Clean up stale local git branches

git-clean-branches

#!/bin/bash
#
# Cleans up stale local branches.
#
# Checks for local branches that used to have a remote branch
# but that branch no longer exists. If the branch has no local
# changes that have not been merged into a specific branch then
# the branch is deleted.
#

MERGED_BRANCH_TO_CHECK=master

git rev-parse --is-inside-work-tree &>/dev/null
if [[ $? -ne 0 ]]
then
  echo "Not in a git repository!"
  exit 1
fi

git fetch --prune

branches_without_remote=$(git branch -avv | grep gone | sed 's/\*//g' | awk '{ print $1; }')

for branch in $branches_without_remote
do
  remote_branches_containing_branch=$(git branch -r --contains $branch | grep $MERGED_BRANCH_TO_CHECK)
  if [[ -n $remote_branches_containing_branch ]]
  then
    git branch -D $branch
  else
    echo "Not deleting branch $branch as it has local changes that have not been merged into $MERGED_BRANCH_TO_CHECK"
  fi
done