nixpkgs-update/delete-merged.sh

#! /usr/bin/env bash
set -euxo pipefail

git fetch --prune origin
git fetch --prune upstream

git checkout master
git reset --hard upstream/master

git branch -ra --merged | grep "origin/auto-update/" | sed -e 's|^  remotes/origin/\(.*\)|git push origin :\1|' | while IFS= read -r line; do eval "$line"; done || true

git branch -a --merged | grep "auto-update/" | sed -e 's|^\(.*\)|git branch -d \1|' | while IFS= read -r line; do eval "$line"; done