hg_ps1() {
    if $(hg st > /dev/null 2>&1); then 
        hg log -l1 -r. --template=' {branch}-r{rev}{if(tags," ({tags})")}{if(bookmarks," ({bookmarks})")} '
    fi
}
hg_ps2() {
    if $(hg st > /dev/null 2>&1); then
        basename $(hg root)
    fi
}

export PS1='\u@\h $(hg_ps2)$(hg_ps1)\w $ '