gistfile1.sh

git_branch=''
function find_git_branch {
    local dir=. head staged dirty stash
    until [ "$dir" -ef / ]; do
        if [ -f "$dir/.git/HEAD" ]; then
            git_branch=" ${red}g${green}"
            head=$(< "$dir/.git/HEAD")
            dirty=''
            git --git-dir="${dir}git" --work-tree="${dir}" diff --no-ext-diff \
                --quiet --exit-code || \
                dirty="yes"
            staged=''
            if git rev-parse --quiet --verify HEAD > /dev/null; then
                git diff-index --cached --quiet HEAD -- || \
                    staged="yes"
            fi
            stash=''
            # stash is just a file in refs/stash
            if [[ -f "$dir/.git/refs/stash" ]]; then
                stash="yes"
            fi
            if [[ $head == ref:\ refs/heads/* ]]; then
                git_branch="$git_branch ${head#*/*/}"
            elif [[ $head != '' ]]; then
                git_branch="$git_branch (detached: ${head:0:6})"
            else
                git_branch='$git_branch (unknown)'
            fi
            if [[ $staged != '' ]]; then
                git_branch="$git_branch ${yellow}s"
            fi
            if [[ $dirty != '' ]]; then
                git_branch="$git_branch ${red}d"
            fi
            if [[ $stash != '' ]]; then
                git_branch="$git_branch ${magenta}st"
            fi
            return
        fi
        dir="../$dir"
    done
    git_branch=''
}
blue=$'\e[1;34m'
magenta=$'\e[1;35m'
red=$'\e[1;31m'
normal=$'\e[m'
green=$'\e[1;32m'
yellow=$'\e[1;33m'
export PROMPT_COMMAND="find_git_branch;"
export PS1='\u@\h:\[$blue\]\w\[$green\]$git_branch\[$normal\]\n\$ '