Display git information in PS1.

git.sh

export PS1="\n\w\$(stopped_jobs)\$(git_prefix)\$(git_prompt_info)\n\$(last_status)\$ "

# only show status when non zero
function last_status() {
    last_status="${STATUS}"
    if [ ${last_status} -gt 0 ]; then
        echo "${last_status}"
    fi
}

# get total amount of stopped jobs
function stopped_jobs() {
    job=$(jobs -s | wc -l | sed -e "s/ //g")
    if [ ${job} -gt 0 ]; then
        echo " ${job}"
    else
        echo ""
    fi
}

# only show '/ <git>' when in a git directory
function git_prefix() {
    ISGIT=$(git rev-parse --is-inside-work-tree 2>/dev/null)
    if [ ! -z ${ISGIT} ]; then
        echo " / "
    fi
}

function git_current_branch() {
    ref=$(git symbolic-ref HEAD 2>/dev/null)
    ref=${ref##refs/heads/}
    echo "$ref"
}

function git_prompt_info() {
    gitstat=$(git status 2>/dev/null)

    if [[ $(echo "${gitstat}" | grep -c "Changes not staged \| Untracked files") -gt 0 ]]; then
        GIT_CHAR="${GIT_CHAR}?"
    fi

    if [[ $(echo "${gitstat}" | grep -c "Changes to be committed") -gt 0 ]]; then
        GIT_CHAR="${GIT_CHAR}!"
    fi

    if [[ $(echo "${gitstat}" | grep -c "nothing to commit") -gt 0 ]]; then
        GIT_CHAR=""
    fi

    if [[ $(echo "${gitstat}" | grep -c "HEAD detached") -gt 0 ]]; then
        GIT_CHAR="${GIT_CHAR}%"
    fi

    if [[ "$(git_current_branch)" ]]; then
        echo "$(git_current_branch)$GIT_CHAR"
    fi
}