Downloads all DAP charts from AirServices

Get-AirServicesCharts.ps1

# Downloads all aero charts from Airservices
$hostUri = "http://www.airservicesaustralia.com/aip/current/dap/AeroProcChartsTOC.htm"
$fileTypesToDownload = @("pdf")

# Download the page of charts
$links = Invoke-WebRequest $hostUri | select -ExpandProperty links
# Get a webclient ready for downloading files
$webClient = New-Object System.Net.WebClient

foreach ($link in $links) { 
    # Is the link of a file type we want to grab?
    if ($fileTypesToDownload -contains $link.href.split(".")[-1]) {
        # Build a file title    
        $localPath = Join-Path $pwd $("Y" + $link.href.substring(0,3) + " " + $link.innerText + "." + $link.href.split(".")[-1])
        # Build the URL (ASA always seem to use relative links here)
        $linkUri = ((Split-Path $hosturi) + "/" + $link.href).Replace("\","/")
        # Download the file
        "Downloading $linkUri to $localPath"
        try { 
            $webClient.DownloadFile($linkUri,$localPath)
        } catch {
            Write-Error "Failed to get $linkuri"
        }
    }
}