RPG world mod: tile maps, grid walking, map events, battles

Maps of square tiles in three layers plus a collision layer, mounted over
the 2D shell when their scene is entered. WASD walking, E/F action events,
touch teleports, story-flag conditions, random encounters, rpg.battle and
rpg.teleport actions, position saving. Integration suite rpg_walk.

test_suites/walk/src/RpgWalkTestInitializer.cs

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+using System.Linq;
+using Cthangover.Core.Mods;
+using Cthangover.Core.Utils;
+using Godot;
+
+namespace Cthangover.Mods.Rpg.Tests
+{
+    /// <summary>
+    /// Entry point of the rpg_walk integration test: adds the driver to the tree
+    /// root when the exact flag <c>--itest=rpg_walk</c> is given (the driver
+    /// quits the process, so it must never run in another test). Optional
+    /// <c>--shots=&lt;dir&gt;</c> makes the driver save screenshots.
+    /// </summary>
+    public class RpgWalkTestInitializer : IModInitializer
+    {
+        private static bool driverQueued;
+
+        /// <summary>Nothing per mod.</summary>
+        public void OnModLoaded(string modId)
+        {
+        }
+
+        /// <summary>Queues the driver once.</summary>
+        public void OnModResourcesReady()
+        {
+            var args = OS.GetCmdlineUserArgs();
+            if (driverQueued || !args.Any(a => a == "--itest=rpg_walk"))
+                return;
+
+            driverQueued = true;
+            var shots = args.Where(a => a.StartsWith("--shots=", System.StringComparison.Ordinal))
+                .Select(a => a.Substring("--shots=".Length))
+                .FirstOrDefault();
+            GameLogger.Log("TEST", $"RpgWalkTestInitializer: activating rpg_walk, shots={shots ?? "off"}");
+            (Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new RpgWalkTestDriver(shots));
+        }
+    }
+}