gistfile1.ps1

function include($dep){
  if(-not $__includeContainer){
		$__includeContainer = New-Object "system.collections.generic.hashset[string]"
	}
	$folder = Split-Path $MyInvocation.ScriptName -Parent
	
	$searchPaths = $folder, $__searchPaths
	foreach($path in $searchPaths){
		if(Test-Path "$path\$dep.ps1"){
			$file = "$path\$dep.ps1"
			break
		}
	}	
	if($file){
		$file = (Resolve-Path $file).ProviderPath
		if($__includeContainer.add($file)){
			. $file
		}
	}
}

function register($path){
	if(-not $__searchPaths){
		$__searchPaths = New-Object "system.collections.generic.list[string]"
	}
	$folder = Split-Path $MyInvocation.ScriptName -Parent
	$fullPath = [IO.Path]::GetFullPath("$folder\$path")
	if(-not $__searchPaths.contains("$fullPath")){
		$__searchPaths.add("$fullPath")
	}
}

. register 'libs'
. include 'funcs'
. include 'libfuncs'

& ".\xxx.ps1"
libfuntest