Fixing signature-related code fixes (dotnet#15766)

* Fixing signature-related code fixes

* fixing merge issues

* Removing unused code

Author: psfinaki

Diff for: FSharp.Editor.sln

@@ -19,6 +19,8 @@ Project("{F2A71F9B-5D33-465A-A702-920D77279786}") = "FSharp.VS.FSI", "vsintegrat
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "FSharp.Editor.IntegrationTests", "vsintegration\tests\FSharp.Editor.IntegrationTests\FSharp.Editor.IntegrationTests.csproj", "{42BE0F2F-BC45-437B-851D-E88A83201339}"
 EndProject
+Project("{6EC3EE1D-3C4E-46DD-8F32-0CC8E7565705}") = "FSharp.Test.Utilities", "tests\FSharp.Test.Utilities\FSharp.Test.Utilities.fsproj", "{B7148170-93C5-4F2F-B31D-85316D3248CF}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -73,6 +75,12 @@ Global
 		{42BE0F2F-BC45-437B-851D-E88A83201339}.Proto|Any CPU.Build.0 = Debug|Any CPU
 		{42BE0F2F-BC45-437B-851D-E88A83201339}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{42BE0F2F-BC45-437B-851D-E88A83201339}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Proto|Any CPU.ActiveCfg = Debug|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Proto|Any CPU.Build.0 = Debug|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B7148170-93C5-4F2F-B31D-85316D3248CF}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

Diff for: tests/FSharp.Test.Utilities/ProjectGeneration.fs

@@ -231,7 +231,9 @@ type SyntheticProject =
       OtherOptions: string list
       AutoAddModules: bool
       NugetReferences: Reference list
-      FrameworkReferences: Reference list }
+      FrameworkReferences: Reference list
+      /// If set to true this project won't cause an exception if there are errors in the initial check
+      SkipInitialCheck: bool }
 
     static member Create(?name: string) =
         let name = defaultArg name $"TestProject_{Guid.NewGuid().ToString()[..7]}"
@@ -245,7 +247,8 @@ type SyntheticProject =
           OtherOptions = []
           AutoAddModules = true
           NugetReferences = []
-          FrameworkReferences = [] }
+          FrameworkReferences = []
+          SkipInitialCheck = false }
 
     static member Create([<ParamArray>] sourceFiles: SyntheticSourceFile[]) =
         { SyntheticProject.Create() with SourceFiles = sourceFiles |> List.ofArray }
@@ -754,7 +757,7 @@ let SaveAndCheckProject project checker =
 
         let! results = checker.ParseAndCheckProject(options)
 
-        if not (Array.isEmpty results.Diagnostics) then
+        if not (Array.isEmpty results.Diagnostics || project.SkipInitialCheck) then
             failwith $"Project {project.Name} failed initial check: \n%A{results.Diagnostics}"
 
         let! signatures =

Diff for: vsintegration/src/FSharp.Editor/CodeFixes/CodeFixHelpers.fs

@@ -4,7 +4,6 @@ namespace Microsoft.VisualStudio.FSharp.Editor
 
 open System
 open System.Threading
-open System.Threading.Tasks
 open System.Collections.Immutable
 open System.Diagnostics
 
@@ -73,24 +72,6 @@ module internal CodeFixHelpers =
 
         TelemetryReporter.ReportSingleEvent(TelemetryEvents.CodefixActivated, props)
 
-    let createFixAllProvider name getChanges =
-        FixAllProvider.Create(fun fixAllCtx doc allDiagnostics ->
-            backgroundTask {
-                let sw = Stopwatch.StartNew()
-                let! (changes: seq<TextChange>) = getChanges (doc, allDiagnostics, fixAllCtx.CancellationToken)
-                let! text = doc.GetTextAsync(fixAllCtx.CancellationToken)
-                let doc = doc.WithText(text.WithChanges(changes))
-
-                do
-                    reportCodeFixTelemetry
-                        allDiagnostics
-                        doc
-                        name
-                        [| "scope", fixAllCtx.Scope.ToString(); "elapsedMs", sw.ElapsedMilliseconds |]
-
-                return doc
-            })
-
     let createTextChangeCodeFix (name: string, title: string, context: CodeFixContext, changes: TextChange seq) =
         CodeAction.Create(
             title,

Diff for: vsintegration/src/FSharp.Editor/CodeFixes/RenameParamToMatchSignature.fs

@@ -3,8 +3,6 @@
 namespace Microsoft.VisualStudio.FSharp.Editor
 
 open System.Composition
-open System.Threading
-open System.Threading.Tasks
 open System.Collections.Immutable
 open System.Text.RegularExpressions
 
@@ -13,11 +11,13 @@ open Microsoft.CodeAnalysis.Text
 open Microsoft.CodeAnalysis.CodeFixes
 open Microsoft.VisualStudio.FSharp.Editor.SymbolHelpers
 
+open FSharp.Compiler.Diagnostics
 open FSharp.Compiler.Tokenization.FSharpKeywords
 
+open CancellableTasks
+
 [<ExportCodeFixProvider(FSharpConstants.FSharpLanguageName, Name = CodeFix.FSharpRenameParamToMatchSignature); Shared>]
 type internal RenameParamToMatchSignatureCodeFixProvider [<ImportingConstructor>] () =
-
     inherit CodeFixProvider()
 
     let getSuggestion (d: Diagnostic) =
@@ -28,53 +28,41 @@ type internal RenameParamToMatchSignatureCodeFixProvider [<ImportingConstructor>
         else
             ValueNone
 
-    override _.FixableDiagnosticIds = ImmutableArray.Create("FS3218")
+    override _.FixableDiagnosticIds = ImmutableArray.Create "FS3218"
+
+    override this.RegisterCodeFixesAsync context = context.RegisterFsharpFix this
 
-    member this.GetChanges(document: Document, diagnostics: ImmutableArray<Diagnostic>, ct: CancellationToken) =
-        backgroundTask {
-            let! sourceText = document.GetTextAsync(ct)
+    override this.GetFixAllProvider() = this.RegisterFsharpFixAll()
 
-            let! changes =
-                seq {
-                    for d in diagnostics do
-                        let suggestionOpt = getSuggestion d
+    interface IFSharpCodeFixProvider with
+        member _.GetCodeFixIfAppliesAsync context =
+            cancellableTask {
+                let! sourceText = context.GetSourceTextAsync()
 
-                        match suggestionOpt with
-                        | ValueSome suggestion ->
-                            let replacement = NormalizeIdentifierBackticks suggestion
+                let suggestionOpt = getSuggestion context.Diagnostics[0]
 
-                            async {
-                                let! symbolUses = getSymbolUsesOfSymbolAtLocationInDocument (document, d.Location.SourceSpan.Start)
-                                let symbolUses = symbolUses |> Option.defaultValue [||]
+                match suggestionOpt with
+                | ValueSome suggestion ->
+                    let replacement = NormalizeIdentifierBackticks suggestion
 
-                                return
-                                    [|
-                                        for symbolUse in symbolUses do
-                                            match RoslynHelpers.TryFSharpRangeToTextSpan(sourceText, symbolUse.Range) with
-                                            | None -> ()
-                                            | Some span ->
-                                                let textSpan = Tokenizer.fixupSpan (sourceText, span)
-                                                yield TextChange(textSpan, replacement)
-                                    |]
+                    let! symbolUses = getSymbolUsesOfSymbolAtLocationInDocument (context.Document, context.Span.Start)
+                    let symbolUses = symbolUses |> Option.defaultValue [||]
 
+                    let changes =
+                        [
+                            for symbolUse in symbolUses do
+                                let span = RoslynHelpers.FSharpRangeToTextSpan(sourceText, symbolUse.Range)
+                                let textSpan = Tokenizer.fixupSpan (sourceText, span)
+                                yield TextChange(textSpan, replacement)
+                        ]
+
+                    return
+                        ValueSome
+                            {
+                                Name = CodeFix.FSharpRenameParamToMatchSignature
+                                Message = CompilerDiagnostics.GetErrorMessage(FSharpDiagnosticKind.ReplaceWithSuggestion suggestion)
+                                Changes = changes
                             }
-                        | ValueNone -> ()
-                }
-                |> Async.Parallel
-
-            return (changes |> Seq.concat)
-        }
-
-    override this.RegisterCodeFixesAsync ctx : Task =
-        backgroundTask {
-            let title = ctx.Diagnostics |> Seq.head |> getSuggestion
-
-            match title with
-            | ValueSome title ->
-                let! changes = this.GetChanges(ctx.Document, ctx.Diagnostics, ctx.CancellationToken)
-                ctx.RegisterFsharpFix(CodeFix.FSharpRenameParamToMatchSignature, title, changes)
-            | ValueNone -> ()
-        }
-
-    override this.GetFixAllProvider() =
-        CodeFixHelpers.createFixAllProvider CodeFix.FSharpRenameParamToMatchSignature this.GetChanges
+
+                | ValueNone -> return ValueNone
+            }

Diff for: vsintegration/tests/FSharp.Editor.Tests/CodeFixes/CodeFixTestFramework.fs

@@ -20,6 +20,7 @@ type TestCodeFix = { Message: string; FixedCode: string }
 type Mode =
     | Auto
     | WithOption of CustomProjectOption: string
+    | WithSignature of FsiCode: string
     | Manual of Squiggly: string * Diagnostic: string
 
 let inline toOption o =
@@ -41,6 +42,7 @@ let getDocument code mode =
     match mode with
     | Auto -> RoslynTestHelpers.GetFsDocument code
     | WithOption option -> RoslynTestHelpers.GetFsDocument(code, option)
+    | WithSignature fsiCode -> RoslynTestHelpers.GetFsiAndFsDocuments fsiCode code |> Seq.last
     | Manual _ -> RoslynTestHelpers.GetFsDocument code
 
 let getRelevantDiagnostics (document: Document) =
@@ -64,6 +66,7 @@ let createTestCodeFixContext (code: string) document (mode: Mode) diagnosticIds
                 getRelevantDiagnostics document
                 |> Array.filter (fun d -> diagnosticIds |> Seq.contains d.ErrorNumberText)
             | WithOption _ -> getRelevantDiagnostics document
+            | WithSignature _ -> getRelevantDiagnostics document
             | Manual (squiggly, diagnostic) ->
                 let spanStart = code.IndexOf squiggly
                 let span = TextSpan(spanStart, squiggly.Length)

Diff for: vsintegration/tests/FSharp.Editor.Tests/CodeFixes/RenameParamToMatchSignatureTests.fs

@@ -0,0 +1,42 @@
+// Copyright (c) Microsoft Corporation.  All Rights Reserved.  See License.txt in the project root for license information.
+
+module FSharp.Editor.Tests.CodeFixes.RenameParamToMatchSignatureTests
+
+open Microsoft.VisualStudio.FSharp.Editor
+open Xunit
+
+open CodeFixTestFramework
+
+let private codeFix = RenameParamToMatchSignatureCodeFixProvider()
+
+[<Fact>]
+let ``Fixes FS3218`` () =
+    let fsCode =
+        """
+module Library
+
+let id y = y
+"""
+
+    let fsiCode =
+        """
+module Library
+
+val id: x: 'a -> 'a
+"""
+
+    let expected =
+        Some
+            {
+                Message = "Replace with 'x'"
+                FixedCode =
+                    """
+module Library
+
+let id x = x
+"""
+            }
+
+    let actual = codeFix |> tryFix fsCode (WithSignature fsiCode)
+
+    Assert.Equal(expected, actual)

Diff for: vsintegration/tests/FSharp.Editor.Tests/FSharp.Editor.Tests.fsproj

@@ -58,6 +58,7 @@
     <Compile Include="CodeFixes\ChangeEqualsInFieldTypeToColonTests.fs" />
     <Compile Include="CodeFixes\RemoveUnusedOpensTests.fs" />
     <Compile Include="CodeFixes\SimplifyNameTests.fs" />
+    <Compile Include="CodeFixes\RenameParamToMatchSignatureTests.fs" />
     <Compile Include="Hints\HintTestFramework.fs" />
     <Compile Include="Hints\OptionParserTests.fs" />
     <Compile Include="Hints\InlineParameterNameHintTests.fs" />

Diff for: vsintegration/tests/FSharp.Editor.Tests/Helpers/RoslynHelpers.fs

@@ -358,17 +358,25 @@ type RoslynTestHelpers private () =
         |> RoslynTestHelpers.GetSingleDocument
 
     static member GetFsiAndFsDocuments (fsiCode: string) (fsCode: string) =
-        let projectId = ProjectId.CreateNewId()
-        let projFilePath = "C:\\test.fsproj"
-
-        let fsiDocInfo =
-            RoslynTestHelpers.CreateDocumentInfo projectId "C:\\test.fsi" fsiCode
-
-        let fsDocInfo = RoslynTestHelpers.CreateDocumentInfo projectId "C:\\test.fs" fsCode
-
         let projInfo =
-            RoslynTestHelpers.CreateProjectInfo projectId projFilePath [ fsiDocInfo; fsDocInfo ]
+            { SyntheticProject.Create(
+                  { sourceFile "test" [] with
+                      SignatureFile = Custom fsiCode
+                      Source = fsCode
+                  }
+              ) with
+
+                AutoAddModules = false
+                SkipInitialCheck = true
+                OtherOptions =
+                    [
+                        "--targetprofile:netcore" // without this lib some symbols are not loaded
+                        "--nowarn:3384" // The .NET SDK for this script could not be determined
+                    ]
+            }
 
-        let solution = RoslynTestHelpers.CreateSolution [ projInfo ]
+        let solution, _ = RoslynTestHelpers.CreateSolution projInfo
         let project = solution.Projects |> Seq.exactlyOne
+
         project.Documents
+        |> Seq.sortWith (fun d1 _ -> if d1.IsFSharpSignatureFile then -1 else 1)