Convert-SVGCropWithInkscape.ps1

function Convert-SVGCropWithInkscape {
    [CmdletBinding()]
    param (
        [parameter( Mandatory, Position = 0, ValueFromPipeline, ValueFromPipelineByPropertyName )]
        [ValidateScript({
            if ($_ -notmatch '[\?\*]') {
                $true
            } else {
                throw 'Wildcard characters *, ? are not acceptable with -LiteralPath'
            }
        })]
        [ValidateNotNullOrEmpty()]
        [Alias('PSPath')]
        [String[]] $LiteralPath,

        [Switch] $RenameOutput,
        [Switch] $Overwrite,
        [Switch] $PlaceInSubfolder,
        [String] $SubfolderName = 'Cropped',
        [Int32] $MaxThreads = 16
    )

    begin {

        $List = [System.Collections.Generic.HashSet[string]]::new()

        try {
            $InkscapeCmd = Get-Command inkscape.com -ErrorAction Stop
        }
        catch {
            throw "Fatal: Inkscape isn't available in PATH."
        }
    }

    process {
        foreach ($Path in $LiteralPath) {
            if(Test-Path -LiteralPath $Path -PathType Leaf){
                if([System.IO.Path]::GetExtension($Path) -eq '.svg'){
                    $List.Add($Path) | Out-Null
                }
                else{
                    Write-Error "Passed file is not an SVG. ($Path)"
                    continue
                }
            }
            else {
                Write-Error "Passed file doesn't exist on disk. ($Path)"
                continue
            }
        }
    }

    end {

        $List | ForEach-Object -Parallel {

            $CurrentSVG       =  $_
            $RenameOutput     =  $Using:RenameOutput
            $PlaceInSubfolder =  $Using:PlaceInSubfolder
            $SubfolderName    =  $Using:SubfolderName
            $FinalOutput      =  $null
            $Overwrite        =  $Using:Overwrite

            $DestFilename = [System.IO.Path]::GetFileName($CurrentSVG)
            $FileParent = [System.IO.Directory]::GetParent($CurrentSVG)

            if($RenameOutput) {
                $DestFilename += '_crop.svg'
            }
            $DestFile = $null

            if($PlaceInSubfolder){
                $FileNewDir = [System.IO.Path]::Combine($FileParent, $SubfolderName)
                if(-not(Test-Path -LiteralPath $FileNewDir -PathType Container)){
                    New-Item -Path $FileNewDir -ItemType Directory -Force | Out-Null
                }
                $DestFile = Join-Path $FileNewDir -ChildPath $DestFilename
            } else {
                $DestFile = Join-Path $FileParent -ChildPath $DestFilename
            }

            $FinalOutput = $DestFile
            if(-not($Overwrite)){
                $FinalOutput = Get-UniqueFileOrFolderNameIfDuplicate -Path $DestFile -IndexSeparator "_"
            }

            $Params = '-o', $FinalOutput, '-D', $CurrentSVG
            & $Using:InkscapeCmd $Params | Out-Null

        } -ThrottleLimit $MaxThreads
    }
}