git: Find all merged ancestors branches and create commands to delete them.

README.md

To find all ancestor branches

./get_ancestor_branches.sh

To create the delete commands for all ancestor branches and echo them as text (not invoking them)

./get_ancestor_branches.sh | ./delete_branches.sh

To invoke the delete commands to actually perform the work

./get_ancestor_branches.sh | ./delete_branches.sh | bash -

delete_branches.sh

#!/bin/bash

# Input: takes a list of git branches as input.
# Output: outputs a list of git commands to delete the input branches.
#
# Great post on deleting branches in git:
# http://stackoverflow.com/a/23961231/123781

# Set `input` to grab the first argument, or the stdin.
[ $# -ge 1 -a -f "$1" ] && input="$1" || input=$(cat)

# Loop over each branch, creating command to delete from local and remote git repo
for branch in ${input[@]}; do
	case "$branch" in
		origin/* ) 
			# handle remotes/origin case
			branchName="$(echo $branch | sed 's/origin\///')"
			command="git push origin --delete $branchName"
		;;
		*)
			# handle the local branch case
			command="git branch -d $branch"
		;;
	esac

	echo $command
done

get_ancestor_branches.sh

#!/bin/bash

# Find all local and remote ancestor branches that have been merged into the root branch

# ---------
# Config

# Set the root branch name.
# e.g. if you want to find all ancestors of master, 
# then set this to use `origin/master`
ROOT_BRANCH=origin/master
# Get the hash of the parent repo
ROOT_HASH="$(git rev-parse $ROOT_BRANCH 2>&-)"

# A list of protected repos that should never be operated on automatically
# meaning this script will _not_ create delete commands for these branches.
PROTECTED_BRANCHES=(master origin/master PROD origin/PROD BETA origin/BETA DEV origin/DEV)

# END Config
# ---------

# 1. Find all merged branches
FIND_BRANCH_COMMAND="git for-each-ref --sort=-committerdate --format='%(objectname):%(refname:short)' refs/heads/ refs/remotes/ --merged"
for branchName in ${PROTECTED_BRANCHES[@]}; do
	FIND_BRANCH_COMMAND+=" | grep -v $branchName"
done
FOUND_BRANCHES=`eval $FIND_BRANCH_COMMAND`

# 2. Filter branches down to only those ancestors fully merged into root branch.
ANCESTORS=()
for branch in $FOUND_BRANCHES; do
    HASH="$(echo $branch | awk -F":" '{print $1}')"
    REF="$(echo $branch | awk -F":" '{print $2}')"
	if $(git merge-base --is-ancestor "$HASH" "$ROOT_HASH"); then 
		ANCESTORS+=($REF)
	fi
done

echo ${ANCESTORS[@]}