<#
.SYNOPSIS
    Parses parameters of the package

.EXAMPLE
    Get-PackageParameters "/Shortcut /InstallDir:'c:\program files\xyz' /NoStartup" | set r
    if ($r.Shortcut) {... }
    Write-Host $r.InstallDir

.OUTPUTS
    [HashTable]
#>
function Get-PackageParameters {
    [CmdletBinding()]
    param(
       [string] $Parameters = $Env:ChocolateyPackageParameters,
       # Allows splatting with arguments that do not apply and future expansion. Do not use directly.
       [parameter(ValueFromRemainingArguments = $true)]
       [Object[]] $IgnoredArguments
    )

    $res = @{}

    $re = "\/([a-zA-Z0-9]+)(:[`"'].+?[`"']|[^ ]+)?"
    $results = $Parameters | Select-String $re -AllMatches | Select-Object -Expand Matches
    foreach ($m in $results) {
        if (!$m) { continue } # must because of posh 2.0 bug: https://github.com/chocolatey/chocolatey-coreteampackages/issues/465

        $a = $m.Value -split ':'
        $opt = $a[0].Substring(1); $val = $a[1..100] -join ':'
        if ($val -match '^(".+")|(''.+'')$') {$val = $val -replace '^.|.$'}
        $res[ $opt ] = if ($val) { $val } else { $true }
    }
    $res
}