A script to automatically stash uncommited work when one switches branch in git

switcheroo.sh

#!/usr/bin/env bash

set -o errtrace   # err traps works in functions
set -E -o errexit # exit on error
#set -o pipefail   # don't hide errors in pipes => can't use this one, it fails on grep -q
set -o nounset    # exit on undeclared variable
set -o xtrace # trace everything

IFS=$'\n' # Field separator is a new line

CURDIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

shopt -s dotglob # * include hidden files

if [ $# -ne 1 ]; then
    echo "You need to pass the branch name"
    exit 1
fi

CURRENT_BRANCH="$(git branch --show-current)"
TARGET_BRANCH="$1"
CURRENT_BRANCH_STASH_NAME="switcheroo: $CURRENT_BRANCH"
TARGET_BRANCH_STASH_NAME="switcheroo: $TARGET_BRANCH"

# Make sure the branch we switch to exists
if ! git show-ref --quiet "refs/heads/$TARGET_BRANCH"; then
    echo "Branch '$TARGET_BRANCH' cannot be found"
    exit 1
fi

# Stash the entire working copy, tag it with the current branch name
# then switch to the other branch
git stash save --include-untracked -m "$CURRENT_BRANCH_STASH_NAME"
git switch "$TARGET_BRANCH"


# If the other branch has some saved stash, restore it and delete it
if git stash list | grep -q "$TARGET_BRANCH_STASH_NAME"; then
    stash_ref=$(git stash list | grep  "$TARGET_BRANCH_STASH_NAME" | head -n 1 | cut -f1 -d":")
    git stash apply "$stash_ref"
    git stash drop "$stash_ref"
fi