Powershell Exception Helper

Powershell does not really have a good way to log and handle exceptions. You can find a bunch of articles on the Trap keyword and what can be done with it. Here is one great article on the topic. Having said that, my co-worker 'AC' did it again and created this wonderful helper file which I figured I would share with you. You can use this code inside every function at the first line. This works very well if you have many posh scripts being called:

function MyFunction($param1, $param2)
{
trap { TrackError }
....
}

$global:trackedErrorHashCode = $null

function TrackError
{
   $err = $error[0]
   $hashCode = $err.GetHashCode()
  
   if($global:trackedErrorHashCode -eq $hashCode) {
       return
   }
   else {
       $global:trackedErrorHashCode = $hashCode
   }

   $text = BuildErrorMessage $err
   WriteErrorMessage $text
   SaveErrorMessage $text
  
   throw $err
}

function BuildErrorMessage($err)
{
   $text = ""
   $text += FormatAsLine "Error ----------------------"
   $text += FormatAsLine
   $text += FormatAsLine "$($err.InvocationInfo.InvocationName): $($err)"
   $text += FormatAsLine $err.InvocationInfo.PositionMessage
   $text += FormatAsLine
   $text += FormatAsLine "$($err.Exception.GetType().Name)"
   $text += FormatAsLine
  
   $text += FormatAsLine "StackTrace -----------------"
   $text += FormatAsLine
   $info = $err.InvocationInfo
   $stack = Get-PSCallStack
  
   $text += FormatCallStackLine $stack[2].command $info.ScriptName $info.ScriptLineNumber
  
   $stack[3..$stack.length] | % {
       $text += FormatCallStackLine $_.Command $_.ScriptName $_.ScriptLineNumber
   }
   $text += FormatAsLine "----------------------------"

   $text
}

function FormatAsLine($text)
{
   $text + "`n"
}

function FormatCallStackLine($command, $file, $lineNumber)
{
   "  At '$command' in $($file):$lineNumber`n"
}

function WriteErrorMessage($text)
{
   Write-Host $text -fore green
}

$global:_savedErrorMessages = @()

function SaveErrorMessage($text)
{
   $global:_savedErrorMessages += $text
}

function GetErrorMessages()
{
   $global:_savedErrorMessages
}