Commands/AutomaticVariables/My-AutomaticVariables.ps1
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# Declares various 'my' automatic variables function PipeScript.Automatic.Variable.MyCallstack { <# .SYNOPSIS $MyCallStack .DESCRIPTION $MyCallstack is an automatic variable that contains the current callstack. #> @(Get-PSCallstack) # Set $MyCallstack } function PipeScript.Automatic.Variable.MySelf { <# .SYNOPSIS $MySelf .DESCRIPTION $MySelf contains the currently executing ScriptBlock. A Command can & $myself to use anonymous recursion. .EXAMPLE { $mySelf } | Use-PipeScript .EXAMPLE # By using $Myself, we can write an anonymously recursive fibonacci sequence. Invoke-PipeScript { param([int]$n = 1) if ($n -lt 2) { $n } else { (& $myself ($n -1)) + (& $myself ($n -2)) } } -ArgumentList 10 #> $MyInvocation.MyCommand.ScriptBlock # Set $mySelf } function PipeScript.Automatic.Variable.MyParameters { <# .SYNOPSIS $MyParameters .DESCRIPTION $MyParameters contains a copy of $psBoundParameters. This leaves you more free to change it. .EXAMPLE Invoke-PipeScript -ScriptBlock { $MyParameters } #> [Ordered]@{} + $PSBoundParameters } function PipeScript.Automatic.Variable.MyCaller { <# .SYNOPSIS $MyCaller .DESCRIPTION $MyCaller (aka $CallStackPeek) contains the CallstackFrame that called this command. .EXAMPLE Invoke-PipeScript { $myCaller } #> [Alias('Automatic.Variable.CallstackPeek')] param() $myCallStack=@(Get-PSCallstack) $myCallStack[-1] # Initialize MyCaller } function PipeScript.Automatic.Variable.MyCommandAst { <# .SYNOPSIS $MyCommandAst .DESCRIPTION $MyCommandAst contains the abstract syntax tree used to invoke this command. .EXAMPLE & (Use-PipeScript { $myCommandAst }) #> param() $MyCaller=$($myCallStack=@(Get-PSCallstack) $myCallStack[-1]) if ($MyCaller) { $myInv = $MyInvocation $MyCaller.InvocationInfo.MyCommand.ScriptBlock.Ast.FindAll({ param($ast) $ast.Extent.StartLineNumber -eq $myInv.ScriptLineNumber -and $ast.Extent.StartColumnNumber -eq $myInv.OffsetInLine -and $ast -is [Management.Automation.Language.CommandAst] },$true) } } |