add playerIndex option to spawn command (#2808)

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

Author: Wunka

src/server/command/_command.zig

@@ -102,7 +102,7 @@ pub const Target = struct {
 				source.sendMessage("#ff0000Too few arguments for command", .{});
 				return error.TooFewArguments;
 			};
-			if (userIndex[0] == '@') {
+			if (userIndex.len > 0 and userIndex[0] == '@') {
 				const user = parsePlayerIndexAndIncreaseRefCount(userIndex, source) catch return error.InvalidArgs;
 				increasedRefCount = true;
 				_ = split.next();

src/server/command/spawn.zig

@@ -5,17 +5,21 @@ const User = main.server.User;
 
 const command = @import("_command.zig");
 
-pub const description = "Get or set the player / world spawn point";
+pub const description = "Get or set a player's / the world spawn point";
 pub const usage =
 	\\/spawn
 	\\/spawn <x> <y> <z>
+	\\/spawn @<playerIndex>
+	\\/spawn @<playerIndex> <x> <y> <z>
 	\\/spawn world
 	\\/spawn world <x> <y> <z>
 ;
 
 pub fn execute(args: []const u8, source: *User) void {
 	var split = std.mem.splitScalar(u8, args, ' ');
-	if (split.peek().?.len > 0) {
+	const target = command.Target.init(&split, source) catch return;
+	defer target.deinit();
+	if (split.peek() != null and split.peek().?.len > 0) {
 		if (std.mem.eql(u8, split.peek().?, "world")) {
 			_ = split.next();
 			if (split.peek() == null or split.peek().?.len == 0) {
@@ -38,8 +42,8 @@ pub fn execute(args: []const u8, source: *User) void {
 			source.sendMessage("#ff0000Too many arguments for command /spawn", .{});
 			return;
 		}
-		source.spawnPos = pos;
+		target.user.spawnPos = pos;
 	} else {
-		source.sendMessage("#ffff00{}", .{source.getSpawnPos()});
+		source.sendMessage("#ffff00{}", .{target.user.getSpawnPos()});
 	}
 }