qlive-launcher.ps1

Param
  (
    [Parameter(Mandatory=$false)]
    [ValidatePattern("qlive://[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+:[0-9]{5}/\S+")]
    [string]$uri
  )

$log_file = "$Env:TMP\quakelive_launcher.log"
if (Test-Path $log_file) {
  $path, $arg = Select-String -Path $log_file -CaseSensitive -Pattern "^(?:Engine path|Launch parameters): (.*)" | 
    %{ $_.Matches[0].Groups[1].Value }
} else {
  [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
  [System.Windows.Forms.MessageBox]::Show("log missing, use Launcher and try again")
  exit
}
if ($uri) {
  $arg += $uri -replace 'qlive://([^/]*)/(.*)', '+wait 500 +password $2 +connect $1'
}
Start-Process "$path\quakelive.exe" "$arg"