Basic hot reload support for mod development

Assembly-CSharp/Assembly-CSharp.csproj

@@ -27,6 +27,11 @@
 
     <PropertyGroup>
         <OutputDir>$(SolutionDir)/OutputFinal</OutputDir>
+        <!-- todo macOS -->
+        <GamePath Condition="'$(OS)' == 'Windows_NT'">C:/Program Files (x86)/Steam/steamapps/common/Hollow Knight</GamePath>
+        <GamePath Condition="'$(OS)' != 'Windows_NT'">$(HOME)/.local/share/Steam/steamapps/common/Hollow Knight</GamePath>
+        <CopyDir>$(GamePath)/hollow_knight_Data/Managed</CopyDir>
+
         <Mono Condition="$(OS) == WINDOWS_NT" />
         <Mono Condition="$(OS) != WINDOWS_NT">mono</Mono>
     </PropertyGroup>
@@ -78,6 +83,13 @@
         <Copy SourceFiles="@(Dependencies)" DestinationFolder="$(OutputDir)" />
     </Target>
 
+    <Target Name="CopyOutputAfterFinal" AfterTargets="OutputFinal" Condition="'$(CopyDir)' != ''">
+        <ItemGroup>
+            <OutputFiles Include="$(OutputDir)\**\*" />
+        </ItemGroup>
+        <Copy SourceFiles="@(OutputFiles)" DestinationFolder="$(CopyDir)" />
+    </Target>
+
     <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
         <DebugType>full</DebugType>
         <DocumentationFile>bin\$(Configuration)\Assembly-CSharp.mm.xml</DocumentationFile>

Assembly-CSharp/Mod.cs

@@ -110,13 +110,16 @@ private string GetGlobalSettingsPath()
             string globalSettingsFileName = $"{GetType().Name}.GlobalSettings.json";
 
             string location = GetType().Assembly.Location;
-            string directory = Path.GetDirectoryName(location);
-            string globalSettingsOverride = Path.Combine(directory, globalSettingsFileName);
+            if (string.IsNullOrEmpty(location))
+            { // TODO: not set while hot reloading
+                string directory = Path.GetDirectoryName(location);
+                string globalSettingsOverride = Path.Combine(directory, globalSettingsFileName);
 
-            if (File.Exists(globalSettingsOverride))
-            {
-                Log("Overriding Global Settings path with Mod directory");
-                return globalSettingsOverride;
+                if (File.Exists(globalSettingsOverride))
+                {
+                    Log("Overriding Global Settings path with Mod directory");
+                    return globalSettingsOverride;
+                }
             }
 
             return Path.Combine(Application.persistentDataPath, globalSettingsFileName);

Assembly-CSharp/ModHooksGlobalSettings.cs

@@ -44,6 +44,24 @@ public class ModHooksGlobalSettings
         /// </summary>
         public int PreloadBatchSize = 5;
 
+        /// <summary>
+        ///     When enabled, listens for filesystem changes to mod DLLs.
+        ///     On modification, mods will be unloaded, and the new copy of the assembly gets loaded as well.
+        ///     <para><b>Limitations:</b></para>
+        ///     <list type="bullet">
+        ///         <item><description>
+        ///             The old assembly does not get unloaded. If you have created any unity game objects or components,
+        ///             make sure to Destroy them in the mod's Unload function.
+        ///         </description></item>k
+        ///         <item><description>
+        ///             Dependencies of mods cannot be hot reloaded. When you modify a dependency DLL, no change will be made to the mod depending on it.
+        ///         </description></item>
+        ///         <item><description>
+        ///             <c>Assembly.location</c> will return an empty string for hot-reloaded mods
+        ///         </description></item>
+        ///     </list>
+        /// </summary>
+        public bool EnableHotReload = false;
 
         /// <summary>
         ///     Maximum number of days to preserve modlogs for.