git_rev_head

gistfile1.eclass

function git_rev_head
{
    rev_prompt_token=" » "
    rev=1
    sym=0
    declare -a colors
    declare -a branches

    branches[$rev]=$(git name-rev --name-only head 2> /dev/null)
    branches[$sym]=$(git symbolic-ref -q head 2> /dev/null)
    branches[$sym]=${branches[$sym]##refs/heads/}

    if [ ${#branches} -gt 0 ]; then
        for branch in $sym $rev; do
            case "${branches[$branch]}" in
                production*|master*) colors[$branch]=${bold}${red_text} ;;
                merge_*) colors[$branch]=${cyan_text} ;;
                *) colors[$branch]=${green_text}
            esac
        done

        sym_prompt="${colors[$sym]}${branches[$sym]}${reset}"
        rev_prompt="${colors[$rev]}${branches[$rev]}${reset}${rev_prompt_token}"
        
        if [ "${branches[$sym]}" = "${branches[$rev]}" ]; then rev_prompt=""; fi
        echo "(${rev_prompt}${sym_prompt})"
    fi
}