Add portal loading from zone TOML files

Zone TOML files can now define portals using [[portals]] sections.
Each portal specifies coordinates (x, y), a target (zone_name:x,y),
and a label. Optional aliases are supported. Portals are
automatically created and placed in the zone when it loads.

src/mudlib/zones.py

@@ -6,6 +6,7 @@ import logging
 import tomllib
 from pathlib import Path
 
+from mudlib.portal import Portal
 from mudlib.zone import Zone
 
 log = logging.getLogger(__name__)
@@ -77,6 +78,36 @@ def load_zone(path: Path) -> Zone:
         spawn_y=spawn_y,
     )
 
+    # Load portals
+    portals_data = data.get("portals", [])
+    for portal_dict in portals_data:
+        # Parse target string "zone_name:x,y"
+        target = portal_dict["target"]
+        try:
+            target_zone, coords = target.split(":")
+            target_x, target_y = map(int, coords.split(","))
+        except ValueError:
+            log.warning(
+                "skipping portal '%s' at (%d, %d): malformed target '%s'",
+                portal_dict["label"],
+                portal_dict["x"],
+                portal_dict["y"],
+                target,
+            )
+            continue
+
+        # Create portal (automatically added to zone._contents via Object.__post_init__)
+        Portal(
+            name=portal_dict["label"],
+            aliases=portal_dict.get("aliases", []),
+            target_zone=target_zone,
+            target_x=target_x,
+            target_y=target_y,
+            location=zone,
+            x=portal_dict["x"],
+            y=portal_dict["y"],
+        )
+
     return zone
 
 

tests/test_zone_loading.py

@@ -211,3 +211,143 @@ rows = [
         assert zone.spawn_y == 0
     finally:
         temp_path.unlink()
+
+
+def test_load_zone_with_portals():
+    """Load a zone with portals defined."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".toml", delete=False) as f:
+        f.write("""
+name = "portal_zone"
+description = "a zone with portals"
+width = 10
+height = 10
+
+[terrain]
+rows = [
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+    "..........",
+]
+
+[[portals]]
+x = 5
+y = 3
+target = "tavern:1,1"
+label = "tavern door"
+
+[[portals]]
+x = 2
+y = 7
+target = "forest:10,5"
+label = "forest path"
+""")
+        temp_path = pathlib.Path(f.name)
+
+    try:
+        zone = load_zone(temp_path)
+
+        # Find portals in zone contents
+        portals = [obj for obj in zone._contents if obj.__class__.__name__ == "Portal"]
+        assert len(portals) == 2
+
+        # Check first portal (tavern door at 5,3)
+        tavern_portal = [p for p in portals if p.name == "tavern door"][0]
+        assert tavern_portal.x == 5
+        assert tavern_portal.y == 3
+        assert tavern_portal.target_zone == "tavern"
+        assert tavern_portal.target_x == 1
+        assert tavern_portal.target_y == 1
+        assert tavern_portal.location == zone
+
+        # Check second portal (forest path at 2,7)
+        forest_portal = [p for p in portals if p.name == "forest path"][0]
+        assert forest_portal.x == 2
+        assert forest_portal.y == 7
+        assert forest_portal.target_zone == "forest"
+        assert forest_portal.target_x == 10
+        assert forest_portal.target_y == 5
+        assert forest_portal.location == zone
+
+        # Verify portals are at correct coordinates
+        contents_at_5_3 = zone.contents_at(5, 3)
+        assert tavern_portal in contents_at_5_3
+
+        contents_at_2_7 = zone.contents_at(2, 7)
+        assert forest_portal in contents_at_2_7
+    finally:
+        temp_path.unlink()
+
+
+def test_load_zone_without_portals():
+    """Load a zone without portals section works fine."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".toml", delete=False) as f:
+        f.write("""
+name = "no_portals"
+description = "a zone without portals"
+width = 3
+height = 3
+
+[terrain]
+rows = [
+    "...",
+    "...",
+    "...",
+]
+""")
+        temp_path = pathlib.Path(f.name)
+
+    try:
+        zone = load_zone(temp_path)
+
+        # Should have no portals
+        portals = [obj for obj in zone._contents if obj.__class__.__name__ == "Portal"]
+        assert len(portals) == 0
+    finally:
+        temp_path.unlink()
+
+
+def test_load_zone_portal_with_aliases():
+    """Portal can have optional aliases field in TOML."""
+    with tempfile.NamedTemporaryFile(mode="w", suffix=".toml", delete=False) as f:
+        f.write("""
+name = "alias_zone"
+description = "a zone with aliased portal"
+width = 5
+height = 5
+
+[terrain]
+rows = [
+    ".....",
+    ".....",
+    ".....",
+    ".....",
+    ".....",
+]
+
+[[portals]]
+x = 2
+y = 2
+target = "elsewhere:0,0"
+label = "mysterious gateway"
+aliases = ["gateway", "gate", "portal"]
+""")
+        temp_path = pathlib.Path(f.name)
+
+    try:
+        zone = load_zone(temp_path)
+
+        portals = [obj for obj in zone._contents if obj.__class__.__name__ == "Portal"]
+        assert len(portals) == 1
+
+        portal = portals[0]
+        assert portal.name == "mysterious gateway"
+        assert portal.aliases == ["gateway", "gate", "portal"]
+    finally:
+        temp_path.unlink()