fix powershell -version and help (#4958)

 PowerShell -v  behavior updated to align with other tools like git, curl, and bash where args after  -v  are silently ignored.

Built-in help updated to reflect changes we've made to the console host in PSCore6 removing unsupported parameters.

* [feature]
removed test that is no longer valid due to change in -version behavior to return error

* [feature]
fixed `-v X` so that it errors out correctly with proper exit code
updated test to catch this

* [feature]
address PR feedback

* [feature]
make -v have behavior consistent with other tools like git, curl, bash where args after -v are ignored
removed duplicate but not exactly help text that wasn't being used in the resource file
removed parameters from help that are not support in PSCore6

src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs

@@ -400,15 +400,9 @@ internal bool NonInteractive
 
         private void ShowHelp()
         {
+            Dbg.Assert(_helpText != null, "_helpText should not be null");
             _hostUI.WriteLine("");
-            if (_helpText == null)
-            {
-                _hostUI.WriteLine(CommandLineParameterParserStrings.DefaultHelp);
-            }
-            else
-            {
-                _hostUI.Write(_helpText);
-            }
+            _hostUI.Write(_helpText);
             _hostUI.WriteLine("");
         }
 
@@ -548,17 +542,9 @@ private void ParseHelper(string[] args)
                     _noInteractive = true;
                     _skipUserInit = true;
                     _noExit = false;
-
-                    ++i;
-                    if (i < args.Length)
-                    {
-                        WriteCommandLineError(string.Format(CultureInfo.CurrentCulture, CommandLineParameterParserStrings.DeprecatedVersionParameter,args[i]));
-                    }
                     break;
                 }
-
-
-                if (MatchSwitch(switchKey, "help", "h") || MatchSwitch(switchKey, "?", "?"))
+                else if (MatchSwitch(switchKey, "help", "h") || MatchSwitch(switchKey, "?", "?"))
                 {
                     _showHelp = true;
                     _abortStartup = true;

src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHost.cs

@@ -200,7 +200,7 @@ internal sealed partial class ConsoleHost
                     // Alternatively, we could call s_theConsoleHost.UI.WriteLine(s_theConsoleHost.Version.ToString());
                     // or start up the engine and retrieve the information via $psversiontable.GitCommitId
                     // but this returns the semantic version and avoids executing a script
-                    s_theConsoleHost.UI.WriteLine("powershell " + PSVersionInfo.GitCommitId);
+                    s_theConsoleHost.UI.WriteLine("PowerShell " + PSVersionInfo.GitCommitId);
                     return 0;
                 }
 

src/Microsoft.PowerShell.ConsoleHost/resources/CommandLineParameterParserStrings.resx

@@ -129,89 +129,6 @@
   <data name="UnknownParameter" xml:space="preserve">
     <value>Unrecognized parameter: '{0}'.</value>
   </data>
-  <data name="DefaultHelp" xml:space="preserve">
-    <value>PowerShell[.exe] [-PSConsoleFile &lt;file&gt; | -Version &lt;version&gt;]
-    [-NoLogo] [-NoExit] [-NoProfile] [-NonInteractive] [-STA]
-    [-OutputFormat {Text | XML}] [-InputFormat {Text | XML}]
-    [-ConfigurationName &lt;string&gt;]
-    [-File fileName [arguments...]] [-ExecutionPolicy &lt;ExecutionPolicy&gt;]
-    [-Command { - | &lt;script-block&gt; [-args &lt;arg-array&gt;]
-                  | &lt;string&gt; [&lt;CommandParameters&gt;] } ]
-
-PowerShell[.exe] -Help | -? | /?
-
--PSConsoleFile
-    Loads the specified PowerShell console file. To create a console
-    file, use Export-Console in PowerShell.
-
--Version
-    Starts the specified version of PowerShell.
-
--NoLogo
-    Hides the copyright banner at startup.
-
--NoExit
-    Does not exit after running startup commands.
-
--NoProfile
-    Does not use the user profile.
-
--NonInteractive
-    Does not present an interactive prompt to the user.
-
--STA
-    Uses a single-threaded apartment for the execution thread.
-
--OutputFormat
-    Determines how output from PowerShell is formatted. Valid values
-    are "Text" (text strings) or "XML" (serialized CLIXML format).
-
--InputFormat
-    Describes the format of data sent to PowerShell. Valid values are
-    "Text" (text strings) or "XML" (serialized CLIXML format).
-
--ConfigurationName
-    Specifies a configuration endpoint in which PowerShell is run.
-    This can be any endpoint registered on the local machine including the
-    default PowerShell remoting endpoints or a custom endpoint having
-    specific user role capabilities.
-
--Command
-    Executes the specified commands (and any parameters) as though they were
-    typed at the PowerShell command prompt, and then exits, unless
-    NoExit is specified. The value of Command can be "-", a string. or a
-    script block.
-
-    If the value of Command is "-", the command text is read from standard
-    input.
-
-    Script blocks must be enclosed in braces ({}). You can specify a script
-    block only when running PowerShell.exe in PowerShell. The results
-    of the script are returned to the parent shell as deserialized XML objects,
-    not live objects.
-
-    If the value of Command is a string, Command must be the last parameter
-    in the command , because any characters typed after the command are
-    interpreted as the command arguments.
-       To write a string that runs a PowerShell command, use the format:
-    "&amp; {&lt;command&gt;}"
-    where the quotation marks indicate a string and the invoke operator (&amp;)
-    causes the command to be run.
-
--Help, -?, /?
-    Shows this message. If you are typing a PowerShell.exe command in Windows
-    PowerShell, prepend the command parameters with a hyphen (-), not a forward
-    slash (/). You can use either a hyphen or forward slash in Cmd.exe.
-
-
-EXAMPLES
-    PowerShell -PSConsoleFile SqlSnapin.Psc1
-    PowerShell -version 1.0 -NoLogo -InputFormat text -OutputFormat XML
-    PowerShell -ConfigurationName AdminRoles
-    PowerShell -Command {Get-EventLog -LogName security}
-    PowerShell -Command "&amp; {Get-EventLog -LogName security}"
-</value>
-  </data>
   <data name="TooManyParametersToCommand" xml:space="preserve">
     <value>'-' was specified with the -Command parameter; no other arguments to -Command are permitted.</value>
   </data>
@@ -272,7 +189,4 @@ EXAMPLES
   <data name="InvalidArgument" xml:space="preserve">
     <value>Invalid argument '{0}', did you mean:</value>
   </data>
-  <data name="DeprecatedVersionParameter" xml:space="preserve">
-    <value>Usage of '-Version {0}' is not supported. '-Version' currently only returns the current PowerShell version.</value>
-  </data>
 </root>

src/Microsoft.PowerShell.ConsoleHost/resources/ManagedEntranceStrings.resx

@@ -122,8 +122,8 @@
 Copyright (C) Microsoft Corporation. All rights reserved.</value>
   </data>
   <data name="ShellHelp" xml:space="preserve">
-    <value>PowerShell[.exe] [-PSConsoleFile &lt;file&gt; | -Version &lt;version&gt;]
-    [-NoLogo] [-NoExit] [-Sta] [-Mta] [-NoProfile] [-NonInteractive] [-Interactive]
+    <value>PowerShell[.exe] [-Version] [-NoLogo] [-NoExit]
+    [-NoProfile] [-NonInteractive] [-Interactive]
     [-InputFormat {Text | XML}] [-OutputFormat {Text | XML}]
     [-WindowStyle &lt;style&gt;] [-EncodedCommand &lt;Base64EncodedCommand&gt;]
     [-ConfigurationName &lt;string&gt;]
@@ -133,27 +133,16 @@ Copyright (C) Microsoft Corporation. All rights reserved.</value>
 
 PowerShell[.exe] -Help | -? | /?
 
--PSConsoleFile
-    Loads the specified PowerShell console file. To create a console
-    file, use Export-Console in PowerShell.
-
 -Version
-    Starts the specified version of PowerShell.
-    Enter a version number with the parameter, such as "-version 2.0".
+    Shows the version of PowerShell and exits.
+    Additional arguments are ignored.
 
 -NoLogo
     Hides the copyright banner at startup.
 
 -NoExit
     Does not exit after running startup commands.
 
--Sta
-    Starts the shell using a single-threaded apartment.
-    Single-threaded apartment (STA) is the default.
-
--Mta
-    Start the shell using a multithreaded apartment.
-
 -NoProfile
     Does not load the PowerShell profile.
 
@@ -228,8 +217,7 @@ PowerShell[.exe] -Help | -? | /?
     slash (/). You can use either a hyphen or forward slash in Cmd.exe.
 
 EXAMPLES
-    PowerShell -PSConsoleFile SqlSnapIn.Psc1
-    PowerShell -version 2.0 -NoLogo -InputFormat text -OutputFormat XML
+    PowerShell -Version
     PowerShell -ConfigurationName AdminRoles
     PowerShell -Command {Get-EventLog -LogName security}
     PowerShell -Command "&amp; {Get-EventLog -LogName security}"
@@ -239,6 +227,6 @@ EXAMPLES
     $command = 'dir "c:\program files" '
     $bytes = [System.Text.Encoding]::Unicode.GetBytes($command)
     $encodedCommand = [Convert]::ToBase64String($bytes)
-    powershell.exe -encodedCommand $encodedCommand</value>
+    powershell -encodedCommand $encodedCommand</value>
   </data>
 </root>

test/powershell/Host/ConsoleHost.Tests.ps1

@@ -165,26 +165,15 @@ Describe "ConsoleHost unit tests" -tags "Feature" {
             $actual | Should Be $expected
         }
 
-        It "-Version should return the engine version" {
-            $currentVersion = "powershell " + $PSVersionTable.GitCommitId.ToString()
-            $observed = & $powershell -version
-            $observed | should be $currentVersion
-        }
-
-        It "-Version should ignore other parameters" {
+        It "-Version should return the engine version using: -version <value>" -TestCases @(
+            @{value = ""},
+            @{value = "2"},
+            @{value = "-command 1-1"}
+        ) {
             $currentVersion = "powershell " + $PSVersionTable.GitCommitId.ToString()
-            $observed = & $powershell -version -command get-date
-            # no extraneous output
+            $observed = & $powershell -version $value 2>&1
             $observed | should be $currentVersion
-        }
-
-        It "-Version should write an error if a value is present" {
-            $versionValue = "abrakadabra"
-            $tempFile = Join-Path $testdrive "expectedError.txt"
-            $observed = & $powershell -version $versionValue > $tempFile
-            $expectedError = (Get-Content $tempFile)[0]
-
-            $expectedError | Should Match $versionValue
+            $LASTEXITCODE | Should Be 0
         }
 
         It "-File should be default parameter" {