Can't run script that runs another script found in its $PSScriptRoot

[sba923]

Consider this Parent.ps1:

$script = Join-Path -Path $PSScriptRoot -ChildPath 'Child.ps1'
& $script -arg 'somearg'

that invokes this Child.ps1:

param([string] $arg)
Write-Host("Child.ps1 called with '-arg $arg'")

Running Parent.ps1 (expectedly) yields:

Child.ps1 called with '-arg somearg'

but Measure-Script -Path Parent.ps1 fails:

Measure-Script : Cannot bind argument to parameter 'Path' because it is an empty string.
At line:1 char:1
+ Measure-Script -path ../Parent.ps1
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidData: (:) [Measure-Script], ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorEmptyStringNotAllowed,Measure-Script

[IISResetMe]

Thanks for reporting this @sba923!

This is due to how we "rewrite" the AST in-memory, so by the time we execute it, it's no longer actually a script.

We might be able to inject meaningful $PSScriptRoot/$PSCommandPath vars, but $MyInvocation will still not reflect the original script (just FYI)

[IISResetMe]

This is fixed in #8