Importing “libraries” in powershell

# to load c:powershellscriptscluster_utils.ps1 if it isn't already loaded
. require cluster_utils

$global:loaded_scripts=@{}
function require([string]$filename){
      if (!$loaded_scripts[$filename]){
           . c:powershellscripts$filename.ps1
           $loaded_scripts[$filename]=get-date
     }
}

function reload($filename){
     . c:powershellscripts$filename.ps1
     $loaded_scripts[$filename]=get-date
}

$global:scriptdirectory = 'C:powershellscripts'
$global:loaded_scripts = @{}

function require {
  param(
    [string[]]$filenames=$(throw 'Please specify scripts to load'),
    [string]$path=$scriptdirectory
  )

  $unloadedFilenames = $filenames | where { -not $loaded_scripts[$_] }
  reload $unloadedFilenames $path
}

function reload {
  param(
    [string[]]$filenames=$(throw 'Please specify scripts to reload'),
    [string]$path=$scriptdirectory
  )

  foreach( $filename in $filenames ) {
    . (Join-Path $path $filename)
    $loaded_scripts[$filename] = Get-Date
  }
}

$global:scriptdirectory= 'c:powershellscripts'
$global:loaded_scripts=@{}
function require(){
      param ([string]$filename, [string]$path=$scriptdirectory)
      if (!$loaded_scripts[$filename]){
           . (Join-Path $path $filename)
           $loaded_scripts[$filename]=get-date
     }
}

function reload(){
     param ([string]$filename, [string]$path=$scriptdirectory)
     . (Join-Path $path $filename)
     $loaded_scripts[$filename]=get-date
}