Git-Sync Powershell function

git-sync.ps1

function Git-Sync {
    git fetch --all --prune;
    $alive = git for-each-ref refs/remotes --format '%(refname)';
    $dead = git for-each-ref refs/heads --format '%(if)%(push)%(then)%(refname:short):%(push)%(end)' `
        | ?{ ($_ -split ':')[1] -and -not (($_ -split ':')[1] -in $alive) } `
        | %{ ($_ -split ':')[0] };
    if ($dead) {
        $current = git name-rev --name-only HEAD;
        if ($current -in $dead) {
            Write-Host "Branch '$current' about to be deleted."
            $newb = Read-Host -Prompt "git checkout: [master] "
            if ($newb) {
                git checkout $newb;
            } else {
                git checkout master;
            }
        }
        git branch -D $dead;
    }
    git pull;
}