TModLoader Build System Mockup

Build.targets

<?xml version="1.0" encoding="utf-8"?>
<Project>
	
	<PropertyGroup>
		<_TmodOtherFramework Condition="'$(TmodTargetFramework)' == 'XNA'">FNA</_TmodOtherFramework>
		<_TmodOtherFramework Condition="'$(TmodTargetFramework)' == 'FNA'">XNA</_TmodOtherFramework>
		
		<_TmodOtherFrameworkProperties>TmodBuildDllOnly=true;TmodTargetFramework=$(_TmodOtherFramework)</_TmodOtherFrameworkProperties>
	</PropertyGroup>
	
	<Target Name="TmodWarnNoSystem" BeforeTargets="Build" Condition="$(TmodUseSystemReferences) AND '$(TmodSystemFramework)' == ''">
		<Warning Text="TmodUseSystemReferences is set, but no TModLoader installation was found. The build will fall back to packaged references." />
	</Target>
	
	<!-- Invoke Clean and Build targets with the other framework recursively. -->
	
	<Target Name="TmodBuildOtherFramework" BeforeTargets="Build">
		<MSBuild Projects="$(MSBuildProjectFullPath)" Properties="$(_TmodOtherFrameworkProperties)" Targets="Build" />
	</Target>
	
	<Target Name="TmodCleanOtherFramework" BeforeTargets="Clean">
		<MSBuild Projects="$(MSBuildProjectFullPath)" Properties="$(_TmodOtherFrameworkProperties)" Targets="Clean" />
	</Target>
	
</Project>

NewBuildSystemTest.csproj

<?xml version="1.0" encoding="utf-8"?>
<Project Sdk="Microsoft.NET.Sdk">
  <Import Project="Sdk.props" />
  <PropertyGroup>
    <AssemblyName>NewBuildSystemTest</AssemblyName>
    <TargetFramework>net45</TargetFramework>
    <PlatformTarget>x86</PlatformTarget>
    <LangVersion>latest</LangVersion>
	<!--><TmodUseSystemReferences>true</TmodUseSystemReferences><!-->
  </PropertyGroup>
  <Import Project="Sdk.targets" />
</Project>

Sdk.props

<?xml version="1.0" encoding="utf-8"?>
<Project>
	
	<!-- Determine the "primary" build target for the project based on platform.
	     The project can also read this if it needs to something different based on the framework. -->
	<PropertyGroup>
		<TmodTargetFramework Condition="'$(TmodTargetFramework)' == '' AND $([MSBuild]::IsOsPlatform('Windows'))">XNA</TmodTargetFramework>
		<TmodTargetFramework Conditiosn="'$(TmodTargetFramework)' == ''">FNA</TmodTargetFramework>
	</PropertyGroup>
	
	<!-- Detect TModLoader paths here, in case the project needs them for something. -->
	<PropertyGroup>
		<TmodSavePath Condition="'$(tmodSavePath)' == '' AND $([MSBuild]::IsOsPlatform('Windows'))">$(registry:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders@Personal)\My Games\Terraria\ModLoader</TmodSavePath>
		<TmodSavePath Condition="'$(tmodSavePath)' == '' AND $([MSBuild]::IsOsPlatform('Linux')) AND '$(XDG_DATA_HOME)' != ''">$(XDG_DATA_HOME)/.local/share/Terraria/ModLoader</TmodSavePath>
		<TmodSavePath Condition="'$(tmodSavePath)' == '' AND $([MSBuild]::IsOsPlatform('Linux'))">$(HOME)/.local/share/Terraria/ModLoader</TmodSavePath>
		<TmodSavePath Condition="'$(tmodSavePath)' == '' AND $([MSBuild]::IsOsPlatform('OSX'))">$(HOME)/Library/Application Support/Terraria/ModLoader</TmodSavePath>
		
		<TmodReferenceTargetPath Condition="'$(TmodReferenceTargetPath)' == ''">$(tmodSavePath)/References/tModLoader.targets</TmodReferenceTargetPath>
	</PropertyGroup>
	
	<!-- This can be set to true by the project to force the use of the installed references. -->
	<PropertyGroup>
		<TmodUseSystemReferences Condition="'$(TmodUseSystemReferences)' == ''">false</TmodUseSystemReferences>
	</PropertyGroup>
	
	<!-- Detect the version of the installed references. ('XNA', 'FNA', or '' for none detected) -->
	<PropertyGroup Condition="Exists('$(TmodReferenceTargetPath)')">
		<TmodSystemFramework Condition="$([MSBuild]::IsOsPlatform('Windows'))">XNA</TmodSystemFramework>
		<TmodSystemFramework Condition="'$(TmodTargetFramework)' == ''">FNA</TmodSystemFramework>
	</PropertyGroup>
	
	<!-- Different output folders for the different frameworks. -->
	<PropertyGroup>
		<OutputPath>bin/$(Configuration)/$(TmodTargetFramework)/</OutputPath>
		<IntermediateOutputPath>$(BaseIntermediateOutputPath)$(Configuration)/$(TmodTargetFramework)/</IntermediateOutputPath>
	</PropertyGroup>
	
</Project>

Sdk.targets

<?xml version="1.0" encoding="utf-8"?>
<Project>

	<PropertyGroup>
		<_TmodBuildWithSystem>false</_TmodBuildWithSystem>
		<_TmodBuildWithSystem Condition="$(TmodUseSystemReferences) AND '$(TmodTargetFramework)' == '$(TmodSystemFramework)'">true</_TmodBuildWithSystem>
	</PropertyGroup>

	<!-- Import the installed references. -->
	<Import Condition="$(_TmodBuildWithSystem)" Project="$(tmodSavePath)/References/tModLoader.targets" />
	
	<!-- Add XNA references from the NuGet package. -->
	<ItemGroup Condition="!$(_TmodBuildWithSystem) AND '$(TmodTargetFramework)' == 'XNA'">
		<Reference Include="DummyXNA">
			<HintPath>./DummyXNA.dll</HintPath>
		</Reference>
	</ItemGroup>
	
	<!-- Add FNA references from the NuGet package. -->
	<ItemGroup Condition="!$(_TmodBuildWithSystem) AND '$(TmodTargetFramework)' == 'FNA'">
		<Reference Include="DummyFNA">
			<HintPath>./DummyFNA.dll</HintPath>
		</Reference>
	</ItemGroup>
	
	<!-- Import the build target conditionally, to avoid circular dependency graph. -->
	<Import Condition="'$(TmodBuildDllOnly)' != 'true'" Project="Build.targets" />
	
</Project>