gitclean.sh

#!/bin/bash
#
# Bash script to clean up stray branches that have no "upstream" branch
#
# USE AT OWN RISK
#
# gitclean [--no-interactive]
#
# - no-interactive: Automatically deletes the branch, without showing the diff
#                   and asking for confirmation

# Upstream name
UPSTREAM_REMOTE="origin"

set -e

NO_INTERACTIVE="0"

if [ "$1" = '--no-interactive' ]; then
	NO_INTERACTIVE="1"
fi

BRANCHES=$(git branch --no-color | grep -v "^* " | grep -v "^master$" | grep -v "stable9")

for BRANCH in $BRANCHES
do
	HAS_UPSTREAM="$(git branch -a --no-color | grep remotes/$UPSTREAM_REMOTE/$BRANCH | wc -l)"

	if [ "$HAS_UPSTREAM" = "0" ]; then
		if [ "$NO_INTERACTIVE" = "1" ]; then
		    	git branch -D $BRANCH
			continue
		fi

		echo "#"
		echo "# Branch: $BRANCH"
		echo "#"
		echo ""
		git --no-pager show $BRANCH
		echo ""

		echo "#"
		echo "#"
		read -p "# Branch $BRANCH has no $UPSTREAM_REMOTE branch, delete? [y/n] " -n 1 -r
		echo    # (optional) move to a new line
		if [[ $REPLY =~ ^[Yy]$ ]]; then
		    	git branch -D $BRANCH
		fi
	fi

done