How to add filters to release note generation

ReleaseNotesWithFilter.ps1

function Get-Mode
{
    Param(
       $line
    )

     $returnvalue = "" | Select-Object -Property mode, skipLogic
    
     $mode = [Mode]::BODY
     if ($line.StartsWith("@@WILOOP@@")) {$mode = [Mode]::WI}
     if ($line.StartsWith("@@CSLOOP@@")) {$mode = [Mode]::CS}
	 if ($line.StartsWith("@@BUILDLOOP@@")) {$mode = [Mode]::BUILD}
     $returnvalue.Mode = $mode
    
     if ($mode -ne [Mode]::BODY)
     {
        #check if there is any filter logic
        $array = $line -split ' ',2
        if ( $array[1] -eq $null)
        {
           $returnvalue.skipLogic = " " # use a space as command
            
        } else
        {
           $returnvalue.skipLogic = $array[1]
        }
     }  
     
    $returnvalue
  
}

function Render() {
    [CmdletBinding()]
    param ( [parameter(ValueFromPipeline = $true)] [string] $str)

    #buggy in V4 seems ok in older and newer
    #$ExecutionContext.InvokeCommand.ExpandString($str)

    "@`"`n$str`n`"@" | iex
}

Add-Type -TypeDefinition @"
   public enum Mode
   {
      BODY,
      WI,
      CS,
      BUILD
   }
"@


"A line with a filter"
$myval = 'hello'
$line = "@@WILOOP@@ ('`$myval' -eq 'hello') "
$x = Get-Mode $line
"  The line mode is - $($x.mode)"
"  The filter logic is - $($x.skiplogic)"
"  The render does not exec the filter test, just expands the variable - $($x.skipLogic | render)"
"  The invoke does evaluates the filter test - $(Invoke-Expression $x.skipLogic)"

"A line with no filter"
$myval = 'hello'
$line = "@@WILOOP@@"
$x = Get-Mode $line
"  The line mode is - $($x.mode)"
"  The filter logic is - $($x.skiplogic)"
"  The render does not exec the filter test, just expands the variable - $($x.skipLogic | render)"
"  The invoke does evaluates the filter test - $(Invoke-Expression $x.skipLogic)"

For discussion of the background to this sample see Issue #35