Git - prune remote origin and delete local branches

prune-old-branches.sh

#!/bin/bash

#
# Written by Robert Vojta <robert@tapmates.com>
#
# This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.
#
# http://creativecommons.org/licenses/by-sa/3.0/
#

#
# What it does ...
#
#  - gets list of local branches (master and current branch is skipped)
#  - gets list of remote branches (master, HEAD are skipped)
#  - if local branch doesn't exist in remote branches list, it will be deleted
#
# ... that's all. Simple, but be aware, your local branches are going to be deleted!
#

OIFS="$IFS"
IFS=$(echo -en "\n\b" )

#
# Prune remotes
#
echo -ne "Fetching changes ... "
git fetch &> /dev/null
echo -ne "done\nPruning remote origin ... "
git remote prune origin &> /dev/null
echo "done"

#
# List of branches
#

trim() { echo $1 | sed 's/^ *//g' | sed 's/ *$//g'; }

echo -e "\nLocal branches"
declare -a LBRANCHES
for line in $( git branch -l | grep -v \* ); do
	BRANCH=$(trim $line)
	if [ "$BRANCH" != "master" ]; then	
		LBRANCHES=("${LBRANCHES[@]}" "$BRANCH")
		echo "  $BRANCH"
	fi
done

if [ ${#LBRANCHES[@]} -eq 0 ] ; then
	echo -e "\nNo local branches, nothing to do"
	IFS="$OIFS"
	exit 0
fi

echo -e "\nRemote branches"
declare -a RBRANCHES
for line in $( git branch -r | grep -v \* ); do
	BRANCH=$(trim ${line/origin\//})
	if [[ ! "$BRANCH" =~ HEAD|master ]]; then
		RBRANCHES["$BRANCH"]=1
		echo "  $BRANCH"
	fi
done

#
# Get local branches to delete
#

declare -a DBRANCHES
for BRANCH in "${LBRANCHES[@]}"; do
	if [[ ! ${RBRANCHES["$BRANCH"]} ]]; then
		DBRANCHES=("${DBRANCHES[@]}" "$BRANCH")
	fi
done

if [ ${#DBRANCHES[@]} -eq 0 ] ; then
	echo -e "\nNo local branches to delete, nothing to do"
	IFS="$OIFS"
	exit 0
fi

echo -e "\nList of local branches to delete"
for BRANCH in "${DBRANCHES[@]}"; do
	echo " $BRANCH"
done

echo -e "\nBranches listed above will be deleted! There's no way to go back!"
echo -en "\nProceed? (Y/n):"
read proceed

if [ "$proceed" == "Y" ]; then
	for BRANCH in "${DBRANCHES[@]}"; do
		echo -en "\nDeleting branch $BRANCH ... "
		git branch -D "$BRANCH" &> /dev/null 
		if [[ $? -eq 0 ]]; then
			echo "done"
		else
			echo "failed"
		fi
	done
fi

IFS="$OIFS"