Directory.Build.targets

<Project>

    <PropertyGroup>
        <!-- Default PKHeX source paths per OS; override with -p:PKHeXSourcePath=... -->
        <PKHeXSourcePath Condition="'$(PKHeXSourcePath)' == '' And $([MSBuild]::IsOsPlatform('Windows'))">C:\Code\PKHeX\PKHeX.Core\PKHeX.Core.csproj</PKHeXSourcePath>
        <PKHeXSourcePath Condition="'$(PKHeXSourcePath)' == ''">$(HOME)/Code/codemonkey85/PKHeX/PKHeX.Core/PKHeX.Core.csproj</PKHeXSourcePath>
    </PropertyGroup>

    <!-- Detect whether this project directly references PKHeX.Core so we only swap
         projects that actually consume it. Without this guard the ItemGroup below
         runs for every project that imports Directory.Build.targets, unnecessarily
         coupling them to the local PKHeX checkout.
         We build a sentinel-delimited string from the PackageReference identity list
         and use a property function Contains check to avoid MSBuild restrictions on
         built-in metadata (%(Identity)) in item element conditions (MSB4190). -->
    <PropertyGroup Condition="'$(UseLocalPKHeX)' == 'true'">
        <_PKHeXCoreSentinel>;@(PackageReference->'%(Identity)');</_PKHeXCoreSentinel>
        <_HasPKHeXCoreRef Condition="$(_PKHeXCoreSentinel.Contains(';PKHeX.Core;'))">true</_HasPKHeXCoreRef>
    </PropertyGroup>

    <!-- Swap NuGet PKHeX.Core for a local project reference.
         Usage: dotnet build ... -p:UseLocalPKHeX=true
         Override path: -p:PKHeXSourcePath=/path/to/PKHeX.Core.csproj -->
    <ItemGroup Condition="'$(UseLocalPKHeX)' == 'true' And '$(_HasPKHeXCoreRef)' == 'true'">
        <PackageReference Remove="PKHeX.Core"/>
        <ProjectReference Include="$(PKHeXSourcePath)"/>
    </ItemGroup>

</Project>