[CmdletBinding()]param(
    [switch]$Expand,
    [Parameter(ValueFromPipeline,ValueFromPipelineByPropertyName,Position=0)]
    [Alias("FullName")]
    [string[]]$Path
)
process {

    function Get-FullPath {
        param([string]$Path)

        if([System.IO.Path]::IsPathRooted($Path)){
            [System.IO.Path]::GetFullPath($Path)
        }else{
            [System.IO.Path]::GetFullPath((Join-Path $PWD $Path))
        }
    }

    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 $m).FullName)
                }
            }
        }

        if([System.IO.Path]::IsPathRooted($p)){
            $p = [System.IO.Path]::GetFullPath($p)
        }else{
            $p = [System.IO.Path]::GetFullPath((Join-Path $PWD $p))
        }

        if( $Expand ) {
            $p = $p | Get-Item | Select-Object -ExpandProperty FullName
        }

        $p
    }
}
# try {
#     get-item $Path -Force -ErrorAction Stop | 
#         Select-Object -ExpandProperty FullName
# } catch {
#     $_.targetObject
# }