Add 'fsi' between 'dotnet' and '--help' for fsi.exe (#9066)

* Add 'fsi' between 'dotnet' and '--help' for fsi.exe

* Fix tests, make execution comparison case insensitive on windows

Co-authored-by: Kevin Ransom <codecutter@hotmail.com>

Author: AndreasHassing

src/fsharp/fsi/fsi.fs

@@ -586,8 +586,6 @@ let internal directoryName (s:string) =
         | res -> if res = "" then "." else res
 
 
-
-
 //----------------------------------------------------------------------------
 // cmd line - state for options
 //----------------------------------------------------------------------------
@@ -620,13 +618,29 @@ type internal FsiCommandLineOptions(fsi: FsiEvaluationSessionHostConfig, argv: s
     let isInteractiveServer() = fsiServerName <> ""  
     let recordExplicitArg arg = explicitArgs <- explicitArgs @ [arg]
 
-    let executableFileName = 
-        lazy 
-            match tcConfigB.exename with
-            | Some s -> s
-            | None -> 
-            let currentProcess = System.Diagnostics.Process.GetCurrentProcess()
-            Path.GetFileName(currentProcess.MainModule.FileName)
+    let executableFileNameWithoutExtension =
+        lazy
+            let getFsiCommandLine () =
+                let fileNameWithoutExtension path = Path.GetFileNameWithoutExtension(path)
+
+                let currentProcess = Process.GetCurrentProcess()
+                let processFileName = fileNameWithoutExtension currentProcess.MainModule.FileName
+
+                let commandLineExecutableFileName =
+                    try fileNameWithoutExtension (Environment.GetCommandLineArgs().[0])
+                    with _ -> ""
+
+                let stringComparison =
+                    match Environment.OSVersion.Platform with
+                    | PlatformID.MacOSX
+                    | PlatformID.Unix -> StringComparison.Ordinal
+                    | _ -> StringComparison.OrdinalIgnoreCase
+                
+                if String.Compare(processFileName, commandLineExecutableFileName, stringComparison) = 0
+                then processFileName
+                else sprintf "%s %s" processFileName commandLineExecutableFileName
+
+            tcConfigB.exename |> Option.defaultWith getFsiCommandLine
 
 
     // Additional fsi options are list below.
@@ -635,7 +649,7 @@ type internal FsiCommandLineOptions(fsi: FsiEvaluationSessionHostConfig, argv: s
     let displayHelpFsi tcConfigB (blocks:CompilerOptionBlock list) =
         DisplayBannerText tcConfigB;
         fprintfn fsiConsoleOutput.Out ""
-        fprintfn fsiConsoleOutput.Out "%s" (FSIstrings.SR.fsiUsage(executableFileName.Value))
+        fprintfn fsiConsoleOutput.Out "%s" (FSIstrings.SR.fsiUsage(executableFileNameWithoutExtension.Value))
         PrintCompilerOptionBlocks blocks
         exit 0
 
@@ -761,7 +775,7 @@ type internal FsiCommandLineOptions(fsi: FsiEvaluationSessionHostConfig, argv: s
         fsiConsoleOutput.uprintfn  "%s" (FSIstrings.SR.fsiBanner3())
 
     member __.ShowHelp() =
-        let helpLine = sprintf "%s --help" (Path.GetFileNameWithoutExtension executableFileName.Value)
+        let helpLine = sprintf "%s --help" executableFileNameWithoutExtension.Value
 
         fsiConsoleOutput.uprintfn  ""
         fsiConsoleOutput.uprintfnn "%s" (FSIstrings.SR.fsiIntroTextHeader1directives());

tests/fsharpqa/Source/CompilerOptions/fsi/help/help40-nologo.437.1033.bsl

@@ -1,5 +1,5 @@
 
-Usage: fsi.exe <options> [script.fsx [<arguments>]]
+Usage: fsiAnyCpu <options> [script.fsx [<arguments>]]
 
 
 		- INPUT FILES -

tests/fsharpqa/Source/CompilerOptions/fsi/help/help40.437.1033.bsl

@@ -1,7 +1,7 @@
 Microsoft (R) F# Interactive version 10.2.3 for F# 4.5
 Copyright (c) Microsoft Corporation. All Rights Reserved.
 
-Usage: fsi.exe <options> [script.fsx [<arguments>]]
+Usage: fsiAnyCpu <options> [script.fsx [<arguments>]]
 
 
 		- INPUT FILES -