From 8cade32be7a70289e54f1739ca16f8bff4e67106 Mon Sep 17 00:00:00 2001
From: Sadeq Abu-Hattem <sadegabuhattem@gmail.com>
Date: Thu, 5 Nov 2026 21:12:47 +0200
Subject: [PATCH] Build against the sibling library repos when the local
 workspace exists

While ../DotNetBoost.Workspace.slnx exists, Directory.Build.targets turns
every DotNetBoost.* PackageReference whose project is in a sibling
repo's src/ folder (dotnetboost-settings, -media, -multilingual,
-auditing) into a ProjectReference to it. A library whose folder is
missing stays a package. Package ids equal project names in all four
repos, which is what the swap relies on.

It keys on the workspace file existing rather than $(SolutionFileName),
so `dotnet run --project` and the IDE behave the same as building the
workspace. CI checks out this repo alone, never has the file, and keeps
building against the packages pinned in Directory.Packages.props. One
build can opt out with -p:UseLocalDotNetBoost=false; deleting the
workspace file turns it off for good.

Verified: in the workspace, every DotNetBoost library (including the
transitive ones) resolves as a project and the tests (160) pass; with
the opt-out they resolve as the nuget.org packages and still pass; and
a copy of the repo outside the workspace evaluates with the switch off
and all seven Infrastructure package references intact.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 Directory.Build.targets | 43 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 Directory.Build.targets

diff --git a/Directory.Build.targets b/Directory.Build.targets
new file mode 100644
index 0000000..d213721
--- /dev/null
+++ b/Directory.Build.targets
@@ -0,0 +1,43 @@
+<Project>
+
+  <!--
+    Local workspace switch: use the DotNetBoost libraries' source instead of the nuget.org packages.
+
+    It turns on only when ../DotNetBoost.Workspace.slnx exists, i.e. on a machine where this repo
+    sits next to the library repos (dotnetboost-settings, -media, -multilingual, -auditing). CI
+    checks out this repo alone, so there is no such file and every build there uses the
+    published packages pinned in Directory.Packages.props.
+
+    When on, each DotNetBoost.* PackageReference whose project exists in a sibling repo's src/
+    folder becomes a ProjectReference to it; any package without a local project stays a
+    PackageReference. Works the same from the IDE, dotnet build, dotnet run and dotnet test.
+
+    Build against nuget.org while the workspace exists:  dotnet build -p:UseLocalDotNetBoost=false
+    Turn it off for good: delete ../DotNetBoost.Workspace.slnx.
+  -->
+
+  <PropertyGroup>
+    <DotNetBoostWorkspaceRoot>$([System.IO.Path]::GetFullPath('$(MSBuildThisFileDirectory)..'))/</DotNetBoostWorkspaceRoot>
+    <UseLocalDotNetBoost Condition="'$(UseLocalDotNetBoost)' == '' and Exists('$(DotNetBoostWorkspaceRoot)DotNetBoost.Workspace.slnx')">true</UseLocalDotNetBoost>
+  </PropertyGroup>
+
+  <ItemGroup Condition="'$(UseLocalDotNetBoost)' == 'true'">
+    <!-- Every library project available locally. Package ids equal project names in all four repos. -->
+    <_DotNetBoostLocalProject Include="$(DotNetBoostWorkspaceRoot)dotnetboost-settings/src/DotNetBoost.*/*.csproj;
+                                       $(DotNetBoostWorkspaceRoot)dotnetboost-media/src/DotNetBoost.*/*.csproj;
+                                       $(DotNetBoostWorkspaceRoot)dotnetboost-multilingual/src/DotNetBoost.*/*.csproj;
+                                       $(DotNetBoostWorkspaceRoot)dotnetboost-auditing/src/DotNetBoost.*/*.csproj"
+                              ProjectPath="%(FullPath)" />
+    <_DotNetBoostLocalId Include="@(_DotNetBoostLocalProject->'%(Filename)')" />
+
+    <!-- Keep only the ids this project actually references: local - (local - referenced). -->
+    <_DotNetBoostUnreferenced Include="@(_DotNetBoostLocalId)" />
+    <_DotNetBoostUnreferenced Remove="@(PackageReference)" />
+    <_DotNetBoostSwapped Include="@(_DotNetBoostLocalId)" />
+    <_DotNetBoostSwapped Remove="@(_DotNetBoostUnreferenced)" />
+
+    <PackageReference Remove="@(_DotNetBoostSwapped)" />
+    <ProjectReference Include="@(_DotNetBoostSwapped->'%(ProjectPath)')" />
+  </ItemGroup>
+
+</Project>