[string]$TEMP = $env:TEMP,
  [string]$PYTHON = "C:\Python27",
  [string]$StartMenu = "$env:USERPROFILE\AppData\Roaming\Microsoft\Windows\Start Menu\Programs",
 #[string]$UsrFolder = $MyInvocation.MyCommand.Path -replace ("([\\/][^\\/]+){4}$",""),
  [string]$ProgramFiles = "%ProgramFiles(x86)%",
  [string]$AboutLink = "http://freshcode.club/projects/streamtuner2",
  [string]$VERSION = "2.2.0"
)            

#-- paths
$UsrFolder = $MyInvocation.MyCommand.Path -replace ("([\\/][^\\/]+){4}$","")
$UninstallPath = "$UsrFolder\share\streamtuner2\dev\uninstall.cmd"
$ResetPrefsPath = $UninstallPath -replace ("uninstall", "resetprefs")
$ModifyPath = $MyInvocation.MyCommand.Path -replace ("[.]ps1$", ".bat")
$IconPath = "$UsrFolder\share\pixmaps\streamtuner2.ico"

        $MyWindow = $Host.UI.RawUI.WindowSize
        $MyWindow.Height = ($MaxHeight)
        $MyWindow.Width = (80)
        $MyBuffer.Height = (9999)
        #$MyBuffer.Width = (80)
        $host.UI.RawUI.set_bufferSize($MyBuffer)
        $host.UI.RawUI.set_windowSize($MyWindow)

    }
}

#-- create Desktop/Startmenu shortcuts
function Make-Shortcut {
    param($dir, $name, $target, $arg=$false, $parm=$false, [parameter(ValueFromRemainingArguments=$true)]$kwargs=0)
    if (!(Test-Path -Path $dir)) {

    ForEach ($t in $tasks) {
        $t.found = 0
        $t.testpth = $t.testpth -replace "{PYTHON}","$PYTHON"
        if (!$t.regkey -and !$t.testpth) {
            continue
        }
        if ($t.prescn) {  # expression for e.g. registry → path lookup
            Invoke-Expression $t.prescn  # should set $.found + global $PLACEHOLDER variable
        }
        elseif ($t.testpth) {
            if (Test-Path $t.testpth) {
                $t.found = $t.testpth
            }
            elseif ($t.regkey -and (Test-Path $t.regkey)) {
                $t.found = "installer/registry"

}

#-- Operates on parameters of each hash from `$tasks`
#
#  · $title   → print current step
#  · $url     → download from given link, keep as local `$file`
#  · $cmd     → instead of running file, run a custom command
#  · $iargs    → used for MSI installation
#  · $testpth → check for exisiting dir/file
#  · $regkey  → set registry key if successful
#  · $is_opt  → run as expression
#  · $prescn  → used in check-prereq()
#
filter Run-Task {
    # extract flags/vars from $tasks pipe
    $title=""; $cmd=""; $url=""; $iargs=""; $testpth=""; $regkey=""; $is_opt=""; $prescn=""; $_found=""
    ($task = $_).GetEnumerator() | % { Set-Variable -Scope Local -Name $_.key -Value ([regex]::Replace($_.value, "[#{](\w+)[}#]", { param($m) Invoke-Expression ("$"+$m.Groups[1].Value) })) }

    # skip optionals
    if ($is_opt -AND !(Invoke-Expression $is_opt)) { return }

    # print step
    if ($title -match "\d+\.\d+") { $title = "Installing $title" }

        Start-Process -Wait msiexec -ArgumentList /i,"$TEMP\$file", $iargs
        if ($regkey) {
            Set-ItemProperty -Path "$regkey" -Name "WindowsInstaller"  -Value "0"
        }
    }
    # exe
    elseif ($file -match ".+.exe$") {
        write-host -f DarkGray " → $file $iargs"
        if ($iargs) {
            Start-Process -Wait "$TEMP\$file" -ArgumentList $iargs
        }
        else {
            Start-Process -Wait "$TEMP\$file"
        }
    }
    # other files
    elseif ($file) {
        echo " → $file"
        & "$TEMP\$file"
    }
}



#-- run through tasks
Clear-Host
$host.ui.RawUI.BackgroundColor = ($bckgrnd = 'Black')
Console-MaxHeight
Display-Logo
Check-Package
$PYTHON = Check-PythonInstall
$reuseCachedFiles, $optionalInstall = Ask-First
Check-Prerequisites
$tasks | Run-Task  # <-- main loop: process all commands
Any-Key Green