getProjectInfo with relative path does not work.

[nojaf]

Describe the bug
Hello, in fsprojects/FSharp.Formatting#793 we discovered that ProjectLoader.getProjectInfo cannot be called with a relative project path.

Very concretely, it goes wrong in VisualTree.relativePathOf:

System.Uri doesn't accept the input:
(dotnet fsi)

> System.Uri(".\\src\\Fantomas.Core\\");;
System.UriFormatException: Invalid URI: The format of the URI could not be determined.
   at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind, UriCreationOptions& creationOptions)
   at System.Uri..ctor(String uriString)
   at <StartupCode$FSI_0002>.$FSI_0002.main@() in C:\Users\nojaf\Projects\stdin:line 1
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
   at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)

To Reproduce

Changing the test project to:

[<EntryPoint>]
let main argv =
    Environment.CurrentDirectory <- @"C:\Users\nojaf\Projects\fantomas"
    
    let _toolsPath =
        Init.init (IO.DirectoryInfo(@"C:\Users\nojaf\Projects\fantomas")) (Some(IO.FileInfo(@"C:\Program Files\dotnet\dotnet.exe")))
        //Init.init (IO.DirectoryInfo Environment.CurrentDirectory) None

    let info = ProjectLoader.getProjectInfo @".\src\Fantomas.Core\Fantomas.Core.fsproj" [] BinaryLogGeneration.Off [
              "TargetPath"
              "OutputType"
              "IsTestProject"
              "IsPackable"
              "RepositoryUrl"
              "UsesMarkdownComments"
              "FsDocsCollectionNameLink"
              "FsDocsLogoSource"
              "FsDocsNavbarPosition"
              "FsDocsTheme"
              "FsDocsLogoLink"
              "FsDocsLicenseLink"
              "FsDocsReleaseNotesLink"
              "FsDocsSourceFolder"
              "FsDocsSourceRepository"
              "FsDocsWarnOnMissingDocs"
              "RepositoryType"
              "RepositoryBranch"
              "PackageProjectUrl"
              "Authors"
              "GenerateDocumentationFile"
              //Removed because this is typically a multi-line string and dotnet-proj-info can't handle this
              //"Description"
              "PackageLicenseExpression"
              "PackageTags"
              "Copyright"
              "PackageVersion"
              "PackageIconUrl"
              //Removed because this is typically a multi-line string and dotnet-proj-info can't handle this
              //"PackageReleaseNotes"
              "RepositoryCommit"
              "TargetFrameworks"
              "RunArguments" ]
    ignore info
    0

reproduces the problem after updating the global json (in Fantomas repository) to

{
  "sdk": {
    "version": "6.0.405"
  }
}

Oh and you probably need to build Fantomas.Core as well.

Expected behaviour

Either we should get an exception in ProjectLoader.getProjectInfo those relative paths are not supported, or this should work.

[nojaf]

@TheAngryByrd what fix would you like to see for this?

[TheAngryByrd]

I guess you could try let fromUri = Uri(fromPath, UriKind.RelativeOrAbsolute) and see if that fixes the issue.