Loseless Merging Directories with Powershell

 

I needed a nice little function for merging directories without loosing documents in case of collisions of paths. Because i needed this for tidying up a hell of messed up homedrives i didnt care about any ACL etc.

function MoveCollisionFree([string]$srcdir,[string]$dstdir){
$srcdir = $srcdir.TrimEnd('\')
$dstdir = $dstdir.TrimEnd('\')
$srcRegEx=[regex]::Escape($srcdir)

[System.IO.Directory]::GetDirectories($srcdir).ForEach({
$DestPath=$_ -replace($srcRegEx,$dstdir)
if([System.IO.Directory]::Exists($DestPath)){
MoveCollisionFree -srcdir $_ -dstdir $DestPath
}else{[System.IO.Directory]::Move($_,$DestPath)}
})
[System.IO.DirectoryInfo]::new($srcdir).GetFiles().ForEach({
$DestFile=[System.IO.FileInfo]::new($($_.FullName -replace($srcRegEx,$dstdir)))
if($DestFile.Exists){
if($DestFile.LastWriteTime -ge $_.LastWriteTime){
$_.MoveTo("$($DestFile.Directory.FullName)\$($_.BaseName)_older_from_$($_.LastWriteTime.ToString('yyyy-MM-dd'))$($_.Extension)")
}else{
$NewFileName=$DestFile.FullName
$DestFile.MoveTo("$($DestFile.Directory.FullName)\$($_.BaseName)_older_from_$($DestFile.LastWriteTime.ToString('yyyy-MM-dd'))$($_.Extension)")
$_.MoveTo($NewFileName)
}
}else{$_.MoveTo($DestFile.FullName)}
})
Remove-Item $srcdir -Recurse -Force -Confirm:$false
}