;
+var voidType: ?u16 = null;
 
 pub const BlueprintCompression = enum(u16) {
 	deflate,
@@ -104,7 +105,10 @@ pub const Blueprint = struct {
 		}
 		return .{.success = self};
 	}
-	pub fn paste(self: Blueprint, pos: Vec3i) void {
+	pub const PasteFlags = struct {
+		preserveVoid: bool = false,
+	};
+	pub fn paste(self: Blueprint, pos: Vec3i, flags: PasteFlags) void {
 		const startX = pos[0];
 		const startY = pos[1];
 		const startZ = pos[2];
@@ -119,7 +123,8 @@ pub const Blueprint = struct {
 					const worldZ = startZ +% @as(i32, @intCast(z));
 
 					const block = self.blocks.get(x, y, z);
-					_ = main.server.world.?.updateBlock(worldX, worldY, worldZ, block);
+					if(block.typ != voidType or flags.preserveVoid)
+						_ = main.server.world.?.updateBlock(worldX, worldY, worldZ, block);
 				}
 			}
 		}
@@ -270,3 +275,8 @@ pub const Blueprint = struct {
 		}
 	}
 };
+
+pub fn registerVoidBlock(block: Block) void {
+	voidType = block.typ;
+	std.debug.assert(voidType != 0);
+}

src/server/command/worldedit/paste.zig

@@ -10,13 +10,22 @@ const copy = @import("copy.zig");
 const Block = main.blocks.Block;
 const Blueprint = main.blueprint.Blueprint;
 
-pub const description = "Paste clipboard content to current player position.";
+pub const description =
-pub const usage = "/paste";
+	\\Paste clipboard content to current player position.
+	\\'-v' - Enable preserving void blocks. By default, void blocks are not preserved.
+;
+pub const usage = "/paste [-v]";
 
 pub fn execute(args: []const u8, source: *User) void {
+	var flags = Blueprint.PasteFlags{};
+
 	if(args.len != 0) {
-		source.sendMessage("#ff0000Too many arguments for command /paste. Expected no arguments.", .{});
+		if(std.mem.eql(u8, args, "-v")) {
-		return;
+			flags.preserveVoid = true;
+		} else {
+			source.sendMessage("#ff0000Argument(s) '{s}' not recognized.", .{args});
+			return;
+		}
 	}
 
 	if(source.worldEditData.clipboard) |clipboard| {
@@ -38,7 +47,7 @@ pub fn execute(args: []const u8, source: *User) void {
 			},
 		}
 
-		clipboard.paste(pos);
+		clipboard.paste(pos, flags);
 	} else {
 		source.sendMessage("#ff0000Error: No clipboard content to paste.", .{});
 	}

src/server/command/worldedit/redo.zig

@@ -20,7 +20,7 @@ pub fn execute(args: []const u8, source: *User) void {
 			action.position[1] + @as(i32, @intCast(action.blueprint.blocks.depth)) - 1,
 			action.position[2] + @as(i32, @intCast(action.blueprint.blocks.height)) - 1,
 		});
-		action.blueprint.paste(action.position);
+		action.blueprint.paste(action.position, .{.preserveVoid = true});
 
 		switch(undo) {
 			.success => |blueprint| {

src/server/command/worldedit/undo.zig

@@ -20,7 +20,7 @@ pub fn execute(args: []const u8, source: *User) void {
 			action.position[1] + @as(i32, @intCast(action.blueprint.blocks.depth)) - 1,
 			action.position[2] + @as(i32, @intCast(action.blueprint.blocks.height)) - 1,
 		});
-		action.blueprint.paste(action.position);
+		action.blueprint.paste(action.position, .{.preserveVoid = true});
 
 		switch(redo) {
 			.success => |blueprint| {