git-checkpoint -- create a new stash entry without touching working tree or index

git-checkpoint

#!/bin/sh

# git-checkpoint -- save a stash of current work in progress
# Copyright (C) 2014,2015 Kyle J. McKay.  All rights reserved.
# License GPLv2.

# Usage: git checkpoint [<stash message>]
# Optional: git config --global alias.cp checkpoint

if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
	echo "usage: git checkpoint [<stash message>]"
	exit 0
fi

# By avoiding git stash store we support Git 1.5.4 and later

# If run as "git checkpoint" then GIT_DIR would already be set,
# but just in case we're run directly, set it.
[ -n "$GIT_DIR" ] || GIT_DIR="$(git rev-parse --git-dir)" || exit 1
id="$(git stash create "$@")" || exit 1
[ -n "$id" ] || { echo "No local changes to save" >&2; exit 1; }
mkdir -p "$GIT_DIR/logs/refs" && \
>> "$GIT_DIR/logs/refs/stash" && \
git update-ref -m "$(git log -1 --pretty='format:%s' "$id")" refs/stash "$id" && \
git --no-pager log -g --pretty=oneline --abbrev-commit --no-decorate -1 stash