Account for relative coordinates in PlaySound. Fixes BUKKIT-4639

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/command/defaults/PlaySoundCommand.java

@@ -29,7 +29,7 @@ public class PlaySoundCommand extends VanillaCommand {
 
         final Player player = Bukkit.getPlayerExact(playerArg);
         if (player == null) {
-            sender.sendMessage(ChatColor.RED + "Can't find player %s" + playerArg);
+            sender.sendMessage(ChatColor.RED + "Can't find player " + playerArg);
             return false;
         }
 
@@ -51,11 +51,11 @@ public class PlaySoundCommand extends VanillaCommand {
         case 6:
             volume = getDouble(sender, args[5], 0.0D, Float.MAX_VALUE);
         case 5:
-            z = getDouble(sender, args[4]);
+            z = getRelativeDouble(z, sender, args[4]);
         case 4:
-            y = getDouble(sender, args[3]);
+            y = getRelativeDouble(y, sender, args[3]);
         case 3:
-            x = getDouble(sender, args[2]);
+            x = getRelativeDouble(x, sender, args[2]);
         case 2:
             // Noop
         }

paper-api/src/main/java/org/bukkit/command/defaults/VanillaCommand.java

@@ -58,6 +58,18 @@ public abstract class VanillaCommand extends Command {
         }
     }
 
+    public static double getRelativeDouble(double original, CommandSender sender, String input) {
+        if (input.startsWith("~")) {
+            double value = getDouble(sender, input.substring(1));
+            if (value == MIN_COORD_MINUS_ONE) {
+                return MIN_COORD_MINUS_ONE;
+            }
+            return original + value;
+        } else {
+            return getDouble(sender, input);
+        }
+    }
+
     public static double getDouble(CommandSender sender, String input) {
         try {
             return Double.parseDouble(input);