Remove-EmptyDirectories.ps1

# this is one of Stéphane BARIZIEN's public domain scripts
# the most recent version can be found at:
# https://gist.github.com/sba923/571e7b02bddab9c587ee97110b898629#file-remove-emptydirectories-ps1

param([string] $Path, [switch] $IgnoreSystemFiles, [switch] $torecyclebin, [switch] $ContinueOnErrors)

if (!(Test-Path -Path $Path))
{
    throw("'{0}' not found" -f $Path)
}

Set-StrictMode -Version 2.0

$VerbosePreference = 'Continue'

$systemfiles = @('thumbs.db', 'desktop.ini', 'PPMetaData.bin', '.ppinfocache', 'ZbThumbnail.info', 'PCM.db')

# derived from http://stackoverflow.com/questions/502002/how-do-i-move-a-file-to-the-recycle-bin-using-powershell

Add-Type -AssemblyName Microsoft.VisualBasic

function Remove-Item-ToRecycleBin($Path)
{
    $item = Get-Item -Path $Path -ErrorAction SilentlyContinue
    if ($null -eq $item)
    {
        Write-Error("'{0}' not found" -f $Path)
    }
    else
    {
        $fullpath = $item.FullName
        Write-Verbose ("Moving '{0}' to the Recycle Bin" -f $fullpath)
        if (Test-Path -LiteralPath $fullpath -PathType Container)
        {
            [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteDirectory($fullpath, 'OnlyErrorDialogs', 'SendToRecycleBin')
        }
        else
        {
            [Microsoft.VisualBasic.FileIO.FileSystem]::DeleteFile($fullpath, 'OnlyErrorDialogs', 'SendToRecycleBin')
        }
    }
}

function IsEmptyOrContainsOnlySystemFiles([string] $Path, [switch] $IgnoreSystemFiles)
{
    $contents = (Get-ChildItem -Force -LiteralPath $Path | Where-Object { (!$IgnoreSystemFiles) -or ($_.Name -notin $systemfiles) })
    if ($null -eq $contents)
    {
        return $true
    }
    else
    {
        if ($contents.GetType().Name -match '(File|Directory)Info')
        {
            return $false
        }
        else
        {
            return($contents.Count -eq 0)
        }
    }
}


function Remove-EmptyDirectories([string] $Path, [switch] $IgnoreSystemFiles, [switch] $torecyclebin)
{
    Write-Debug ("Processing subdirectories within '{0}'" -f $Path)

    try
    {
        Get-ChildItem -Force -Directory -LiteralPath $Path | Foreach-Object {
            Remove-EmptyDirectories -path $_.FullName -ignoresystemfiles:$IgnoreSystemFiles -torecyclebin:$torecyclebin
        }
    
        if (IsEmptyOrContainsOnlySystemFiles -path $Path -ignoresystemfiles:$IgnoreSystemFiles)
        {
            $contents = Get-ChildItem -Force -Recurse -LiteralPath $Path
            if ($null -eq $contents)
            {
                Write-Debug ("Removing empty directory '{0}'" -f $Path)
            }
            else
            {
                Write-Debug ("Removing '{0}' with the following contents:" -f $Path)
                $contents | ForEach-Object {
                    Write-Debug("{0}" -f $_.FullName)
                }
            }
    
    
            if ($torecyclebin)
            {
                Remove-Item-ToRecycleBin -Path $Path
            }
            else
            {
                Remove-Item -Force -Recurse -Verbose -LiteralPath $Path -ErrorAction SilentlyContinue
                # retry without -Force if failed with -Force
                if (Test-Path -LiteralPath $Path)
                {
                    Remove-Item -Recurse -Verbose -LiteralPath $Path
                    if (!$? -and !$ContinueOnErrors)
                    {
                        Exit(1)
                    }
                }
            }
        }
        else
        {
            Write-Debug("'{0}' is NOT empty" -f $Path)
        }
    
    }
    catch
    {
        Write-Error ("EXCEPTION: " + $_)
    }
}

if (-not $PSBoundParameters.ContainsKey('Path'))  # testing (typically: running via F5 under ISE)
{
    $DebugPreference = 'Continue'
    # create test data
    $testroot = $env:TEMP + '\a'
    Remove-Item -Force -Recurse -LiteralPath $testroot -ErrorAction SilentlyContinue
    mkdir $testroot | Out-Null
    mkdir "$testroot/b" | Out-Null
    mkdir "$testroot/c" | Out-Null
    mkdir "$testroot/c/d" | Out-Null
    "foo" | out-file "$testroot/c/d/file_in_d"
    mkdir "$testroot/b/e" | Out-Null
    mkdir "$testroot/b/e/f" | Out-Null
    mkdir "$testroot/b/e/f/g" | Out-Null
    "foo" | Out-File -FilePath "$testroot/b/e/f/g/thumbs.db"
    "foo" | Out-File -FilePath "$testroot/b/e/thumbs.db"
    "foo" | Out-File -FilePath "$testroot/b/e/file_in_e"


    Remove-EmptyDirectories -path $testroot -ignoresystemfiles:$true -torecyclebin:$true

    if (Test-Path -LiteralPath $testroot)
    {
        Invoke-Item -LiteralPath $testroot
    }
    else
    {
        Write-Host -Object ("'{0}' has been completely removed" -f $testroot)
    }
}
else
{
    Remove-EmptyDirectories -path $Path -ignoresystemfiles:$IgnoreSystemFiles -torecyclebin:$torecyclebin
}