git.sh

# save last status
PROMPT_COMMAND='export last_status=$?'

PS1="\n\u@\H:\w\$(git_prompt)\n\$(last_status)\$ "

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

function git_prompt {
    # are we in a git repo?
    if git rev-parse --is-inside-work-tree > /dev/null 2>&1
    then
        local branch=$(git symbolic-ref --short HEAD)
        # check status only if we're not in a VM
        if ! which virt-what > /dev/null 2>&1
        then
            local stat=$(git status 2>/dev/null)
            local char=""

            if [[ $(grep -c "Changes not staged \| Untracked files" $stat) -gt 0 ]]; then
                char="$char?"
            fi

            if [[ $(grep -c "Changes to be committed" $stat) -gt 0 ]]; then
                char="$char!"
            fi

            if [[ $(grep -c "nothing to commit" $stat) -gt 0 ]]; then
                char=""
            fi

            if [[ $(grep -c "HEAD detached" $stat) -gt 0 ]]; then
                char="$char%"
            fi
        fi

        echo " $branch$char"
    fi
}