prompt.shlib

function ps1-root() {
    local ps1_root="\u:$(id -gn)@\h[$(arch)]:\w"

    local rev_spec=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
    if [ "${rev_spec}" == 'HEAD' ]
    then
        rev_spec=$(git describe --tags 2>/dev/null)
    fi
    if [ "${rev_spec}" == 'HEAD' -o -z "${rev_spec}" ]
    then
        rev_spec=$(git rev-parse HEAD 2>/dev/null | sed -e 's|^\([0-9a-f]\{8\}\).*|\1|')
    fi

    if [ -n "${rev_spec}" ]
    then
        ps1_root="${ps1_root}ᚴ${rev_spec}"
    fi

    echo "${ps1_root}"
}

if [ "${TERM}" = 'screen' -o "${TERM:0:5}" = 'xterm' ]
then
    function prompt-command() {
        local ps1="$(ps1-root)"
        export PS1="${ps1}> \[\e]0;${ps1}\a\]"
        export PS2="  "
    }
else
    function prompt-command() {
        local ps1="$(ps1-root)"
        export PS1="${ps1}> "
        export PS2="  "
    }
fi


export PROMPT_COMMAND="export-defs;direnv-reset-def;_direnv_hook;history -a;direnv-set-def;history -r;prompt-command"