delete branches with confirmation

deletebranches.ps1

function confirm($message) {
  $reply = Read-Host -Prompt "$message [y/n]"
  return $reply -match "[yY]"
}

git for-each-ref --format='%(refname:short)' refs/heads | `
  where { $_ -ne 'master' } | `
  where { confirm "Delete branch $_ ?" } | `
  foreach { echo "git branch -D $_" }