Prune local/remote refs and delete remote branches that have been merged to master

githelpers.sh

prune_merged() {
  # TODO: Test for origin/master vs. master instead.
  test -n "$1" && prune_merged_remotes $@ || prune_merged_local
}

prune_merged_local() {
  git branch --list --merged |
    grep --invert-match --extended-regexp '\*|master' |
    xargs -n 1 git branch --delete
}

prune_merged_remotes() {
  git fetch origin
  git remote prune origin
  git branch --list --remote --merged $1 |
    grep --invert-match --extended-regexp "HEAD|master|$1" |
    sed 's/ *origin\///' |
    xargs -p -I branch git push origin :branch
}