git-clean-merged.sh

#!/bin/bash -ue
# Christian "Superstar" Bryn <chr.bryn@gmail.com> 1850-2017

function print_usage {
  cat <<EOF
Usage: ${0} [-h|-a|-b|-q] <branch1> [<branch2>]
  -h    Print usage
  -a    All - automatically check all branches and delete if merged.
  -b    Batch - skip 'destructive action' warning.
  -q    Quiet - turn off verbosity.

Examples:
  ${0} my-feature-branch
  ${0} -a
EOF
}

all="false"
batch="false"
while getopts abhq o
do
  case $o in
    h)
    print_usage ; exit ;;
    a)
    all="true" ;;
    b)
    batch="true" ;;
    q)
    verbose="false" ;;
  esac
done
shift $(($OPTIND-1))

if [[ "${all}" == "true" ]]
then
  if [[ "${batch}" == "false" ]]
  then
    echo "This cleanup can be crude - be sure to know what you're doing"
    echo "Press ENTER to continue, or CTRL+C to abort."
    read
  fi
  true
  branches=$(git branch -r --merged origin/master | grep origin | grep -v '>' | grep -v master | xargs -L1 | cut -d"/" -f2- )
else
  [[ $# -eq 0 ]] && { echo ">> No branches specified"; print_usage; exit 1; }
  branches="$@"
fi

for branch in ${branches}; do
  git branch | grep -q ${branch} || { echo ">> '${branch}' does not seem to be a valid (local) branch, skipping"; continue; }
  [[ "${all}" == "true" ]] && echo ">>> found merged branch ${branch}"
  echo ">> deleting local branch first..." && \
  git branch -d "${branch}" && \
  echo ">> deleting remote branch" && \
  git push origin --delete "${branch}"
done