Download Nalimov table bases (3/4/5)

download-tablebases

[cmdletbinding()]
param()

function DownloadTablebases{
    [cmdletbinding()]
    param(
        $baseUrl = 'http://www.chesskit.com/download/nalimov',
        $allFilename = 'all.txt',
        $downloadRoot = ($pwd)
    )
    process{
        try{
            Push-Location
            Set-Location $downloadRoot

            # check for the all.txt, if it's not there then download it
            $allTxtPath = (Join-Path $downloadRoot $allFilename)
            if(-not (Test-Path $allTxtPath)){
                $allUrl = "$baseUrl/$allFilename"
                'Downloading all file from [{0}] to [{1}]' -f $allUrl, $allTxtPath | Write-Verbose
                Invoke-WebRequest -Uri $allUrl -OutFile $allTxtPath
            }

            Get-Content $allTxtPath | % {
                $currentline = $_
                if(-not [string]::IsNullOrWhiteSpace($currentline)){
                    $currentline = $currentline.trim()
                }

                if([string]::Compare($allFilename,$currentline,[System.StringComparison]::OrdinalIgnoreCase) -ne 0){
                    # see if the file exists locally and if not then redownload it
                    $currentfile = (Join-Path $downloadRoot $currentline)
                    if(-not(Test-Path $currentfile)){
                        $dlurl = "$baseUrl/$currentline"
                        'Downloading file from [{0}] to [{1}]' -f $baseUrl, $currentfile | Write-Verbose
                        Invoke-WebRequest -Uri $dlurl -OutFile $currentfile
                    }
                }
            }
        }
        finally{
            Pop-Location
        }
    }
}

DownloadTablebases