[CmdletBinding()]param(
    [switch]$Expand,
    [Parameter(ValueFromPipeline,ValueFromPipelineByPropertyName,Position=0)]
    [Alias("FullName")]
    [string[]]$Path
)
process {
    foreach( $local:p in $Path ) {
        switch( $p[0] ) {
            '@' { $p = Join-Path $MyPSScriptRoot $p.Substring(1) }
            '~' {
                if( $p -match '^~[^/]*' ) {
                    $local:m = $Matches[0]
                    $p = $p -replace "^$m",((Get-Item -Force $m).FullName)
                }
            }
        }

        # clean end of path from DirectorySeparatorChars
        $p = $p -replace '[/\\]+$',''

        $p = $p -replace '#C-','#C-#' -replace '\*','#C-A#' -replace '\?','#C-Q#'
        if([System.IO.Path]::IsPathRooted($p)){
            $p = [System.IO.Path]::GetFullPath($p)
        }else{
            $p = [System.IO.Path]::GetFullPath((Join-Path $PWD $p))
        }
        $p = $p -replace '#C-A#','*' -replace '#C-Q#','?' -replace '#C-#','#C-'

        if( $p -match '\*|\?' -and $Expand ) {
            $p = $p | Where-Object { Test-Path $_ } |
                Get-Item -Force |
                Select-Object -ExpandProperty FullName
        }

        $p
    }
}