Git subcommand for sync'ing a working copy's branches and tags

git-sync

#!/usr/bin/env bash
set -eu -o pipefail

echo "Pruning local tracking branches that don't exist anymore on the remote…"
git update

echo "Pruning local branches that have been merged…"
echo "Note: top-level branches are considered protected, only branches with a / in their name will be deleted."
git branch --format '%(refname:lstrip=2)' --merged | grep '/' || true | xargs -n 1 git branch -d

echo "Synchronizing tags with remote…"
git tag -l | xargs -n 1 git tag -d && git fetch --tags