delete local git branches that were deleted remotely

cleanup.ps1

function Remove-Unused-Branches {
	$refsToDelete = git for-each-ref --format '%(refname:short) %(upstream:track)' |
	ForEach-Object {
		$ref, $upstream = $_ -split '\s+'

		if ($upstream -eq '[gone]') {
			Write-Output $ref
		}
	}

	Write-Host "Following refs will be deleted:"
	$refsToDelete

	Write-Host "Do you want to continue and delete these refs? (Y/N)"
	$userInput = Read-Host

	if ($userInput -eq 'Y') {
		$refsToDelete | ForEach-Object {
			git branch -D $_
		}
	} else {
		Write-Host "Skipping deletion of refs"
	}
}

$alias:cleanup = "Remove-Unused-Branches"