macOS stale local branches for github squash and merge

git.sh

function git_list_remote_branches() {
  git ls-remote --heads -q | awk '{ gsub("refs/heads/",""); print $2 }' | sort
}

function git_list_local_branches() {
  git branch --format='%(refname:short)' | sort
}

function git_local_stale_branches() {
  comm -13 <(git_list_remote_branches) <(git_list_local_branches)
}

alias gbstale='git_local_stale_branches'