Show portals in look output

Look command now displays portals separately from ground items.
Portals at the player's position are shown after ground items with
the format "Portals: name1, name2". This separates portals from
regular items since they serve a different purpose in gameplay.

src/mudlib/commands/look.py

@@ -103,13 +103,24 @@ async def cmd_look(player: Player, args: str) -> None:
     player.writer.write("\r\n".join(output_lines) + "\r\n")
 
     # Show items on the ground at player's position
+    from mudlib.portal import Portal
+
+    contents_here = zone.contents_at(player.x, player.y)
     ground_items = [
-        obj for obj in zone.contents_at(player.x, player.y) if isinstance(obj, Thing)
+        obj
+        for obj in contents_here
+        if isinstance(obj, Thing) and not isinstance(obj, Portal)
     ]
+    portals = [obj for obj in contents_here if isinstance(obj, Portal)]
+
     if ground_items:
         names = ", ".join(_format_thing_name(item) for item in ground_items)
         player.writer.write(f"On the ground: {names}\r\n")
 
+    if portals:
+        names = ", ".join(p.name for p in portals)
+        player.writer.write(f"Portals: {names}\r\n")
+
     await player.writer.drain()
 
 

tests/test_portal_display.py

@@ -0,0 +1,118 @@
+"""Tests for portal display in look command."""
+
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+
+from mudlib.player import Player
+from mudlib.portal import Portal
+from mudlib.zone import Zone
+
+
+@pytest.fixture
+def mock_writer():
+    writer = MagicMock()
+    writer.write = MagicMock()
+    writer.drain = AsyncMock()
+    return writer
+
+
+@pytest.fixture
+def mock_reader():
+    return MagicMock()
+
+
+@pytest.fixture
+def test_zone():
+    terrain = [["." for _ in range(10)] for _ in range(10)]
+    return Zone(
+        name="testzone",
+        width=10,
+        height=10,
+        toroidal=True,
+        terrain=terrain,
+    )
+
+
+@pytest.fixture
+def player(mock_reader, mock_writer, test_zone):
+    p = Player(
+        name="TestPlayer",
+        x=5,
+        y=5,
+        reader=mock_reader,
+        writer=mock_writer,
+        location=test_zone,
+    )
+    return p
+
+
+@pytest.mark.asyncio
+async def test_look_shows_portal_at_position(player, test_zone, mock_writer):
+    """look command shows portals at player position."""
+    from mudlib.commands.look import cmd_look
+
+    Portal(
+        name="shimmering doorway",
+        location=test_zone,
+        x=5,
+        y=5,
+        target_zone="elsewhere",
+        target_x=0,
+        target_y=0,
+    )
+
+    await cmd_look(player, "")
+    output = "".join([call[0][0] for call in mock_writer.write.call_args_list])
+    assert "portal" in output.lower() and "shimmering doorway" in output.lower()
+
+
+@pytest.mark.asyncio
+async def test_look_shows_multiple_portals(player, test_zone, mock_writer):
+    """look command shows multiple portals at player position."""
+    from mudlib.commands.look import cmd_look
+
+    Portal(
+        name="red portal",
+        location=test_zone,
+        x=5,
+        y=5,
+        target_zone="redzone",
+        target_x=0,
+        target_y=0,
+    )
+    Portal(
+        name="blue portal",
+        location=test_zone,
+        x=5,
+        y=5,
+        target_zone="bluezone",
+        target_x=0,
+        target_y=0,
+    )
+
+    await cmd_look(player, "")
+    output = "".join([call[0][0] for call in mock_writer.write.call_args_list])
+    assert "red portal" in output.lower()
+    assert "blue portal" in output.lower()
+
+
+@pytest.mark.asyncio
+async def test_look_no_portals_at_position(player, test_zone, mock_writer):
+    """look command doesn't show portals when none at position."""
+    from mudlib.commands.look import cmd_look
+
+    Portal(
+        name="distant portal",
+        location=test_zone,
+        x=8,
+        y=8,
+        target_zone="elsewhere",
+        target_x=0,
+        target_y=0,
+    )
+
+    await cmd_look(player, "")
+    output = "".join([call[0][0] for call in mock_writer.write.call_args_list])
+    # Should not mention portals when none are at player position
+    assert "portal" not in output.lower() or "distant portal" not in output.lower()