(PowerShell#208) Improve UX of Crescendo cmdlets

This commit improves the author experience when
accelerating a native command.

This commit exposes all class properties as function
parameters. Where appropriate an argumentcompleter
attribute has been introduced to further enhance
the authoring experience when working with the
Microsoft.PowerShell.Crescendo module.

Author: steviecoaster

Microsoft.PowerShell.Crescendo/src/Microsoft.PowerShell.Crescendo.psm1

@@ -647,18 +647,137 @@ function Test-Handler {
 function New-ParameterInfo {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions","")]
     param (
-        [Parameter(Position=0,Mandatory=$true)][string]$Name,
-        [Parameter(Position=1,Mandatory=$true)][AllowEmptyString()][string]$OriginalName
+        [Parameter(Position=0,Mandatory=$true)]
+        [string]
+        $Name,
+
+        [Parameter(Position=1,Mandatory=$true)]
+        [AllowEmptyString()]
+        [string]
+        $OriginalName,
+
+        [Parameter()]
+        [string]
+        $OriginalText,
+
+        [Parameter()]
+        [string]
+        $Description,
+
+        [Parameter()]
+        [string]
+        $DefaultValue,
+
+        # some parameters are -param or +param which can be represented with a switch parameter
+        # so we need way to provide for this
+        [Parameter()]
+        [string]
+        $DefaultMissingValue,
+
+        # this is in case that the parameters apply before the OriginalCommandElements
+        [Parameter()]
+        [bool]
+        $ApplyToExecutable,
+
+        # when true, we don't pass this parameter to the native application at all
+        [Parameter()]
+        [bool]
+        $ExcludeAsArgument, 
+
+        # PSType
+        [Parameter()]
+        [string]
+        $ParameterType = 'object',
+
+        [Parameter()]
+        [string[]]
+        $AdditionalParameterAttributes,
+
+        [Parameter()]
+        [bool] 
+        $Mandatory,
+
+        [Parameter()]
+        [string[]]
+        $ParameterSetName,
+
+        [Parameter()]
+        [string[]]
+        $Aliases,
+
+        [Parameter()]
+        [int]
+        $Position = [int]::MaxValue,
+
+        [Parameter()]
+        [int]
+        $OriginalPosition,
+
+        [Parameter()]
+        [bool]
+        $ValueFromPipeline,
+
+        [Parameter()]
+        [bool]
+        $ValueFromPipelineByPropertyName,
+
+        [Parameter()][bool]
+        $ValueFromRemainingArguments,
+
+        # this means that we need to construct the parameter as "foo=bar"
+        [Parameter()]
+        [bool]
+        $NoGap, 
+        
+        # This is a scriptblock, file or function which will transform the value(s) of the parameter
+        # If the value needs to be transformed, this is the scriptblock to do it
+        [Parameter()]
+        [string]
+        $ArgumentTransform,
+
+        # this can be inline, file, or function
+        # the default is inline, but we will follow the same logic as for output handlers
+        # if 'function' we will inspect the current environment for the function and embed it in the module
+        # if 'file' we will hunt for the file in the current environment and copy it to the module location
+        # the value as a single object will be passed as an argument to the scriptblock/file/function
+        [Parameter()]
+        [string]
+        $ArgumentTransformType
     )
-    [ParameterInfo]::new($Name, $OriginalName)
+    $pi = [ParameterInfo]::new($Name,$OriginalName)
+
+    $PSBoundParameters.GetEnumerator() | 
+    ForEach-Object {
+        $pi.$($PSItem.Key) = $PSItem.Value
+    }
+
+    $pi
 }
 
 function New-UsageInfo {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions","")]
     param (
-        [Parameter(Position=0,Mandatory=$true)][string]$usage
+        [Parameter(Position=0,Mandatory=$true)]
+        [string]
+        $Synopsis,
+
+        [Parameter()]
+        [Switch]
+        $SupportsFlags,
+
+        [Parameter()]
+        [Switch]
+        $HasOptions
+    
         )
-    [UsageInfo]::new($usage)
+    $ui = [UsageInfo]::new($usage)
+
+    $PSBoundParameters.GetEnumerator() | ForEach-Object {
+        $ui.$($PSItem.Key) = $PSItem.Value
+    }
+
+    $ui
+
 }
 
 function New-ExampleInfo {
@@ -673,20 +792,126 @@ function New-ExampleInfo {
 
 function New-OutputHandler {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions","")]
-    param ( )
-    [OutputHandler]::new()
+    param ( 
+        [Parameter()]
+        [string]
+        $ParameterSetName,
+        
+        # This is a scriptblock which does the conversion to an object
+        [Parameter()]
+        [string]
+        $Handler,
+
+        # Inline, Function, Script, or ByPass
+        [Parameter()]
+        [string]
+        $HandlerType,
+
+        # this indicates whether the output should be streamed to the handler
+        [Parameter()]
+        [bool]
+        $StreamOutput
+    
+    )
+
+    $oh = [OutputHandler]::new() # I O!
+    $PSBoundParameters.GetEnumerator() |
+    ForEach-Object {
+        $oh.$($psitem.Key) = $PSItem.Value
+    }
+    $oh
 
 }
 
 function New-CrescendoCommand {
     [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSUseShouldProcessForStateChangingFunctions","")]
     param (
-        [Parameter(Position=0,Mandatory=$true)][string]$Verb,
-        [Parameter(Position=1,Mandatory=$true)][string]$Noun,
-        [Parameter(Position=2)][string]$OriginalName
+        [Parameter(Position = 0)]
+        [ArgumentCompleter( {
+            param ( $commandName,
+                    $parameterName,
+                    $wordToComplete,
+                    $commandAst,
+                    $fakeBoundParameters )
+                    if ($WordToComplete) {
+                        (Get-Verb).Verb | Where-Object { $_ -match "^$WordToComplete"}
+                    } 
+
+                    else {
+                        (Get-Verb).Verb
+                    }
+        } )]
+        [String]
+        $Verb,
+
+        [Parameter(Position = 1)]
+        [string]
+        $Noun,
+
+        [Parameter(Position=2)]
+        [string]
+        $OriginalName,
+
+        [Parameter(Position=3)]
+        [string]
+        $Description,
+
+        [Parameter()]
+        [string[]]
+        $Aliases,
+
+        [Parameter()]
+        [string] $DefaultParameterSetName,
+
+        [Parameter()]
+        [bool] 
+        $SupportsShouldProcess,
+
+        [Parameter()]
+        [string] 
+        $ConfirmImpact,
+
+        [Parameter()]
+        [bool] 
+        $SupportsTransactions,
+
+        [Parameter()]
+        [bool]
+        $NoInvocation,
+         # certain scenarios want to use the generated code as a front end. When true, the generated code will return the arguments only.
+        [Parameter()]
+        [UsageInfo]
+        $Usage,
+
+        [Parameter()]
+        [List[ParameterInfo]]
+        $Parameters,
+
+        [Parameter()]
+        [List[ExampleInfo]]
+        $Examples,
+
+        [Parameter()]
+        [string]
+        $OriginalText,
+
+        [Parameter()]
+        [string[]]
+        $HelpLinks,
+    
+        [Parameter()]
+        [OutputHandler[]]
+        $OutputHandlers
+    
+
+
     )
     $cmd = [Command]::new($Verb, $Noun)
     $cmd.OriginalName = $OriginalName
+    $PSBoundParameters.GetEnumerator() |
+    ForEach-Object {
+        $cmd.$($psitem.Key) = $PSItem.Value
+    }
     $cmd
 }