WriteCodeFragment should support IsLiteral suffix for parity with MSBuild

[Youssef1313]

See dotnet/msbuild#9724 for the original bug report.

MSBuild PR that implemented the feature for C#/VB in the past: dotnet/msbuild#6285

See https://learn.microsoft.com/en-us/visualstudio/msbuild/writecodefragment-task for documentation for IsLiteral. (NOTE: The doc page says it's not supported by F# and will need to be updated when/if this is implemented)

cc @Evangelink

The WriteCodeFragment implementation currently resides at src/FSharp.Build/WriteCodeFragment.fs and is part of the Fsharp.Build project.

This is the part that requires changing in order to support assignment of named properties as part of the attribute generation.

The syntax to set properties in F# attributes is: $nameOfAttribute = $valueOfAttribute, like this:
[<CommandLine.Verb("start", HelpText = "Start the game", IsDefault = true)>]

("start" is a regular constructor argument, HelpText and IsDefault are property assignments).

Make sure you add tests for the newly added FSharp.Build feature.
The tests should go to tests/FSharp.Build.UnitTests/WriteCodeFragmentTests.fs

You will need to define an attribute that allows public property setting

[T-Gro]

Hi @Youssef1313 , could you please provide a code snippet which would show where this is useful (= and where this is being a paint point as of today) ?

Do I understand it correct that this is to overcome attributes which are not covering their inputs via constructor arguments, and only provide setter properties?

[Youssef1313]

Hi @T-Gro

Code snippet:

<AssemblyAttribute Include="Microsoft.VisualStudio.TestTools.UnitTesting.Parallelize">
  <_Parameter1>Workers = 0</_Parameter1>
  <_Parameter1_IsLiteral>true</_Parameter1_IsLiteral>
  <_Parameter2>Scope = Microsoft.VisualStudio.TestTools.UnitTesting.ExecutionScope.MethodLevel</_Parameter2>
  <_Parameter2_IsLiteral>true</_Parameter2_IsLiteral>
</AssemblyAttribute>

That works fine today with C#/VB, but no with F#.

And yes, this is for named attribute arguments (i.e, property setters).