PowerShell-friendly docker ps parsing

dockerps.ps1

function PascalName($name){
    $parts = $name.Split(" ")
    for($i = 0 ; $i -lt $parts.Length ; $i++){
        $parts[$i] = [char]::ToUpper($parts[$i][0]) + $parts[$i].SubString(1).ToLower();
    }
    $parts -join ""
}
function GetColumnInfo($headerRow, $propertyNames){
    $lastIndex = 0
    $lastName = $null
    $propertyNames | %{ 
        $nextIndex = $headerRow.IndexOf($_, $lastIndex) 
        if ($lastName -ne $null) {
            New-Object PSObject -Property @{ HeaderName = $lastName; Name = PascalName $lastName; Start=$lastIndex; End=$nextIndex}
        }
        $lastIndex = $nextIndex
        $lastName = $_
    }
    New-Object PSObject -Property @{ HeaderName = $lastName; Name = PascalName $lastName; Start=$lastIndex; End=-1}
}
function ParseRow($row, $columnInfo) {
    $values = @{}
    $columnInfo | % {
        if ($_.End -lt 0) { 
            $len = $row.Length - $_.Start
        } else {
            $len = $_.End - $_.Start
        }
        $values[$_.Name] = $row.SubString($_.Start, $len)
    }
    New-Object PSObject -Property $values
}
function ExtractPsInfo(){
    begin{
        $propertyNames = @('CONTAINER ID', 'IMAGE', 'COMMAND', 'CREATED', 'STATUS', 'PORTS', 'NAMES')
        $positions = $null;
    }
    process {
        if($positions -eq $null) {
            # header row => determine column positions
            $positions  = GetColumnInfo -headerRow $_  -propertyNames $propertyNames
        } else {
            # data row => output!
            ParseRow -row $_ -columnInfo $positions
        }
    }
    end {
    }
}
## TODO - move to generic version
#function DockerParse($propertyNames){
#
#    begin{
#        $positions = $null;
#    }
#    process {
#        if($positions -eq $null) {
#            # header row => determine column positions
#            $positions  = GetColumnInfo -headerRow $_  -propertyNames $propertyNames
#        } else {
#            # data row => output!
#            ParseRow -row $_ -columnInfo $positions
#        }
#    }
#    end {
#    }
#}


# e.g. :
# docker --tls ps -a --no-trunc | ExtractPsInfo | ft