single argument print(foo) in player scoped apps will always target the player instance for chat message output.

docs/scarpet/api/Auxiliary.md

@@ -245,6 +245,7 @@ produce an exception.
 ### `print(expr)`, `print(player/player_list, expr)`
 
 Displays the result of the expression to the chat. Overrides default `scarpet` behaviour of sending everything to stderr.
+For player scoped apps it always by default targets the player for whom the app runs on behalf. 
 Can optionally define player or list of players to send the message to.
 
 ### `format(components, ...)`, `format([components, ...])`

src/main/java/carpet/script/api/Auxiliary.java

@@ -505,25 +505,31 @@ public class Auxiliary
             {
                 throw new InternalExpressionException("'print' takes one or two arguments");
             }
-            CommandSourceStack s = ((CarpetContext) c).source();
+            CarpetContext cc = (CarpetContext) c;
+            CommandSourceStack s = cc.source();
             MinecraftServer server = s.getServer();
             Value res = lv.get(0);
-            List<ServerPlayer> targets = null;
+            List<CommandSourceStack> targets = null;
             if (lv.size() == 2)
             {
                 List<Value> playerValues = (res instanceof ListValue list) ? list.getItems() : Collections.singletonList(res);
-                List<ServerPlayer> playerTargets = new ArrayList<>();
+                List<CommandSourceStack> playerTargets = new ArrayList<>();
                 playerValues.forEach(pv -> {
                     ServerPlayer player = EntityValue.getPlayerByValue(server, pv);
                     if (player == null)
                     {
                         throw new InternalExpressionException("Cannot target player " + pv.getString() + " in print");
                     }
-                    playerTargets.add(player);
+                    playerTargets.add(player.createCommandSourceStack());
                 });
                 targets = playerTargets;
                 res = lv.get(1);
+            } else if (c.host.user != null) {
+                ServerPlayer player = cc.server().getPlayerList().getPlayerByName(cc.host.user);
+                if (player != null) {
+                    targets = Collections.singletonList(player.createCommandSourceStack());
                 }
+            } // optionally retrieve from CC.host.responsibleSource to print?
             Component message = FormattedTextValue.getTextByValue(res);
             if (targets == null)
             {
@@ -531,7 +537,7 @@ public class Auxiliary
             }
             else
             {
-                targets.forEach(p -> p.createCommandSourceStack().sendSuccess(message, false));
+                targets.forEach(p -> p.sendSuccess(message, false));
             }
             return res; // pass through for variables
         });