build: let FAKE write the assembly information as MSBuild properties

Directory.Build.props

@@ -29,7 +29,6 @@ See https://learn.microsoft.com/en-us/visualstudio/msbuild/customize-by-director
     <Nullable>enable</Nullable>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
-    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
 
   <ItemGroup>

Directory.Packages.props

@@ -19,7 +19,6 @@
     <PackageVersion Include="Fake.Core.Process" Version="6.2.0" />
     <PackageVersion Include="Fake.Core.ReleaseNotes" Version="6.2.0" />
     <PackageVersion Include="Fake.Core.Target" Version="6.2.0" />
-    <PackageVersion Include="Fake.DotNet.AssemblyInfoFile" Version="6.2.0" />
     <PackageVersion Include="Fake.DotNet.Cli" Version="6.2.0" />
     <PackageVersion Include="Fake.DotNet.Paket" Version="6.2.0" />
     <PackageVersion Include="Fake.IO.FileSystem" Version="6.2.0" />

README.md

@@ -79,7 +79,7 @@ or
 - `GenerateCoverageReport` - Code coverage is run during `DotnetTest` and this generates a report via [ReportGenerator](https://github.com/danielpalme/ReportGenerator).
 - `ShowCoverageReport` - Shows the report generated in `GenerateCoverageReport`.
 - `WatchTests` - Runs [dotnet watch](https://docs.microsoft.com/en-us/aspnet/core/tutorials/dotnet-watch?view=aspnetcore-3.0) with the test projects. Useful for rapid feedback loops.
-- `GenerateAssemblyInfo` - Generates [AssemblyInfo](https://docs.microsoft.com/en-us/dotnet/api/microsoft.visualbasic.applicationservices.assemblyinfo?view=netframework-4.8) for libraries.
+- `GenerateAssemblyInfo` - Writes the version, the release date, the release channel and the git hash of the latest changelog entry into `src/AssemblyInfo.Build.props`, which `src/Directory.Build.props` imports, so that the SDK generates the assembly attributes of the libraries from it.
 - `DotnetPack` - Runs [dotnet pack](https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-pack). This includes running [Source Link](https://github.com/dotnet/sourcelink).
 - `SourceLinkTest` - Runs a Source Link test tool to verify Source Links were properly generated.
 - `PublishToNuGet` - Publishes the NuGet packages generated in `DotnetPack` to NuGet via [dotnet nuget push](https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-nuget-push). Runs only from `Github Actions`.

build/build.fs

@@ -1,4 +1,5 @@
 open System
+open System.Xml.Linq
 open Fake.Core
 open Fake.DotNet
 open Fake.Tools
@@ -28,6 +29,9 @@ let rootDirectory = __SOURCE_DIRECTORY__ </> ".."
 
 let productName = "FSharp.Collections.Immutable"
 
+/// The assembly information of the release. `src/Directory.Build.props` imports it, so that the SDK generates the attributes.
+let assemblyInfoPropsPath = rootDirectory </> "src" </> "AssemblyInfo.Build.props"
+
 let sln = rootDirectory </> "FSharp.Collections.Immutable.slnf"
 
 let srcCodeGlob =
@@ -432,47 +436,90 @@ let watchTests _ =
 
     cancelEvent.Cancel <- true
 
+/// Writes the assembly information of the latest changelog entry in two places. `src/AssemblyInfo.Build.props` holds
+/// the properties and the `AssemblyMetadata` items from which the SDK generates the assembly attributes, and
+/// `src/Directory.Build.props` imports it, so a project sets only what is specific to it in its own project file.
+/// `AssemblyInfo.fs` of each F# project in `src` holds the literals of `AssemblyVersionInformation`, which the code can
+/// use at compile time. It has no attributes, because the SDK generates them.
 let generateAssemblyInfo _ =
 
-    let (|Fsproj|Csproj|Vbproj|) (projFileName : string) =
-        match projFileName with
-        | f when f.EndsWith ("fsproj") -> Fsproj
-        | f when f.EndsWith ("csproj") -> Csproj
-        | f when f.EndsWith ("vbproj") -> Vbproj
-        | _ -> failwithf "Project file %s not supported. Unknown project type." projFileName
-
     let releaseChannel =
         match latestEntry.SemVer.PreRelease with
         | Some pr -> pr.Name
         | _ -> "release"
 
-    let getAssemblyInfoAttributes projectName = [
-        AssemblyInfo.Title (projectName)
-        AssemblyInfo.Product productName
-        AssemblyInfo.Version latestEntry.AssemblyVersion
-        // The date is optional in a changelog entry
-        match latestEntry.Date with
-        | Some releaseDate -> AssemblyInfo.Metadata ("ReleaseDate", releaseDate.ToString ("o"))
+    // The date is optional in a changelog entry
+    let releaseDate = latestEntry.Date |> Option.map _.ToString("o")
+    let gitHash = Git.Information.getCurrentSHA1 (null)
+
+    let metadata = [
+        match releaseDate with
+        | Some date -> "ReleaseDate", date
         | None -> ()
-        AssemblyInfo.FileVersion latestEntry.AssemblyVersion
-        AssemblyInfo.InformationalVersion latestEntry.AssemblyVersion
-        AssemblyInfo.Metadata ("ReleaseChannel", releaseChannel)
-        AssemblyInfo.Metadata ("GitHash", Git.Information.getCurrentSHA1 (null))
+        "ReleaseChannel", releaseChannel
+        "GitHash", gitHash
     ]
 
-    let getProjectDetails (projectPath : string) =
-        let projectName = IO.Path.GetFileNameWithoutExtension (projectPath)
+    let properties =
+        XElement (
+            "PropertyGroup",
+            XElement ("Product", productName),
+            XElement ("AssemblyVersion", latestEntry.AssemblyVersion),
+            XElement ("FileVersion", latestEntry.AssemblyVersion),
+            XElement ("InformationalVersion", latestEntry.AssemblyVersion),
+            // The git hash is in the metadata, so the SDK must not append the source revision to the informational version
+            XElement ("IncludeSourceRevisionInInformationalVersion", "false")
+        )
 
-        (projectPath, projectName, IO.Path.GetDirectoryName (projectPath), (getAssemblyInfoAttributes projectName))
+    let items =
+        XElement (
+            "ItemGroup",
+            metadata
+            |> List.map (fun (key, value) ->
+                XElement ("AssemblyMetadata", XAttribute ("Include", key), XAttribute ("Value", value))
+            )
+        )
 
-    !!srcGlob
-    |> Seq.map getProjectDetails
-    |> Seq.iter (fun (projFileName, _, folderName, attributes) ->
-        match projFileName with
-        | Fsproj -> AssemblyInfoFile.createFSharp (folderName </> "AssemblyInfo.fs") attributes
-        | Csproj -> AssemblyInfoFile.createCSharp ((folderName </> "Properties") </> "AssemblyInfo.cs") attributes
-        | Vbproj -> AssemblyInfoFile.createVisualBasic ((folderName </> "My Project") </> "AssemblyInfo.vb") attributes
-    )
+    let props =
+        XDocument (XComment " Auto-Generated by FAKE; do not edit ", XElement ("Project", properties, items))
+
+    // XDocument breaks lines as the operating system does, and the other generated file has "\n" everywhere
+    let propsText = props.ToString().ReplaceLineEndings "\n"
+
+    File.writeString false assemblyInfoPropsPath $"%s{propsText}\n"
+
+    let versionInformation projectName =
+        let literals = [
+            "AssemblyTitle", projectName
+            "AssemblyProduct", productName
+            "AssemblyVersion", latestEntry.AssemblyVersion
+            match releaseDate with
+            | Some date -> "AssemblyMetadata_ReleaseDate", date
+            | None -> ()
+            "AssemblyFileVersion", latestEntry.AssemblyVersion
+            "AssemblyInformationalVersion", latestEntry.AssemblyVersion
+            "AssemblyMetadata_ReleaseChannel", releaseChannel
+            "AssemblyMetadata_GitHash", gitHash
+        ]
+
+        [
+            "// Auto-Generated by FAKE; do not edit"
+            "namespace System"
+            ""
+            "module internal AssemblyVersionInformation ="
+            yield!
+                literals
+                |> List.map (fun (name, value) -> $"    let [<Literal>] %s{name} = \"%s{value}\"")
+        ]
+        |> String.concat "\n"
+
+    let writeVersionInformation (projectPath : string) =
+        // The project path is not null, so neither is the name
+        let projectName = IO.Path.GetFileNameWithoutExtension projectPath |> nonNull
+        File.writeString false (Path.getDirectory projectPath </> "AssemblyInfo.fs") $"%s{versionInformation projectName}\n"
+
+    !!(rootDirectory </> "src/**/*.fsproj")
+    |> Seq.iter writeVersionInformation
 
 let dotnetPack ctx =
     // Get release notes with properly-linked version number
@@ -534,6 +581,7 @@ let gitRelease _ =
 
     !!(rootDirectory </> "src/**/AssemblyInfo.fs")
     ++ (rootDirectory </> "tests/**/AssemblyInfo.fs")
+    ++ assemblyInfoPropsPath
     |> Seq.iter (Git.Staging.stageFile "" >> ignore)
 
     let msg = $"release: bump version to `%s{latestEntry.NuGetVersion}`\n\n%s{releaseNotesGitCommitFormat}"

build/build.fsproj

@@ -25,7 +25,6 @@
     <PackageReference Include="Fake.Core.Process" />
     <PackageReference Include="Fake.Core.ReleaseNotes" />
     <PackageReference Include="Fake.Core.Target" />
-    <PackageReference Include="Fake.DotNet.AssemblyInfoFile" />
     <PackageReference Include="Fake.DotNet.Cli" />
     <PackageReference Include="Fake.DotNet.Paket" />
     <PackageReference Include="Fake.IO.FileSystem" />

src/AssemblyInfo.Build.props

@@ -0,0 +1,15 @@
+<!-- Auto-Generated by FAKE; do not edit -->
+<Project>
+  <PropertyGroup>
+    <Product>FSharp.Collections.Immutable</Product>
+    <AssemblyVersion>1.0.0</AssemblyVersion>
+    <FileVersion>1.0.0</FileVersion>
+    <InformationalVersion>1.0.0</InformationalVersion>
+    <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+  </PropertyGroup>
+  <ItemGroup>
+    <AssemblyMetadata Include="ReleaseDate" Value="2020-02-23T00:00:00.0000000" />
+    <AssemblyMetadata Include="ReleaseChannel" Value="release" />
+    <AssemblyMetadata Include="GitHash" Value="59d59515d1f3a3ecee1bb208b9bc1378035e4694" />
+  </ItemGroup>
+</Project>

src/Directory.Build.props

@@ -1,5 +1,7 @@
 <Project>
     <Import Project="$([MSBuild]::GetPathOfFileAbove('Directory.Build.props', '$(MSBuildThisFileDirectory)../'))" />
+    <!-- The build script (FAKE) writes the assembly information of the release into this file, and the SDK generates the assembly attributes from it -->
+    <Import Project="AssemblyInfo.Build.props" Condition="Exists('$(MSBuildThisFileDirectory)AssemblyInfo.Build.props')" />
     <PropertyGroup>
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
         <IsPackable>true</IsPackable>

src/FSharp.Collections.Immutable/AssemblyInfo.fs

@@ -1,16 +1,5 @@
 // Auto-Generated by FAKE; do not edit
 namespace System
-open System.Reflection
-
-[<assembly: AssemblyTitleAttribute("FSharp.Collections.Immutable")>]
-[<assembly: AssemblyProductAttribute("FSharp.Collections.Immutable")>]
-[<assembly: AssemblyVersionAttribute("1.0.0")>]
-[<assembly: AssemblyMetadataAttribute("ReleaseDate","2020-02-23T00:00:00.0000000")>]
-[<assembly: AssemblyFileVersionAttribute("1.0.0")>]
-[<assembly: AssemblyInformationalVersionAttribute("1.0.0")>]
-[<assembly: AssemblyMetadataAttribute("ReleaseChannel","release")>]
-[<assembly: AssemblyMetadataAttribute("GitHash","59d59515d1f3a3ecee1bb208b9bc1378035e4694")>]
-do ()
 
 module internal AssemblyVersionInformation =
     let [<Literal>] AssemblyTitle = "FSharp.Collections.Immutable"